Android handle学习笔记

public class MainActivity extends Activity {     private ProgressBar progressBar;   private Button button;     @Override   protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    progressBar = (ProgressBar) findViewById(R.id.progressBar1);    button = (Button) findViewById(R.id.button1);    button.setOnClickListener(new OnClickListener() {       @Override     public void onClick(View arg0) {      progressBar.setVisibility(View.VISIBLE);      handle.post(run);      System.out.println("start...");     }    });   }     Handler handle = new Handler() {    @Override    public void handleMessage(Message msg) {     System.out.println("handle...");     progressBar.setProgress(msg.arg1);     handle.post(run);      }   };     Runnable run = new Runnable() {       int i = 0;             @Override    public void run() {     System.out.println(Thread.currentThread()+"---->"+i);     i=i+10;     Message message = handle.obtainMessage();     message.arg1 = i;          try {      Thread.sleep(1000);     } catch (InterruptedException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }     if(i>100){      i=0;      handle.removeCallbacks(run);      //handle.sendMessage(message);     }     else{     handle.sendMessage(message);     }    }   };    }