2回答

好帮手慕雪

2017-08-09

已采纳

1）activity.mTime.setText(String.valueOf(value));不是activity.mTime.setText(String.valueOf(9));  2）修改whlie (value >= 0) {改成if(value > 0) 。3)修改message.arg1 = value;成message.arg1 = value-1;

0

hyau

h 啊，原来是while的问题，我明白了，谢谢老师

h017-08-09

共1条回复

好帮手慕雪

2017-08-09

为了方便测试你的问题，请把你的源代码粘贴一下。

0

hyau

h private static class MyHandler extends Handler{ final WeakReference<CountDownActivity> weakReference; MyHandler(CountDownActivity activity) { this.weakReference = new WeakReference<>(activity); } @Override public void handleMessage(Message msg) { super.handleMessage(msg); CountDownActivity activity = weakReference.get(); if (msg != null && msg.what == COUNT_DOWN_CODE) { int value = msg.arg1; activity.mTime.setText(String.valueOf(9)); while (value >= 0) { Message message = Message.obtain(); message.what = COUNT_DOWN_CODE; message.arg1 = value; sendMessageDelayed(message, 1000); } } } } }

h017-08-09

共2条回复