How to close Android application

Question

I want to close my application  so that it no longer runs in the background   How to do that  Is this good practice on Android platform   If I rely on the  back  button  it closes the app  but it stays in background  There is even application called  TaskKiller  just to kill those apps in the background

User · Accepted Answer

Just to answer my own question now after so much time (since CommonsWare commented on the most popular answer telling we should NOT do this):

When I want to quit the app:

I start my first activity (either splash screen, or whatever activity is currently at the bottom of the activity stack) with FLAG_ACTIVITY_CLEAR_TOP (which will quit all the other activities started after it, which means - all of them). Just make to have this activity in the activity stack (not finish it for some reason in advance).
I call finish() on this activity

This is it, works quite well for me.

User · Answer

by calling finish    in OnClick button or on menu  case R id menu settings        finish         return true

User · Answer

Put a finish    statement as below   myIntent putExtra  key1   editText2 getText   toString      finish     LoginActivity this startActivity myIntent     In every activity

User · Answer

For exiting app ways   Way 1    call finish    and override onDestroy     Put the following code in onDestroy     System runFinalizersOnExit true    or  android os Process killProcess android os Process myPid       Way 2    public void quit         int pid   android os Process myPid        android os Process killProcess pid       System exit 0       Way 3    Quit     protected void Quit         super finish        Way 4    Intent intent   new Intent getApplicationContext    LoginActivity class   intent setFlags Intent FLAG ACTIVITY CLEAR TOP   intent putExtra  EXIT   true   startActivity intent    if  getIntent   getBooleanExtra  EXIT   false          finish        Way  5    Sometimes 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 the following   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

User · Answer

public class CloseAppActivity extends AppCompatActivity       public static final void closeApp Activity activity                Intent intent   new Intent activity  CloseAppActivity class           intent addCategory Intent CATEGORY HOME           intent addFlags Intent FLAG ACTIVITY NEW TASK                   IntentCompat FLAG ACTIVITY CLEAR TASK           activity startActivity intent               Override     protected void onCreate Bundle savedInstanceState                super onCreate savedInstanceState           finish              and in manifest    lt activity      android name   presenter activity CloseAppActivity       android noHistory  true       android clearTaskOnLaunch  true   gt    Then you can call CloseAppActivity closeApp fromActivity  and application will be closed

User · Answer

none of all above answers working good on my app  here is my working code  on your exit button   Intent intent   new Intent getApplicationContext    MainActivity class   ComponentName cn   intent getComponent    Intent mainIntent   IntentCompat makeRestartActivityTask cn   mainIntent addFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY NEW TASK   mainIntent addFlags Intent FLAG ACTIVITY NO HISTORY   mainIntent putExtra  close   true   startActivity mainIntent   finish      that code is to close any other activity and bring MainActivity on top now on your MainActivity   if  getIntent   getBooleanExtra  close   false        finish

User · Answer

I think it will close your activity and all Sub activity related to it   public boolean onOptionsItemSelected MenuItem item             int id   item getItemId             if  id    R id Exit                this finishAffinity                return true                     return super onOptionsItemSelected item

User · Answer

Copy below code and paste AndroidManifest xml file in under First Activity Tag    lt activity                                     android name  com SplashActivity              android clearTaskOnLaunch  true               android launchMode  singleTask              android excludeFromRecents  true  gt                             lt intent-filter gt                   lt action android name  android intent action MAIN    gt                   lt category android name  android intent category LAUNCHER                    gt               lt  intent-filter gt           lt  activity gt         Also Add this below code in all under Activity Tag in AndroidManifest xml file   android finishOnTaskLaunch  true

User · Answer

Just write this code on your button EXIT click   Intent intent   new Intent getApplicationContext    MainActivity class   intent setFlags Intent FLAG ACTIVITY CLEAR TOP   intent putExtra  LOGOUT   true   startActivity intent     And in the onCreate   method of your MainActivity class write below code as a first line   if  getIntent   getBooleanExtra  LOGOUT   false         finish

User · Answer

YES   You can most certainly close your application so it is no longer running in the background  Like others have commented finish   is the Google recommended way that doesn t really mean your program is closed   System exit 0     That right there will close your application out leaving nothing running in the background However use this wisely and don t leave files open  database handles open  etc These things would normally be cleaned up through the finish   command   I personally HATE when I choose Exit in an application and it doesn t really exit

User · Answer

Use  this FinishAndRemoveTask     - it closes application properly

User · Answer

Override     protected void onPause             super onPause            System exit 0

User · Answer

Not possible with 2 3  I search alot  and tried many apps  The best solution is to install both  go taskmanager  and  fast reboot   When use them together it will work  and will free the memory  Another option is to upgrade to android ice cream sandwich 4 0 4 which allow control  close  of apps

User · Answer

This is the way I did it   I just put   Intent intent   new Intent Main this  SOMECLASSNAME class   Main this startActivityForResult intent  0     inside of the method that opens an activity  then inside of the method of SOMECLASSNAME that is designed to close the app I put   setResult 0   finish      And I put the following in my Main class    Override protected void onActivityResult int requestCode  int resultCode  Intent data        if resultCode    0            finish

User · Answer

Simply write the following code in onBackPressed    Override public void onBackPressed            super onBackPressed           Creating an alert dialog to logout     AlertDialog Builder alertDialogBuilder   new AlertDialog Builder this       alertDialogBuilder setMessage  Do you want to Exit         alertDialogBuilder setPositiveButton  Yes               new DialogInterface OnClickListener                      Override                 public void onClick DialogInterface arg0  int arg1                        Intent intent   new Intent Intent ACTION MAIN                       intent addCategory Intent CATEGORY HOME                       startActivity intent                                          alertDialogBuilder setNegativeButton  No               new DialogInterface OnClickListener                      Override                 public void onClick DialogInterface arg0  int arg1                                              Showing the alert dialog     AlertDialog alertDialog   alertDialogBuilder create        alertDialog show

User · Answer

The best and shortest way to use the table System exit   System exit 0     The VM stops further execution and program will exit

User · Answer

i wanted to return to the home screen of my android device  so i simply used    moveTaskToBack true

User · Answer

This is how Windows Mobile has worked for    well    ever   Here s what Microsoft have to say on the matter   http   blogs msdn com windowsmobile archive 2006 10 05 The-Emperor-Has-No-Close aspx  is it sad that I remembered the title of the blog post all the way from 2006  I found the article on Google by searching  the emperor has no close  lol   In short      If the system needs more memory while   the app is in the background  it   ll   close the app   But  if the system   doesn   t need more memory  the app will   stay in RAM and be ready to come back   quickly the next time the user needs   it    Many comments in this question at O Reilly suggest that Android behaves in much the same way  closing applications that haven t been used for a while only when Android needs the memory they re using     Since this is a standard feature  then changing the behavior to forcefully close would be changing the user experience   Many users would be used to the gentle dismissal of their Android apps so when they dismiss one with the intention of returning to it after performing some other tasks  they may be rather frustrated that the state of the application is reset  or that it takes longer to open   I would stick with the standard behavior because it is what is expected

User · Answer

Calling the finish   method on an Activity has your desired effect on that current activity

User · Answer

Use of finishAffinity   may be an good option if you want to close all Activity of the app  As per the Android Docs-  Finish this activity as well as all activities immediately below it in the current task that have the same affinity

User · Answer

It s not possible using the framework APIs  It s at the discretion of the operating system  Android  to decide when a process should be removed or remain in memory  This is for efficiency reasons  if the user decides to relaunch the app  then it s already there without it having to be loaded into memory   So no  it s not only discouraged  it s impossible to do so

User · Answer

Android has a mechanism in place to close an application safely per its documentation   In the last Activity that is exited  usually the main Activity that first came up when the application started  just place a couple of lines in the onDestroy   method   The call to System runFinalizersOnExit true  ensures that all objects will be finalized and garbage collected when the the application exits   You can also kill an application quickly via android os Process killProcess android os Process myPid     if you prefer   The best way to do this is put a method like the following in a helper class and then call it whenever the app needs to be killed   For example in the destroy method of the root activity  assuming that the app never kills this activity    Also Android will not notify an application of the HOME key event  so you cannot close the application when the HOME key is pressed   Android reserves the  HOME key event to itself so that a developer cannot prevent users from leaving their application   However you can determine with the HOME key is pressed by setting a flag to true in a helper class that assumes that the HOME key has been pressed  then changing the flag to false when an event occurs that shows the HOME key was not pressed and then checking to see of the HOME key pressed in the onStop   method of the activity    Don t forget to handle the HOME key for any menus and in the activities that are started by the menus   The same goes for the SEARCH key   Below is some example classes to illustrate   Here s an example of a root activity that kills the application when it is destroyed   package android example           author Danny Remington - MacroSolve      public class HomeKey extends CustomActivity        public void onDestroy             super onDestroy                           Kill application when the root activity is killed                      UIHelper killApp true              Here s an abstract activity that can be extended to handle the HOME key for all activities that extend it   package android example           author Danny Remington - MacroSolve      import android app Activity  import android view Menu  import android view MenuInflater          Activity that includes custom behavior shared across the application  For    example  bringing up a menu with the settings icon when the menu button is    pressed by the user and then starting the settings activity when the user    clicks on the settings icon      public abstract class CustomActivity extends Activity       public void onStart             super onStart                           Check if the app was just launched  If the app was just launched then            assume that the HOME key will be pressed next unless a navigation            event by the user or the app occurs  Otherwise the user or the app            navigated to this activity so the HOME key was not pressed                       UIHelper checkJustLaunced               public void finish                           This can only invoked by the user or the app finishing the activity            by navigating from the activity so the HOME key was not pressed                      UIHelper homeKeyPressed   false          super finish               public void onStop             super onStop                           Check if the HOME key was pressed  If the HOME key was pressed then            the app will be killed  Otherwise the user or the app is navigating            away from this activity so assume that the HOME key will be pressed            next unless a navigation event by the user or the app occurs                      UIHelper checkHomeKeyPressed true              public boolean onCreateOptionsMenu Menu menu            MenuInflater inflater   getMenuInflater            inflater inflate R menu settings menu  menu                          Assume that the HOME key will be pressed next unless a navigation            event by the user or the app occurs                      UIHelper homeKeyPressed   true           return true             public boolean onSearchRequested                           Disable the SEARCH key                      return false            Here s an example of a menu screen that handles the HOME key           author Danny Remington - MacroSolve      package android example   import android os Bundle  import android preference PreferenceActivity          PreferenceActivity for the settings screen          see PreferenceActivity         public class SettingsScreen extends PreferenceActivity       protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           addPreferencesFromResource R layout settings screen              public void onStart             super onStart                           This can only invoked by the user or the app starting the activity by            navigating to the activity so the HOME key was not pressed                      UIHelper homeKeyPressed   false             public void finish                           This can only invoked by the user or the app finishing the activity            by navigating from the activity so the HOME key was not pressed                      UIHelper homeKeyPressed   false          super finish               public void onStop             super onStop                           Check if the HOME key was pressed  If the HOME key was pressed then            the app will be killed either safely or quickly  Otherwise the user            or the app is navigating away from the activity so assume that the            HOME key will be pressed next unless a navigation event by the user            or the app occurs                      UIHelper checkHomeKeyPressed true              public boolean onSearchRequested                           Disable the SEARCH key                      return false             Here s an example of a helper class that handles the HOME key across the app   package android example           author Danny Remington - MacroSolve                Helper class to help handling of UI      public class UIHelper       public static boolean homeKeyPressed      private static boolean justLaunched   true                  Check if the app was just launched  If the app was just launched then        assume that the HOME key will be pressed next unless a navigation event        by the user or the app occurs  Otherwise the user or the app navigated to        the activity so the HOME key was not pressed              public static void checkJustLaunced             if  justLaunched                homeKeyPressed   true              justLaunched   false            else               homeKeyPressed   false                                  Check if the HOME key was pressed  If the HOME key was pressed then the        app will be killed either safely or quickly  Otherwise the user or the        app is navigating away from the activity so assume that the HOME key will        be pressed next unless a navigation event by the user or the app occurs                  param killSafely                   Primitive boolean which indicates whether the app should be                   killed safely or quickly when the HOME key is pressed                  see   link UIHelper killApp              public static void checkHomeKeyPressed boolean killSafely            if  homeKeyPressed                killApp true             else               homeKeyPressed   true                                  Kill the app either safely or quickly  The app is killed safely by        killing the virtual machine that the app runs in after finalizing all          link Object s created by the app  The app is killed quickly by abruptly        killing the process that the virtual machine that runs the app runs in        without finalizing all   link Object s created by the app  Whether the        app is killed safely or quickly the app will be completely created as a        new app in a new virtual machine running in a new process if the user        starts the app again                  lt P gt          lt B gt NOTE  lt  B gt  The app will not be killed until all of its threads have        closed if it is killed safely          lt  P gt                  lt P gt          lt B gt NOTE  lt  B gt  All threads running under the process will be abruptly        killed when the app is killed quickly  This can lead to various issues        related to threading  For example  if one of those threads was making        multiple related changes to the database  then it may have committed some        of those changes but not all of those changes when it was abruptly        killed          lt  P gt                  param killSafely                   Primitive boolean which indicates whether the app should be                   killed safely or quickly  If true then the app will be killed                   safely  Otherwise it will be killed quickly              public static void killApp boolean killSafely            if  killSafely                                  Notify the system to finalize and collect all objects of the app                on exit so that the virtual machine running the app can be killed                by the system without causing issues  NOTE  If this is set to                true then the virtual machine will not be killed until all of its                threads have closed                              System runFinalizersOnExit true                                  Force the system to close the app down completely instead of                retaining it in the background  The virtual machine that runs the                app will be killed  The app will be completely created as a new                app in a new virtual machine running in a new process if the user                starts the app again                              System exit 0             else                                 Alternatively the process that runs the virtual machine could be                abruptly killed  This is the quickest way to remove the app from                the device but it could cause problems since resources will not                be finalized first  For example  all threads running under the                process will be abruptly killed when the process is abruptly                killed  If one of those threads was making multiple related                changes to the database  then it may have committed some of those                changes but not all of those changes when it was abruptly killed                              android os Process killProcess android os Process myPid

[android] How to close Android application?

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