How to quit android application programmatically

Question

I Found some codes for quit an Android application programatically  By calling any one of the following code in onDestroy   will it quit application entirely        System runFinalizersOnExit true               OR  android os Process killProcess android os Process myPid       I dont want to run my application in background after clicking quit button   Pls suggest me can i use any one of these code to quit my app  If so which code can i use  Is it good way to quit the app in Android

User · Answer

Just use finish   on back key press onKeypressed

User · Answer

First of all  this approach requires min Api 16   I will divide this solution to 3 parts to solve this problem more widely   1  If you want to quit application in an Activity use this code snippet   if Build VERSION SDK INT gt  16  amp  amp  Build VERSION SDK INT lt 21       finishAffinity      else if Build VERSION SDK INT gt  21       finishAndRemoveTask        2  If you want to quit the application in a non Activity class which has access to Activity then use this code snippet   if Build VERSION SDK INT gt  16  amp  amp  Build VERSION SDK INT lt 21       getActivity   finishAffinity      else if Build VERSION SDK INT gt  21       getActivity   finishAndRemoveTask        3  If you want to quit the application in a non Activity class and cannot access to Activity such as Service I recommend you to use BroadcastReceiver  You can add this approach to all of your Activities in your project   Create LocalBroadcastManager and BroadcastReceiver instance variables  You can replace getPackageName     closeapp  if you want to   LocalBroadcastManager mLocalBroadcastManager  BroadcastReceiver mBroadcastReceiver   new BroadcastReceiver          Override     public void onReceive Context context  Intent intent            if intent getAction   equals getPackageName     closeapp                 if Build VERSION SDK INT gt  16  amp  amp  Build VERSION SDK INT lt 21                   finishAffinity                  else if Build VERSION SDK INT gt  21                   finishAndRemoveTask                                       Add these to onCreate   method of Activity   mLocalBroadcastManager   LocalBroadcastManager getInstance this   IntentFilter mIntentFilter   new IntentFilter    mIntentFilter addAction getPackageName     closeapp    mLocalBroadcastManager registerReceiver mBroadcastReceiver  mIntentFilter     Also  don t forget to call unregister receiver at onDestroy   method of Activity  mLocalBroadcastManager unregisterReceiver mBroadcastReceiver     For quit application  you must send broadcast using LocalBroadcastManager which I use in my PlayService class which extends Service   LocalBroadcastManager localBroadcastManager   LocalBroadcastManager getInstance PlayService this   localBroadcastManager sendBroadcast new Intent getPackageName       closeapp

User · Answer

It s not a good decision  cause it s against the Android s application processing principles  Android doesn t kill any process unless it s absolutely inevitable  This helps apps start faster  cause they re always kept in memory  So you need a very special reason to kill your application s process

User · Answer

If you re using Kotlin  the proper way to exit the app and alternative to System exit   is a built-in method  exitProcess 0    See the documentation   Number 0 as a parameter means the exit is intended and no error occurred

User · Answer

If you want to close your app  For API  gt   21  use  finishAndRemoveTask     For API  lt  21 use  finishAffinity

User · Answer

This will kill anything     int p   android os Process myPid    android os Process killProcess p

User · Answer

It depends on how fast you want to close your app   A safe way to close your app is finishAffinity     It closes you app after all processes finished processing  This may need some time  If you close your app this way  and restart it after a short time  it is possible that your new application runs in the same process  With all the not finished processes and singleton objects of the old application   If you want to be sure  that your app is closed completly use System exit 0    This will close your app immediatly  But it is possible  that you damage files that your app has open or an edit on shared preferences does not finish  So use this carefully   If you use watchdog in combination with a long running task  you can see the influences of the different methods   new ANRWatchDog 2000  setANRListener new ANRWatchDog ANRListener         public void onAppNotResponding ANRError error            MainActivity this finishAffinity            System exit 0            start    for int i   0  i  lt  10    i       --i      This kills your app after 2 seconds without displaying an ANR dialog or something like that  If you remove System exit 0   run this code and restart the app after it is closed  you will experience some strange behaviour  because the endless loop is still running

User · Answer

Please think really hard about if you do need to kill the application  why not let the OS figure out where and when to free the resources   Otherwise  if you re absolutely really sure  use  finish      As a reaction to  dave appleton s comment  First thing read the big question answer combo  gabriel posted  Is quitting an application frowned upon   Now assuming we have that  the question here still has an answer  being that the code you need if you are doing anything with quitting is finish    Obviously you can have more than one activity etc etc  but that s not the point  Lets run by some of the use-cases   You want to let the user quit everything because of memory usage and  not running in the background  Doubtfull  Let the user stop certain activities in the background  but let the OS kill any unneeded recourses  You want a user to not go to the previous activity of your app  Well  either configure it so it doesn t  or you need an extra option  If most of the time the back previous-activity works  wouldn t the user just press home if he she wants to do something else  If you need some sort of reset  you can find out if how etc your application was quit  and if your activity gets focus again you can take action on that  showing a fresh screen instead of restarting where you were    So in the end  ofcourse  finish   doesn t kill everthing  but it is still the tool you need I think  If there is a usecase for  kill all activities   I haven t found it yet

User · Answer

I think what you are looking for is this  activity moveTaskToBack Boolean nonRoot

User · Answer

You can use finishAndRemoveTask    from API 21     public void finishAndRemoveTask         Finishes all activities in this task and removes it from the recent tasks list

User · Answer

public void quit             int pid   android os Process myPid            android os Process killProcess pid           System exit 0

User · Answer

Since API 16 you can use the finishAffinity method  which seems to be pretty close to closing all related activities by its name and Javadoc description  this finishAffinity      Finish this activity as well as all activities immediately below it in the current task that have the same affinity  This is typically used when an application can be launched on to another task  such as from an ACTION VIEW of a content type it understands  and the user has used the up navigation to switch out of the current task and into its own task  In this case  if the user has navigated down into any other activities of the second application  all of those should be removed from the original task as part of the task switch  Note that this finish does not allow you to deliver results to the previous activity  and an exception will be thrown if you are trying to do so    Since API 21 you can use a very similar command finishAndRemoveTask      Finishes all activities in this task and removes it from the recent tasks list

User · Answer

The easiest way I found to quit an application from an activity  without breaking Android s logic and without adding more code in existing activities and passing extras is the following    public static void quitApplication  Activity currentActivity        Intent intent   new Intent  currentActivity  QuitApplicationActivity class       intent setFlags Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY CLEAR TASK   Intent FLAG ACTIVITY CLEAR TOP        currentActivity startActivity  intent       currentActivity finish         the QuitApplicationActivity being    public class QuitApplicationActivity extends AppCompatActivity         Override     protected void onCreate  Bundle savedInstanceState            super onCreate  savedInstanceState            finish

User · Answer

Is quitting an application frowned upon   Go through this link  It answers your question  The system does the job of killing an application    Suppose you have two activities A an B  You navigate from A to B  When you click back button your activity B is popped form the backstack and destroyed  Previous activity in back stack activity A takes focus   You should leave it to the system to decide when to kill the application   public void finish    Call this when your activity is done and should be closed    Suppose you have many activities  you can use Action bar  On click of home icon naviagate to MainActivity of your application  In MainActivity click back button to quit from the application

User · Answer

The correct and exact solution to quit the app on button click is using the below code     On Button Back pressed event  public void onBackPressed         moveTaskToBack true      finish

User · Answer

You had better use finish   if you are in Activity  or getActivity   finish   if you are in the Fragment     If you want to quit the app completely  then use   getActivity   finish    System exit 0

User · Answer

finishAffinity     System exit 0    If you will use only finishAffinity    without System exit 0   your application will quit but the allocated memory will still be in use by your phone  so    if you want a clean and really quit of an app  use both of them   This is the simplest method and works anywhere  quit the app for real  you can have a lot of activity opened will still quitting all with no problem   example on a button click  public void exitAppCLICK  View view         finishAffinity        System exit 0        or if you want something nice  example with an alert dialog with 3 buttons YES NO and CANCEL     alertdialog for exit the app AlertDialog Builder alertDialogBuilder   new AlertDialog Builder this       set the title of the Alert Dialog alertDialogBuilder setTitle  your title        set dialog message alertDialogBuilder          setMessage  your message            setCancelable false           setPositiveButton  YES                    new DialogInterface OnClickListener                         public void onClick DialogInterface dialog                                          int id                               what to do if YES is tapped                         finishAffinity                            System exit 0                                                      setNeutralButton  CANCEL                    new DialogInterface OnClickListener                         public void onClick DialogInterface dialog                                          int id                               code to do on CANCEL tapped                         dialog cancel                                                       setNegativeButton  NO                    new DialogInterface OnClickListener                         public void onClick DialogInterface dialog                                          int id                               code to do on NO tapped                         dialog cancel                                               AlertDialog alertDialog   alertDialogBuilder create     alertDialog show

User · Answer

This may be very late and also as per the guidelines you re not supposed to handle the life cycle process by yourself as the os does that for you   A suggestion would be that you register a broadcast receiver in all your activities with  finish    in their onReceive     amp  whenever you wish to quit you can simple pass an intent indicating that all activities must shut down      Although make sure that you do  unregister  the receiver in your onDestroy   methods

User · Answer

getActivity   finish    System exit 0     this is the best way to exit your app      The best solution for me

User · Answer

Friends just add this function to exit your application programmatically  java public void onBackPressed           finishAffinity        System exit 0

User · Answer

There is no application quitting in android  SampleActivity this finish    will finish the current activity   When you switch from one activity to another keep finish the previous one  Intent homeintent   new Intent SampleActivity this SecondActivity class   startActivity homeintent   SampleActivity this finish

User · Answer

I think that application should be kill in some case  For example  there is an app can be used only after login  The login activity has two buttons   login  and  cancel   When you click  cancel  button  it definitely means  Terminate the app   Nobody wants the app alive in the background  So I agree that some cases need to shut down the app

User · Answer

We want code that is robust and simple  This solution works on old devices and newer devices       if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN            getActivity   finishAffinity          else          getActivity   finish            System exit  0

User · Answer

To exit you application you can use the following   getActivity   finish    Process killProcess Process myPid     System exit 1     Also to stop the services too call the following method   private void stopServices                 final ActivityManager activityManager   SystemServices getActivityManager context       final List lt ActivityManager RunningServiceInfo gt  runningServices   activityManager getRunningServices Integer MAX VALUE       final int pid   Process myPid        for  ActivityManager RunningServiceInfo serviceInfo   runningServices            if  serviceInfo pid    pid  amp  amp   SenderService class getName   equals serviceInfo service getClassName                   try                   final Intent intent   new Intent                    intent setComponent serviceInfo service                   context stopService intent                 catch  SecurityException e                         handle exception

User · Answer

Create a ExitActivity and declare it in manifest  And call ExitActivity exit context  for exiting app   public class ExitActivity extends AppCompatActivity         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           finish               public static void exit Context context            Intent intent   new Intent context  ExitActivity class           intent addFlags Intent FLAG ACTIVITY CLEAR TOP           intent addFlags Intent FLAG ACTIVITY NEW TASK           intent addFlags Intent FLAG ACTIVITY CLEAR TASK           context startActivity intent

User · Answer

Just to add one to the list of brutal methods of terminating an App   Process sendSignal Process myPid    Process SIGNAL KILL

User · Answer

Write this code in your on backpressed override method   Override public void onBackPressed         Intent intent   new Intent Intent ACTION MAIN       intent addCategory Intent CATEGORY HOME       intent setFlags Intent FLAG ACTIVITY NEW TASK       startActivity intent

User · Answer

Try this   int pid   android os Process myPid    android os Process killProcess pid

User · Answer

I m not sure if this is frowned upon or not  but this is how I do it     Step 1 - I usually have a class that contains methods and variables that I want to access globally   In this example I ll call it the  App  class   Create a static Activity variable inside the class for each activity that your app has   Then create a static method called  close  that will run the finish   method on each of those Activity variables if they are NOT null   If you have a main parent activity  close it last   public class App                                                                               INSTANTIATED ACTIVITY VARIABLES                                                                               public static Activity activity1          public static Activity activity2          public static Activity activity3                                                                               CLOSE APP METHOD                                                                               public static void close                         if  App activity3    null   App activity3 finish                 if  App activity2    null   App activity2 finish                 if  App activity1    null   App activity1 finish                   Step 2 - in each of your activities  override the onStart   and onDestroy   methods   In onStart    set the static variable in your App class equal to  this    In onDestroy    set it equal to null  For example  in the  Activity1  class    Override public void onStart            RUN SUPER   REGISTER ACTIVITY AS INSTANTIATED IN APP CLASS          super onStart            App activity1   this      Override public void onDestroy            RUN SUPER   REGISTER ACTIVITY AS NULL IN APP CLASS          super onDestroy            App activity1   null      Step 3 -  When you want to close your app  simply call App close   from anywhere   All instantiated activities will close   Since you are only closing activities and not killing the app itself  as in your examples   Android is free to take over from there and do any necessary cleanup   Again  I don t know if this would be frowned upon for any reason   If so  I d love to read comments on why it is and how it can be improved

User · Answer

you can your full apps quit  thus   Intent intent   getBaseContext   getPackageManager                 getLaunchIntentForPackage getBaseContext   getPackageName     intent  addFlags Intent FLAG ACTIVITY CLEAR TOP   startActivity intent     it will work 100   Best of luck

User · Answer

Sivi  s answer closes the app  But on return  if you have some child activities  another unfinished activity might be opened  I added noHistory true to my activities so the app on return starts from MainActivity    lt activity        android name   MainActivity        android noHistory  true  gt   lt  activity gt

User · Answer

Similar to  MobileMateo  but in Kotlin  if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN        this finishAffinity     else      this finish       System exit 0

User · Answer

Easy and simple way to quit from the application  Intent homeIntent   new Intent Intent ACTION MAIN   homeIntent addCategory Intent CATEGORY HOME   homeIntent setFlags Intent FLAG ACTIVITY CLEAR TOP   startActivity homeIntent

[android] How to quit android application programmatically

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