Android 在输入秒数后尝试停止服务

我需要做的是创建一个应用程序，在用户输入秒数并按下按钮后，服务启动，屏幕关闭。仅在经过相应的秒数后，屏幕才会打开并停止服务

目前，无论我输入什么，服务都会停止。你知道为什么吗

主活动（已截断）：

主要服务：

    public class MainService extends Service {

    String usedTimer;
    long interval;

    TimerTask myTask = new TimerTask() {
        public void run() {
            stopSelf();
        }
    }; //TimerTask that will cause the run() runnable to happen.
    Timer myTimer = new Timer(); //Timer that will make the runnable run.

    private static final String TAG = "HelloService";
    private boolean isRunning  = false;

    @Override
    public void onCreate() {
        registerReceiver(counter, new IntentFilter(Intent.ACTION_SCREEN_ON));
        myTimer.schedule(myTask, interval);

        Log.i(TAG, "Service, onCreate");
        Toast.makeText(MainService.this, "Service, Created", Toast.LENGTH_SHORT).show();

        isRunning = true;
    }

    private BroadcastReceiver counter = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(MainService.this, "Whoops! You've Lost.", Toast.LENGTH_SHORT).show();
        }
    };

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        usedTimer = intent.getStringExtra("timer");

        try {
            interval = Long.parseLong(usedTimer);
        } catch(NumberFormatException nfe) {
            System.out.println("NumberFormatException: " + nfe.getMessage());
        }

        Log.i(TAG, "Service, onStartCommand");
        Toast.makeText(MainService.this, usedTimer, Toast.LENGTH_SHORT).show();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        Log.i(TAG, "Service, onDestroy");

        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);

        android.os.Process.killProcess(android.os.Process.myPid());
    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.i(TAG, "Service, onBind");
        return null;
    }
}

---

因为这一行:

myTimer.schedule(myTask, interval);

在此阶段，

interval

尚未初始化，因为在

onStartCommand（）

之前调用了

onCreate（）

阿法克：

Intent i = new Intent(this, YourService.class) // onCreate() called
startService(i); // onStartCommand() called

---

因为这一行:

myTimer.schedule(myTask, interval);

在此阶段，

interval

尚未初始化，因为在

onStartCommand（）

之前调用了

onCreate（）

阿法克：

Intent i = new Intent(this, YourService.class) // onCreate() called
startService(i); // onStartCommand() called

---

对非常感谢。我所做的只是将“myTimer.schedule（myTask，interval）；”从onCreate移动到onStartCommand，就在“Toast.makeText（MainService.this，usedTimer，Toast.LENGTH_SHORT.）show（）的下方！非常感谢。我所做的只是将“myTimer.schedule（myTask，interval）；”从onCreate移动到onStartCommand，就在“Toast.makeText（MainService.this，usedTimer，Toast.LENGTH_SHORT）.show（）下面。”