Android应用中使用AsyncHttpClient来异步网络数据

首先下载AsyncHttpClient的库文件，可以自行搜索，可以到下面地址下载

http://download.csdn.net/detail/xujinyang1234/5767419

测试的Activity，用到了RequstClient,LoadCacheResponseLoginouthandler,LoadDatahandler三个重写的类

package com.example.asynchttpclienttest;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;

import com.loopj.android.http.RequestParams;

public class MainActivity extends Activity {
	private TextView test;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		init();
	}

	private void init() {
		test = (TextView) findViewById(R.id.test);
		System.out.println("拉拉");
		RequestParams param = new RequestParams();
		param.put("id", 1 + "");
		RequstClient.get(
				"http://58.192.23.75:8080/xiaoxiao2/ColumnServletAndroid",
				param, new LoadCacheResponseLoginouthandler(MainActivity.this,
						new LoadDatahandler() {
							@Override
							public void onStart() {
								super.onStart();
								test.setText("开始拉去数据");
							}

							@Override
							public void onSuccess(String data) {
								super.onSuccess(data);
								test.setText(data);
								System.out.println("拉倒的数据" + data);
							}

							@Override
							public void onFailure(String error, String message) {
								super.onFailure(error, message);
								test.setText("错误的数据" + message);
							}

							@Override
							public void onFinish() {
								super.onFinish();
							}
						}));
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

RequstClient.java

package com.example.asynchttpclienttest;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

public class RequstClient {
	/**
	 * 定义一个异步网络客户端 默认超时未20秒 当超过，默认重连次数为5次 默认最大连接数为10个
	 */
	private static AsyncHttpClient mClient = new AsyncHttpClient();
	static {
		mClient.setTimeout(20000);
	}
	public static void post(String url, AsyncHttpResponseHandler handler) {
		post(url, null, handler);
	}
	/**
	 * post 请求
	 * 
	 * @param url
	 *            API 地址
	 * @param params
	 *            请求的参数
	 * @param handler
	 *            数据加载句柄对象
	 */
	public static void post(String url, RequestParams params,
			AsyncHttpResponseHandler handler) {
		System.out.println("进入post");
		mClient.post(url, params, handler);
	}
	public static void get(String url, AsyncHttpResponseHandler handler) {

	}
	public static void get(String url, RequestParams params,
			AsyncHttpResponseHandler handler) {
		System.out.println("进入get");
		mClient.get(url, params, handler);
	}
}

package com.example.asynchttpclienttest;

import org.apache.http.Header;

import android.content.Context;

import com.loopj.android.http.AsyncHttpResponseHandler;

public class LoadCacheResponseLoginouthandler extends AsyncHttpResponseHandler {
	private Context context;
	private LoadDatahandler mHandler;

	public LoadCacheResponseLoginouthandler(Context context,
			LoadDatahandler mHandler) {
		this.context = context;
		this.mHandler = mHandler;
	}
	@Override
	public void onStart() {
		super.onStart();
		mHandler.onStart();
	}
	@Override
	public void onFailure(Throwable error, String content) {
		super.onFailure(error, content);
		mHandler.onFailure("", "网络连接超时");
	}
	@Override
	public void onFinish() {
		super.onFinish();
		mHandler.onFinish();
	}

	@Override
	public void onSuccess(int statusCode, Header[] headers, String content) {
		super.onSuccess(statusCode, headers, content);
		System.out.println("得到的返回码" + statusCode);
		try {
			switch (statusCode) {
			case 200:
				mHandler.onSuccess(content);
				System.out.println("返回的内容" + content);
				break;
			case 401:
				onFailure("401", "没有登录");

				break;
			case 403:
				onFailure("404", "没有权限");
				break;
			default:
				break;
			}

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 出错
	 * 
	 * @param error
	 * @param errorMessage
	 */
	public void onFailure(String error, String errorMessage) {
		if (errorMessage != null) {
			mHandler.onFailure(error, errorMessage);
		}
	}
}

接口：

package com.example.asynchttpclienttest;

public class LoadDatahandler {
	/**
	 * 加载数据时调用
	 */
	public void onStart() {};
	/**
	 * 加载数据调用,得到缓存数据
	 * @param data
	 */
	public void onLoadCaches(String data) {};
	/**
	 * 当调用服务器接口成功获取数据时,调用这个方法
	 * @param data
	 */
	public void onSuccess(String data) {};
	
	/**
	 * 当调用服务器接口获取数据失败时,调用这个方法
	 * @param error		出错原因
	 * @param message	出错原因描述
	 */
	public void onFailure(String error, String message) {};
	/**
	 * 加载完成时调用
	 */
	public void onFinish() {};

}

扩展：

Android在AsyncHttpClient框架的基础上定制能直接返回对象数组的框架