Programmatically relaunch recreate an activity

Question

After I do some change in my database  that involves significant change in my views  I would like to redraw  re-execute onCreate     How is that possible

User · Answer

Call the recreate    method from where you want to recreate your activity   This method will destroy current instance of Activity with onDestroy   and then recreate activity with onCreate

User · Answer

After looking for the gingerbread implement for recreate  I d like to use following codes  for gingerbread    activity mMainThread mAppThread scheduleRelaunchActivity activity mToken  null  null  0  false  null     For these codes  it s from the implementation in higher api   public void recreate         if  mParent    null            throw new IllegalStateException  Can only be called on top-level activity              if  Looper myLooper      mMainThread getLooper              throw new IllegalStateException  Must be called from main thread              mMainThread requestRelaunchActivity mToken  null  null  0  false  null  false       Api-10 has no requestRelaunchActivity  however  from the diff  i found this                public final void scheduleRelaunchActivity IBinder token                       List lt ResultInfo gt  pendingResults  List lt Intent gt  pendingNewIntents                       int configChanges  boolean notResumed  Configuration config        -            ActivityClientRecord r   new ActivityClientRecord        -     -            r token   token      -            r pendingResults   pendingResults      -            r pendingIntents   pendingNewIntents      -            r startsNotResumed   notResumed      -            r createdConfig   config      -     -            synchronized  mPackages        -                mRelaunchingActivities add r       -                  -     -            queueOrSendMessage H RELAUNCH ACTIVITY  r  configChanges                    requestRelaunchActivity token  pendingResults  pendingNewIntents                           configChanges  notResumed  config  true                    So I think I could use scheduleRelaunchActivity instead of requestRelaunchActivity   And I have written them using reflect   package me piebridge util   import java lang reflect Field  import java lang reflect InvocationTargetException  import java lang reflect Method  import java util List   import android annotation TargetApi  import android app Activity  import android content res Configuration  import android os Build  import android os IBinder   public class GingerBreadUtil        private static Field scanField Class lt   gt  clazz  String    names            for  String name   names                Field field              try                   field   clazz getDeclaredField name                   field setAccessible true                   return field                catch  NoSuchFieldException e                              try                   field   clazz getField name                   field setAccessible true                   return field                catch  NoSuchFieldException e                                    return null             public static void recreate Activity activity            if  Build VERSION SDK INT  gt  Build VERSION CODES GINGERBREAD MR1                recreateHC activity             else               try                   recreateGB activity                 catch  InvocationTargetException e                    e getTargetException   printStackTrace                  catch  Exception e                    e printStackTrace                                        TargetApi Build VERSION CODES HONEYCOMB      private static void recreateHC Activity activity              Activity  activity  recreate               private static void recreateGB Activity activity  throws IllegalArgumentException  IllegalAccessException  NoSuchMethodException  InvocationTargetException           Field Activity mToken   scanField Activity class   mToken            IBinder mToken    IBinder  Activity mToken get activity           Field Activity mMainThread   scanField Activity class   mMainThread            Object mMainThread   Activity mMainThread get activity           Field ActivityThread mAppThread   scanField mMainThread getClass     mAppThread            Object mAppThread   ActivityThread mAppThread get mMainThread           Method method   mAppThread getClass   getMethod  scheduleRelaunchActivity               IBinder class  List class  List class  int class  boolean class  Configuration class           method invoke mAppThread  mToken  null  null  0  false  null              I m using these codes for the back-porting of xposed framework

User · Answer

Option 1  Call recreate   on your Activity  However this method causes a flashing black screen to appear during the activity re-creation   Option 2  finish    startActivity getIntent       No  flashing  black screen here  but you ll see a transition between the old and the new instances with a not-so-pleasant black background  We can do better   Option 3  To fix this  we can add a call to overridePendingTransition      finish    startActivity getIntent     overridePendingTransition 0  0     Good bye black screen  but in my case I still see some kind of transition  a fade animation   on a colored background this time  That s because you re finishing the current instance of your activity before the new one is created and becomes fully visible  and the in-between color is the value of the windowBackground theme attribute   Option 4  startActivity getIntent     finish      Calling finish   after startActivity   will use the default transition between activities  often with a little slide-in animation  But the transition is still visible   Option 5  startActivity getIntent     finish    overridePendingTransition 0  0     To me  this is the best solution because it restarts the activity without any visible transition  like if nothing happened   It could be useful if  for example  in your app you expose a way to change the display language independently of the system s language  In this case  whenever the user changes your app s language you ll probably want to restart your activity without transition  making the language switch look instantaneous

User · Answer

If this is your problem  you should probably implement another way to do the view filling in your Activity  Instead of re running onCreate   you should make it so onCreate   calls your filling method with some argument  When the data changes  the filling method should get called with another argument

User · Answer

Also depending on your situation  you may need getActivity   recreate    instead of just recreate     For example  you should use it if you are doing recreate   in the class which has been created inside class of activity

User · Answer

The way I resolved it is by using Fragments  These are backwards compatible until API 4 by using the support library   You make a  wrapper  layout with a FrameLayout in it   Example    lt LinearLayout xmlns android  http   schemas android com apk res android       android layout width  match parent       android layout height  match parent       android orientation  vertical   gt         lt FrameLayout xmlns android  http   schemas android com apk res android            android id    id fragment container            android layout width  match parent            android layout height  match parent    gt   lt  LinearLayout gt    Then you make a FragmentActivity in wich you can replace the FrameLayout any time you want   Example   public class SampleFragmentActivity extends FragmentActivity          Override  public void onCreate Bundle savedInstanceState         super onCreate savedInstanceState       setContentView R layout wrapper           Check that the activity is using the layout version with        the fragment container FrameLayout     if  findViewById R id fragment container     null                    However  if we re being restored from a previous state             then we don t need to do anything and should return or else            we could end up with overlapping fragments          if  savedInstanceState    null                        return                    updateLayout                  private void updateLayout            Fragment fragment   new SampleFragment         fragment setArguments getIntent   getExtras              replace original fragment by new fragment      getSupportFragmentManager   beginTransaction   replace R id fragment container  fragment  commit          In the Fragment you inflate replace you can use the onStart and onCreateView like you normaly would use the onCreate of an activity   Example   public class SampleFragment extends Fragment         Override     public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState                return inflater inflate R layout yourActualLayout  container  false               Override     public void onStart                    do something with the components  or not          TextView text    TextView  getActivity   findViewById R id text1            super onStart

User · Answer

If you re just looking to re-do your view  I had the exact same issue  In the onResume function try putting this   mView   new AndroidPinballView getApplication       This was also in my onCreate    so putting this in the onResume worked for me

User · Answer

for API before 11 you cannot use recreate    I solved in this way   Bundle temp bundle   new Bundle    onSaveInstanceState temp bundle   Intent intent   new Intent this  MainActivity class   intent putExtra  bundle   temp bundle   startActivity intent   finish      and in onCreate     Override public void onCreate Bundle savedInstanceState         if  getIntent   hasExtra  bundle    amp  amp  savedInstanceState  null           savedInstanceState   getIntent   getExtras   getBundle  bundle               super onCreate savedInstanceState       setContentView R layout activity main         code

User · Answer

When I need to restart an activity  I use following code  Though it is not recommended    Intent intent   getIntent    finish    startActivity intent

User · Answer

I once made a test app that uploads  deletes  and then redownloads the database file using firebase cloud storage  To display the data in database  the following code was the only solution I found  Neither recreate   nor finish   worked in this case   Intent intent   new Intent getApplicationContext    MainActivity class   startActivity intent   System exit 0

User · Answer

Call the recreate method of the activity

User · Answer

i found out the best way to refresh your Fragment when data change  if you have a button  search   you have to initialize your ARRAY list inside the button  mSearchBtn setOnClickListener new View OnClickListener       Override   public void onClick View v     mList   new ArrayList lt Node gt      firebaseSearchQuery addValueEventListener new ValueEventListener        Override   public void onDataChange DataSnapshot dataSnapshot            for  DataSnapshot dataSnapshot1   dataSnapshot getChildren               Node p   dataSnapshot1 getValue Node  class           mList add p                 YourAdapter   new NodeAdapter getActivity    mList         mRecyclerView setAdapter YourAdapter

User · Answer

Combining some answers here you can use something like the following   class BaseActivity extends SherlockFragmentActivity          Backwards compatible recreate         Override     public void recreate                 if  android os Build VERSION SDK INT  gt   11                        super recreate                      else                       startActivity getIntent                 finish                        Testing  I tested it a bit  and there are some problems    If the activity is the lowest one on the stack  calling startActivity       finish    just exist the app and doesn t restart the activity  super recreate   doesn t actually act the same way as totally recreating the activity  It is equivalent to rotating the device so if you have any Fragments with setRetainInstance true  they won t be recreated  merely paused and resumed    So currently I don t believe there is an acceptable solution

User · Answer

UPDATE  Android SDK 11 added a recreate   method to activities     I ve done that by simply reusing the intent that started the activity  Define an intent starterIntent in your class and assign it in onCreate   using starterIntent   getIntent     Then when you want to restart the activity  call finish    startActivity starterIntent    It isn t a very elegant solution  but it s a simple way to restart your activity and force it to reload everything

User · Answer

If you want to pass a parameter to onCreate   then you have to create a new intent with adding extra and call StartActivity with it  Here is a simple example which i did using this way                 String eczSabit   sa getItem position  getValue                  if  Util IsNullOrEmpty eczSabit                      sabit   Long parseLong eczSabit                     Intent intent   new Intent eczaneSegmentasyon this eczaneSegmentasyon class                     intent putExtra  sabit   sabit                     startActivity intent

[android] Programmatically relaunch/recreate an activity?

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