Activity restart on rotation Android

Question

In my Android application  when I rotate the device  slide out the keyboard  then my Activity is restarted  onCreate is called   Now  this is probably how it s supposed to be  but I do a lot of initial setting up in the onCreate method  so I need either    Put all the initial setting up in another function so it s not all lost on device rotation or Make it so onCreate is not called again and the layout just adjusts or Limit the app to just portrait so that onCreate is not called

User · Answer

Note  I post this answer if someone in the future face the same problem as me  For me the following line wasn t enought   android configChanges  orientation    When I rotated the screen  the method  onConfigurationChanged Configuration newConfig  did t get called   Solution  I also had to add  screenSize  even if the problem had to do with the orientation  So in the AndroidManifest xml - file  add this   android configChanges  keyboardHidden orientation screenSize    Then implement the method onConfigurationChanged Configuration newConfig

User · Answer

There are multiple ways to do this   Handle orientation changes by yourself  Another alternative is to handle the orientation changes by yourself  But this is not considered a good practice   Add this to your manifest file   android configChanges  keyboardHidden orientation    for Android 3 2 and later   android configChanges  keyboardHidden orientation screenSize    Override public void onConfigurationChanged Configuration config        super onConfigurationChanged config    if  newConfig orientation    Configuration ORIENTATION PORTRAIT              Handle rotation from landscape to portarit mode here       else if  newConfig orientation    Configuration ORIENTATION LANDSCAPE             Handle rotation from portrait to landscape mode here           OR Restrict rotation  You can also confine your activity to portrait or landscape mode to avoid rotation   Add this to the activity tag in your manifest file   android screenOrientation  portrait   Or implement this programmatically in your activity    Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setRequestedOrientation ActivityInfo SCREEN ORIENTATION PORTRAIT       OR Save Activity State  You can save the activity state in onSaveInstanceState    Override public void onSaveInstanceState Bundle outState          Save your data to be restored here     Example   outState putLong  time state   time     time is a long variable       super onSaveInstanceState outState       and then use the bundle to restore the state    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        if savedInstanceState   null            When rotation occurs         Example   time   savedInstanceState getLong  time state   0            else           When onCreate is called for the first time

User · Answer

Even though it is not  the Android way  I have gotten very good results by handling orientation changes myself and simply repositioning the widgets within a view to take the altered orientation into account   This is faster than any other approach  because your views do not have to be saved and restored   It also provides a more seamless experience to the user  because the respositioned widgets are exactly the same widgets  just moved and or resized   Not only model state  but also view state  can be preserved in this manner   RelativeLayout can sometimes be a good choice for a view that has to reorient itself from time to time   You just provide a set of portrait layout params and a set of landscaped layout params  with different relative positioning rules on each  for each child widget   Then  in your onConfigurationChanged   method  you pass the appropriate one to a setLayoutParams   call on each child   If any child control itself needs to be internally reoriented  you just call a method on that child to perform the reorientation   That child similarly calls methods on any of its child controls that need internal reorientation  and so on

User · Answer

Fix the screen orientation  landscape or portrait  in AndroidManifest xml  android screenOrientation  portrait  or android screenOrientation  landscape   for this your onResume   method is not called

User · Answer

Changes to be made in the Android manifest are   android configChanges  keyboardHidden orientation     Additions to be made inside activity are   public void onConfigurationChanged Configuration newConfig        super onConfigurationChanged newConfig           Checks the orientation of the screen     if  newConfig orientation    Configuration ORIENTATION LANDSCAPE            Toast makeText this   landscape   Toast LENGTH SHORT  show          else if  newConfig orientation    Configuration ORIENTATION PORTRAIT            Toast makeText this   portrait   Toast LENGTH SHORT  show

User · Answer

One of the best component of android architechure introduce by google will fulfill your all the requirement that is ViewModel   That is designed to store and manage UI related data in lifecycle way plus that will allow data to survive as screen rotates  class MyViewModel   ViewModel       Please refer this https   developer android com topic libraries architecture viewmodel

User · Answer

add this code to your menufests xml    this is your activity    lt activity         android configChanges  orientation screenSize   gt

User · Answer

The approach is useful but is incomplete when using Fragments   Fragments usually get recreated on configuration change  If you don t wish this to happen  use  setRetainInstance true   in the Fragment s constructor s   This will cause fragments to be retained during configuration change   http   developer android com reference android app Fragment html setRetainInstance boolean

User · Answer

onConfigurationChanged is called when the screen rotates     onCreate is no longer called when screen rotates due to manifest  see     android configChanges     What part of the manifest tells it  don t call onCreate      Also  Google s docs say to avoid using android configChanges  except as a last resort      But then the alternate methods they suggest all DO use android configChanges   It has been my experience that the emulator ALWAYS calls onCreate   upon rotation  But the 1-2 devices that I run the same code on    do not   Not sure why there would be any difference

User · Answer

There are several ways to do this   Save Activity State  You can save the activity state in onSaveInstanceState    Override public void onSaveInstanceState Bundle outState          Save your data to be restored here     Example   outState putLong  time state   time     time is a long variable       super onSaveInstanceState outState       and then use the bundle to restore the state    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        if savedInstanceState   null            When rotation occurs         Example   time   savedInstanceState getLong  time state   0            else           When onCreate is called for the first time           Handle orientation changes by yourself  Another alternative is to handle the orientation changes by yourself  But this is not considered a good practice   Add this to your manifest file   android configChanges  keyboardHidden orientation    for Android 3 2 and later   android configChanges  keyboardHidden orientation screenSize    Override public void onConfigurationChanged Configuration config        super onConfigurationChanged config    if  newConfig orientation    Configuration ORIENTATION PORTRAIT              Handle rotation from landscape to portarit mode here       else if  newConfig orientation    Configuration ORIENTATION LANDSCAPE             Handle rotation from portrait to landscape mode here           Restrict rotation  You can also confine your activity to portrait or landscape mode to avoid rotation   Add this to the activity tag in your manifest file           android screenOrientation  portrait    Or implement this programmatically in your activity    Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setRequestedOrientation ActivityInfo SCREEN ORIENTATION PORTRAIT

User · Answer

Instead of trying to stop the onCreate   from being fired altogether  maybe try checking the Bundle savedInstanceState being passed into the event to see if it is null or not    For instance  if I have some logic that should be run when the Activity is truly created  not on every orientation change  I only run that logic in the onCreate   only if the savedInstanceState is null     Otherwise  I still want the layout to redraw properly for the orientation   public void onCreate Bundle savedInstanceState             super onCreate savedInstanceState            setContentView R layout activity game list            if savedInstanceState    null               setupCloudMessaging                  not sure if this is the ultimate answer  but it works for me

User · Answer

You can lock to the current orientation of screen using this code     int currentOrientation  context getResources   getConfiguration   orientation          if  currentOrientation    Configuration ORIENTATION PORTRAIT                  Activity  context  setRequestedOrientation ActivityInfo SCREEN ORIENTATION PORTRAIT             else                 Activity  context   setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE

User · Answer

Instead of trying to stop the onCreate   from being fired altogether  maybe try checking the Bundle savedInstanceState being passed into the event to see if it is null or not    For instance  if I have some logic that should be run when the Activity is truly created  not on every orientation change  I only run that logic in the onCreate   only if the savedInstanceState is null     Otherwise  I still want the layout to redraw properly for the orientation   public void onCreate Bundle savedInstanceState             super onCreate savedInstanceState            setContentView R layout activity game list            if savedInstanceState    null               setupCloudMessaging                  not sure if this is the ultimate answer  but it works for me

User · Answer

Every time when screen is rotated  opened activity is finished and onCreate   is called again   1   You can do one thing save the state of activity when screen is rotated so that  You can recover all old stuff when activity s onCreate   is called again      Refer this  link  2   If you want to prevent restarting of the activity just place following lines in your manifest xml file      lt activity android name   Youractivity    android configChanges  orientation screenSize   gt

User · Answer

What you describe is the default behavior   You have to detect and handle these events yourself by adding   android configChanges   to your manifest and then the changes that you want to handle   So for orientation  you would use   android configChanges  orientation    and for the keyboard being opened or closed you would use   android configChanges  keyboardHidden    If you want to handle both you can just separate them with the pipe command like   android configChanges  keyboardHidden orientation    This will trigger the onConfigurationChanged method in whatever Activity you call   If you override the method you can pass in the new values   Hope this helps

User · Answer

Using the Application Class  Depending on what you re doing in your initialization you could consider creating a new class that extends Application and moving your initialization code into an overridden onCreate method within that class   public class MyApplicationClass extends Application      Override   public void onCreate         super onCreate           TODO Put your application initialization code here          The onCreate in the application class is only called when the entire application is created  so the Activity restarts on orientation or keyboard visibility changes won t trigger it   It s good practice to expose the instance of this class as a singleton and exposing the application variables you re initializing using getters and setters   NOTE  You ll need to specify the name of your new Application class in the manifest for it to be registered and used    lt application     android name  com you yourapp MyApplicationClass    Reacting to Configuration Changes  UPDATE  this is deprecated since API 13  see the recommended alternative   As a further alternative  you can have your application listen for events that would cause a restart     like orientation and keyboard visibility changes     and handle them within your Activity   Start by adding the android configChanges node to your Activity s manifest node    lt activity android name   MyActivity        android configChanges  orientation keyboardHidden        android label   string app name  gt    or for Android 3 2  API level 13  and newer    lt activity android name   MyActivity        android configChanges  keyboardHidden orientation screenSize        android label   string app name  gt    Then within the Activity override the onConfigurationChanged method and call setContentView to force the GUI layout to be re-done in the new orientation    Override public void onConfigurationChanged Configuration newConfig      super onConfigurationChanged newConfig     setContentView R layout myLayout

User · Answer

you need to use the onSavedInstanceState method to store all the value to its parameter is has that is bundle    Override     public void onSaveInstanceState Bundle outState  PersistableBundle outPersistentState            super onSaveInstanceState outState  outPersistentState           outPersistentState putBoolean  key  value           and use    Override     protected void onRestoreInstanceState Bundle savedInstanceState            super onRestoreInstanceState savedInstanceState           savedInstanceState getBoolean  key             to retrive and set the value to view objects it will handles the screen rotations

User · Answer

It is very simple just do the following steps    lt activity     android name   Test      android configChanges  orientation screenSize      android screenOrientation  landscape   gt   lt  activity gt    This works for me    Note  orientation depends on your requitement

User · Answer

The way I have found to do this is use the onRestoreInstanceState and the onSaveInstanceState events to save something in the Bundle  even if you dont need any variables saved  just put something in there so the Bundle isn t empty   Then  on the onCreate method  check to see if the Bundle is empty  and if it is  then do the initialization  if not  then do it

User · Answer

In the activity section of the manifest  add   android configChanges  keyboardHidden orientation

User · Answer

The approach is useful but is incomplete when using Fragments   Fragments usually get recreated on configuration change  If you don t wish this to happen  use  setRetainInstance true   in the Fragment s constructor s   This will cause fragments to be retained during configuration change   http   developer android com reference android app Fragment html setRetainInstance boolean

User · Answer

Using the Application Class  Depending on what you re doing in your initialization you could consider creating a new class that extends Application and moving your initialization code into an overridden onCreate method within that class   public class MyApplicationClass extends Application      Override   public void onCreate         super onCreate           TODO Put your application initialization code here          The onCreate in the application class is only called when the entire application is created  so the Activity restarts on orientation or keyboard visibility changes won t trigger it   It s good practice to expose the instance of this class as a singleton and exposing the application variables you re initializing using getters and setters   NOTE  You ll need to specify the name of your new Application class in the manifest for it to be registered and used    lt application     android name  com you yourapp MyApplicationClass    Reacting to Configuration Changes  UPDATE  this is deprecated since API 13  see the recommended alternative   As a further alternative  you can have your application listen for events that would cause a restart     like orientation and keyboard visibility changes     and handle them within your Activity   Start by adding the android configChanges node to your Activity s manifest node    lt activity android name   MyActivity        android configChanges  orientation keyboardHidden        android label   string app name  gt    or for Android 3 2  API level 13  and newer    lt activity android name   MyActivity        android configChanges  keyboardHidden orientation screenSize        android label   string app name  gt    Then within the Activity override the onConfigurationChanged method and call setContentView to force the GUI layout to be re-done in the new orientation    Override public void onConfigurationChanged Configuration newConfig      super onConfigurationChanged newConfig     setContentView R layout myLayout

User · Answer

People are saying that you should use   android configChanges  keyboardHidden orientation    But the best and most professional way to handle rotation in Android is to use the Loader class  It s not a famous class I don t know why   but it is way better than the AsyncTask  For more information  you can read the Android tutorials found in Udacity s Android courses    Of course  as another way  you could store the values or the views with onSaveInstanceState and read them with onRestoreInstanceState  It s up to you really

User · Answer

It is very simple just do the following steps    lt activity     android name   Test      android configChanges  orientation screenSize      android screenOrientation  landscape   gt   lt  activity gt    This works for me    Note  orientation depends on your requitement

User · Answer

What you describe is the default behavior   You have to detect and handle these events yourself by adding   android configChanges   to your manifest and then the changes that you want to handle   So for orientation  you would use   android configChanges  orientation    and for the keyboard being opened or closed you would use   android configChanges  keyboardHidden    If you want to handle both you can just separate them with the pipe command like   android configChanges  keyboardHidden orientation    This will trigger the onConfigurationChanged method in whatever Activity you call   If you override the method you can pass in the new values   Hope this helps

User · Answer

You may use ViewModel object in your activity   ViewModel objects are automatically retained during configuration changes so that data they hold is immediately available to the next activity or fragment instance  Read more   https   developer android com topic libraries architecture viewmodel

User · Answer

Add this line to your manifest  -   android configChanges  orientation keyboard keyboardHidden screenSize screenLayout uiMode    and this snippet to the activity  -   Override     public void onConfigurationChanged Configuration newConfig            super onConfigurationChanged newConfig           getWindow   setFlags WindowManager LayoutParams FLAG FULLSCREEN                  WindowManager LayoutParams FLAG FULLSCREEN

User · Answer

The way I have found to do this is use the onRestoreInstanceState and the onSaveInstanceState events to save something in the Bundle  even if you dont need any variables saved  just put something in there so the Bundle isn t empty   Then  on the onCreate method  check to see if the Bundle is empty  and if it is  then do the initialization  if not  then do it

User · Answer

There are multiple ways to do this   Handle orientation changes by yourself  Another alternative is to handle the orientation changes by yourself  But this is not considered a good practice   Add this to your manifest file   android configChanges  keyboardHidden orientation    for Android 3 2 and later   android configChanges  keyboardHidden orientation screenSize    Override public void onConfigurationChanged Configuration config        super onConfigurationChanged config    if  newConfig orientation    Configuration ORIENTATION PORTRAIT              Handle rotation from landscape to portarit mode here       else if  newConfig orientation    Configuration ORIENTATION LANDSCAPE             Handle rotation from portrait to landscape mode here           OR Restrict rotation  You can also confine your activity to portrait or landscape mode to avoid rotation   Add this to the activity tag in your manifest file   android screenOrientation  portrait   Or implement this programmatically in your activity    Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setRequestedOrientation ActivityInfo SCREEN ORIENTATION PORTRAIT       OR Save Activity State  You can save the activity state in onSaveInstanceState    Override public void onSaveInstanceState Bundle outState          Save your data to be restored here     Example   outState putLong  time state   time     time is a long variable       super onSaveInstanceState outState       and then use the bundle to restore the state    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        if savedInstanceState   null            When rotation occurs         Example   time   savedInstanceState getLong  time state   0            else           When onCreate is called for the first time

User · Answer

Put this below code in your Activity in Android Manifest   android configChanges  orientation    This will not restart your activity when you would change orientation

User · Answer

what I did     in the manifest  to the activity section  added   android configChanges  keyboardHidden orientation    in the code for the activity  implemented     used in onCreate   and onConfigurationChanged   to set up the UI elements public void InitializeUI           get views from ID s     this textViewHeaderMainMessage    TextView  this findViewById R id TextViewHeaderMainMessage          etc    hook up click listeners  whatever you need from the Views      Called when the activity is first created   Override public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout main        InitializeUI         this is called when the screen rotates      onCreate is no longer called when screen rotates due to manifest  see  android configChanges   Override public void onConfigurationChanged Configuration newConfig        super onConfigurationChanged newConfig       setContentView R layout main        InitializeUI

User · Answer

Note  I post this answer if someone in the future face the same problem as me  For me the following line wasn t enought   android configChanges  orientation    When I rotated the screen  the method  onConfigurationChanged Configuration newConfig  did t get called   Solution  I also had to add  screenSize  even if the problem had to do with the orientation  So in the AndroidManifest xml - file  add this   android configChanges  keyboardHidden orientation screenSize    Then implement the method onConfigurationChanged Configuration newConfig

User · Answer

The onCreate method is still called even when you change the orientation of android  So moving all the heavy functionality to this method is not going to help you

User · Answer

Add this line in manifest   android configChanges  orientation screenSize

User · Answer

You can lock to the current orientation of screen using this code     int currentOrientation  context getResources   getConfiguration   orientation          if  currentOrientation    Configuration ORIENTATION PORTRAIT                  Activity  context  setRequestedOrientation ActivityInfo SCREEN ORIENTATION PORTRAIT             else                 Activity  context   setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE

User · Answer

People are saying that you should use   android configChanges  keyboardHidden orientation    But the best and most professional way to handle rotation in Android is to use the Loader class  It s not a famous class I don t know why   but it is way better than the AsyncTask  For more information  you can read the Android tutorials found in Udacity s Android courses    Of course  as another way  you could store the values or the views with onSaveInstanceState and read them with onRestoreInstanceState  It s up to you really

User · Answer

The onCreate method is still called even when you change the orientation of android  So moving all the heavy functionality to this method is not going to help you

User · Answer

After a while of trial and error  I found a solution which fits my needs in the most situations  Here is the Code   Manifest configuration    lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android            package  com pepperonas myapplication  gt        lt application         android name   App          android allowBackup  true          android icon   mipmap ic launcher          android label   string app name          android supportsRtl  true          android theme   style AppTheme  gt           lt activity             android name   MainActivity              android configChanges  orientation keyboardHidden screenSize  gt               lt intent-filter gt                   lt action android name  android intent action MAIN   gt                    lt category android name  android intent category LAUNCHER   gt               lt  intent-filter gt           lt  activity gt       lt  application gt    lt  manifest gt    MainActivity   import android content res Configuration  import android os Bundle  import android support v4 app Fragment  import android support v4 app FragmentManager  import android support v4 app FragmentTransaction  import android support v7 app AppCompatActivity  import android util Log  import android view View  import android widget Button   public class MainActivity extends AppCompatActivity implements View OnClickListener        private static final String TAG    MainActivity        private Fragment mFragment       private int mSelected   -1         Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           Log d TAG   onCreate                       null check not realy needed - but just in case            if  savedInstanceState    null                 initUi                    get an instance of FragmentTransaction from your Activity             FragmentManager fragmentManager   getSupportFragmentManager                FragmentTransaction fragmentTransaction   fragmentManager beginTransaction                   IMPORTANT  Do the INITIAL    transaction only once                If we call this everytime the layout changes orientation                we will end with a messy  half-working UI                               mFragment   FragmentOne newInstance mSelected   0               fragmentTransaction add R id frame  mFragment               fragmentTransaction commit                           Override     public void onConfigurationChanged Configuration newConfig            super onConfigurationChanged newConfig           Log d TAG   onConfigurationChanged                          newConfig orientation                        Configuration ORIENTATION LANDSCAPE                        landscape     portrait              initUi             Log i TAG   onConfigurationChanged - last selected      mSelected           makeFragmentTransaction mSelected                          Called from   link  onCreate  and   link  onConfigurationChanged              private void initUi             setContentView R layout activity main           Log d TAG   onCreate  instanceState    null   reinitializing                    Button btnFragmentOne    Button  findViewById R id btn fragment one           Button btnFragmentTwo    Button  findViewById R id btn fragment two           btnFragmentOne setOnClickListener this           btnFragmentTwo setOnClickListener this                          Not invoked  just for testing                  Override     protected void onSaveInstanceState Bundle outState            super onSaveInstanceState outState           Log d TAG   onSaveInstanceState       YOU WON T SEE ME                              Not invoked  just for testing                  Override     protected void onRestoreInstanceState Bundle savedInstanceState            super onRestoreInstanceState savedInstanceState           Log d TAG   onSaveInstanceState       YOU WON T SEE ME  AS WELL                    Override     protected void onResume             super onResume            Log d TAG   onResume                        Override     protected void onPause             super onPause            Log d TAG   onPause                        Override     protected void onDestroy             super onDestroy            Log d TAG   onDestroy                        Override     public void onClick View v             switch  v getId                  case R id btn fragment one                  Log d TAG   onClick btn fragment one                          makeFragmentTransaction 0                   break               case R id btn fragment two                  Log d TAG   onClick btn fragment two                          makeFragmentTransaction 1                   break               default                  Log d TAG   onClick  null - wtf                                            We replace the current Fragment with the selected one         Note  It s called from   link  onConfigurationChanged  as well              private void makeFragmentTransaction int selection             switch  selection                case 0                  mFragment   FragmentOne newInstance mSelected   0                   break              case 1                  mFragment   FragmentTwo newInstance mSelected   1                   break                        Create new transaction         FragmentTransaction transaction   getSupportFragmentManager   beginTransaction                Replace whatever is in the fragment container view with this fragment             and add the transaction to the back stack         transaction replace R id frame  mFragment              This would add the Fragment to the backstack              But right now we comment it out                      transaction addToBackStack null               Commit the transaction         transaction commit               And sample Fragment   import android os Bundle  import android support v4 app Fragment  import android util Log  import android view LayoutInflater  import android view View  import android view ViewGroup           author Martin Pfeffer  pepperonas      public class FragmentOne extends Fragment        private static final String TAG    FragmentOne         public static Fragment newInstance int i            Fragment fragment   new FragmentOne            Bundle args   new Bundle            args putInt  the id   i           fragment setArguments args           return fragment               Override     public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            Log d TAG   onCreateView                   return inflater inflate R layout fragment one  container  false              Can be found on github

User · Answer

Add this line to your manifest  -   android configChanges  orientation keyboard keyboardHidden screenSize screenLayout uiMode    and this snippet to the activity  -   Override     public void onConfigurationChanged Configuration newConfig            super onConfigurationChanged newConfig           getWindow   setFlags WindowManager LayoutParams FLAG FULLSCREEN                  WindowManager LayoutParams FLAG FULLSCREEN

User · Answer

Changes to be made in the Android manifest are   android configChanges  keyboardHidden orientation     Additions to be made inside activity are   public void onConfigurationChanged Configuration newConfig        super onConfigurationChanged newConfig           Checks the orientation of the screen     if  newConfig orientation    Configuration ORIENTATION LANDSCAPE            Toast makeText this   landscape   Toast LENGTH SHORT  show          else if  newConfig orientation    Configuration ORIENTATION PORTRAIT            Toast makeText this   portrait   Toast LENGTH SHORT  show

User · Answer

Use orientation listener to perform different tasks on different orientation    Override public void onConfigurationChanged Configuration myConfig         super onConfigurationChanged myConfig       int orient   getResources   getConfiguration   orientation       switch orient                case Configuration ORIENTATION LANDSCAPE            setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE                       break         case Configuration ORIENTATION PORTRAIT            setRequestedOrientation ActivityInfo SCREEN ORIENTATION PORTRAIT                       break         default            setRequestedOrientation ActivityInfo SCREEN ORIENTATION UNSPECIFIED

User · Answer

What you describe is the default behavior   You have to detect and handle these events yourself by adding   android configChanges   to your manifest and then the changes that you want to handle   So for orientation  you would use   android configChanges  orientation    and for the keyboard being opened or closed you would use   android configChanges  keyboardHidden    If you want to handle both you can just separate them with the pipe command like   android configChanges  keyboardHidden orientation    This will trigger the onConfigurationChanged method in whatever Activity you call   If you override the method you can pass in the new values   Hope this helps

User · Answer

In the activity section of the manifest  add   android configChanges  keyboardHidden orientation

User · Answer

Using the Application Class  Depending on what you re doing in your initialization you could consider creating a new class that extends Application and moving your initialization code into an overridden onCreate method within that class   public class MyApplicationClass extends Application      Override   public void onCreate         super onCreate           TODO Put your application initialization code here          The onCreate in the application class is only called when the entire application is created  so the Activity restarts on orientation or keyboard visibility changes won t trigger it   It s good practice to expose the instance of this class as a singleton and exposing the application variables you re initializing using getters and setters   NOTE  You ll need to specify the name of your new Application class in the manifest for it to be registered and used    lt application     android name  com you yourapp MyApplicationClass    Reacting to Configuration Changes  UPDATE  this is deprecated since API 13  see the recommended alternative   As a further alternative  you can have your application listen for events that would cause a restart     like orientation and keyboard visibility changes     and handle them within your Activity   Start by adding the android configChanges node to your Activity s manifest node    lt activity android name   MyActivity        android configChanges  orientation keyboardHidden        android label   string app name  gt    or for Android 3 2  API level 13  and newer    lt activity android name   MyActivity        android configChanges  keyboardHidden orientation screenSize        android label   string app name  gt    Then within the Activity override the onConfigurationChanged method and call setContentView to force the GUI layout to be re-done in the new orientation    Override public void onConfigurationChanged Configuration newConfig      super onConfigurationChanged newConfig     setContentView R layout myLayout

User · Answer

Put this below code in your Activity in Android Manifest   android configChanges  orientation    This will not restart your activity when you would change orientation

User · Answer

I just simply added        android configChanges  keyboard keyboardHidden orientation    in the manifest file and did not add any onConfigurationChanged method in my activity   So every time the keyboard slides out or in nothing happens

User · Answer

you need to use the onSavedInstanceState method to store all the value to its parameter is has that is bundle    Override     public void onSaveInstanceState Bundle outState  PersistableBundle outPersistentState            super onSaveInstanceState outState  outPersistentState           outPersistentState putBoolean  key  value           and use    Override     protected void onRestoreInstanceState Bundle savedInstanceState            super onRestoreInstanceState savedInstanceState           savedInstanceState getBoolean  key             to retrive and set the value to view objects it will handles the screen rotations

User · Answer

onConfigurationChanged is called when the screen rotates     onCreate is no longer called when screen rotates due to manifest  see     android configChanges     What part of the manifest tells it  don t call onCreate      Also  Google s docs say to avoid using android configChanges  except as a last resort      But then the alternate methods they suggest all DO use android configChanges   It has been my experience that the emulator ALWAYS calls onCreate   upon rotation  But the 1-2 devices that I run the same code on    do not   Not sure why there would be any difference

User · Answer

Use orientation listener to perform different tasks on different orientation    Override public void onConfigurationChanged Configuration myConfig         super onConfigurationChanged myConfig       int orient   getResources   getConfiguration   orientation       switch orient                case Configuration ORIENTATION LANDSCAPE            setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE                       break         case Configuration ORIENTATION PORTRAIT            setRequestedOrientation ActivityInfo SCREEN ORIENTATION PORTRAIT                       break         default            setRequestedOrientation ActivityInfo SCREEN ORIENTATION UNSPECIFIED

User · Answer

Every time when screen is rotated  opened activity is finished and onCreate   is called again   1   You can do one thing save the state of activity when screen is rotated so that  You can recover all old stuff when activity s onCreate   is called again      Refer this  link  2   If you want to prevent restarting of the activity just place following lines in your manifest xml file      lt activity android name   Youractivity    android configChanges  orientation screenSize   gt

User · Answer

I just simply added        android configChanges  keyboard keyboardHidden orientation    in the manifest file and did not add any onConfigurationChanged method in my activity   So every time the keyboard slides out or in nothing happens

User · Answer

After a while of trial and error  I found a solution which fits my needs in the most situations  Here is the Code   Manifest configuration    lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android            package  com pepperonas myapplication  gt        lt application         android name   App          android allowBackup  true          android icon   mipmap ic launcher          android label   string app name          android supportsRtl  true          android theme   style AppTheme  gt           lt activity             android name   MainActivity              android configChanges  orientation keyboardHidden screenSize  gt               lt intent-filter gt                   lt action android name  android intent action MAIN   gt                    lt category android name  android intent category LAUNCHER   gt               lt  intent-filter gt           lt  activity gt       lt  application gt    lt  manifest gt    MainActivity   import android content res Configuration  import android os Bundle  import android support v4 app Fragment  import android support v4 app FragmentManager  import android support v4 app FragmentTransaction  import android support v7 app AppCompatActivity  import android util Log  import android view View  import android widget Button   public class MainActivity extends AppCompatActivity implements View OnClickListener        private static final String TAG    MainActivity        private Fragment mFragment       private int mSelected   -1         Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           Log d TAG   onCreate                       null check not realy needed - but just in case            if  savedInstanceState    null                 initUi                    get an instance of FragmentTransaction from your Activity             FragmentManager fragmentManager   getSupportFragmentManager                FragmentTransaction fragmentTransaction   fragmentManager beginTransaction                   IMPORTANT  Do the INITIAL    transaction only once                If we call this everytime the layout changes orientation                we will end with a messy  half-working UI                               mFragment   FragmentOne newInstance mSelected   0               fragmentTransaction add R id frame  mFragment               fragmentTransaction commit                           Override     public void onConfigurationChanged Configuration newConfig            super onConfigurationChanged newConfig           Log d TAG   onConfigurationChanged                          newConfig orientation                        Configuration ORIENTATION LANDSCAPE                        landscape     portrait              initUi             Log i TAG   onConfigurationChanged - last selected      mSelected           makeFragmentTransaction mSelected                          Called from   link  onCreate  and   link  onConfigurationChanged              private void initUi             setContentView R layout activity main           Log d TAG   onCreate  instanceState    null   reinitializing                    Button btnFragmentOne    Button  findViewById R id btn fragment one           Button btnFragmentTwo    Button  findViewById R id btn fragment two           btnFragmentOne setOnClickListener this           btnFragmentTwo setOnClickListener this                          Not invoked  just for testing                  Override     protected void onSaveInstanceState Bundle outState            super onSaveInstanceState outState           Log d TAG   onSaveInstanceState       YOU WON T SEE ME                              Not invoked  just for testing                  Override     protected void onRestoreInstanceState Bundle savedInstanceState            super onRestoreInstanceState savedInstanceState           Log d TAG   onSaveInstanceState       YOU WON T SEE ME  AS WELL                    Override     protected void onResume             super onResume            Log d TAG   onResume                        Override     protected void onPause             super onPause            Log d TAG   onPause                        Override     protected void onDestroy             super onDestroy            Log d TAG   onDestroy                        Override     public void onClick View v             switch  v getId                  case R id btn fragment one                  Log d TAG   onClick btn fragment one                          makeFragmentTransaction 0                   break               case R id btn fragment two                  Log d TAG   onClick btn fragment two                          makeFragmentTransaction 1                   break               default                  Log d TAG   onClick  null - wtf                                            We replace the current Fragment with the selected one         Note  It s called from   link  onConfigurationChanged  as well              private void makeFragmentTransaction int selection             switch  selection                case 0                  mFragment   FragmentOne newInstance mSelected   0                   break              case 1                  mFragment   FragmentTwo newInstance mSelected   1                   break                        Create new transaction         FragmentTransaction transaction   getSupportFragmentManager   beginTransaction                Replace whatever is in the fragment container view with this fragment             and add the transaction to the back stack         transaction replace R id frame  mFragment              This would add the Fragment to the backstack              But right now we comment it out                      transaction addToBackStack null               Commit the transaction         transaction commit               And sample Fragment   import android os Bundle  import android support v4 app Fragment  import android util Log  import android view LayoutInflater  import android view View  import android view ViewGroup           author Martin Pfeffer  pepperonas      public class FragmentOne extends Fragment        private static final String TAG    FragmentOne         public static Fragment newInstance int i            Fragment fragment   new FragmentOne            Bundle args   new Bundle            args putInt  the id   i           fragment setArguments args           return fragment               Override     public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            Log d TAG   onCreateView                   return inflater inflate R layout fragment one  container  false              Can be found on github

User · Answer

add this code to your menufests xml    this is your activity    lt activity         android configChanges  orientation screenSize   gt

User · Answer

What you describe is the default behavior   You have to detect and handle these events yourself by adding   android configChanges   to your manifest and then the changes that you want to handle   So for orientation  you would use   android configChanges  orientation    and for the keyboard being opened or closed you would use   android configChanges  keyboardHidden    If you want to handle both you can just separate them with the pipe command like   android configChanges  keyboardHidden orientation    This will trigger the onConfigurationChanged method in whatever Activity you call   If you override the method you can pass in the new values   Hope this helps

User · Answer

Fix the screen orientation  landscape or portrait  in AndroidManifest xml  android screenOrientation  portrait  or android screenOrientation  landscape   for this your onResume   method is not called

User · Answer

Update for Android 3 2 and higher      Caution  Beginning with Android 3 2  API level 13   the  screen size  also changes when the device switches between portrait and landscape orientation  Thus  if you want to prevent runtime restarts due to orientation change when developing for API level 13 or higher  as declared by the minSdkVersion and targetSdkVersion attributes   you must include the  screenSize  value in addition to the  orientation  value  That is  you must declare android configChanges  orientation screenSize   However  if your application targets API level 12 or lower  then your activity always handles this configuration change itself  this configuration change does not restart your activity  even when running on an Android 3 2 or higher device

User · Answer

One of the best component of android architechure introduce by google will fulfill your all the requirement that is ViewModel   That is designed to store and manage UI related data in lifecycle way plus that will allow data to survive as screen rotates  class MyViewModel   ViewModel       Please refer this https   developer android com topic libraries architecture viewmodel

User · Answer

Put the code below inside your  lt activity gt  tag in Manifest xml   android configChanges  screenLayout screenSize orientation

User · Answer

Put the code below inside your  lt activity gt  tag in Manifest xml   android configChanges  screenLayout screenSize orientation

User · Answer

You may use ViewModel object in your activity   ViewModel objects are automatically retained during configuration changes so that data they hold is immediately available to the next activity or fragment instance  Read more   https   developer android com topic libraries architecture viewmodel

User · Answer

what I did     in the manifest  to the activity section  added   android configChanges  keyboardHidden orientation    in the code for the activity  implemented     used in onCreate   and onConfigurationChanged   to set up the UI elements public void InitializeUI           get views from ID s     this textViewHeaderMainMessage    TextView  this findViewById R id TextViewHeaderMainMessage          etc    hook up click listeners  whatever you need from the Views      Called when the activity is first created   Override public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout main        InitializeUI         this is called when the screen rotates      onCreate is no longer called when screen rotates due to manifest  see  android configChanges   Override public void onConfigurationChanged Configuration newConfig        super onConfigurationChanged newConfig       setContentView R layout main        InitializeUI

User · Answer

There are several ways to do this   Save Activity State  You can save the activity state in onSaveInstanceState    Override public void onSaveInstanceState Bundle outState          Save your data to be restored here     Example   outState putLong  time state   time     time is a long variable       super onSaveInstanceState outState       and then use the bundle to restore the state    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        if savedInstanceState   null            When rotation occurs         Example   time   savedInstanceState getLong  time state   0            else           When onCreate is called for the first time           Handle orientation changes by yourself  Another alternative is to handle the orientation changes by yourself  But this is not considered a good practice   Add this to your manifest file   android configChanges  keyboardHidden orientation    for Android 3 2 and later   android configChanges  keyboardHidden orientation screenSize    Override public void onConfigurationChanged Configuration config        super onConfigurationChanged config    if  newConfig orientation    Configuration ORIENTATION PORTRAIT              Handle rotation from landscape to portarit mode here       else if  newConfig orientation    Configuration ORIENTATION LANDSCAPE             Handle rotation from portrait to landscape mode here           Restrict rotation  You can also confine your activity to portrait or landscape mode to avoid rotation   Add this to the activity tag in your manifest file           android screenOrientation  portrait    Or implement this programmatically in your activity    Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setRequestedOrientation ActivityInfo SCREEN ORIENTATION PORTRAIT

User · Answer

You might also consider using the Android platform s way of persisting data across orientation changes   onRetainNonConfigurationInstance   and getLastNonConfigurationInstance     This allows you to persist data across configuration changes  such as information you may have gotten from a server fetch or something else that s been computed in onCreate or since  while also allowing Android to re-layout your Activity using the xml file for the orientation now in use   See here or here   It should be noted that these methods are now deprecated  although still more flexible than handling orientation change yourself as most of the above solutions suggest  with the recommendation that everyone switch to Fragments and instead use setRetainInstance true  on each Fragment you want to retain

User · Answer

I just discovered this lore   For keeping the Activity alive through an orientation change  and handling it through onConfigurationChanged  the documentation and the code sample above suggest this in the Manifest file    lt activity android name   MyActivity        android configChanges  orientation keyboardHidden        android label   string app name  gt    which has the extra benefit that it always works   The bonus lore is that omitting the keyboardHidden may seem logical  but it causes failures in the emulator  for Android 2 1 at least   specifying only orientation will make the emulator call both OnCreate and onConfigurationChanged sometimes  and only OnCreate other times   I haven t seen the failure on a device  but I have heard about the emulator failing for others   So it s worth documenting

User · Answer

Update for Android 3 2 and higher      Caution  Beginning with Android 3 2  API level 13   the  screen size  also changes when the device switches between portrait and landscape orientation  Thus  if you want to prevent runtime restarts due to orientation change when developing for API level 13 or higher  as declared by the minSdkVersion and targetSdkVersion attributes   you must include the  screenSize  value in addition to the  orientation  value  That is  you must declare android configChanges  orientation screenSize   However  if your application targets API level 12 or lower  then your activity always handles this configuration change itself  this configuration change does not restart your activity  even when running on an Android 3 2 or higher device

User · Answer

Using the Application Class  Depending on what you re doing in your initialization you could consider creating a new class that extends Application and moving your initialization code into an overridden onCreate method within that class   public class MyApplicationClass extends Application      Override   public void onCreate         super onCreate           TODO Put your application initialization code here          The onCreate in the application class is only called when the entire application is created  so the Activity restarts on orientation or keyboard visibility changes won t trigger it   It s good practice to expose the instance of this class as a singleton and exposing the application variables you re initializing using getters and setters   NOTE  You ll need to specify the name of your new Application class in the manifest for it to be registered and used    lt application     android name  com you yourapp MyApplicationClass    Reacting to Configuration Changes  UPDATE  this is deprecated since API 13  see the recommended alternative   As a further alternative  you can have your application listen for events that would cause a restart     like orientation and keyboard visibility changes     and handle them within your Activity   Start by adding the android configChanges node to your Activity s manifest node    lt activity android name   MyActivity        android configChanges  orientation keyboardHidden        android label   string app name  gt    or for Android 3 2  API level 13  and newer    lt activity android name   MyActivity        android configChanges  keyboardHidden orientation screenSize        android label   string app name  gt    Then within the Activity override the onConfigurationChanged method and call setContentView to force the GUI layout to be re-done in the new orientation    Override public void onConfigurationChanged Configuration newConfig      super onConfigurationChanged newConfig     setContentView R layout myLayout

User · Answer

I just discovered this lore   For keeping the Activity alive through an orientation change  and handling it through onConfigurationChanged  the documentation and the code sample above suggest this in the Manifest file    lt activity android name   MyActivity        android configChanges  orientation keyboardHidden        android label   string app name  gt    which has the extra benefit that it always works   The bonus lore is that omitting the keyboardHidden may seem logical  but it causes failures in the emulator  for Android 2 1 at least   specifying only orientation will make the emulator call both OnCreate and onConfigurationChanged sometimes  and only OnCreate other times   I haven t seen the failure on a device  but I have heard about the emulator failing for others   So it s worth documenting

User · Answer

Even though it is not  the Android way  I have gotten very good results by handling orientation changes myself and simply repositioning the widgets within a view to take the altered orientation into account   This is faster than any other approach  because your views do not have to be saved and restored   It also provides a more seamless experience to the user  because the respositioned widgets are exactly the same widgets  just moved and or resized   Not only model state  but also view state  can be preserved in this manner   RelativeLayout can sometimes be a good choice for a view that has to reorient itself from time to time   You just provide a set of portrait layout params and a set of landscaped layout params  with different relative positioning rules on each  for each child widget   Then  in your onConfigurationChanged   method  you pass the appropriate one to a setLayoutParams   call on each child   If any child control itself needs to be internally reoriented  you just call a method on that child to perform the reorientation   That child similarly calls methods on any of its child controls that need internal reorientation  and so on

User · Answer

Add this line in manifest   android configChanges  orientation screenSize

User · Answer

You might also consider using the Android platform s way of persisting data across orientation changes   onRetainNonConfigurationInstance   and getLastNonConfigurationInstance     This allows you to persist data across configuration changes  such as information you may have gotten from a server fetch or something else that s been computed in onCreate or since  while also allowing Android to re-layout your Activity using the xml file for the orientation now in use   See here or here   It should be noted that these methods are now deprecated  although still more flexible than handling orientation change yourself as most of the above solutions suggest  with the recommendation that everyone switch to Fragments and instead use setRetainInstance true  on each Fragment you want to retain

[android] Activity restart on rotation Android

Examples related to android

Examples related to rotation

Examples related to android-activity