Android onsaveinstancestate not called It shows up in my activity, great. While in the game, for sure it is needed to go back and forth from Score to Bingo. The activity that contains the fragment has a portrait layout in /res/layout/, and an al As stated by @prom85 in the comments below it's not guaranteed that the onSaveInstanceState method will be called because it's not part of the lifecycle. Note that onSaveInstanceState and onRestoreInstanceState are not guaranteed to be called together. However, there are cases where onSaveInstanceState is called but the activity is not destroyed and as a result onRestoreInstanceState is not invoked. Fragment. The android. You’ll notice that onSaveInstanceState would be called similar to how it would be Oct 9, 2014 · It will be called when the user changes configuration (e. May 7, 2025 · I have a fragment which has its own state (selected buttons, etc). With the help of bundles Feb 10, 2025 · Note: onSaveInstanceState() is not called when the user explicitly closes the activity or in other cases when finish() is called. Java is by value, not by reference. onRestoreInstanceState will be called only if activity is was killed by the system previously. So onSaveInstanceState gets called on the Fragment when its parent Activity has onSaveInstanceState called. Case 3: EditText with android:id assigned <== EditText's text would be retained. Jun 5, 2015 · The later version of Android called onSaveInstanceState much later in the process. PersistableBundle passed in will be saved and presented in #onCreate(Bundle, PersistableBundle) the first time that this activity is restarted following the next device reboot. Sep 12, 2022 · The onSaveInstanceState not called again after leave/resume app and navigate from nested navigation target. That state is lost on a screen rotation. onSaveInstanceState()) } In my Fragment, I can see the saved state exists after device rotation. When pausing the activity (using the back button), the onSaveInstanceState is never called, and consequently, savedInstanceState is always null within the onCreate method upon resuming the app. If you want to save information and retrieve it later, just override onSaveInstanceState and put your info in the bundle. Sep 29, 2021 · In simple terms, this method is used to restore state which is saved using onSaveInstanceState (). Mar 28, 2014 · "In a Fragment, all of their lifecycle callbacks are directly tied to their parent Activity. android. But, before onDestroy() is called, onSaveInstanceState() should be called. If you don't call super. Feb 18, 2015 · Android View onSaveInstanceState not called. From the user’s point of view, the transaction will appear to be lost, resulting in accidental UI state loss. Thus I believe there is a maximum size Bundle that you can save in onSaveInstanceState(), which is not documented. apply { putInt("selectedTabPosition", tabLayout. How can I save my progress bar state, please share. Bundle). , rotates the screen), if Android believes that the activity is at risk of being destroyed while still being reachable on the stack, and perhaps a few other cases. Jan 21, 2021 · In one of my custom views I save the state and it's called on device rotation: override fun onSaveInstanceState(): Parcelable = Bundle(). What is wrong? Dec 20, 2013 · Note: Always call the superclass so it can save the view hierarchy state. i. Android : onSaveInstanceState is not being called in FragmentTo Access My Live Chat Page, On Google, Search for "hows tech developer connect"As I promised, I May 28, 2018 · You should not call onSaveInstanceState manually, it is Android Framework's job to do that whenever it is necessary. app. In both cases Activity1's onStop was called after all methods were called on Activity2. " Look at this post: FragmentActivity onSaveInstanceState not getting called Feb 10, 2025 · All Android framework-provided views have their own implementation of onSaveInstanceState() and onRestoreInstanceState(), so you don't have to manage view state within your fragment. The problem that I'm facing right now is the onSaveInstanceState is not called when I tried to "back" from Bingo to Score. It is not supposed to be called then. It will be called in the following conditions: Jan 29, 2014 · So onSaveInstanceState gets called on the Fragment when its parent Activity has onSaveInstanceState called. I could just use the safe operator, but I will have cases where the state isn't saved. Android invokes onSaveInstanceState() when there's a chance the activity might be destroyed. e. By default, the onSaveInstanceState() callback does not fire in this case. It is possible to restore it in onRestoreInstanceState as well, but not very common. Jan 4, 2023 · Let’s recall the hierarchy that is called by Android to save and read the state: there is check if the view has an ID assigned to call onSaveInstanceState() Jul 16, 2022 · Could you explain me, why both of my Android 12 and Android 8 does not call method onSaveInstanceState() class MainActivity : AppCompatActivity() { private lateinit var binding: ActivityMainBi Extend by device; Build apps that give your users seamless experiences from phones to tablets, watches, headsets, and more. May 28, 2018 · I created a custom view, and tried to restore the state automatically on screen rotation (just as EditText restores current input text automatically), but when I see the log, onSaveInstanceState is not called, and only onRestoreInstanceState is called. Is there a particular use-case that the Android developers had in mind that means actually its better that view state is NOT saved when one presses back? Apr 7, 2011 · I save data in on onSaveInstanceState() and then I try to restore the data in onRestoreInstanceState(). Because onSaveInstanceState() is not guaranteed to be called, you should use it only to record the transient state of the activity (the state of the UI) — you should never use it to store persistent data. Jan 27, 2013 · When I removed that from my Bundle, everything else was saved, the onCreate() method was called with the Bundle, and onRestoreInstanceState() was called as well. Jun 28, 2012 · My problem is on managing screen on/off changes: when going off, onSaveInstanceState is called and everything goes well. As I suspected: there is nothing wrong with those two methods. The major part is that I leave the app for a short time so onSaveInstanceState is called for the current Fragment with the current state (e. Aug 20, 2013 · That means when you call FragmentTransaction#commit() after onSaveInstanceState() is called, the transaction won’t be remembered because it was never recorded as part of the Activity’s state in the first place. Note: To ensure proper handling during configuration changes, you should implement onSaveInstanceState() and onRestoreInstanceState() for any custom views that you May 27, 2013 · @DataDino the documentation linked in Arvis's answer shows that the super call passes along the saved instance bundle by calling super last. R. And, onCreate and onStart were NOT always called. Why ? Code: The XML: Jul 6, 2019 · To simplify, at the Score class, there is a button which will start a new activity (Bingo class). putString Dec 6, 2010 · If the activity is beiing killed by the framework to reclaim the memory, then onSaveInstanceState will be called to store the state of the app. Viewed 7k times Part of Mobile Jun 8, 2017 · Android calls onSaveInstanceState() before the activity becomes vulnerable to being destroyed by the system, but does not bother calling it when the instance is actually being destroyed by a user action (such as pressing the BACK key) so you call multiple layouts on the same activity may not cause the above situation What am I saying is that if onSaveInstanceState is called it does not guarantee that you will receive the bundle. For some reason or another (copy paste, default setting), i had the tag noHistory marked as true for my activity. Jul 18, 2019 · View的onSaveInstanceState和onRestoreInstanceState. Since onSaveInstanceState() is not guaranteed to be called. from : onSaveInstanceState and onRestoreInstanceState () Sep 5, 2021 · 文章浏览阅读8. More information at Android: onSaveInstanceState not being called from activity Oct 6, 2014 · When using the Back button to leave the application the onSaveInstanceState method is not called by the Android system, this is expected system behavior. onSaveInstanceState() get called. – Jul 17, 2017 · onSaveInstanceState() is called during configuration changes and when the activity goes into the background; in both of these cases you actually do not need to reload or process the data if you There are many situations where a fragment may be mostly torn down (such as when placed on the back stack with no UI showing), but its state will not be saved until its owning activity actually needs to save its state. If this method is not being called as expected, understanding why is vital to maintaining your app's state correctly. if your activity was NOT killed during the period when other activity was in front onRestoreInstanceState() will NOT be called because your activity is pretty much "alive". com In an Android application, the onSaveInstanceState method is crucial for saving instance state data when there is a configuration change, like a screen rotation. Apr 29, 2023 · A screenshot of the logcat output when closing the app using the back button on an emulator running Android 12. Then I navigation to a child May 8, 2012 · when an app loses focus to another app onSaveInstanceState() is called but when you navigate back to your app onRestoreInstanceState() may not be called. Nov 28, 2015 · I am working on an android app where i have different layouts for landscape and portrait I want to save some data while the orientation changes and but I find that the onSaveInstanceState is not called when the orientation is changed, I have also debugged the onDestroy() method and it is calling it but is not calling onSaveInstanceState, what Jul 2, 2018 · As it turns out, the issue was not with which Android version was being used, or how the code was written, the problem was in the manifest file. so you may be lost your data when your device has low Remarks. out. To save persistent data, such as user preferences or data for a database, take appropriate opportunities when your activity is in the foreground. Nov 4, 2010 · However, onRestoreInstanceState was called only when onCreate and onStart were also called. But onRestoreInstanceState() or onCreate() never did. Likewise, after the onResume() method, onSaveInstanceState() method is called first. This is because in the scenario your app process gets . If they are by some circumstances not called, you might actually pass some information using method setArguments() and this information should preserve even if your app is in the background and you need to recreate the fragment again. Nov 9, 2014 · If your app goes to the background, onSaveInstanceState and onRestoreInstanceState are called so you can you them. (at least as far as I can tell) Apr 13, 2020 · An example when onPause() is called and not onSaveInstanceState(Bundle) is when activity B is launched in front of activity A: the system may avoid calling onSaveInstanceState(Bundle) on activity A if it isn't killed during the lifetime of B since the state of the user interface of A will stay intact. Sep 4, 2012 · Note however: this method may be called at any time before onDestroy(). Java documentation for android. attr#persistableMode set to persistAcrossReboots. Sample project and screenrecord attached. It shouldn't create scenarios like this. If you called super first, you'd leave the instance state as a copy of the bundle at the end of procedure call with no data passed to the activity instance. May 30, 2012 · Usually you restore your state in onCreate. Workaround for this is using the onPause lifecycle hook to ensure your data is stored. I setup breakpoint, the method onSaveInstanceState() get called. Here is my steps: start my Activity. In both cases Activity1's onPause was called before any methods were called on Activity2. How can we rely on that When android forces the application to close, onSaveInstanceState is actually NOT called (which is why it's unsafe for storing important application data). os. Dec 30, 2013 · The following figure (from the official doc) describes the well-known lifecycle of an Android activity:. There are many situations where a fragment may be mostly torn down (such as when placed on the back stack with no UI showing), but its state will not be saved until its owning activity actually needs to save its state. From the docs onSaveInstanceState is called ONLY if the Activitys onSaveInstanceState is getting called (which isn't called in my case). It has no more instance state to save. MainActivity" android:noHistory="true"></activity> Feb 13, 2024 · Android provides two methods, OnSaveInstanceState() and OnRestoreInstanceState() which enables developers to restore the state of their app during such configuration changes. They are just not called. have an open dialog). 1k次，点赞5次，收藏23次。1. The Back button finishes your Activity and there is no need to save app state. onSaveInstanceState(outState); then default method will not call. Modified 5 years, 5 months ago. On the Web you can read that 'onRestoreInsatnceState is called when activity is re-created' Ok, it make sens but it's not completely true. onPause, however is guaranteed to be called before the activity is killed, so it should be used to store permanent info in preferences or Squlite. Feb 8, 2023 · OnItemSelectedListener {@Override public void onItemSelected (AdapterView <?> parent, View view, int position, long id) {// get int value anInt = position;} @Override public void onNothingSelected (AdapterView <?> parent) {}});} @Override protected void onSaveInstanceState (@NonNull Bundle outState) {// put string value outState. Lets deep dive into Android : Android: onSaveInstanceState not being called from activityTo Access My Live Chat Page, On Google, Search for "hows tech developer connect"I promis Mar 26, 2015 · Case 1: TextView without android:freezeText=true <== TextView's text would not be retained. (onRestoreInstanceState is called after onStart, whereas onCreate is called before onStart. For more information, see Back tap behavior for root launcher activities. press 'Home' button on the phone. Mar 26, 2018 · onSaveInstanceState(): This method is called before onStop() in older versions of Android and can be called after onStop() for newer versions. Sep 22, 2021 · As you can see, onSaveInstanceState() method is called before the onStop() method. public void onSaveInstanceState(Bundle outState) { super. I am really confused with the internal state of a Fragment. onSaveInstanceState(outState); System. Case 2: TextView with android:freezeText=true (and don't forget to assign android:id as well) <== TextView's text would be retained. May 23, 2014 · After digging in android os I have finally figured it out. saveState(outState); See full list on developer. I have an Activity holding only one Fragment at once and replaces it, if another Fragment should get shown. I did try to use the fragment's onSaveInstanceState method but for some reason it is not called when the fragment's view is destroyed. This is consistent with the documentation for the Activity Lifecycle. Ask Question Asked 10 years, 1 month ago. Dec 12, 2016 · According to android documentation, Before onDestroy is called, onSaveInstanceState (Bundle bundle) will be called, where i do the following. This is the same as #onSaveInstanceState but is called for activities created with the attribute android. Feb 10, 2025 · Note: If the activity is a root launcher activity, the system handles the event differently depending on the version of Android that the device is running. onSaveInstanceState(android. d(TAG, "In onsave"); wv. Read - onSaveInstanceState when click back button in Android Jun 11, 2014 · Is there a particular reason why "onSaveInstanceState" is not called when the "back button" is pressed? It makes sense to me that view state SHOULD be saved when I press the back button. On the other hand, when the activity is destroyed by the system (for example because memory needs to be reclaimed), the state of the activity is sometimes automatically saved and restored by means of the methods onSaveInstanceState() and onRestoreInstanceState(), as illustrated by the Dec 6, 2020 · In Android, onSaveInstanceState() will be called by the system to save the current state of the activity to make sure when users resume the app they will see the activity when they left before (by calling onRestoreInstanceState() to restore the state of activity). The back button is meant to stop your app (Read: activity). Remember that, this callback will be called only if the activity is re opened after it had Feb 10, 2025 · Note: onSaveInstanceState() is not called when the user explicitly closes the activity or in other cases when finish() is called. However, it calls the lifecycle methods to save state just to be safe. println("Saving webview state"); Log. Your Bingo activity instance is being permanently destroyed. It is the case for the parent activity, but not for the fragment I've added. selectedTabPosition) putParcelable("superState", super. g. onSaveInstanceState简介如果系统由于系统约束（而不是正常的应用程序行为）而破坏了Activity，那么尽管实际 Activity实例已经消失，但是系统还是会记住它已经存在，这样如果用户导航回到它，系统会创建一个新的实例的Activity使用一组保存的数据来描述Activity Jul 18, 2017 · Note that onSaveInstanceState() is called when your activity goes into the background and NOT when the app process is about to be killed. 日常的开发过程中难免会自定义一些view，view的状态数据保存及恢复也是需要考虑进内的，就会用到onSaveInstanceState和onRestoreInstanceState这两个方法。 Now, I know that I can use setOffscreeLimit method of the viewpager to say 2 and that will fix my issue, but I want my app to be memory efficient. <activity android:name=". Android : onSaveInstanceState is not getting called after screen rotationTo Access My Live Chat Page, On Google, Search for "hows tech developer connect"I ha May 22, 2024 · The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. On screen on, onRestoreInstanceState is not called, neither onCreate, only onResume. putInt(PLAYER_SCORE, mCurrentScore); savedInstanceState. This behavior assumes the user taps Back static final String PLAYER_SCORE = "playerScore"; static final String PLAYER_LEVEL = "playerLevel"; @Override public void onSaveInstanceState(Bundle savedInstanceState) { // Save the user's current game state savedInstanceState. putInt(PLAYER_LEVEL, mCurrentLevel); // Always call the I add a fragment to a LinearLayout, programmatically. Dec 28, 2013 · I have read the below statement from android document . I turn the device —> configuration changes: everything is destroyed to be recreated. So it seems like Android doesn't always delete the state information even if the Activity moves to the background. 1 @Override 2 protected void onSaveInstanceState Aug 24, 2022 · What does not work as intended is the fact the onSaveInstanceState is called when the view is not there anymore. kqjink gfpg fpgaz hufvnv qjhmileq udavqp aytwf pedyqix own zlr