activity-lifecycle

I have tried to research exactly when the onDestroy method is called for an activity, but I've read some confusing and conflicting information. In general, my question is: under what circumstances is the onDestroy method actually called on an activity? More specifically, if I have two activities, activity A and activity B, if activity A is running and I create an intent and switch to activity B, is activity A only stopped, or is it destroyed? JoaoBiriba Like stated in the official documentation : onDestroy() The final call you receive before your activity is destroyed. This can happen either

I am making my first Socket.io based android application. The socket sends and receives data from a web service. There are a number of screens in the application for different features. How do i use the same socket connection in these different activities. I have tried setting and storing the Socket Object in the Application class and it appears to work well but when the application goes into the background and left there for some time the application is killed and the socket object is then NULL causing the aoo to crash with a null pointer exception. public class MyApplication extends

I have three activity: - SplashActivity - MainActivity - PlayerActivity Of course the app starts with SplashActivity, then it starts MainActivity and closes. MainActivity in some moment starts PlayerActivity and goes to backstack. (MainActivity is alive but is onStop) Then I need open MainActivity and set PlayerActivity to background (PlayerActivity is alive but is onStop). Then I need open PlayerActivity again and set MainActivity to background. So PlayerActivity and MainActivity often gets onPause() and onStop() without onDestroy when app switch one to another and back. I need finish all

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 property, a RatingBar saves/restores the Rating property... I see from some tests but I can't find anything about this in the documentation. How can I know what is saved/restored implicitly, without my intervention? For example, where I can find that the EditText.Text is automatically saved/restored? I specifically don't want test all properties. Edit from JRG answer : https://developer.android.com

I have an Android application which makes requests to my webserver via both a WebView and an HttpClient. I sync cookies between the two using a CookieSyncManager. So far, so good. When my application starts (inside onResume()), I run a piece of logic similar to the following: if ( appHasBeenIdleFor30Minutes() ) { CookieManager cookieManager = CookieManager.getInstance(); cookieManager.removeSessionCookie(); CookieSyncManager.getInstance().sync(); } This correctly resets any session cookies that were set from the user's previous session. My question is: will this behavior happen periodically on

In my application I need to detect whether my application is going to background or is switching to another activity of the same application... I know that I have to use the onPause method... but how can I distinguish the two cases? Thank you! private static boolean isApplicationGoingToBackground(final Context context) { ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); List<RunningTaskInfo> tasks = am.getRunningTasks(1); if (!tasks.isEmpty()) { ComponentName topActivity = tasks.get(0).topActivity; if (!topActivity.getPackageName().equals(context

When I pull down the quick settings drop down menu while my app is opened and in the foreground, are there any callback methods called? I tried a few quicks tests and Activity.onWindowFocusChanged(boolean hasFocus) might work for you. It fires when I drag down quick settings but it will also likely fire for other reasons, like AlertDialogs. onWindowFocusChanged void onWindowFocusChanged (boolean hasFocus) Called when the current Window of the activity gains or loses focus. This is the best indicator of whether this activity is visible to the user. 来源： https://stackoverflow.com/questions

I have a service listening to some events from server. A service has START_STICKY flag that makes him restart when it's killed by OS. When service receive an event i have two scenarios. First, if activity isn't killed i need to send result to local broadcast receiver and update UI. Second, if it's killed by OS i want to recreate it and send data in bundle. But i don't know how to recognize that android killed my activity. onDestroy activity event doesn't come in this situation. @Override public void onComplete(CurrentOrdersResponse response) { if (response == null) { return; } boolean