Android(Java):线程

new Thread() {
   public void run() {
    Drawable drawable = loadImageFromUrl(imageUrl);
    imageCache.put(imageUrl, new SoftReference<Drawable>(drawable));
    Message message = handler.obtainMessage(0, drawable);
    handler.sendMessage(message);
   }
  }.start();

new Thread(new Runnable() {
     @Override
     public void run() {
      // TODO Auto-generated method stub
      int i = 59;
      while(i<=0){
       i--;
       Thread.sleep(1000);
      }
       }
    }).start();

 

线程不能操作UI

new Thread(){
     @Override
     public void run() {
      // TODO Auto-generated method stub
      try {
       int i = 59;
       while(i>=0){
        mHandler.sendEmptyMessage(i);
        i--;
        Thread.sleep(1000);
       }
      } catch (InterruptedException e) {
       // TODO Auto-generated catch block
       e.printStackTrace();
      }
     }
    }.start();

private Handler mHandler = new Handler() {
  public void handleMessage(Message msg) {
   if(msg.what == 0){
    mBtnSend.setBackgroundResource(R.drawable.btn_send_selected);
    mBtnSend.setText(R.string.send);
    mBtnSend.setEnabled(true);
    return;
   }
   mBtnSend.setText(resend+msg.what+second);
  }
 };