android开启线程，异步处理数据实例

package com.example.sywang2;

import com.zds.os.R;

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

public class MainActivity extends Activity {    private TextView text;    private Button btn1;  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   text=(TextView)findViewById(R.id.txt);   btn1=(Button)findViewById(R.id.btn);  }

 @Override  public boolean onCreateOptionsMenu(Menu menu) {   // Inflate the menu; this adds items to the action bar if it is present.   getMenuInflater().inflate(R.menu.main, menu);   return true;  }    //定义一个handler，用来异步处理数据     Handler handler = new Handler(){         public void handleMessage(android.os.Message msg) {             System.out.println("结果返回，正在处理....");                         if (msg.what == 1) {                 text.setText("异步处理结果是 === handler"); //                thread.stop();             }                     };     };             //新开一条线程，用来异步处理数据，结果通过handler返回     Thread thread = new Thread(){         public void run() {             System.out.println("start thread,,,,");                         handler.sendEmptyMessage(1);         };     };             //点击按钮     public void StartTest(View v){         thread.start();                 try {             Thread.sleep(2000);         } catch (InterruptedException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }                 System.out.println("onClick,,,,");     }    

}