Android Quit application when press back button

Question

In my application i want exit from app when press back button  this my code    Override     public void onBackPressed             new AlertDialog Builder this  setIcon android R drawable ic dialog alert  setTitle  Exit                    setMessage  Are you sure you want to exit                     setPositiveButton  Yes   new DialogInterface OnClickListener                          Override                     public void onClick DialogInterface dialog  int which                            finish                                             setNegativeButton  No   null  show            it s work correctly but when i exit from app it does not exit completely and show empty page with my app logo and when i again press back button exit from app  How can i fix it     EDIT    I use this code instead of above but my app exit completely but i want it running at background and does not exit completely   how can i do it    Override     public void onBackPressed             new AlertDialog Builder this  setIcon android R drawable ic dialog alert  setTitle  Exit                    setMessage  Are you sure                     setPositiveButton  yes   new DialogInterface OnClickListener                          Override                     public void onClick DialogInterface dialog  int which                             Intent intent   new Intent Intent ACTION MAIN                           intent addCategory Intent CATEGORY HOME                           intent setFlags Intent FLAG ACTIVITY NEW TASK                           startActivity intent                           finish                                             setNegativeButton  no   null  show

User · Answer

Instead of finish   call super onBackPressed

User · Answer

When you press back and then you finish your current activity say A   you see a blank activity with your app logo say B   this simply means that activity B which is shown after finishing A is still in backstack  and also activity A was started from activity B  so in activity  You should start activity A with flags as   Intent launchNextActivity  launchNextActivity   new Intent B class  A class   launchNextActivity addFlags Intent FLAG ACTIVITY NEW TASK   launchNextActivity addFlags Intent FLAG ACTIVITY CLEAR TASK                     launchNextActivity addFlags Intent FLAG ACTIVITY NO ANIMATION   startActivity launchNextActivity     Now your activity A is top on stack with no other activities of your application on the backstack   Now in the activity A where you want to implement onBackPressed to close the app  you may do something like this    private Boolean exit   false   Override     public void onBackPressed             if  exit                finish       finish activity           else               Toast makeText this   Press Back again to Exit                        Toast LENGTH SHORT  show                exit   true              new Handler   postDelayed new Runnable                      Override                 public void run                         exit   false                                   3   1000                       The Handler here handles accidental back presses  it simply shows a Toast  and if there is another back press within 3 seconds  it closes the application

User · Answer

In order to exit from the app on pressing back button you have to first clear all the top activities and then start the ACTION MAIN of android phone  So  you have to write all these code only which is mentioned below    Note   In your case MainActivity get replaced by YourActivity   Override public void onBackPressed              new AlertDialog Builder this                   setTitle  Really Exit                     setMessage  Are you sure you want to exit                     setNegativeButton android R string no  null                   setPositiveButton android R string yes  new DialogInterface OnClickListener                          Override                     public void onClick DialogInterface dialog  int which                            MainActivity super onBackPressed                            quit                                             create   show            public void quit             Intent start   new Intent Intent ACTION MAIN           start addCategory Intent CATEGORY HOME           start setFlags Intent FLAG ACTIVITY NEW TASK           start addFlags Intent FLAG ACTIVITY CLEAR TOP           startActivity start

User · Answer

In my understanding Google wants Android to handle memory management and shutting down the apps  If you must exit the app from code  it might be beneficial to ask Android to run garbage collector    Override public void onBackPressed        System gc        System exit 0       You can also add finish   to the code  but it is probably redundant  if you also do System exit 0

User · Answer

Try this   Intent intent   new Intent Intent ACTION MAIN             intent addCategory Intent CATEGORY HOME             intent setFlags Intent FLAG ACTIVITY CLEAR TOP       Change Here              startActivity intent             finish              System exit 0

User · Answer

It means your previous activity in stack when you start this activity  Add finish    after the line in which you calling this activity   In your all previous activity  when you start new activity like-  startActivity I     Add finish    after this

User · Answer

nobody seems to have recommended noHistory  true  in manifest xml to prevent certain activity to appear after you press back button which by default calling method finish

User · Answer

Use this code very simple solution    Override     public void onBackPressed           super onBackPressed       this line close the  app on backpress

User · Answer

try this   Intent a   new Intent Intent ACTION MAIN   a addCategory Intent CATEGORY HOME   a setFlags Intent FLAG ACTIVITY NEW TASK   startActivity a

User · Answer

This one work for me I found it myself by combining other answers   private Boolean exit   false   override public void onBackPressed         if  exit            finish       finish activity            else           Toast makeText this   Press Back again to Exit                Toast LENGTH SHORT  show             exit   true           new Handler   postDelayed new Runnable                Override          public void run                     TODO Auto-generated method stub              Intent a   new Intent Intent ACTION MAIN                a addCategory Intent CATEGORY HOME                a setFlags Intent FLAG ACTIVITY NEW TASK                startActivity a                    1000

User · Answer

Finish doesn t close the app  it just closes the activity  If this is the launcher activity  then it will close your app  if not  it will go back to the previous activity   What you can do is use onActivityResult to trigger as many finish   as needed to close all the open activities

User · Answer

I had the Same problem  I have one LoginActivity and one MainActivity  If I click back button in MainActivity  Application has to close  SO I did with OnBackPressed method  this moveTaskToBack   work as same as Home Button  It leaves the Back stack as it is   public void onBackPressed           super onBackPressed        moveTaskToBack true

[android] Android: Quit application when press back button

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