android开源框架android-async-http使用

原文地址：http://www.open-open.com/lib/view/open1369637365753.html

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：

<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