Close application and launch home screen on Android

Question

I have two different activities  The first launches the second one  In the second activity  I call System exit 0  in order to force the application to close  but the first activity is automatically displayed instead of the application returning to the home screen  How can I avoid this  and get the application to return to the home screen

User · Answer

android os Process killProcess android os Process myPid     works fine  but it is recommended to let the Android platform worry about the memory management -

User · Answer

When you launch the second activity  finish   the first one immediately   startActivity new Intent        finish

User · Answer

I solved a similar problem  MainActivity starts BrowserActivity  and I need to close the app  when user press Back in BrowserActivity - not to return in MainActivity  So  in MainActivity   public class MainActivity extends AppCompatActivity       private static final String TAG    sm500 Rmt MainActivity       private boolean m IsBrowserStarted   false    and then  in OnResume        Override protected void onResume         super onResume        if m IsBrowserStarted            Log w TAG   onResume  but it s return from browser  just exit             finish            return            Log w TAG   onResume          then continue OnResume  And  when start BrowserActivity       Intent intent   new Intent this  BrowserActivity class       intent putExtra getString R string IPAddr   ip       startActivity intent       m IsBrowserStarted   true    And it looks like it works good   -

User · Answer

Start the second activity with startActivityForResult and in the second activity return a value  that once in the onActivityResult method of the first activity closes the main application  I think this is the correct way Android does it

User · Answer

You should really think about not exiting the application  This is not how Android apps usually work

User · Answer

Use the finish method  It is the simpler and easier method   this finish

User · Answer

I use this   1  The parent activity call the secondary activity with the method  startActivityForResult   2  In the secondary activity when is closing   int exitCode   1     Select the number you want setResult exitCode   finish      3  And in the parent activity override the method  onActivityResult    public void onActivityResult int requestCode  int resultCode  Intent data        super onActivityResult requestCode  resultCode  data       int exitCode   1      if resultCode    exitCode            super setResult exitCode      use this if you have more than 2 activities         finish              This works fine for me

User · Answer

Keep in mind that when working with applications that use persistent socket connections  the finish   method does not release the connection  Under normal circumstances  finish   is the best option  but if you absolutely need to exit an app and release all resource it s using then use killProcess  I ve had no problems using it

User · Answer

You can not do System exit    it s not safe   You can do this one  Process killProcess Process myPid

User · Answer

Try the following  It works for me   ActivityManager am    ActivityManager  this getSystemService ACTIVITY SERVICE   List lt ActivityManager RunningTaskInfo gt  taskInfo   am getRunningTasks 1    ComponentName componentInfo   taskInfo get 0  topActivity  am restartPackage componentInfo getPackageName

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   For example   public void onDestroy         super onDestroy                   Notify the system to finalize and collect all objects of the        application on exit so that the process running the application can        be killed by the system without causing issues  NOTE  If this is set        to true then the process will not be killed until all of its threads        have closed              System runFinalizersOnExit true                  Force the system to close the application down completely instead of        retaining it in the background  The process that runs the application        will be killed  The application will be completely created as a new        application in a new process if the user starts the application        again              System exit 0       Finally 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

User · Answer

Short answer  call moveTaskToBack true  on your Activity instead of System exit     This will hide your application until the user wants to use it again   The longer answer starts with another question  why do you want to kill your application   The Android OS handles memory management and processes and so on so my advice is just let Android worry about this for you   If the user wants to leave your application they can press the Home button and your application will effectively disappear   If the phone needs more memory later the OS will terminate your application then   As long as you re responding to lifecycle events appropriately  neither you nor the user needs to care if your application is still running or not   So if you want to hide your application call moveTaskToBack   and let Android decide when to kill it

User · Answer

You are wrong  There is one way to kill an application  In a class with super class Application  we use some field  for example  killApp  When we start the splash screen  first activity  in onResume    we set a parameter for false for field killApp  In every activity which we have when onResume   is called in the end  we call something like that   if AppClass killApp        finish      Every activity which is getting to the screen have to call onResume    When it is called  we have to check if our field killApp is true  If it is true  current activities call finish    To invoke the full action  we use the next construction  For example  in the action for a button   AppClass setkillApplication true      finish       return

User · Answer

You can also specify noHistory    true  in the tag for first activity or finish the first activity as soon as you start the second one as David said      AFAIK   force close  kills the process which hosts the JVM in which your application runs and System exit   terminates the JVM running your application instance  Both are form of abrupt terminations and not advisable for normal application flow     Just as catching exceptions to cover logic flows that a program might undertake  is not advisable

User · Answer

It is not recommended  but you can still use this  Better go with this solution in case you need to quit the app   According to me  the best solution is to finish every activity in your app like below   Step 1  Maintain a static variable in mainactivity  Say   public static boolean isQuit   false    Step 2  On click event of an button  set this variable to true   mainactivity isQuit   true  finish      Step 3  And in every activity of your application  have the onrestart method as below    Override protected void onRestart            TODO Auto-generated method stub     super onRestart        if mainactivity isQuit          finish

User · Answer

The easiest way for achieving this is given below  without affecting Android s native memory management  There is no process killing involved     Launch an activity using this Intent   Intent intent   new Intent this  FinActivity class   intent setFlags Intent FLAG ACTIVITY CLEAR TOP   startActivity intent   finish     In the target activity FinActivity class  call finish   in onCreate    Steps Explained    You create an intent that erases all other activities  FLAG ACTIVITY CLEAR TOP  and delete the current activity  The activity destroys itself  An alternative is that you can make an splash screen in finActivity  This is optional

User · Answer

This is what I did to close the application  In my application I have a base activity class  I added a static flag called  applicationShutDown   When I need to close the application I set it to true   In the base activity onCreate and onResume after calling the super calls I test this flag  If the  applicationShutDown  is true I call finish on the current Activity   This worked for me   protected void onResume         super onResume        if BaseActivity shutDownApp                finish            return

User · Answer

Say you have activity stack like A B C D E  You are at activity D  and you want to close your app  This is what you wil do -   In Activity from where you want to close  Activity D -  Intent intent   new Intent D this A class   intent putExtra  exit    exit    intent setFlags Intent FLAG ACTIVITY CLEAR TOP  Intent FLAG ACTIVITY SINGLE TOP   startActivity intent     In your RootActivity  ie your base activity  here Activity A  -    Override     protected void onNewIntent Intent intent            super onNewIntent intent           if  intent hasExtra  exit                  setIntent intent                         Override     protected void onResume             super onResume            if  getIntent      null                if    exit   equalsIgnoreCase getIntent   getStringExtra   exit                        onBackPressed                                    onNewIntent is used because if activity is alive  it will get the first intent that started it  Not the new one   For more detail - Documentation

User · Answer

It s actually quiet easy   The way I do this is by saving a flag in a static variable available to all  Then  when I exit  I set this flag and all my activities check this flag onResume  If the flag is set then I issue the System exit on that activity   That way all activities will check for the flag and will close gracefully if the flag is set

User · Answer

I use this method to close the Activities   public static void closeAllBelowActivities Activity current        boolean flag   true      Activity below   current getParent        if  below    null          return      System out println  Below Parent      below getClass         while  flag            Activity temp   below          try               below   temp getParent                temp finish              catch  Exception e                flag   false

User · Answer

Run the second activity using start activity for result   Intent intent   new Intent FirstActivity this  SecondActivity class      This line is important intent addFlags Intent FLAG ACTIVITY REORDER TO FRONT    startActivityForResult intent  REQUEST CODE     Add this function to the first Activity    Override public void onActivityResult int requestCode  int resultCode  Intent data        super onActivityResult requestCode  resultCode  data       if rquestCode    REQUEST CODE          if resultCode    RESULT CANCELED              finish        And add this to the second Activity    Override public boolean onKeyDown int keyCode  KeyEvent event         if  keyCode    KeyEvent KEYCODE BACK  amp  amp  event getRepeatCount      0             Log i TAG   Back key pressed            setResult RESULT CANCELED           finish            return true            return super onKeyDown keyCode  event

[android] Close application and launch home screen on Android

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