I was trying to implement splash screen in android by adding time for which the splash screen is to be shown.
Whenever I close the app by pressing the back button it destroys the activity. If one open the app again from the recent screen it shows the splash screen, but it leads to bad user experience(as they are annoyed by seeing the splash screen again and again, it should only be shown when the user swip of the app from recent screen).
So I thought of adding onPause() and onStop() method inside onBackPressed() method but then the app is never destroyed(i.e. onDestroy isnever called).
How to solve this issue?
Here is the chunk of surprise:
None of the Activity Life-cycle Methods will be called when the app is swiped off
Swiping the app means killing the process of the app and hence it's dead. That's it.
Only onStop() will be called when we press the Recent App button near the Home button.
To implement SplashScreen to appear only for the first time, you can use Shared Preferences and maintain a data as this data will be in your app until the app is uninstalled.
Any other doubts regarding this, please post in comment. We will be happy to help.
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I searched on stackoverflow, people have different opinions, so I hope your answer can refer me to some source that I can believe.
What activity lifecycle methods will be called when you click on recent button when the app is in resumed state (running in foreground and interacting with user) ?
When you click on recent button onPause() will be called for current app.if you open different app from recent screen ,onRestart()-->onStart()-->onResume() will be called first then if the recently selected app covers entire screen, onStop() called for previous app.
When you click on recent button onPause() will be called for current app,if you select same app after click on recent button, onResume() called again for same app.
look at here to know more about lifecycle
I have an issue where I want to differentiate between an activity being stopped because the user wants to navigate back (staying active within my app), or putting my app into the background (switching to the home screen or another app).
Is there any way to tell during onPause or onStop which of the two is the case?
Android studio home button problem.
I have so many activities, when I press home buttom in any activities.
Then if I restart my app.
it started from splash activity(logo activity).
However, I want to start this from activity where I pressed home button.
Can anybody figure this out?
By default, Android handles this behavior. When you press the home button, the app should go to background and at the next time when you open it, it should start from where you left off. But, Android's memory management is designed to automatically terminate minimized apps that have not been accessed in a while when memory is needed for newly launched apps.
If there is enough memory available and still your app gets terminated, that means you are not using the API's correctly. Please read this [article] to know how to handle onPause() and onResume() to achieve this behavior.
I have made an app.
When I launch that app in the normal way, then it works fine. When I press the home button, the app is paused and is still there as it should be.
Now I want to start my app by an intent...so e.g. when a NFC tag is detected the app should launch. This also works, but when I am pressing the home button then the app disappears, but I would like that it stays open (in pause mode) like when I launch it in the "normal wayy". Does anyone know why this can happen? My observation is that the onStop() function is called but not the onDestroy() function. Therefore it is very strange that the app just "disappears".
Thanks a lot in advance.
Please see Android Activity Lifecycle. onDestroy() is not always called when application goes to background and generally here are no guarantee that onDestory() will be called before app/activity is killed.
Could you please explain what you mean 'pause mode'? You mean that app saves the state?
What exactly happens when I press home button in Android?
Because when I open it again after home button pressed, it has series of bugs.
I need to know it to track down the point that causes that bugs.
UPDATE:
when pressing home button, application goes to background and onPause() is called and saves the state of UI, however it does not save state of application, like variables, custom views. And you have to save them manually, as Oren explained.
When you press Home Button your Application/Activity goes in background and when you open it again it resume from the same position as it was until it was being killed/closed by the OS.
Activity Life Cycle will give you a clear idea about it.
Technichally? Anything can happen, from just onPause being called, to the device killing the app to free up memory, to the user shutting down and restarting the device. Your app should handle all of these possibilities.
Further reading : android activity lifecycle