Android计时器正在使用

Question

Hi plan to development and android countdown timer app for the activity with start and stop button when user click start button display timer countdown and user go to remaining activities when the timer is running background如果用户单击stop，则仅停止计时器。Hi plan to development and android countdown timer app。

如何在服务中运行计时器并在活动android中更新文本视图的时间。

Answer 1

是的，你可以。我给你一个我很久以前用过的代码示例。请记住，这并不是使用按钮，但它将为您提供一个大致的操作方法。此代码使用当前倒计时值更新ActionBar菜单项

这是服务：

public class CountDownTimerService extends Service {
static long TIME_LIMIT = 300000;
CountDownTimer Count;



@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    super.onStartCommand(intent, flags, startId);
    Count = new CountDownTimer(TIME_LIMIT, 1000) {
        public void onTick(long millisUntilFinished) {
            long seconds = millisUntilFinished / 1000;
            String time = String.format("%02d:%02d", (seconds % 3600) / 60, (seconds % 60));

            Intent i = new Intent("COUNTDOWN_UPDATED");
            i.putExtra("countdown",time);

            sendBroadcast(i);
            //coundownTimer.setTitle(millisUntilFinished / 1000);

        }

        public void onFinish() {
            //coundownTimer.setTitle("Sedned!");
            Intent i = new Intent("COUNTDOWN_UPDATED");
            i.putExtra("countdown","Sent!");

            sendBroadcast(i);
            //Log.d("COUNTDOWN", "FINISH!");
            stopSelf();

        }
    };

    Count.start();
    return START_STICKY;
}

@Override
public IBinder onBind(Intent arg0) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public void onDestroy() {
    Count.cancel();
    super.onDestroy();
}}

这是您要更新TextView的活动中需要的必要代码：

startService(new Intent(context, CountDownTimerService.class));
registerReceiver(uiUpdated, new IntentFilter("COUNTDOWN_UPDATED"));
//Log.d("SERVICE", "STARTED!");


private BroadcastReceiver uiUpdated = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
         //This is the part where I get the timer value from the service and I update it every second, because I send the data from the service every second. The coundtdownTimer is a MenuItem
        countdownTimer.setTitle(intent.getExtras().getString("countdown"));

    }
};

希望这有帮助。