android 秒表在屏幕关闭时停止工作

Question

您好，我最近制作了一个简单的秒表应用程序，它运行良好。但是，当我切换屏幕并将其重新打开时，计时器会显示最后一个时间值。例如，如果计时器显示 00:00:10 ，将屏幕(5 秒)重新打开，它会显示相同的值并开始增加时间值。

有什么建议吗？

谢谢

      if (savedInstanceState != null) {
        seconds = savedInstanceState.getInt("seconds");
        running = savedInstanceState.getBoolean("running");
        wasRunning = savedInstanceState.getBoolean("wasRunning");
    }

    runTimer();
}


public void onClickStart(View view){
    running = true;
}

public void onClickStop(View view){
    running = false;
}

public void onClickReset(View view){
    running = false;
    seconds = 0;
}


@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    savedInstanceState.putInt("seconds", seconds);
    savedInstanceState.putBoolean("running", running);
    savedInstanceState.putBoolean("wasRunning",wasRunning);
}


@Override
protected void onPause(){
    super.onPause();
    wasRunning = running;
    running = false;
}

@Override
protected void onResume(){
    super.onResume();
    if(wasRunning){
        running = true;
    }
}

@Override
protected void onStop(){
    super.onStop();
    wasRunning = running;
    running = false;
}

@Override
protected void onStart(){
    super.onStart();
    if(wasRunning){
        running = true;
    }
}

private void runTimer(){
    final TextView timeView = (TextView)findViewById(R.id.time_view);
    final Handler handler = new Handler();

    handler.post(new Runnable() {
        @Override
        public void run() {

            int hours = seconds/3600;
            int minutes = (seconds%3600)/60;
            int secs = seconds%60;

            String time = String.format("%d:%02d:%02d",hours,minutes,secs);
            timeView.setText(time);

            if(running){
                seconds++;
            }
            handler.postDelayed(this,1000);
        }
    });

}

Answer 1

@Override
protected void onPause(){
    super.onPause();
    wasRunning = running;
    running = false;
}

@Override
protected void onResume(){
    super.onResume();
    if(wasRunning){
        running = true;
    }
}

@Override
protected void onStop(){
    super.onStop();
    wasRunning = running;
    running = false;
}

@Override
protected void onStart(){
    super.onStart();
    if(wasRunning){
        running = true;
    }
}

只需查看您的代码，您正在更改 running 的值至 false每当你的 Activity Pauses或 Stops .并查看计时器，它只会在 running 时增加值是true .