android Thread 数据加载 ProgressDialog 请求超时处置 线程 Handler

package com.qihoinfo;import java.util.HashMap;import java.util.Map;import org.json.JSONArray;import org.json.JSONObject;import com.qihoinfo.util.ClientService;import android.app.Activity;import android.app.ProgressDialog;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.widget.TextView;public class MainActivity extends Activity {	String requestByHttpGet = null;	String requestByHttpPost = null;	String returnResult ="";	String url_str = "http://192.168.1.67/androidjson.php";	Map<String, String> params = null;	TextView textView;		// 声明变量	private ProgressDialog pd;	// 定义Handler对象	private Handler handler = new Handler() {		@Override		// 当有消息发送出来的时候就执行Handler的这个方法		public void handleMessage(Message msg) {			super.handleMessage(msg);			switch (msg.what) {			case 0: 				textView.setText(returnResult);				break;			default:				textView.setText("请求严重超时,请检查你的网络设置是否通畅!");				break;			}			// 只要执行到这里就关闭对话框			pd.dismiss();		}	};	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		Log.i("tag", "onCreate()-->" + Thread.currentThread().getName());		textView = (TextView) findViewById(R.id.text);		processThread();		textView.setText(returnResult);	}	private void processThread() {		// 构建一个下载进度条		pd = ProgressDialog.show(MainActivity.this, "加载数据", "网络数据加载中......");		Log.i("tag", "processThread()-->" + Thread.currentThread().getName());		new Thread() {			@Override			public void run() {				Log.i("tag", "run()-->" + Thread.currentThread().getName());								//执行请求数据的方法			    longTimeMethod();			    				if(returnResult.equals("")){					// 执行完毕后给handler发送一个超时消息					handler.sendEmptyMessage(1);				}else{					// 执行完毕后给handler发送一个空消息					handler.sendEmptyMessage(0);				}			}		}.start();	}	// 模拟下载文件的长耗时方法	private void longTimeMethod() {		try {			Log.i("tag", "longTimeMethod-->" + Thread.currentThread().getName());			Thread.sleep(0);			params = new HashMap<String, String>();			params.put("name", "张三");			try {				requestByHttpGet = ClientService.requestByHttpGet(url_str,						params, "UTF-8");				JSONArray jArray = new JSONArray(requestByHttpGet);				if (jArray.length() > 0 && jArray != null) {					for (int i = 0; i < jArray.length(); i++) {						JSONObject json_data = jArray.getJSONObject(i);						// 通过返回的json储存的搜索过得mysql列表值进行获取						Log.e("json", json_data.toString());						returnResult += "\n您的名称是 ："								+ json_data.getString("uName") + "\nid："								+ json_data.getString("id");					}				}				requestByHttpPost = ClientService.requestByHttpPost(url_str,						params, "UTF-8");				JSONArray jArray2 = new JSONArray(requestByHttpPost);				for (int i = 0; i < jArray2.length(); i++) {					JSONObject json_data = jArray2.getJSONObject(i);					// 通过返回的json储存的搜索过得mysql列表值进行获取					Log.e("json", json_data.toString());					returnResult += "\n您的名称是 ：" + json_data.getString("uName")							+ "\nid：" + json_data.getString("id"); 				}			} catch (Exception e) {				e.printStackTrace();			}		} catch (InterruptedException e) {			e.printStackTrace();		}	}}