How to restart Activity in Android

Question

How do I restart an Android Activity   I tried the following  but the Activity simply quits   public static void restartActivity Activity act            Intent intent new Intent            intent setClass act  act getClass             act startActivity intent           act finish

User · Answer

Well this is not listed but a combo of some that is already posted   if  Build VERSION SDK INT  gt   11        recreate         else       Intent intent   getIntent        finish        startActivity intent

User · Answer

I used this code so I still could support older Android versions and use recreate   on newer Android versions   Code   public static void restartActivity Activity activity       if  Build VERSION SDK INT  gt   11            activity recreate          else           activity finish            activity startActivity activity getIntent               Sample   import android app Activity  import android os Build  import android os Bundle  import android support v7 app AppCompatActivity  import android view View  import android widget Button   public class MainActivity extends AppCompatActivity       private Activity mActivity        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            mActivity   MainActivity this           Button button    Button  findViewById R id restart button           button setOnClickListener new View OnClickListener                  Override             public void onClick View v                    restartActivity mActivity                                        public static void restartActivity Activity activity            if  Build VERSION SDK INT  gt   11                activity recreate              else               activity finish                activity startActivity activity getIntent

User · Answer

I wonder why no one mentioned Intent makeRestartActivityTask   which cleanly makes this exact purpose      Make an Intent that can be used to re-launch an application s task          in its base state    startActivity Intent makeRestartActivityTask getActivity   getIntent   getComponent        This method sets Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK as default flags

User · Answer

Call the method onCreate  For example onCreate null

User · Answer

The solution for your question is   public static void restartActivity Activity act       Intent intent new Intent        intent setClass act  act getClass           Activity act  startActivity intent         Activity act  finish        You need to cast to activity context to start new activity and as well as to finish the current activity   Hope this helpful  and works for me

User · Answer

I did my theme switcher like this   Intent intent   getIntent    finish    startActivity intent     Basically  I m calling finish   first  and I m using the exact same intent this activity was started with  That seems to do the trick   UPDATE  As pointed out by Ralf below  Activity recreate   is the way to go in API 11 and beyond  This is preferable if you re in an API11  environment  You can still check the current version and call the code snippet above if you re in API 10 or below   Please don t forget to upvote Ralf s answer

User · Answer

Since API level 11  Honeycomb   you can call the recreate   method of the activity  thanks to this answer    The recreate   method acts just like a configuration change  so your onSaveInstanceState   and onRestoreInstanceState   methods are also called  if applicable

User · Answer

Before SDK 11  a way to do this is like so   public void reload         Intent intent   getIntent        overridePendingTransition 0  0       intent addFlags Intent FLAG ACTIVITY NO ANIMATION       finish        overridePendingTransition 0  0       startActivity intent

User · Answer

Call this method  private void restartFirstActivity       Intent i   getApplicationContext   getPackageManager     getLaunchIntentForPackage getApplicationContext   getPackageName        i addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY NEW TASK     startActivity i        Thanks

User · Answer

There is one hacky way that should work on any activity  including the main one   setRequestedOrientation ActivityInfo SCREEN ORIENTATION NOSENSOR   setRequestedOrientation ActivityInfo SCREEN ORIENTATION SENSOR     When orientation changes  Android generally will recreate your activity  unless you override it   This method is useful for 180 degree rotations  when Android doesn t recreate your activity

User · Answer

Even though this has been answered multiple times   If restarting an activity from a fragment  I would do it like so   new Handler   post new Runnable                Override          public void run                          Intent intent   getActivity   getIntent                intent addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY NO ANIMATION               getActivity   overridePendingTransition 0  0               getActivity   finish                 getActivity   overridePendingTransition 0  0               startActivity intent                       So you might be thinking this is a little overkill  But the Handler posting allows you to call this in a lifecycle method  I ve used this in onRestart onResume methods when checking if the state has changed between the user coming back to the app   installed something     Without the Handler if you call it in an odd place it will just kill the activity and not restart it   Feel free to ask any questions   Cheers  Chris

User · Answer

Actually the following code is valid for API levels 5 and up  so if your target API is lower than this  you ll end up with something very similar to EboMike s code   intent addFlags Intent FLAG ACTIVITY NO ANIMATION   overridePendingTransition 0  0

User · Answer

If you are calling from some fragment so do below code   Intent intent   getActivity   getIntent    getActivity   finish    startActivity intent

User · Answer

Just to combine Ralf and Ben s answers  including changes made in comments    if  Build VERSION SDK INT  gt   11        recreate      else       Intent intent   getIntent        intent addFlags Intent FLAG ACTIVITY NO ANIMATION       finish        overridePendingTransition 0  0        startActivity intent       overridePendingTransition 0  0

User · Answer

This is by far the easiest way to restart the current activity   finish    startActivity getIntent

User · Answer

In conjunction with strange SurfaceView lifecycle behaviour with the Camera  I have found that recreate   does not behave well with the lifecycle of SurfaceViews  surfaceDestroyed isn t ever called during the recreation cycle  It is called after onResume  strange   at which point my SurfaceView is destroyed   The original way of recreating an activity works fine   Intent intent   getIntent    finish    startActivity intent     I can t figure out exactly why this is  but it is just an observation that can hopefully guide others in the future because it fixed my problems i was having with SurfaceViews

User · Answer

If anybody is looking for Kotlin answer you just need this line  Fragment startActivity Intent makeRestartActivityTask activity  intent  component    Activity startActivity Intent makeRestartActivityTask this intent  component

User · Answer

public void onRestart         super onRestart        Intent intent new Intent        intent setClass act  act getClass         finish        act startActivity intent       try to use this

User · Answer

This is the way I do it            val i   Intent context    MainActivity  class java          i addFlags Intent FLAG ACTIVITY CLEAR TASK          startActivity i

User · Answer

If you remove the last line  you ll create new act Activity  but your old instance will still be alive   Do you need to restart the Activity like when the orientation is changed  i e  your state is saved and passed to onCreate Bundle     If you don t  one possible workaround would be to use one extra  dummy Activity  which would be started from the first Activity  and which job is to start new instance of it  Or just delay the call to act finish    after the new one is started   If you need to save most of the state  you are getting in pretty deep waters  because it s non-trivial to pass all the properties of your state  especially without leaking your old Context Activity  by passing it to the new instance   Please  specify what are you trying to do

User · Answer

This solution worked for me   First finish the activity and then start it again   Sample code   public void restartActivity        Intent mIntent   getIntent        finish        startActivity mIntent

[android] How to restart Activity in Android

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