android开源框架android-async-http使用

android-async-http开源框架可以是我们轻松的获取网络数据或者向服务器发送数据，使用起来也很简单，下面做简单介绍，具体详细使用看官网：https://github.com/loopj/android-async-http

1.新建项目，去官网下载zip包，解压，打开releases文件，把里面最新的jar包，考入项目工程libs目录下，引入包。

2.通过1，就可以使用了，很简单，下面是自己写的demo，用它提供的各种不同方法完成从服务器获取一个json数据：

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package com.http; import com.loopj.android.http.AsyncHttpClient; import com.loopj.android.http.AsyncHttpResponseHandler; import com.loopj.android.http.BinaryHttpResponseHandler; import com.loopj.android.http.JsonHttpResponseHandler; import com.loopj.android.http.RequestParams;   public class HttpUtil {      private static     AsyncHttpClient client = new AsyncHttpClient();     //实例话对象      static      {          client.setTimeout( 11000 );    //设置链接超时，如果不设置，默认为10s      }      public static void get(String urlString,AsyncHttpResponseHandler res)     //用一个完整url获取一个string对象      {          client.get(urlString, res);      }      public static void get(String urlString,RequestParams params,AsyncHttpResponseHandler res)    //url里面带参数      {          client.get(urlString, params,res);      }      public static void get(String urlString,JsonHttpResponseHandler res)    //不带参数，获取json对象或者数组      {          client.get(urlString, res);      }      public static void get(String urlString,RequestParams params,JsonHttpResponseHandler res)    //带参数，获取json对象或者数组      {          client.get(urlString, params,res);      }      public static void get(String uString, BinaryHttpResponseHandler bHandler)    //下载数据使用，会返回byte数据      {          client.get(uString, bHandler);      }      public static AsyncHttpClient getClient()      {          return client;      } }

这个类主要列出了我们常用的get方法，在要使用的地方，调用该类就行了。

具体使用的类：

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package com.http;   import java.io.File; import java.io.FileOutputStream;   import org.json.JSONArray; import org.json.JSONObject;   import android.app.Activity; import android.app.ProgressDialog; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.View; import android.widget.TextView; import android.widget.Toast;   import com.loopj.android.http.AsyncHttpResponseHandler; import com.loopj.android.http.BinaryHttpResponseHandler; import com.loopj.android.http.JsonHttpResponseHandler; import com.loopj.android.http.RequestParams;   public class MainActivity  extends Activity {      private TextView textView;  // 顶部textview      private ProgressDialog pDialog;      private TextView textView2;  // 下面textview，显示获取的所有数据      @Override      protected void onCreate(Bundle savedInstanceState) {          super .onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          textView = (TextView) findViewById(R.id.text);          textView2 = (TextView) findViewById(R.id.text2);      }      public void method1(View view) {          pDialog = ProgressDialog.show( this ,  "请稍等" ,  "数据加载中" );          String urlString =  "http://client.azrj.cn/json/cook/cook_list.jsp?type=1&p=2&size=10" ; // 一個獲取菜谱的url地址          HttpUtil.get(urlString,  new AsyncHttpResponseHandler() {              public void onSuccess(String arg0) {  // 获取数据成功会调用这里                  pDialog.dismiss();                  textView.setText( "获取json数据成功，看下面" );                  textView2.setText(arg0);                  Log.i( "hck" , arg0);              };              public void onFailure(Throwable arg0) {  // 失败，调用                  Toast.makeText(MainActivity. this ,  "onFailure" ,                          Toast.LENGTH_LONG).show();              };              public void onFinish() {  // 完成后调用，失败，成功，都要掉              };          });      }      public void method2(View view) {          String urlString =  "http://client.azrj.cn/json/cook/cook_list.jsp?" ;          RequestParams params =  new RequestParams();  // 绑定参数          params.put( "type" ,  "1" );          params.put( "p" ,  "2" );          params.put( "size" ,  "10" );          HttpUtil.get(urlString, params,  new JsonHttpResponseHandler() {              public void onSuccess(JSONArray arg0) {  // 成功后返回一个JSONArray数据                  Log.i( "hck" , arg0.length() +  "" );                  try {                      textView.setText( "菜谱名字："                              + arg0.getJSONObject( 2 ).getString( "name" ));  //返回的是JSONArray， 获取JSONArray数据里面的第2个JSONObject对象，然后获取名字为name的数据值                  }  catch (Exception e) {                      Log.e( "hck" , e.toString());                  }              };              public void onFailure(Throwable arg0) {                  Log.e( "hck" ,  " onFailure" + arg0.toString());              };              public void onFinish() {                  Log.i( "hck" ,  "onFinish" );              };              public void onSuccess(JSONObject arg0) {    //返回的是JSONObject，会调用这里                  Log.i( "hck" ,  "onSuccess " );                  try {                      textView.setText( "菜谱名字："                              + arg0.getJSONArray( "list" ).getJSONObject( 0 )                                      .getString( "name" ));                  }  catch (Exception e) {                      Log.e( "hck" , e.toString());                  }              };          });      }      public void method3(View view) {          String urlString =  "http://client.azrj.cn/json/cook/cook_list.jsp?type=1&p=2&size=10" ;          HttpUtil.get(urlString,  new JsonHttpResponseHandler() {              public void onSuccess(JSONObject arg0) {                  try {                      textView.setText( "菜谱名字："                              + arg0.getJSONArray( "list" ).getJSONObject( 1 )                                      .getString( "name" ));                  }  catch (Exception e) {                      Log.e( "hck" , e.toString());                  }              };          });      }      public void method4(View view) {          String urlString =  "http://client.azrj.cn/json/cook/cook_list.jsp?" ;          final RequestParams params =  new RequestParams();          params.put( "type" ,  "1" );          params.put( "p" ,  "2" );          params.put( "size" ,  "10" );          HttpUtil.get(urlString, params,  new AsyncHttpResponseHandler() {              public void onSuccess(String arg0) {                  try {                      JSONObject jObject =  new JSONObject(arg0);                      textView.setText( "菜谱名字："                              + jObject.getJSONArray( "list" ).getJSONObject( 2 )                                      .getString( "name" ));                      Log.i( "hck" , params.getEntity().toString());                  }  catch (Exception e) {                  }              };          });      }      public void method5(View view) {          String url =  "http://f.hiphotos.baidu.com/album/w%3D2048/sign=38c43ff7902397ddd6799f046dbab3b7/9c16fdfaaf51f3dee973bf7495eef01f3b2979d8.jpg" ;          HttpUtil.get(url,  new BinaryHttpResponseHandler() {              @Override              public void onSuccess( byte [] arg0) {                  super .onSuccess(arg0);                  File file = Environment.getExternalStorageDirectory();                  File file2 =  new File(file,  "cat" );                  file2.mkdir();                  file2 =  new File(file2,  "cat.jpg" );                  try {                      FileOutputStream oStream =  new FileOutputStream(file2);                      oStream.write(arg0);                      oStream.flush();                      oStream.close();                      textView.setText( "可爱的猫咪已经保存在sdcard里面" );                  }  catch (Exception e) {                      e.printStackTrace();                      Log.i( "hck" , e.toString());                  }              }          });      } }

布局文件：

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< ScrollView      xmlns:android = "http://schemas.android.com/apk/res/android"      xmlns:tools = "http://schemas.android.com/tools"      android:layout_width = "match_parent"      android:layout_height = "match_parent"      android:orientation = "vertical"        android:gravity = "center_horizontal"      >      < LinearLayout      android:layout_width = "fill_parent"      android:layout_height = "fill_parent"      android:orientation = "vertical"        android:gravity = "center_horizontal" >      < TextView          android:textColor = "#FF0000"          android:textSize = "16sp"         android:layout_marginTop = "20dp"       android:gravity = "center_horizontal"          android:id = "@+id/text"          android:layout_width = "wrap_content"          android:layout_height = "wrap_content"          android:text = "获取数据完成后会显示在这里" /> < Button      android:layout_marginTop = "50dp"      android:id = "@+id/bt1"      android:layout_width = "wrap_content"      android:layout_height = "wrap_content"      android:text = "第一种"      android:onClick = "method1"      /> < Button      android:id = "@+id/bt2"      android:layout_width = "wrap_content"      android:layout_height = "wrap_content"      android:text = "第2种"      android:onClick = "method2"      /> < Button      android:id = "@+id/bt3"      android:layout_width = "wrap_content"      android:layout_height = "wrap_content"      android:text = "第3种"        android:onClick = "method3"      /> < Button      android:id = "@+id/bt4"      android:layout_width = "wrap_content"      android:layout_height = "wrap_content"      android:text = "第4种"        android:onClick = "method4"      /> < Button      android:id = "@+id/bt5"      android:layout_width = "wrap_content"      android:layout_height = "wrap_content"      android:text = "第5种"        android:onClick = "method5"      />    < TextView          android:textColor = "#FF0000"          android:textSize = "16sp"         android:layout_marginTop = "20dp"       android:gravity = "center_horizontal"          android:id = "@+id/text2"          android:layout_width = "wrap_content"          android:layout_height = "wrap_content"           /> </ LinearLayout > </ ScrollView >

 

很简单很实用，上面只是get方法的，上传数据，和这个也差不多，大家自己建个服务器，试试。记得加入网文网络的权限和向sdcard的访问权限