How to kill an application with all its activities

Question

Possible Duplicate    Quitting an application - is that frowned upon        I want to offer the user an option to exit the application as I need to delete some sensitive data  which is stored in the SharedPreferences as long as the application needs it   As soon as the user wants to exit  the password in the SharedPreferences should be wiped and of course all activities of the application should be closed  it makes no sense to run them without the known password - they would crash    How can I do that   System exit 0  and finish   only exit the current activity - useless  I know there is a taskmanager app  How is that one doing it  It s able to kill the whole application

User · Answer

My understanding of the Android application framework is that this is specifically not permitted. An application is closed automatically when it contains no more current activities. Trying to create a "kill" button is apparently contrary to the intended design of the application system.

To get the sort of effect you want, you could initiate your various activities with startActivityForResult(), and have the exit button send back a result which tells the parent activity to finish(). That activity could then send the same result as part of its onDestroy(), which would cascade back to the main activity and result in no running activities, which should cause the app to close.

User · Answer

When you use the finish   method  it does not close the process completely   it is STILL working in background    Please use this code in Main Activity  Please don t use in every activities or sub Activities     Override public void onBackPressed          android os Process killProcess android os Process myPid            This above line close correctly

User · Answer

When the user wishes to exit all open activities  they should press a button which loads the first Activity that runs when your app starts  in my case  LoginActivity      Intent intent   new Intent getApplicationContext    LoginActivity class   intent setFlags Intent FLAG ACTIVITY CLEAR TOP   intent putExtra  EXIT   true   startActivity intent     The above code clears all the activities except for LoginActivity   LoginActivity is the first activity that is brought up when the user runs the program   Then put this code inside the LoginActivity s onCreate  to signal when it should self destruct when the  Exit  message is passed       if  getIntent   getBooleanExtra  EXIT   false              finish            The answer you get to this question from the Android platform is   Don t make an exit button   Finish activities the user no longer wants  and the Activity manager will clean them up as it sees fit

User · Answer

You are correct  calling finish   will only exit the current activity  not the entire application  however  there is a workaround for this    Every time you start an Activity  start it using startActivityForResult       When you want to close the entire app  you can do something like this   setResult RESULT CLOSE ALL   finish      Then define every activity s onActivityResult      callback so when an activity returns with the RESULT CLOSE ALL value  it also calls finish      Override protected void onActivityResult int requestCode  int resultCode  Intent data        switch resultCode            case RESULT CLOSE ALL          setResult RESULT CLOSE ALL           finish              super onActivityResult requestCode  resultCode  data       This will cause a cascade effect closing all activities   Also  I support CommonsWare in his suggestion  store the password in a variable so that it will be destroyed when the application is closed

User · Answer

Using onBackPressed   method    Override public void onBackPressed             android os Process killProcess android os Process myPid         or use the finish   method  I have something like    Password Error  I call function     Quit                       protected void Quit             super finish            With super finish   you close the super class s activity

User · Answer

which is stored in the   SharesPreferences as long as the   application needs it    Why      As soon as the user wants to exit  the   password in the SharedPreferences   should be wiped and of course all   activities of the application should   be closed  it makes no sense to run   them without the known password - they   would crash     Even better  don t put the password in SharedPreferences  Hold onto it in a static data member  The data will naturally go away when all activities in the app are exited  e g   BACK button  or otherwise destroyed  e g   kicked out of RAM to make room for other activities sometime after the user pressed HOME    If you want some sort of proactive  flush password   just set the static data member to null  and have your activities check that member and take appropriate action when it is null

[android] How to kill an application with all its activities?

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