实例讲解Android多线程应用开发中Handler的使用

package com.Handler5; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ProgressBar; 
import android.widget.TextView; 
 
public class Handler5Activity extends Activity { 
  /** Called when the activity is first created. */ 
  private ProgressBar progressBar; 
  private Button button; 
  private TextView textView; 
  private MyHandler myHandler=new MyHandler(); 
  int i=0; 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
   
    setContentView(R.layout.main); 
    progressBar = (ProgressBar)this.findViewById(R.id.progressBar1); 
    textView=(TextView)this.findViewById(R.id.textView1); 
  } 
  class MyHandler extends Handler{ 
    @Override 
    public void handleMessage(Message msg) { 
      int pos =(Integer)msg.obj; 
      progressBar.setProgress(pos); 
      textView.setText(pos+"%"); 
       
    } 
  } 
  public void downLoad(View view){ 
      
    new Thread(new Runnable() { 
       
      @Override 
      public void run() { 
        while(i<=100){ 
          try { 
            Thread.sleep(300); 
            i+=10; 
            Message message=Message.obtain(); 
            message.obj=i; 
            myHandler.sendMessage(message); 
          } catch (InterruptedException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
          } 
         
        } 
         
      } 
    }).start(); 
  } 
} 

效果：

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