Volley框架的基本使用方法

现在开发app,可以说离不开网络操作，今天给大家介绍一下Android网络框架volley的使用方法。

volley简介

Volley主页 https://android.googlesource.com/platform/frameworks/volley
Github地址 https://github.com/mcxiaoke/android-volley

Volley:2013年Google I/O大会上推出的一个新的Android网络通信框架,能使网络通信更快，更简单，更健壮。

功能:
Json,图像等的异步下载
网络请求的排序(scheduling)
网络请求的优先级处理
缓存
多级别取消请求
和Activity生命周期联动(Activity结束时同时取消所有请求)

使用volley:
compile 'com.mcxiaoke.volley:library:1.0.19'

基本使用方法

StringRequest使用方法:
演示:通过StringRequest发送一个get请求

<code class="hljs java has-numbering">    <span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">getStringRequest</span>() {
            String url=<span class="hljs-string">"http://api.k780.com:88/?app=phone.get&phone=13800138000&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json"</span>;
            RequestQueue queue= Volley.newRequestQueue(<span class="hljs-keyword">this</span>);
            StringRequest request=<span class="hljs-keyword">new</span> StringRequest(url, <span class="hljs-keyword">new</span> Response.Listener<String>() {
                <span class="hljs-annotation">@Override</span>
                <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onResponse</span>(String s) {
                    Log.e(<span class="hljs-string">"success"</span>,s);
                }
            }, <span class="hljs-keyword">new</span> Response.ErrorListener() {
                <span class="hljs-annotation">@Override</span>
                <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onErrorResponse</span>(VolleyError volleyError) {

                }
            });
            queue.add(request);
        }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li></ul>

演示:通过StringRequest发送一个post请求

<code class="hljs lasso has-numbering">     <span class="hljs-keyword">private</span> <span class="hljs-literal">void</span> postStringRequest() {
        <span class="hljs-built_in">String</span> url<span class="hljs-subst">=</span><span class="hljs-string">"http://api.k780.com:88/?app=phone.get"</span>;
        RequestQueue <span class="hljs-built_in">queue</span><span class="hljs-subst">=</span>Volley<span class="hljs-built_in">.</span>newRequestQueue(this);
        StringRequest request<span class="hljs-subst">=</span><span class="hljs-literal">new</span> StringRequest(Request<span class="hljs-built_in">.</span>Method<span class="hljs-built_in">.</span>POST, url, <span class="hljs-literal">new</span> Response<span class="hljs-built_in">.</span>Listener<span class="hljs-subst"><</span><span class="hljs-built_in">String</span><span class="hljs-subst">></span>() {
            @Override
            <span class="hljs-keyword">public</span> <span class="hljs-literal">void</span> onResponse(<span class="hljs-built_in">String</span> s) {
                <span class="hljs-keyword">Log</span><span class="hljs-built_in">.</span>e(<span class="hljs-string">"sucess"</span>,s);
            }
        }, <span class="hljs-literal">new</span> Response<span class="hljs-built_in">.</span>ErrorListener() {
            @Override
            <span class="hljs-keyword">public</span> <span class="hljs-literal">void</span> onErrorResponse(VolleyError volleyError) {

            }
        }){
            @Override
            <span class="hljs-keyword">protected</span> <span class="hljs-built_in">Map</span><span class="hljs-subst"><</span><span class="hljs-built_in">String</span>, <span class="hljs-built_in">String</span><span class="hljs-subst">></span> getParams() throws AuthFailureError {
                <span class="hljs-built_in">Map</span><span class="hljs-subst"><</span><span class="hljs-built_in">String</span>,<span class="hljs-built_in">String</span><span class="hljs-subst">></span> <span class="hljs-built_in">map</span><span class="hljs-subst">=</span><span class="hljs-literal">new</span> HashMap<span class="hljs-subst"><></span>();
                <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"phone"</span>,<span class="hljs-string">"13800138000"</span>);
                <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"appkey"</span>, <span class="hljs-string">"10003"</span>);
                <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"sign"</span>, <span class="hljs-string">"b59bc3ef6191eb9f747dd4e83c99f2a4"</span>);
                <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"format"</span>, <span class="hljs-string">"json"</span>);
                <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"idcard"</span>, <span class="hljs-string">"110101199001011114"</span>);
                <span class="hljs-keyword">return</span> <span class="hljs-built_in">map</span>;
            }
        };
        <span class="hljs-built_in">queue</span><span class="hljs-built_in">.</span>add(request);
    }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li></ul>

通过上述代码，我们可以总结出，StringRequest可以发送get和post请求，但是服务器返回的数据以String类型进行接收。
通过StringRequest发送请求一般需要以下三步：
1.创建一个请求队列RequestQueue
2.创建StringRequest对象
3.将请求对象添加到请求队列中

JsonRequest使用方法:
演示:通过JsonRequest发送一个get请求

<code class="hljs java has-numbering">     <span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">getJsonRequest</span>() {
            String url=<span class="hljs-string">"http://api.k780.com:88/?app=phone.get&phone=13800138000&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json"</span>;
            RequestQueue queue= Volley.newRequestQueue(<span class="hljs-keyword">this</span>);
            JsonObjectRequest request=<span class="hljs-keyword">new</span> JsonObjectRequest(url, <span class="hljs-keyword">new</span> Response.Listener<JSONObject>() {
                <span class="hljs-annotation">@Override</span>
                <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onResponse</span>(JSONObject jsonObject) {
                    Log.e(<span class="hljs-string">"success"</span>,jsonObject.toString());
                }
            }, <span class="hljs-keyword">new</span> Response.ErrorListener() {
                <span class="hljs-annotation">@Override</span>
                <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onErrorResponse</span>(VolleyError volleyError) {

                }
            });
            queue.add(request);
        }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li></ul>

演示:通过JsonRequest发送一个post请求

<code class="hljs lasso has-numbering">     <span class="hljs-keyword">private</span> <span class="hljs-literal">void</span> postJsonRequest() {
            <span class="hljs-built_in">String</span> url<span class="hljs-subst">=</span><span class="hljs-string">"http://api.k780.com:88/?app=phone.get"</span>;
            RequestQueue <span class="hljs-built_in">queue</span><span class="hljs-subst">=</span>Volley<span class="hljs-built_in">.</span>newRequestQueue(this);
            JsonObjectRequest request<span class="hljs-subst">=</span><span class="hljs-literal">new</span> JsonObjectRequest(Request<span class="hljs-built_in">.</span>Method<span class="hljs-built_in">.</span>POST, url, <span class="hljs-literal">new</span> Response<span class="hljs-built_in">.</span>Listener<span class="hljs-subst"><</span>JSONObject<span class="hljs-subst">></span>() {
                @Override
                <span class="hljs-keyword">public</span> <span class="hljs-literal">void</span> onResponse(JSONObject jsonObject) {
                    <span class="hljs-keyword">Log</span><span class="hljs-built_in">.</span>e(<span class="hljs-string">"success"</span>,jsonObject<span class="hljs-built_in">.</span>toString());
                }
            }, <span class="hljs-literal">new</span> Response<span class="hljs-built_in">.</span>ErrorListener() {
                @Override
                <span class="hljs-keyword">public</span> <span class="hljs-literal">void</span> onErrorResponse(VolleyError volleyError) {

                }
            }){
                @Override
                <span class="hljs-keyword">protected</span> <span class="hljs-built_in">Map</span><span class="hljs-subst"><</span><span class="hljs-built_in">String</span>, <span class="hljs-built_in">String</span><span class="hljs-subst">></span> getParams() throws AuthFailureError {
                    <span class="hljs-built_in">Map</span><span class="hljs-subst"><</span><span class="hljs-built_in">String</span>,<span class="hljs-built_in">String</span><span class="hljs-subst">></span> <span class="hljs-built_in">map</span><span class="hljs-subst">=</span><span class="hljs-literal">new</span> HashMap<span class="hljs-subst"><></span>();
                    <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"phone"</span>,<span class="hljs-string">"13800138000"</span>);
                    <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"appkey"</span>, <span class="hljs-string">"10003"</span>);
                    <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"sign"</span>, <span class="hljs-string">"b59bc3ef6191eb9f747dd4e83c99f2a4"</span>);
                    <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"format"</span>, <span class="hljs-string">"json"</span>);
                    <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"idcard"</span>, <span class="hljs-string">"110101199001011114"</span>);
                    <span class="hljs-keyword">return</span> <span class="hljs-built_in">map</span>;
                }
            };
            <span class="hljs-built_in">queue</span><span class="hljs-built_in">.</span>add(request);
        }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li></ul>

通过以上分析，可以发现，StringRequest和JsonObjectRequest用法基本一样，只是接收的数据类型不一样。
同理，JsonArrayRequest方法和上面的用法也差不多，这里不做过多介绍。

封装Volley:
具体实现功能如下:
发送get请求
发送post请求
加载网络图片
上传图片

Volley管理的类:

<code class="hljs java has-numbering"><span class="hljs-javadoc">/**
 * 管理类
 *<span class="hljs-javadoctag"> @author</span> Yan
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyVolley</span> {</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> String TAG=<span class="hljs-string">"MyVolley"</span>;
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> MyVolley instance;
    <span class="hljs-comment">//请求队列</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> RequestQueue mRequestQueue;
    <span class="hljs-comment">//创建ImageLoader</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> ImageLoader mImageLoader;
    <span class="hljs-comment">//默认分配最大空间的几分之几</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> RATE=<span class="hljs-number">8</span>;

    <span class="hljs-keyword">public</span> <span class="hljs-title">MyVolley</span>(Context context){
        <span class="hljs-comment">//初始化请求队列(默认创建5个线程)</span>
        mRequestQueue=Volley.newRequestQueue(context);
        <span class="hljs-comment">//获取ActivityManager管理者</span>
        ActivityManager manager=(ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        <span class="hljs-keyword">int</span> maxSize=manager.getMemoryClass()/RATE;
        <span class="hljs-comment">//初始化ImageLoader对象</span>
        mImageLoader=<span class="hljs-keyword">new</span> ImageLoader(mRequestQueue, <span class="hljs-keyword">new</span> BitmapLruCache(<span class="hljs-number">1024</span>*<span class="hljs-number">1024</span>*maxSize));
        Log.e(TAG, <span class="hljs-string">"MyVolley初始化完成"</span>);
    }

    <span class="hljs-javadoc">/**
     * Volley的初始化操作，使用volley前必须调用此方法
     */</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">init</span>(Context context){
        <span class="hljs-keyword">if</span>(instance==<span class="hljs-keyword">null</span>){
            instance=<span class="hljs-keyword">new</span> MyVolley(context);
        }
    }

    <span class="hljs-javadoc">/**
     * 获取消息队列
     */</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> RequestQueue <span class="hljs-title">getRequestQueue</span>(){
        throwIfNotInit();
        <span class="hljs-keyword">return</span> mRequestQueue;
    }

    <span class="hljs-javadoc">/**
     * 获取ImageLoader
     */</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> ImageLoader <span class="hljs-title">getImageLoader</span>(){
        throwIfNotInit();
        <span class="hljs-keyword">return</span> mImageLoader;
    }

    <span class="hljs-javadoc">/**
     * 加入请求队列
     */</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">addRequest</span>(Request<?> request){
        getRequestQueue().add(request);
    }

    <span class="hljs-javadoc">/**
     * 加载网络图片
     */</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">getImage</span>(String requestUrl, ImageView imageView) {
        getImage(requestUrl, imageView, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>);
    }

    <span class="hljs-javadoc">/**
     * 加载网络图片
     * 
     */</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">getImage</span>(String requestUrl, ImageView imageView,
            <span class="hljs-keyword">int</span> defaultImageResId, <span class="hljs-keyword">int</span> errorImageResId) {
        getImage(requestUrl, imageView, defaultImageResId, errorImageResId, <span class="hljs-number">0</span>,
                <span class="hljs-number">0</span>);
    }

    <span class="hljs-javadoc">/**
     * 加载网络图片
     * 
     */</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">getImage</span>(String requestUrl, ImageView imageView,
            <span class="hljs-keyword">int</span> defaultImageResId, <span class="hljs-keyword">int</span> errorImageResId, <span class="hljs-keyword">int</span> maxWidth,
            <span class="hljs-keyword">int</span> maxHeight) {
        imageView.setTag(requestUrl);
        <span class="hljs-keyword">try</span> {
            getImageLoader().get(
                    requestUrl,
                    ImageListenerFactory.getImageListener(imageView,
                            defaultImageResId, errorImageResId), maxWidth,
                            maxHeight);
        } <span class="hljs-keyword">catch</span> (Exception e) {
            e.printStackTrace();
        }
    }

    <span class="hljs-javadoc">/**
     * 检查是否完成初始化
     */</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">throwIfNotInit</span>() {
        <span class="hljs-keyword">if</span> (instance == <span class="hljs-keyword">null</span>) {
            <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> IllegalStateException(<span class="hljs-string">"MyVolley尚未初始化，在使用前应该执行init()"</span>);
        }
    }
}</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li></ul>

通过以上代码，主要提供了下面几个方法：
1.在构造方法中，初始化一个全局的请求队列RequestQueue,初始化了一个ImageLoader。
2.获取消息队列
3.获取ImageLoader对象
4.将请求加入到消息队列中
5.加载图片
注意:使用MyVolley时，一定要在应用的全局的Application中进行初始化
MyVolley.init(getApplicationContext());

加载图片中涉及到的2个缓存类如下:

<code class="hljs scala has-numbering"><span class="hljs-javadoc">/**
 * 图片缓存类(Lru算法)
 * <span class="hljs-javadoctag">@author</span> Yan
 *
 */</span>
public <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">BitmapLruCache</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">LruCache</span><<span class="hljs-title">String</span>, <span class="hljs-title">Bitmap</span>> <span class="hljs-title">implements</span> <span class="hljs-title">ImageCache</span>{</span>
    <span class="hljs-keyword">private</span> static <span class="hljs-keyword">final</span> String TAG=<span class="hljs-string">"BitmapLruCache"</span>;
    <span class="hljs-comment">//图片缓存的软引用</span>
    <span class="hljs-keyword">private</span> BitmapSoftRefCache softRefCache;

    public BitmapLruCache(int maxSize) {
        <span class="hljs-keyword">super</span>(maxSize);
        <span class="hljs-comment">//初始化BitmapSoftRefCache</span>
        softRefCache=<span class="hljs-keyword">new</span> BitmapSoftRefCache();
    }

    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> int sizeOf(String key, Bitmap value) {
        <span class="hljs-keyword">return</span> value.getRowBytes()*value.getHeight();
    }

    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> void entryRemoved(boolean evicted, String key, Bitmap oldValue,
            Bitmap newValue) {
        <span class="hljs-keyword">if</span>(evicted){
            <span class="hljs-comment">//将bitmap添加到软引用的缓存中</span>
            softRefCache.putBitmap(key, oldValue);
        }

    }

    <span class="hljs-javadoc">/**
     * 从缓存中获取图片
     */</span>
    <span class="hljs-annotation">@Override</span>
    public Bitmap getBitmap(String url) {
        Bitmap bitmap=get(url);
        <span class="hljs-keyword">if</span>(bitmap==<span class="hljs-keyword">null</span>){
            <span class="hljs-comment">//从软引用缓存中获取</span>
            bitmap=softRefCache.getBitmap(url);
        }
        <span class="hljs-keyword">return</span> bitmap;
    }

    <span class="hljs-javadoc">/**
     * 将图片放入到缓存中
     */</span>
    <span class="hljs-annotation">@Override</span>
    public void putBitmap(String url, Bitmap bitmap) {
        put(url, bitmap);
    }
}
</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li></ul>

<code class="hljs java has-numbering"><span class="hljs-javadoc">/**
 * 图片缓存管理类(软引用)
 *<span class="hljs-javadoctag"> @author</span> Yan
 *
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">BitmapSoftRefCache</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">ImageCache</span> {</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> String TAG=<span class="hljs-string">"BitmapSoftRefCache"</span>;
    <span class="hljs-comment">//创建一个集合保存Bitmap</span>
    <span class="hljs-keyword">private</span> LinkedHashMap<String,SoftReference<Bitmap>> map;

    <span class="hljs-keyword">public</span> <span class="hljs-title">BitmapSoftRefCache</span>(){
        map=<span class="hljs-keyword">new</span> LinkedHashMap<>();
    }

    <span class="hljs-javadoc">/**
     * 根据图片url从缓存中拿出bitmap
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">public</span> Bitmap <span class="hljs-title">getBitmap</span>(String url) {
        Bitmap bitmap=<span class="hljs-keyword">null</span>;
        SoftReference<Bitmap> softRef=map.get(url);
        <span class="hljs-keyword">if</span>(softRef!=<span class="hljs-keyword">null</span>){
            bitmap=softRef.get();
            <span class="hljs-keyword">if</span>(bitmap==<span class="hljs-keyword">null</span>){
                <span class="hljs-comment">//从集合中移除</span>
                map.remove(url);
            }
        }
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">null</span>;
    }

    <span class="hljs-javadoc">/**
     * 把图片放进缓存中
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">putBitmap</span>(String url, Bitmap bitmap) {
        SoftReference<Bitmap> softRef=<span class="hljs-keyword">new</span> SoftReference<Bitmap>(bitmap);
        map.put(url, softRef);
    }

}
</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li></ul>

<code class="hljs java has-numbering"><span class="hljs-javadoc">/**
 * 图片加载状态监听
 *<span class="hljs-javadoctag"> @author</span> Yan
 *
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ImageListenerFactory</span> {</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> String TAG=<span class="hljs-string">"ImageListenerFactory"</span>;

    <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> ImageListener <span class="hljs-title">getImageListener</span>(<span class="hljs-keyword">final</span> ImageView view,
            <span class="hljs-keyword">final</span> <span class="hljs-keyword">int</span> defaultImageResId, <span class="hljs-keyword">final</span> <span class="hljs-keyword">int</span> errorImageResId){
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> ImageListener() {

            <span class="hljs-annotation">@Override</span>
            <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onErrorResponse</span>(VolleyError error) {
                <span class="hljs-keyword">if</span>(errorImageResId!=<span class="hljs-number">0</span>){
                    view.setImageResource(errorImageResId);
                }
            }

            <span class="hljs-annotation">@Override</span>
            <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onResponse</span>(ImageContainer response, <span class="hljs-keyword">boolean</span> isImmediate) {
                <span class="hljs-keyword">if</span>(response.getBitmap()!=<span class="hljs-keyword">null</span>){
                    <span class="hljs-keyword">if</span>(view.getTag().toString().equals(response.getRequestUrl())){
                        view.setImageBitmap(response.getBitmap());
                    }
                }
                <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span>(defaultImageResId!=<span class="hljs-number">0</span>){
                    view.setImageResource(defaultImageResId);
                }
            }
        };
    }
}</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li></ul>

这里加载图片采用了LRU算法，然后配合软引用使用，这样会更好的对内存进行管理，代码中注释已经很详细，相信大家都可以理解。

<code class="hljs axapta has-numbering"><span class="hljs-comment">/**
 * 返回成功监听(自定义处理逻辑)
 * @author Yan
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyReponseListener</span> <span class="hljs-inheritance"><span class="hljs-keyword">implements</span></span> <span class="hljs-title">Response</span>.<span class="hljs-title">Listener</span><<span class="hljs-title">BaseVO</span>> {</span>
    @Override
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> onResponse(BaseVO arg0) {
        onMyResponse(arg0);
    }

    <span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> onMyResponse(BaseVO t) {
        <span class="hljs-comment">//      DialogMaker.closeProgressDialog();</span>
        <span class="hljs-comment">// 自定义处理逻辑</span>
        ...
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
    }
}
</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li></ul>

<code class="hljs java has-numbering"><span class="hljs-javadoc">/**
 * 自定义返回错误信息监听
 * 
 *<span class="hljs-javadoctag"> @author</span> Yan
 * 
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyErrorListener</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">ErrorListener</span> {</span>

    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onErrorResponse</span>(VolleyError error) {
        <span class="hljs-comment">//自定义同意错误逻辑处理</span>
        ...
    }
}</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li></ul>

下面提供一个请求服务器返回数据后封装成对象的一个GsonRequest:

<code class="hljs scala has-numbering">public <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">GsonRequest</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Request</span><<span class="hljs-title">BaseVO</span>>{</span>
    <span class="hljs-keyword">private</span> static <span class="hljs-keyword">final</span> String TAG=<span class="hljs-string">"GsonRequest"</span>;
    <span class="hljs-comment">//超时时间，默认10秒</span>
    <span class="hljs-keyword">private</span> int defaultHttpTimeOut=<span class="hljs-number">10</span>*<span class="hljs-number">1000</span>;
    <span class="hljs-comment">//回调监听</span>
    <span class="hljs-keyword">private</span> Listener<BaseVO> listener;
    <span class="hljs-comment">//返回类型</span>
    <span class="hljs-keyword">private</span> Type <span class="hljs-keyword">type</span>;
    <span class="hljs-comment">//请求参数</span>
    <span class="hljs-keyword">private</span> Map<String,String> methodBody; 

    <span class="hljs-javadoc">/**
     * get请求
     * 
     * <span class="hljs-javadoctag">@param</span> url
     * <span class="hljs-javadoctag">@param</span> type
     * <span class="hljs-javadoctag">@param</span> listener
     * <span class="hljs-javadoctag">@param</span> errorListener
     */</span>
    public GsonRequest(String url, Type <span class="hljs-keyword">type</span>, Listener<BaseVO> listener,
            ErrorListener errorListener) {
        <span class="hljs-keyword">super</span>(Method.GET, url, errorListener);
        <span class="hljs-comment">// 不启用缓存(默认是true)</span>
        setShouldCache(<span class="hljs-keyword">false</span>);
        <span class="hljs-keyword">this</span>.<span class="hljs-keyword">type</span> = <span class="hljs-keyword">type</span>;
        <span class="hljs-keyword">this</span>.listener = listener;
        <span class="hljs-comment">// 设置重连策略</span>
        <span class="hljs-keyword">this</span>.setRetryPolicy(<span class="hljs-keyword">new</span> DefaultRetryPolicy(defaultHttpTimeOut,
                DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    }


    <span class="hljs-javadoc">/**
     * post请求
     * 
     * <span class="hljs-javadoctag">@param</span> methodName
     * <span class="hljs-javadoctag">@param</span> methodBoby
     * <span class="hljs-javadoctag">@param</span> type
     * <span class="hljs-javadoctag">@param</span> listener
     * <span class="hljs-javadoctag">@param</span> errorListener
     */</span>
    public GsonRequest(String url, Map<String, String> methodBoby, Type <span class="hljs-keyword">type</span>,
            Listener<BaseVO> listener, ErrorListener errorListener) {
        <span class="hljs-keyword">super</span>(Method.POST, url, errorListener);
        <span class="hljs-keyword">this</span>.methodBody = methodBoby;
        <span class="hljs-keyword">this</span>.listener = listener;
        <span class="hljs-keyword">this</span>.<span class="hljs-keyword">type</span> = <span class="hljs-keyword">type</span>;
        <span class="hljs-comment">// 不启用缓存</span>
        setShouldCache(<span class="hljs-keyword">false</span>);
        <span class="hljs-comment">// 设置重连策略</span>
        <span class="hljs-keyword">this</span>.setRetryPolicy(<span class="hljs-keyword">new</span> DefaultRetryPolicy(defaultHttpTimeOut,
                DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    }

    <span class="hljs-javadoc">/**
     * 设置请求参数
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> Map<String, String> getParams() <span class="hljs-keyword">throws</span> AuthFailureError {
        <span class="hljs-keyword">if</span>(methodBody==<span class="hljs-keyword">null</span>){
            <span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.getParams();
        }
        <span class="hljs-comment">//创建一个集合，保存请求参数</span>
        Map<String,String> map=<span class="hljs-keyword">new</span> LinkedHashMap<>();
        <span class="hljs-comment">//----此处可以添加多个通用参数</span>
        <span class="hljs-comment">//map.put(key,value);</span>
        <span class="hljs-comment">//------</span>
        <span class="hljs-comment">//------</span>
        <span class="hljs-comment">//遍历集合</span>
        Iterator<Entry<String,String>> iter=methodBody.entrySet().iterator();
        <span class="hljs-keyword">while</span>(iter.hasNext()){
            Entry<String, String> entry=iter.next();
            map.put(entry.getKey(), entry.getValue());
        }
        <span class="hljs-keyword">return</span> map;
    }

    <span class="hljs-javadoc">/**
     * 将服务器返回的原生字节内容进行转换
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> Response<BaseVO> parseNetworkResponse(NetworkResponse response) {
        <span class="hljs-keyword">try</span> {
            <span class="hljs-comment">// 获取返回的数据(在 Content-Type首部中获取编码集，如果没有找到，默认返回 ISO-8859-1)</span>
            String jsonString = <span class="hljs-keyword">new</span> String(response.data,
                    HttpHeaderParser.parseCharset(response.headers));
            <span class="hljs-keyword">return</span> Response.success(parseNetworkResponseDelegate(jsonString),
                    HttpHeaderParser.parseCacheHeaders(response));
        } <span class="hljs-keyword">catch</span> (Exception e) {
            <span class="hljs-keyword">return</span> Response.error(<span class="hljs-keyword">new</span> ParseError(e));
        }
    }

    <span class="hljs-javadoc">/**
     * 将服务器返回的内容用gson进行封装
     */</span>
    <span class="hljs-keyword">private</span> BaseVO parseNetworkResponseDelegate(String jsonString) {
            <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> Gson().fromJson(jsonString, <span class="hljs-keyword">type</span>);
    }

    <span class="hljs-javadoc">/**
     * 将解析后的数据进行回调
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> void deliverResponse(BaseVO arg0) {
        listener.onResponse(arg0);
    }
}</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li><li>103</li><li>104</li><li>105</li><li>106</li><li>107</li><li>108</li><li>109</li><li>110</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li><li>103</li><li>104</li><li>105</li><li>106</li><li>107</li><li>108</li><li>109</li><li>110</li></ul>

下面提供一个请求服务器返回XML格式数据后的一个XMLRequest:

<code class="hljs scala has-numbering">**
 * 服务器以XML格式返回数据
 * <span class="hljs-annotation">@author</span> Yan
 */
public <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">XMLRequest</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Request</span><<span class="hljs-title">XmlPullParser</span>>{</span>
    <span class="hljs-keyword">private</span> Listener<XmlPullParser> mListener;

    public XMLRequest(int method, String url, Listener<XmlPullParser> listener,
            ErrorListener errorListener){
        <span class="hljs-keyword">super</span>(method, url, errorListener);
        <span class="hljs-comment">//不启用缓存</span>
        setShouldCache(<span class="hljs-keyword">false</span>);
        mListener=listener;
    }

    public XMLRequest(String url, Listener<XmlPullParser> listener, ErrorListener errorListener) {
        <span class="hljs-keyword">this</span>(Method.GET, url, listener, errorListener);
    }


    <span class="hljs-javadoc">/**
     * 解析服务器返回的数据
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> Response<XmlPullParser> parseNetworkResponse(
            NetworkResponse response) {
        <span class="hljs-keyword">try</span> {  
            String xmlString = <span class="hljs-keyword">new</span> String(response.data,  
                    HttpHeaderParser.parseCharset(response.headers));  
            <span class="hljs-comment">//创建解析工厂</span>
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();  
            <span class="hljs-comment">//获取解析器</span>
            XmlPullParser xmlPullParser = factory.newPullParser();  
            <span class="hljs-comment">//设置解析数据</span>
            xmlPullParser.setInput(<span class="hljs-keyword">new</span> StringReader(xmlString));  
            <span class="hljs-keyword">return</span> Response.success(xmlPullParser, HttpHeaderParser.parseCacheHeaders(response));  
        } <span class="hljs-keyword">catch</span> (UnsupportedEncodingException e) {  
            <span class="hljs-keyword">return</span> Response.error(<span class="hljs-keyword">new</span> ParseError(e));  
        } <span class="hljs-keyword">catch</span> (XmlPullParserException e) {  
            <span class="hljs-keyword">return</span> Response.error(<span class="hljs-keyword">new</span> ParseError(e));  
        }  
    }

    <span class="hljs-javadoc">/**
     * 分发结果
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> void deliverResponse(XmlPullParser response) {
        mListener.onResponse(response);
    }
}
</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li></ul>

下面提供一个文件上传(支持多文件)的一个PostUploadRequest:

<code class="hljs scala has-numbering">public <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">PostUploadRequest</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Request</span><<span class="hljs-title">String</span>>{</span>
       <span class="hljs-javadoc">/**
     * 正确数据的时候回掉用
     */</span>
    <span class="hljs-keyword">private</span> Listener mListener ;
    <span class="hljs-comment">/*请求 数据通过参数的形式传入*/</span>
    <span class="hljs-keyword">private</span> List<FormImage> mListItem ;

    <span class="hljs-keyword">private</span> String BOUNDARY = <span class="hljs-string">"--------------520-13-14"</span>; <span class="hljs-comment">//数据分隔线</span>
    <span class="hljs-keyword">private</span> String MULTIPART_FORM_DATA = <span class="hljs-string">"multipart/form-data"</span>;

    public PostUploadRequest(String url, List<FormImage> listItem, Listener<String> listener,
            ErrorListener errorListener) {
        <span class="hljs-keyword">super</span>(Method.POST, url, errorListener);
        <span class="hljs-keyword">this</span>.mListener = listener ;
        setShouldCache(<span class="hljs-keyword">false</span>);
        mListItem = listItem ;
        <span class="hljs-comment">//设置请求的响应事件，因为文件上传需要较长的时间，所以在这里加大了，设为10秒</span>
        setRetryPolicy(<span class="hljs-keyword">new</span> DefaultRetryPolicy(<span class="hljs-number">10</span>*<span class="hljs-number">1000</span>,DefaultRetryPolicy.DEFAULT_MAX_RETRIES,DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    }

    <span class="hljs-javadoc">/**
     * 这里开始解析数据
     * <span class="hljs-javadoctag">@param</span> response Response from the network
     * <span class="hljs-javadoctag">@return</span>
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> Response<String> parseNetworkResponse(NetworkResponse response) {
        <span class="hljs-keyword">try</span> {
            String mString =
                    <span class="hljs-keyword">new</span> String(response.data, HttpHeaderParser.parseCharset(response.headers));
            <span class="hljs-keyword">return</span> Response.success(mString,
                    HttpHeaderParser.parseCacheHeaders(response));
        } <span class="hljs-keyword">catch</span> (UnsupportedEncodingException e) {
            <span class="hljs-keyword">return</span> Response.error(<span class="hljs-keyword">new</span> ParseError(e));
        }
    }

    <span class="hljs-javadoc">/**
     * 回调正确的数据
     * <span class="hljs-javadoctag">@param</span> response The parsed response returned by
     */</span>
    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">protected</span> void deliverResponse(String response) {
        mListener.onResponse(response);
    }

    <span class="hljs-annotation">@Override</span>
    public byte[] getBody() <span class="hljs-keyword">throws</span> AuthFailureError {
        <span class="hljs-keyword">if</span> (mListItem == <span class="hljs-keyword">null</span>||mListItem.size() == <span class="hljs-number">0</span>){
            <span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.getBody() ;
        }
        ByteArrayOutputStream bos = <span class="hljs-keyword">new</span> ByteArrayOutputStream() ;
        int N = mListItem.size() ;
        <span class="hljs-keyword">for</span> (int i = <span class="hljs-number">0</span>; i < N ;i++){
            FormImage formImage = mListItem.get(i) ;
            StringBuffer sb= <span class="hljs-keyword">new</span> StringBuffer() ;
            <span class="hljs-comment">/*第一行*/</span>
            <span class="hljs-comment">//`"--" + BOUNDARY + "\r\n"`</span>
            sb.append(<span class="hljs-string">"--"</span>+BOUNDARY);
            sb.append(<span class="hljs-string">"\r\n"</span>) ;
            <span class="hljs-comment">/*第二行*/</span>
            <span class="hljs-comment">//Content-Disposition: form-data; name="参数的名称"; filename="上传的文件名" + "\r\n"</span>
            sb.append(<span class="hljs-string">"Content-Disposition: form-data;"</span>);
            sb.append(<span class="hljs-string">" name=\""</span>);
            sb.append(formImage.getName()) ;
            sb.append(<span class="hljs-string">"\""</span>) ;
            sb.append(<span class="hljs-string">"; filename=\""</span>) ;
            sb.append(formImage.getFileName()) ;
            sb.append(<span class="hljs-string">"\""</span>);
            sb.append(<span class="hljs-string">"\r\n"</span>) ;
            <span class="hljs-comment">/*第三行*/</span>
            <span class="hljs-comment">//Content-Type: 文件的 mime 类型 + "\r\n"</span>
            sb.append(<span class="hljs-string">"Content-Type: "</span>);
            sb.append(formImage.getMime()) ;
            sb.append(<span class="hljs-string">"\r\n"</span>) ;
            <span class="hljs-comment">/*第四行*/</span>
            <span class="hljs-comment">//"\r\n"</span>
            sb.append(<span class="hljs-string">"\r\n"</span>) ;
            <span class="hljs-keyword">try</span> {
                bos.write(sb.toString().getBytes(<span class="hljs-string">"utf-8"</span>));
                <span class="hljs-comment">/*第五行*/</span>
                <span class="hljs-comment">//文件的二进制数据 + "\r\n"</span>
                bos.write(formImage.getValue());
                bos.write(<span class="hljs-string">"\r\n"</span>.getBytes(<span class="hljs-string">"utf-8"</span>));
            } <span class="hljs-keyword">catch</span> (IOException e) {
                e.printStackTrace();
            }

        }
        <span class="hljs-comment">/*结尾行*/</span>
        <span class="hljs-comment">//`"--" + BOUNDARY + "--" + "\r\n"`</span>
        String endLine = <span class="hljs-string">"--"</span> + BOUNDARY + <span class="hljs-string">"--"</span> + <span class="hljs-string">"\r\n"</span> ;
        <span class="hljs-keyword">try</span> {
            bos.write(endLine.toString().getBytes(<span class="hljs-string">"utf-8"</span>));
        } <span class="hljs-keyword">catch</span> (IOException e) {
            e.printStackTrace();
        }
        <span class="hljs-keyword">return</span> bos.toByteArray();
    }
    <span class="hljs-comment">//Content-Type: multipart/form-data; boundary=----------8888888888888</span>
    <span class="hljs-annotation">@Override</span>
    public String getBodyContentType() {
        <span class="hljs-keyword">return</span> MULTIPART_FORM_DATA+<span class="hljs-string">"; boundary="</span>+BOUNDARY;
    }
}</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li><li>103</li><li>104</li><li>105</li><li>106</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li><li>67</li><li>68</li><li>69</li><li>70</li><li>71</li><li>72</li><li>73</li><li>74</li><li>75</li><li>76</li><li>77</li><li>78</li><li>79</li><li>80</li><li>81</li><li>82</li><li>83</li><li>84</li><li>85</li><li>86</li><li>87</li><li>88</li><li>89</li><li>90</li><li>91</li><li>92</li><li>93</li><li>94</li><li>95</li><li>96</li><li>97</li><li>98</li><li>99</li><li>100</li><li>101</li><li>102</li><li>103</li><li>104</li><li>105</li><li>106</li></ul>

上传文件的FormImage类如下:

<code class="hljs cs has-numbering"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> FormImage {
    <span class="hljs-comment">//参数的名称</span>
    <span class="hljs-keyword">private</span> String name ;
    <span class="hljs-comment">//文件名</span>
    <span class="hljs-keyword">private</span> String fileName ;
    <span class="hljs-comment">//文件的mine</span>
    <span class="hljs-keyword">private</span> String mime ;
    <span class="hljs-comment">//需要上传的文件</span>
    <span class="hljs-keyword">private</span> File file ;

    <span class="hljs-keyword">public</span> <span class="hljs-title">FormImage</span>() {
    }

    <span class="hljs-keyword">public</span> File <span class="hljs-title">getFile</span>() {
        <span class="hljs-keyword">return</span> file;
    }

    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setFile</span>(File file) {
        <span class="hljs-keyword">this</span>.file = file;
    }

    <span class="hljs-keyword">public</span> String <span class="hljs-title">getMime</span>() {
        <span class="hljs-keyword">return</span> mime;
    }

    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setMime</span>(String mime) {
        <span class="hljs-keyword">this</span>.mime = mime;
    }

    <span class="hljs-keyword">public</span> String <span class="hljs-title">getFileName</span>() {
        <span class="hljs-keyword">return</span> fileName;
    }

    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setFileName</span>(String fileName) {
        <span class="hljs-keyword">this</span>.fileName = fileName;
    }

    <span class="hljs-keyword">public</span> String <span class="hljs-title">getName</span>() {
        <span class="hljs-keyword">return</span> name;
    }

    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setName</span>(String name) {
        <span class="hljs-keyword">this</span>.name = name;
    }

    <span class="hljs-comment">//对文件进行二进制转换</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">byte</span>[] <span class="hljs-title">getValue</span>() {
        <span class="hljs-keyword">byte</span>[] buffer = <span class="hljs-keyword">null</span>;
        <span class="hljs-keyword">try</span> {
            FileInputStream fis = <span class="hljs-keyword">new</span> FileInputStream(file);
            ByteArrayOutputStream bos = <span class="hljs-keyword">new</span> ByteArrayOutputStream(<span class="hljs-number">1024</span>);
            <span class="hljs-keyword">byte</span>[] b = <span class="hljs-keyword">new</span> <span class="hljs-keyword">byte</span>[<span class="hljs-number">1024</span>];
            <span class="hljs-keyword">int</span> n;
            <span class="hljs-keyword">while</span> ((n = fis.read(b)) != -<span class="hljs-number">1</span>) {
                bos.write(b, <span class="hljs-number">0</span>, n);
            }
            fis.close();
            bos.close();
            buffer = bos.toByteArray();
        } <span class="hljs-keyword">catch</span> (FileNotFoundException e) {
            e.printStackTrace();
        } <span class="hljs-keyword">catch</span> (IOException e) {
            e.printStackTrace();
        }
        <span class="hljs-keyword">return</span> buffer;
    }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li><li>62</li><li>63</li><li>64</li><li>65</li><li>66</li></ul>

下面演示如何使用封装后的方法进行网络请求:
1.发送get请求:

<code class="hljs java has-numbering"> <span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">getMyVolley</span>() {
        String url=<span class="hljs-string">"http://api.k780.com:88/?app=idcard.get&idcard=110101199001011114&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json"</span>;
        GsonRequest request=<span class="hljs-keyword">new</span> GsonRequest(url, PersonInfoBean.class, <span class="hljs-keyword">new</span> MyReponseListener() {

            <span class="hljs-annotation">@Override</span>
            <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onResponse</span>(BaseVO t) {
                <span class="hljs-keyword">super</span>.onResponse(t);
                PersonInfoBean bean=(PersonInfoBean) t;
                Log.e(<span class="hljs-string">"success"</span>, bean.toString());
            }

        }, <span class="hljs-keyword">new</span> MyErrorListener() {

            <span class="hljs-annotation">@Override</span>
            <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onErrorResponse</span>(VolleyError error) {
                <span class="hljs-keyword">super</span>.onErrorResponse(error);
            }

        });
        MyVolley.addRequest(request);
    }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li></ul>

2.发送post请求:

<code class="hljs lasso has-numbering"><span class="hljs-keyword">private</span> <span class="hljs-literal">void</span> postMyVolley() {
        <span class="hljs-built_in">String</span> url<span class="hljs-subst">=</span><span class="hljs-string">"http://api.k780.com:88/?app=idcard.get"</span>;
        <span class="hljs-built_in">Map</span><span class="hljs-subst"><</span><span class="hljs-built_in">String</span>,<span class="hljs-built_in">String</span><span class="hljs-subst">></span> <span class="hljs-built_in">map</span><span class="hljs-subst">=</span><span class="hljs-literal">new</span> HashMap<span class="hljs-subst"><></span>();
        <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"appkey"</span>, <span class="hljs-string">"10003"</span>);
        <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"sign"</span>, <span class="hljs-string">"b59bc3ef6191eb9f747dd4e83c99f2a4"</span>);
        <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"format"</span>, <span class="hljs-string">"json"</span>);
        <span class="hljs-built_in">map</span><span class="hljs-built_in">.</span>put(<span class="hljs-string">"idcard"</span>, <span class="hljs-string">"110101199001011114"</span>);
        GsonRequest request<span class="hljs-subst">=</span><span class="hljs-literal">new</span> GsonRequest(url, <span class="hljs-built_in">map</span>, PersonInfoBean<span class="hljs-built_in">.</span>class, <span class="hljs-literal">new</span> MyReponseListener() {

            @Override
            <span class="hljs-keyword">public</span> <span class="hljs-literal">void</span> onResponse(BaseVO vo) {
                super<span class="hljs-built_in">.</span>onResponse(vo);
                PersonInfoBean bean<span class="hljs-subst">=</span>(PersonInfoBean) vo;
                <span class="hljs-keyword">Log</span><span class="hljs-built_in">.</span>e(<span class="hljs-string">"sucess"</span>, bean<span class="hljs-built_in">.</span>toString());
            }

        }, <span class="hljs-literal">new</span> MyErrorListener() {

            @Override
            <span class="hljs-keyword">public</span> <span class="hljs-literal">void</span> onErrorResponse(VolleyError error) {
                super<span class="hljs-built_in">.</span>onErrorResponse(error);
            }

        });
        MyVolley<span class="hljs-built_in">.</span>addRequest(request);
    }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li></ul>

3.上传多文件演示:

<code class="hljs lasso has-numbering">  <span class="hljs-comment">//上传文件路径</span>
        <span class="hljs-built_in">String</span> url<span class="hljs-subst">=</span><span class="hljs-string">"http://192.168.1.107:8080/FileUpload/FileServlet"</span>;
        <span class="hljs-built_in">List</span><span class="hljs-subst"><</span>FormImage<span class="hljs-subst">></span> <span class="hljs-built_in">list</span><span class="hljs-subst">=</span><span class="hljs-literal">new</span> ArrayList<span class="hljs-subst"><></span>();
        <span class="hljs-built_in">String</span> path1<span class="hljs-subst">=</span> Environment<span class="hljs-built_in">.</span>getExternalStorageDirectory()<span class="hljs-built_in">.</span>getPath()<span class="hljs-subst">+</span>File<span class="hljs-built_in">.</span>separator<span class="hljs-subst">+</span><span class="hljs-string">"ss.png"</span>;
        <span class="hljs-built_in">String</span> path2<span class="hljs-subst">=</span> Environment<span class="hljs-built_in">.</span>getExternalStorageDirectory()<span class="hljs-built_in">.</span>getPath()<span class="hljs-subst">+</span>File<span class="hljs-built_in">.</span>separator<span class="hljs-subst">+</span><span class="hljs-string">"ic_launcher.png"</span>;
        File file1<span class="hljs-subst">=</span><span class="hljs-literal">new</span> File(path1);
        File file2<span class="hljs-subst">=</span><span class="hljs-literal">new</span> File(path2);

        FormImage f1<span class="hljs-subst">=</span><span class="hljs-literal">new</span> FormImage();
        f1<span class="hljs-built_in">.</span>setFile(file1);
        f1<span class="hljs-built_in">.</span>setFileName(<span class="hljs-string">"t1"</span>);
        f1<span class="hljs-built_in">.</span>setName(<span class="hljs-string">"file1"</span>);
        f1<span class="hljs-built_in">.</span>setMime(<span class="hljs-string">"image/png"</span>);
        <span class="hljs-built_in">list</span><span class="hljs-built_in">.</span>add(f1);

        FormImage f2<span class="hljs-subst">=</span><span class="hljs-literal">new</span> FormImage();
        f2<span class="hljs-built_in">.</span>setFile(file2);
        f2<span class="hljs-built_in">.</span>setFileName(<span class="hljs-string">"t2"</span>);
        f2<span class="hljs-built_in">.</span>setName(<span class="hljs-string">"file2"</span>);
        f2<span class="hljs-built_in">.</span>setMime(<span class="hljs-string">"image/png"</span>);
        <span class="hljs-built_in">list</span><span class="hljs-built_in">.</span>add(f2);


        PostUploadRequest request<span class="hljs-subst">=</span><span class="hljs-literal">new</span> PostUploadRequest(url, <span class="hljs-built_in">list</span>, <span class="hljs-literal">new</span> Response<span class="hljs-built_in">.</span>Listener<span class="hljs-subst"><</span><span class="hljs-built_in">String</span><span class="hljs-subst">></span>() {
            @Override
            <span class="hljs-keyword">public</span> <span class="hljs-literal">void</span> onResponse(<span class="hljs-built_in">String</span> s) {
                <span class="hljs-keyword">Log</span><span class="hljs-built_in">.</span>e(<span class="hljs-string">"success"</span>,s);
            }
        }, <span class="hljs-literal">new</span> Response<span class="hljs-built_in">.</span>ErrorListener() {
            @Override
            <span class="hljs-keyword">public</span> <span class="hljs-literal">void</span> onErrorResponse(VolleyError volleyError) {

            }
        });
        MyVolley<span class="hljs-built_in">.</span>addRequest(request);
    }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li></ul>

4.发送请求，服务器返回XML:

<code class="hljs java has-numbering"><span class="hljs-keyword">private</span> <span class="hljs-keyword">void</span> <span class="hljs-title">getXml</span>() {
        String url=<span class="hljs-string">"http://flash.weather.com.cn/wmaps/xml/china.xml"</span>;
        XMLRequest request=<span class="hljs-keyword">new</span> XMLRequest( url, <span class="hljs-keyword">new</span> Response.Listener<XmlPullParser>() {
            <span class="hljs-annotation">@Override</span>
            <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onResponse</span>(XmlPullParser xmlPullParser) {
                <span class="hljs-keyword">try</span> {
                    <span class="hljs-keyword">int</span> eventType = xmlPullParser.getEventType();
                    <span class="hljs-keyword">while</span> (eventType != XmlPullParser.END_DOCUMENT) {
                        <span class="hljs-keyword">switch</span> (eventType) {
                            <span class="hljs-keyword">case</span> XmlPullParser.START_TAG:
                                String nodeName = xmlPullParser.getName();
                                <span class="hljs-keyword">if</span> (<span class="hljs-string">"city"</span>.equals(nodeName)) {
                                    String pName = xmlPullParser.getAttributeValue(<span class="hljs-number">0</span>);
                                    Log.e(<span class="hljs-string">"TAG"</span>, <span class="hljs-string">"city is "</span> + pName);
                                }
                                <span class="hljs-keyword">break</span>;
                        }
                        eventType = xmlPullParser.next();
                    }
                }<span class="hljs-keyword">catch</span>(Exception e){
                    e.printStackTrace();
                }
            }
        }, <span class="hljs-keyword">new</span> Response.ErrorListener() {
            <span class="hljs-annotation">@Override</span>
            <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onErrorResponse</span>(VolleyError volleyError) {

            }
        });
        MyVolley.addRequest(request);
    }</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li></ul>

4.利用ImageLoader加载图片:

<code class="hljs java has-numbering"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyAdapter</span> <span class="hljs-keyword">extends</span>  <span class="hljs-title">BaseAdapter</span>{</span>
    <span class="hljs-keyword">private</span> Context context;
    <span class="hljs-keyword">private</span> List<Person> list;
    <span class="hljs-keyword">private</span> LayoutInflater mInflater;
    <span class="hljs-keyword">public</span> ViewHolder holder;
    <span class="hljs-keyword">public</span> <span class="hljs-title">MyAdapter</span>(Context context, List<Person> list) {
        <span class="hljs-keyword">this</span>.context = context;
        <span class="hljs-keyword">this</span>.list = list;
        <span class="hljs-keyword">this</span>.mInflater=LayoutInflater.from(context);
    }

    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">int</span> <span class="hljs-title">getCount</span>() {
        <span class="hljs-keyword">return</span> list.size();
    }

    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">public</span> Object <span class="hljs-title">getItem</span>(<span class="hljs-keyword">int</span> position) {
        <span class="hljs-keyword">return</span> list.get(position);
    }

    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">public</span> <span class="hljs-keyword">long</span> <span class="hljs-title">getItemId</span>(<span class="hljs-keyword">int</span> position) {
        <span class="hljs-keyword">return</span> position;
    }

    <span class="hljs-annotation">@Override</span>
    <span class="hljs-keyword">public</span> View <span class="hljs-title">getView</span>(<span class="hljs-keyword">int</span> position, View convertView, ViewGroup parent) {
        holder=<span class="hljs-keyword">null</span>;
        <span class="hljs-keyword">if</span>(convertView==<span class="hljs-keyword">null</span>){
            convertView=mInflater.inflate(R.layout.itemone, <span class="hljs-keyword">null</span>);
            holder=<span class="hljs-keyword">new</span> ViewHolder();
            holder.iv_image=(ImageView) convertView.findViewById(R.id.iv_image);
            holder.tv_name=(TextView) convertView.findViewById(R.id.tv_name);
            convertView.setTag(holder);
        }
        <span class="hljs-keyword">else</span>{
            holder=(ViewHolder) convertView.getTag();
        }
        Person bean=list.get(position);
        holder.tv_name.setText(bean.getName());
        MyVolley.getImage(bean.getImgUrl(), holder.iv_image, R.mipmap.ic_launcher, R.mipmap.ic_launcher,<span class="hljs-number">150</span>,<span class="hljs-number">150</span>);
        <span class="hljs-keyword">return</span> convertView;
    }

    class ViewHolder{
        <span class="hljs-keyword">private</span> TextView tv_name;
        <span class="hljs-keyword">private</span> ImageView iv_image;
    }
}</code><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li></ul><ul class="pre-numbering" style=""><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li></ul>

上面主要介绍了如何封装Volley，并且如何使用封装后的MyVolley进行网络请求。
演示：

今天说了这么多，相信大家一定对Volley可以达到基本掌握的情况了，本篇文章主要是从实战角度出发，主要是让大家体验一下volley的框架封装的用法，volley的源码本篇文章没有涉及到，但是这完全不影响大家使用volley，后续有时间我会从源码角度进行分析volley，说了这么多，有点饿了，今天就说到这里了，大家快快练习一下Volley的操作吧~!

VolleyDemo.zip