android开源框架android-async-http使用

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：

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：

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());
                }
            }
        });
    }
}

<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>