There are lots of reasons why detecting if application is on foreground. for example - as a trigger to GCM/C2DM push notification - lot's of apps would have good reason implementing different behav...

I would like to use Room with LiveData, and in other projects I already used it, but in this one, I can not get it to work. It can't convert my activity into Lifecycle activity when I try to observ...

I am little confused between the life cycle of two activities. Suppose I have Activity A and Activity B. B is called From A i.e A ----> B. Now currently B is on the screen and I pressed back ...

onPause() should be used to save persistent data and onSaveInstanceState(Bundle) is typically used to save non-persistent data.What does that mean?What is difference between persistent and non-pers...

I am trying the new Android P Developer Preview, and the secenario is as follows: I call Activity B from Activity A with startActivityForResult Finish Activity B with SetResult and go back to A...

All activities in my application require a user to be logged-in to view. Users can log out from almost any activity. This is a requirement of the application. At any point if the user logs-out, I w...

I am currently trying to monitor applications being launched and closed under Android. I need to create Android Service app that accumulate statistics (Time, AppName) about starting and terminating...

Every time I pause my activity (actually Fragment) to go to another app, upon returning with onResume I try to resume the video playing but it does not play: I get a blank screen. Upon investigatio...

Android doc say: "When the system, rather than the user, shuts down an activity to conserve memory, ... " But how to simulate this situation?I want to debug the onRestoreInstanceState(Bundle) ...

I had an Activity that extended AppCompactActivity, and in onCreate method I setted the Toolbar using setSupportActionBar method in the usual way: public class StepMasterActivity extends AppCompat...

I would like to test out onSaveInstanceState and onRestoreInstanceState for my app on the emulator. I have found this, which says that we could simulate this during orientation change, but I'm sto...

I found a few articles talking about how RxJava/RxAndroid can replace event busses (such as otto) https://lorentzos.com/rxjava-as-event-bus-the-right-way-10a36bdd49ba#.7a4619qva https://medium.co...

I am a beginner with Android. In Android, some generic elements can be automatically saved/restored in onSaveInstanceState/onRestoreInstanceState. For example, an EditText saves/restores the Text...

I have set locked orientation and added the sample code with 2 simple classes like below: SplashLandscapeActivity.java public class SplashLandscapeActivity extends AppCompatActivity { @Override ...

This is about POST-honeycomb (i.e., Android 3.0+) and the quotes below come from https://developer.android.com/reference/android/app/Activity.html According to the lifecycle, onStop and onDestroy ...

(Yes, I've already looked at existing questions related to this problem.) I am calling finish() from my Activity's Up button listener. But although onDestroy() does get around to being called, fir...

In my Android app I have two activities: DemoActivity with a button to start the SearchActivity with an Intent SearchActivity The button is a custom ViewGroup: SearchButton As soon as the S...

I have two activities: Activity A - list of items Activity B - detail view of an item Normally, a user opens the app and Activity A is launched. A user sees a list of items, clicks one, and Activ...

I am animating a view in an activity after onGlobalLayoutFinished is called on the view. My animation is skipping ~300 ms worth of frames in the beginning. If I delay the animation by more than ~30...

I am trying to make our video app to support Android N multiwindow mode. I have discovered that activity lifecycle becomes confused in multiwindow mode. The phenomenon is when our app layouts on th...

It is unclear (to me, at least) from the documentation whether Activity.onStop is guaranteed to be called. There are two places with seemingly contradictory information. Javadoc for Activity.onSt...

I have an activity that needs to turn screen on(if offed) when it is started. So in onCreate, I have: this.getWindow().setFlags( WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.La...

What method should I use to move my app to background and then move it to foreground again? I tried using moveTaskToBack(true) and the activity is moved to background successfully but then I can't ...

I have a problem with activity launching in my project. My 'Home' activity (H) allows to choose some service in it. Lets say S11->...-> S1n is an activity flow for the service (S1). H is the LAUNC...

I'm at an impasse. I'm using Dagger 2 for dependency injection, but I'm losing state when the app goes into the background. Here is the scenario: the app starts up and creates the dependencies. All...