android开源框架android-async-http使用

转：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;

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import com.loopj.android.http.AsyncHttpClient;

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import com.loopj.android.http.AsyncHttpResponseHandler;

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import com.loopj.android.http.BinaryHttpResponseHandler;

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import com.loopj.android.http.JsonHttpResponseHandler;

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import com.loopj.android.http.RequestParams;

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public class HttpUtil {

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    private static     AsyncHttpClient client =new AsyncHttpClient();    //实例话对象

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    static

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    {

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        client.setTimeout(11000);   //设置链接超时，如果不设置，默认为10s

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    }

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    public static void get(String urlString,AsyncHttpResponseHandler res)    //用一个完整url获取一个string对象

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    {

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        client.get(urlString, res);

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    }

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    public static void get(String urlString,RequestParams params,AsyncHttpResponseHandler res)   //url里面带参数

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    {

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        client.get(urlString, params,res);

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    }

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    public static void get(String urlString,JsonHttpResponseHandler res)   //不带参数，获取json对象或者数组

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    {

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        client.get(urlString, res);

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    }

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    public static void get(String urlString,RequestParams params,JsonHttpResponseHandler res)   //带参数，获取json对象或者数组

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    {

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        client.get(urlString, params,res);

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    }

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    public static void get(String uString, BinaryHttpResponseHandler bHandler)   //下载数据使用，会返回byte数据

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    {

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        client.get(uString, bHandler);

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    }

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    public static AsyncHttpClient getClient()

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    {

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        return client;

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    }

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}

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;

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import java.io.File;

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import java.io.FileOutputStream;

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import org.json.JSONArray;

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import org.json.JSONObject;

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import android.app.Activity;

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import android.app.ProgressDialog;

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import android.os.Bundle;

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import android.os.Environment;

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import android.util.Log;

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import android.view.View;

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import android.widget.TextView;

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import android.widget.Toast;

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import com.loopj.android.http.AsyncHttpResponseHandler;

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import com.loopj.android.http.BinaryHttpResponseHandler;

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import com.loopj.android.http.JsonHttpResponseHandler;

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import com.loopj.android.http.RequestParams;

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public class MainActivity extends Activity {

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    private TextView textView; // 顶部textview

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    private ProgressDialog pDialog;

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    private TextView textView2; // 下面textview，显示获取的所有数据

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    @Override

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    protected void onCreate(Bundle savedInstanceState) {

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        super.onCreate(savedInstanceState);

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        setContentView(R.layout.activity_main);

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        textView = (TextView) findViewById(R.id.text);

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        textView2 = (TextView) findViewById(R.id.text2);

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    }

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    public void method1(View view) {

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        pDialog = ProgressDialog.show(this, "请稍等", "数据加载中");

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        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

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        HttpUtil.get(urlString, new AsyncHttpResponseHandler() {

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            public void onSuccess(String arg0) { // 获取数据成功会调用这里

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                pDialog.dismiss();

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                textView.setText("获取json数据成功，看下面");

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                textView2.setText(arg0);

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                Log.i("hck", arg0);

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            };

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            public void onFailure(Throwable arg0) { // 失败，调用

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                Toast.makeText(MainActivity.this, "onFailure",

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                        Toast.LENGTH_LONG).show();

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            };

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            public void onFinish() { // 完成后调用，失败，成功，都要掉

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            };

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        });

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    }

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    public void method2(View view) {

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        String urlString = "http://client.azrj.cn/json/cook/cook_list.jsp?";

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        RequestParams params = new RequestParams(); // 绑定参数

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        params.put("type", "1");

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        params.put("p", "2");

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        params.put("size", "10");

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        HttpUtil.get(urlString, params, new JsonHttpResponseHandler() {

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            public void onSuccess(JSONArray arg0) { // 成功后返回一个JSONArray数据

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                Log.i("hck", arg0.length() + "");

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                try {

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                    textView.setText("菜谱名字："

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                            + 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

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                } catch (Exception e) {

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                    Log.e("hck", e.toString());

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                }

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            };

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            public void onFailure(Throwable arg0) {

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                Log.e("hck", " onFailure" + arg0.toString());

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            };

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            public void onFinish() {

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                Log.i("hck", "onFinish");

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            };

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            public void onSuccess(JSONObject arg0) {   //返回的是JSONObject，会调用这里

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                Log.i("hck", "onSuccess ");

076
                try {

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                    textView.setText("菜谱名字："

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                            + arg0.getJSONArray("list").getJSONObject(0)

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                                    .getString("name"));

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                } catch (Exception e) {

081
                    Log.e("hck", e.toString());

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                }

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            };

084
        });

085
    }

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    public void method3(View view) {

087
        String urlString = "http://client.azrj.cn/json/cook/cook_list.jsp?type=1&p=2&size=10";

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        HttpUtil.get(urlString, new JsonHttpResponseHandler() {

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            public void onSuccess(JSONObject arg0) {

090
                try {

091
                    textView.setText("菜谱名字："

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                            + arg0.getJSONArray("list").getJSONObject(1)

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                                    .getString("name"));

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                } catch (Exception e) {

095
                    Log.e("hck", e.toString());

096
                }

097
            };

098
        });

099
    }

100
    public void method4(View view) {

101
        String urlString = "http://client.azrj.cn/json/cook/cook_list.jsp?";

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        final RequestParams params = new RequestParams();

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        params.put("type", "1");

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        params.put("p", "2");

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        params.put("size", "10");

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        HttpUtil.get(urlString, params, new AsyncHttpResponseHandler() {

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            public void onSuccess(String arg0) {

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                try {

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                    JSONObject jObject = new JSONObject(arg0);

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                    textView.setText("菜谱名字："

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                            + jObject.getJSONArray("list").getJSONObject(2)

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                                    .getString("name"));

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                    Log.i("hck", params.getEntity().toString());

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                } catch (Exception e) {

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                }

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            };

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        });

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    }

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    public void method5(View view) {

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        String url = "http://f.hiphotos.baidu.com/album/w%3D2048/sign=38c43ff7902397ddd6799f046dbab3b7/9c16fdfaaf51f3dee973bf7495eef01f3b2979d8.jpg";

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        HttpUtil.get(url, new BinaryHttpResponseHandler() {

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            @Override

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            public void onSuccess(byte[] arg0) {

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                super.onSuccess(arg0);

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                File file = Environment.getExternalStorageDirectory();

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                File file2 = new File(file, "cat");

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                file2.mkdir();

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                file2 = new File(file2, "cat.jpg");

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                try {

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                    FileOutputStream oStream = new FileOutputStream(file2);

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                    oStream.write(arg0);

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                    oStream.flush();

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                    oStream.close();

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                    textView.setText("可爱的猫咪已经保存在sdcard里面");

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                } catch (Exception e) {

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                    e.printStackTrace();

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                    Log.i("hck", e.toString());

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                }

139
            }

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        });

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    }

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}

布局文件：

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<ScrollView

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    xmlns:android="http://schemas.android.com/apk/res/android"

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    xmlns:tools="http://schemas.android.com/tools"

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    android:layout_width="match_parent"

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    android:layout_height="match_parent"

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    android:orientation="vertical"

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      android:gravity="center_horizontal"

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    >

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    <LinearLayout

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    android:layout_width="fill_parent"

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    android:layout_height="fill_parent"

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    android:orientation="vertical"

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      android:gravity="center_horizontal">

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    <TextView

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        android:textColor="#FF0000"

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        android:textSize="16sp"

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       android:layout_marginTop="20dp"

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     android:gravity="center_horizontal"

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        android:id="@+id/text"

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        android:layout_width="wrap_content"

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        android:layout_height="wrap_content"

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        android:text="获取数据完成后会显示在这里" />

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<Button

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    android:layout_marginTop="50dp"

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    android:id="@+id/bt1"

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    android:layout_width="wrap_content"

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    android:layout_height="wrap_content"

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    android:text="第一种"

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    android:onClick="method1"

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    />

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<Button

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    android:id="@+id/bt2"

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    android:layout_width="wrap_content"

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    android:layout_height="wrap_content"

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    android:text="第2种"

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    android:onClick="method2"

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    />

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<Button

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    android:id="@+id/bt3"

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    android:layout_width="wrap_content"

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    android:layout_height="wrap_content"

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    android:text="第3种"

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      android:onClick="method3"

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    />

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<Button

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    android:id="@+id/bt4"

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    android:layout_width="wrap_content"

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    android:layout_height="wrap_content"

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    android:text="第4种"

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      android:onClick="method4"

51
    />

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<Button

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    android:id="@+id/bt5"

54
    android:layout_width="wrap_content"

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    android:layout_height="wrap_content"

56
    android:text="第5种"

57
      android:onClick="method5"

58
    />

59
  <TextView

60
        android:textColor="#FF0000"

61
        android:textSize="16sp"

62
       android:layout_marginTop="20dp"

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     android:gravity="center_horizontal"

64
        android:id="@+id/text2"

65
        android:layout_width="wrap_content"

66
        android:layout_height="wrap_content"

67
         />

68
</LinearLayout>

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</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