public class MyThread extends Thread { 

  //继承Thread类，并改写其run方法    
  private final static String TAG = "My Thread ===> ";   
  public void run(){ 
    Log.d(TAG, "run"); 
    for(int i = 0; i<100; i++) 
    { 
      Log.e(TAG, Thread.currentThread().getName() + "i = " + i); 
    } 
  } 
} 

public class MyRunnable implements Runnable{ 
  private final static String TAG = "My Runnable ===> "; 

  @Override 
  public void run() { 
    // TODO Auto-generated method stub 
    Log.d(TAG, "run"); 
    for(int i = 0; i<1000; i++) 
    { 
      Log.e(TAG, Thread.currentThread().getName() + "i = " + i); 
    } 
  } 
} 

 btn.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        new Thread(new Runnable() {
          @Override
          public void run() {
            try {
              ...
            } catch (Exception e) {
              e.printStackTrace();
            }
          }
        }).start();
      }
    });

public class MainActivity extends Activity {   
  private final static String TAG = "UOfly Android Thread ==>"; 
  private int count = 0; 
  private Handler mHandler = new Handler(); 
  private Runnable mRunnable = new Runnable() { 
    public void run() { 
      Log.e(TAG, Thread.currentThread().getName() + " " + count); 
      count++; 
      setTitle("" + count); 
      // 每3秒执行一次 
      mHandler.postDelayed(mRunnable, 3000); //给自己发送消息，自运行
    } 
  }; 
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    // 通过Handler启动线程 
    mHandler.post(mRunnable); //发送消息，启动线程运行
  } 

   @Override   
     protected void onDestroy() {    
       //将线程销毁掉    
       mHandler.removeCallbacks(mRunnable);    
       super.onDestroy();    
     }    

}