private int change = 0;//記錄下標private int[] ids = new int[]{R.drawable.anim_one, R.drawable.anim_two, R.drawable.anim_three};private Drawable[] drawables;//圖片集合private Thread mThread;//線程private boolean mThreadFlag = true;//線程結束標志符

private void initDrawableView() {    //填充圖片    drawables = new Drawable[ids.length];    for (int i = 0; i < ids.length; i++) {      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {        drawables[i] = getDrawable(ids[i]);      } else {        drawables[i] = getResources().getDrawable(ids[i]);      }    }  }

private Handler mHandler = new Handler(new Handler.Callback() {    @Override    public boolean handleMessage(Message msg) {      int duration = msg.arg1;      TransitionDrawable transitionDrawable = new TransitionDrawable(new Drawable[]{drawables[change % ids.length],          drawables[(change + 1) % ids.length]});      change++;//改變標識位置      repeatPlay.setBackground(transitionDrawable);      transitionDrawable.startTransition(duration);      return false;    }  });

private class MyRunnable implements Runnable {    @Override    public void run() {      //這個while(true)是做死循環      while (mThreadFlag) {        int duration = 5000;//改變的間隔        Message message = mHandler.obtainMessage();        message.arg1 = duration;        mHandler.sendMessage(message);        try {          Thread.sleep(duration);          //隔duration秒發送一次        } catch (InterruptedException e) {          e.printStackTrace();        }      }    }  }

mThread = new Thread(new MyRunnable());mThread.start();

mThreadFlag = false;//結束線程