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最新推荐文章于 2025-08-22 08:41:08 发布

转载最新推荐文章于 2025-08-22 08:41:08 发布 · 158 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/johnny901114/archive/2012/02/07/2340789.html

文章标签：

#移动开发 #web.xml #java

本文介绍了Android应用中SplashActivity的实现方式，包括版本检查、更新提示及后台下载等功能，并展示了如何通过Handler机制实现在子线程中更新UI。

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Splash和应用程序的升级和显示主界面

　　新建第一个类Splash.java

首先说一下Splash.java类的作用,一般来说一个android应用都应该有一个这样的类,这个类的有如下作用:

1.数据库的下载和创建

2.检测服务器上最新的版本信息.

3.根据不同的日期时间展现不同的logo.

4.检测用户的手机网络.

下面这个类有体现:

  1     // 连接服务器失败
  2     public static final int CONNECT_SERVER_ERROR = 10;
  3     // 显示提示信息
  4     public static final int SHOW_UPDATE_DIALOG = 11;
  5     // 下载失败
  6     public static final int DOWNLOAD_ERROR = 12;
  7     // 下载成功
  8     public static final int DOWNLOAD_SUCCESS = 13;
  9     public static final String TAG = "SplashActivity";
 10 
 11     UpdateInfo info;
 12     String version;
 13     ProgressDialog pd;
 14 
 15     //使用Handler和message更新界面
 16     private Handler handler = new Handler() {
 17         @Override
 18         public void handleMessage(Message msg) {
 19             super.handleMessage(msg);
 20             switch (msg.what) {
 21             case CONNECT_SERVER_ERROR:
 22                 Toast.makeText(SplashActivity.this, "连接服务器异常", 1).show();
 23                 Log.i(TAG, "进入程序主界面 ");
 24                 LoadMainUI();
 25                 break;
 26             case SHOW_UPDATE_DIALOG:
 27                 AlertDialog.Builder builder = new Builder(SplashActivity.this);
 28                 builder.setTitle("升级提醒");
 29                 builder.setMessage(info.getDescription());
 30                 
 31                 builder.setPositiveButton("是", new OnClickListener() {
 32                     public void onClick(DialogInterface dialog, int which) {
 33                         Log.i(TAG, "根据info对象里面的url下载最新的apk");
 34                         String apkpath = info.getUrl();
 35                         // DownLoadFileService.downLoad(apkpath);
 36                         pd.setMessage("正在下载更新");
 37                         pd.show();
 38                         new Thread(new DownLoadFileTask(apkpath)).start();
 39                     }
 40                 });
 41                 builder.setNegativeButton("否", new OnClickListener() {
 42 
 43                     public void onClick(DialogInterface dialog, int which) {
 44                         Log.i(TAG, "什么事情也不做进入程序主界面 ");
 45                         LoadMainUI();
 46                     }
 47 
 48                 });
 49                 builder.create().show();
 50                 break;
 51 
 52             case DOWNLOAD_ERROR:
 53                 Toast.makeText(SplashActivity.this, "下载更新失败", 1).show();
 54                 Log.i(TAG, "进入程序主界面 ");
 55                 pd.dismiss();
 56                 LoadMainUI();
 57                 break;
 58             case DOWNLOAD_SUCCESS:
 59                 pd.dismiss();
 60                 Log.i(TAG, "安装新的apk");
 61                 File file = (File) msg.obj;
 62                 //下载成功后安装apk
 63                 installApk(file);
 64                 break;
 65             }
 66         }
 67 
 68     };
 69 
 70     /**
 71      * 加载主界面
 72 */
 73     private void LoadMainUI() {
 74         Intent intent = new Intent(this, MainActivity.class);
 75         startActivity(intent);
 76         finish();
 77     }
 78 
 79     /**
 80      * 安装apk
 81 */
 82     private void installApk(File file) {
 83         Intent intent = new Intent();
 84         // 查看的意图 (动作)
 85         intent.setAction(Intent.ACTION_VIEW);
 86        
 87         /*
 88          * 不能先设置data再设置type这样会把data清除掉,所有使用setDataAndType
 89          * intent.setData(Uri.fromFile(file)); //mime 的数据类型
 90          * intent.setType("application/vnd.android.package-archive");
 91 */
 92 
 93         // MIME类型可以在tomcat里面的web.xml文件找到
 94         intent.setDataAndType(Uri.fromFile(file),
 95                 "application/vnd.android.package-archive");
 96         finish();
 97         startActivity(intent);
 98     }
 99 
100     @Override
101     public void onCreate(Bundle savedInstanceState) {
102         
103         // 全屏显示
104         requestWindowFeature(Window.FEATURE_NO_TITLE);
105         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
106                 WindowManager.LayoutParams.FLAG_FULLSCREEN);
107         
108         super.onCreate(savedInstanceState);
109         setContentView(R.layout.splash);
110 
111         
112         //进度条对话框的初始化
113         pd = new ProgressDialog(this);
114         //进度条的样式为水平进度
115         pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
116         
117         RelativeLayout rl = (RelativeLayout) this.findViewById(R.id.rl_splash);
118         //渐变动画
119         AlphaAnimation aa = new AlphaAnimation(0.0f, 1.0f);
120         TextView tv =  (TextView) this.findViewById(R.id.tv_version);
121         //动画的时间
122         aa.setDuration(4000);
123         //把动画作用到相对布局上(rl)
124         rl.setAnimation(aa);
125         
126             version = getAppVersion();
127             // 显示当前程序的版本号
128             tv.setText(version);
129             
130             //if( 判断是否检查需要更新 )
131 //创建线程  访问服务器 获取服务器上的版本信息 
132             new Thread(new CheckVersionTask()).start();
133             
134 
135     }
136 
137     /**
138      * 获取版本号
139      * @return
140 */
141     private String getAppVersion() {
142         try {
143             PackageManager packageManager = this.getPackageManager();
144 
145             // 第二个参数指定返回的数据,我们只需要版本信息,传入0即可
146             PackageInfo packInfo = packageManager.getPackageInfo(
147                     getPackageName(), 0);
148             return packInfo.versionName;
149         } catch (NameNotFoundException e) {
150             e.printStackTrace();
151             Toast.makeText(this, "获取版本好失败", 0).show();
152         }
153         return null;
154     }
155 
156     private class DownLoadFileTask implements Runnable {
157         String apkpath;
158 
159         public DownLoadFileTask(String apkpath) {
160             this.apkpath = apkpath;
161         }
162 
163         public void run() {
164             try {
165                 File file = DownLoadFileService.downLoad(apkpath, pd);
166                 Message msg = new Message();
167                 msg.obj = file;
168                 msg.what = DOWNLOAD_SUCCESS;
169                 handler.sendMessage(msg);
170             } catch (Exception e) {
171                 e.printStackTrace();
172                 Message msg = new Message();
173                 msg.what = DOWNLOAD_ERROR;
174                 handler.sendMessage(msg);
175             }
176         }
177 
178     }
179 
180     /**
181      * 检查服务器获取 最新的版本信息
182      * @author Administrator
183      * 
184 */
185     private class CheckVersionTask implements Runnable {
186 
187         public void run() {
188             try {
189                 String path = getResources().getString(R.string.serverurl);
190                 Log.i("SplashActivity", path);
191                 URL url = new URL(path);
192                 HttpURLConnection conn = (HttpURLConnection) url
193                         .openConnection();
194                 conn.setConnectTimeout(3000);
195                 InputStream is = conn.getInputStream();
196                 info = UpdateInfoParser.getUpdateInfo(is);
197                 // 如果服务上的版本信息 比客户端的信息大 提示用户升级
198                 String serverversion = info.getVersion();
199                 if (version.equals(serverversion)) {
200                     Log.i(TAG, "版本号相同无需升级");
201                 } else {
202                     Log.i(TAG, "版本号不相同提示用户升级");
203                     // 弹出对话框的操作必须在主线程里面
204                     Message msg = new Message();
205                     msg.what = SHOW_UPDATE_DIALOG;
206                     handler.sendMessage(msg);
207                 }
208             } catch (Exception e) {
209                 e.printStackTrace();
210                 Message msg = new Message();
211                 msg.what = CONNECT_SERVER_ERROR;
212                 handler.sendMessage(msg);
213             }
214 
215         }
216     }

MainActivity.java

 1 public class MainActivity extends Activity {
 2 
 3     LayoutInflater inflater;
 4     GridView gv;
 5     @Override
 6     protected void onCreate(Bundle savedInstanceState) {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.main);
 9         
10         gv = (GridView) this.findViewById(R.id.gv_main);
11         
12         gv.setAdapter(new MainActivityAdapter(this));
13         
14         gv.setOnItemClickListener(new MyItemClickListener());
15     }
16     
17     private class MyItemClickListener implements OnItemClickListener{
18         
19         /**
20          * parent : gridview
21          * view : 被点击的某个条目对应的view对象 linearlayout
22          * position : 被点击的条目对应位置的id
23          * id: 代表的第几行
24 */
25         public void onItemClick(AdapterView<?> parent, View view, int position,
26                 long id) {
27             
28             switch (position) {
29             case 0:
30                 Intent lostProtectedIntent = new Intent(MainActivity.this,LostProtectedActivity.class);
31                 startActivity(lostProtectedIntent);
32                 break;
33             }
34         }
35         
36     }
37 }

 1 　　　　 View view = inflater.inflate(R.layout.change_name_dialog, null);
 2         et_change_name = (EditText) view.findViewById(R.id.et_change_name);
 3         Button bt_ok = (Button) view.findViewById(R.id.bt_change_name_ok);
 4         Button bt_cancle = (Button) view.findViewById(R.id.bt_change_name_cancle);
 5         bt_ok.setOnClickListener(this);
 6         bt_cancle.setOnClickListener(this);
 7         AlertDialog.Builder builder  = new Builder(this);
 8         builder.setTitle("请输入修改的标题");
 9         builder.setView(view);
10         dialog = builder.create();
11         dialog.show();

Adapter适配器:

/**
     * 把当前item对应的view对象返回回去
     * 返回的View是每一个条目的View
*/
public View getView(int position, View convertView, ViewGroup parent) {
        SharedPreferences sp = context.getSharedPreferences("config", Context.MODE_PRIVATE);
        String name = sp.getString("name", "手机防盗");
//通过配置文件返回每一个条目的View对象
        View view =    inflater.inflate(R.layout.main_item, null);
        ImageView iv = (ImageView) view.findViewById(R.id.iv_main_item);
        TextView tv = (TextView)view.findViewById(R.id.tv_main_item);
        iv.setImageResource(icons[position]);
        tv.setText(names[position]);
boolean isempty = "".equals(name);
if((!isempty)&&position==0){
            tv.setText(name);
        }
return view;
    }