Question

我有这项服务，只要所述服务也启动，它就会启动一个计时器。该想法是，如果用户手动打开屏幕（即，应用程序进入“计数器”BroadcastReceiver），则计时器被取消。否则，如果计时器自行完成，服务将自动停止（当然是通过onDestroy）。

当我想重启服务时，我的问题就出来了，没有杀死应用程序。第一。如果我只输入新的秒数并启动服务，则会收到以下错误：java.lang.IllegalStateException: Timer was canceled

我怎样摆脱上述问题？

MainService：

public class MainService extends Service {

static String BROADCAST_ACTION = "com.example.vladpintea.friendsbeforecents.displayevent";
Handler handler = new Handler();
Intent intentForStars;

String usedTimer;
long interval;

TimerTask myTask = new TimerTask() { public void run() { stopSelf(); } };
Timer myTimer = new Timer();

@Override
public void onCreate() {
    Toast.makeText(MainService.this, "Service, Created", Toast.LENGTH_SHORT).show();

    intentForStars = new Intent(BROADCAST_ACTION);

    registerReceiver(counter, new IntentFilter(Intent.ACTION_SCREEN_ON));
}

private BroadcastReceiver counter = new BroadcastReceiver() {
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public void onReceive(Context context, Intent intent) {
        myTimer.cancel();

        NotificationManager notify_manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Intent intent_main_activity = new Intent(context, MainActivity.class);
        PendingIntent pending_intent_main_activity = PendingIntent.getActivity(context, 0,
                intent_main_activity, 0);
        Notification notification_popup = new Notification.Builder(context)
                .setContentTitle("Friends Before Cents")
                .setContentText("Oh, no! You've Lost. Try Again?")
                .setSmallIcon(R.mipmap.ic_sentiment_very_dissatisfied_white_48dp)
                .setContentIntent(pending_intent_main_activity)
                .setAutoCancel(true)
                .build();
        notify_manager.notify(0, notification_popup);

        Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT, 30000);
    }
};

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Toast.makeText(MainService.this, "Service, Started", Toast.LENGTH_SHORT).show();

    try { usedTimer = intent.getStringExtra("timer"); } catch (NullPointerException ignored) {}
    try { interval = Long.parseLong(usedTimer); } catch (NumberFormatException ignored) {}
    myTimer.schedule(myTask, interval * 1000);

    handler.removeCallbacks(sendUpdatesToUI);
    handler.postDelayed(sendUpdatesToUI, 1000);

    return super.onStartCommand(intent, flags, startId);
}

private Runnable sendUpdatesToUI = new Runnable() {
    public void run() { handler.postDelayed(this, 1000); }
};

public void addStars() { sendBroadcast(intentForStars); }

@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
public void onDestroy() {
    unregisterReceiver(counter);

    PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
    PowerManager.WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK
            | PowerManager.ACQUIRE_CAUSES_WAKEUP
            | PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
    wakeLock.acquire();

    Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT, 30000);

    NotificationManager notify_manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    Intent intent_main_activity = new Intent(this.getApplicationContext(), MainActivity.class);
    PendingIntent pending_intent_main_activity = PendingIntent.getActivity(this, 0,
            intent_main_activity, 0);
    Notification notification_popup = new Notification.Builder(this)
            .setContentTitle("Friends Before Cents")
            .setContentText("Congrats! You've Won Some Coins.")
            .setSmallIcon(R.mipmap.ic_sentiment_very_satisfied_white_48dp)
            .setContentIntent(pending_intent_main_activity)
            .setAutoCancel(true)
            .build();
    notify_manager.notify(0, notification_popup);

    addStars();
}

@Override
public IBinder onBind(Intent intent) { return null; }

Answer 1

你不能，Doc引用说明一旦取消你就需要创建一个新实例......

Doc：

请注意，从a的run方法中调用此方法重复计时器任务绝对保证计时器任务将不要再跑了。

所以基本上取消后你需要一个新一个......

取消后，如何重新启动计时器？

1 个答案: