Question

我的游戏活动中有一个倒数计时器，当我接到来电或者我的活动失去焦点时，我需要暂停。我试过这样但它不起作用（onPause方法有效，它会停止计时器，但它不会恢复它）：

private long total = 180000;

MyCount brojacVremena = new MyCount(total, 1000);

public class MyCount extends CountDownTimer {

        public MyCount(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        @Override
        public void onFinish() {


        @Override
        public void onTick(long millisUntilFinished) {
            total = millisUntilFinished;
            vreme.setText("" + millisUntilFinished / 1000);

        }
        }

@Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        MyCount brojacVremena = new MyCount(total, 1000);
        brojacVremena.start();
    }

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    brojacVremena.cancel();
}

我在onPause中尝试了这个：

@Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        MyCount brojacVremenaNew = new MyCount(total, 1000);
        brojacVremenaNew.cancel();
}

Answer 1

除非真的有必要，否则我认为你不需要扩展它。我的第二个代码是魔术师所说的 - 存储时间时间留在onPause()中的变量中，而不要忘记将其保存在onSaveInstanceState()或SharedPreference中。

当您的活动恢复时，无论是由于配置更改还是其他原因，您都可以重新创建计时器：

new CountDownTimer(millisUntilFinished, tickTime) {

     public void onTick(long millisUntilFinished) {
         millisUntilFinished -= tickTime;
         // do you wanna know for whom the bell tolls?
     }

     public void onFinish() {
         // it tolls for thee
         millisUntilFinished = 0;
     }
  }.start();

在onPause()中，取消此计时器并在onResume()中根据剩余时间创建一个新的计时器实例:)

修改像这样：

@Override public void onResume(){ super.onResume(); millisUntilFinished = getMillisFromSharedPreference(KEY); if(millisUntilFinished != 0){ new CountDownTimer(millisUntilFinished, tickTime) { public void onTick(long millisUntilFinished) { millisUntilFinished -= tickTime; // do you wanna know for whom the bell tolls? } public void onFinish() { // it tolls for thee millisUntilFinished = 0; } }.start(); } } @Override public void onPause(){ super.onPause(); saveMillisToSharedPreference(KEY,millisUntilFinished); }

如何暂停和恢复倒数计时器？

1 个答案: