How to stop old timer

Question

I use timer to schedule some thing to do after time. And when I close my apps, timer alives until work comple. (It is what I want, and I did ). But when I open it again, 2 timer is run (old and new). How to remove old timer when reopen apps. I know my question is difficult to understand. But I hope some one can help me. Thanks

Answer 1

You should call Timer.cancel() when quiting your apps.

Answer 2

You should stop your timer when your activity call onStop.

Checkout the life cycle of an Activity http://developer.android.com/reference/android/app/Activity.html

If your timer is a global variable

@override
public void onStop(){
    super.onStop();
    mTimer.cancel();
}

Well, if you want to save your data after user is closing your form, it is a good idea to use a service. In your Activity onStop() You could save all the form data in a parcelable / serializable model, put that model into the intent service, and then call service with startService(Intent)

@Override
public void onStop(){
    FormData formData = recoverAllMyFormData();
    Intent myServiceIntent = new Intent(this, MyService.class);
    myServiceIntent.putParcelable("INTENT_EXTRA_FORM_DATA", formData);
    startService(myServiceIntent);
    super.onStop();
}

Then, in your Service onStartCommand will be called. I like to use ThreadPoolExecutor to control one thread at a time

//Global variable
private ThreadPoolExecutor storerExecutor = new ThreadPoolExecutor(1, 18, 50, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(10));


@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    final FormData formData = intent.getParcelable("INTENT_EXTRA_FORM_DATA");
    if(formData != null){
        storerExecutor.execute(new Runnable(){
             public void run(){
                  //Use your sqlite code to store the form
             }
        });
    }
    return Service.START_NOT_STICKY;
}

Note: FormData should implement Parcelable

Thats what i can suggest without see your code ;)