How to show a dialog to confirm that the user wishes to exit an Android Activity

Question

I ve been trying to show a  Do you want to exit   type of dialog when the user attempts to exit an Activity     However I can t find the appropriate API hooks   Activity onUserLeaveHint   initially looked promising  but I can t find a way to stop the Activity from finishing

User · Answer

Override public void onBackPressed         new AlertDialog Builder this              setMessage  Are you sure you want to exit                setCancelable false              setPositiveButton  Yes   new DialogInterface OnClickListener                    public void onClick DialogInterface dialog  int id                       ExampleActivity super onBackPressed                                               setNegativeButton  No   null              show

User · Answer

Just put this code in your first activity    Override     public void onBackPressed             if  drawerLayout isDrawerOpen GravityCompat END                 drawerLayout closeDrawer GravityCompat END                     else      if your using fragment then you can do this way             int fragments   getSupportFragmentManager   getBackStackEntryCount                if  fragments    1    new AlertDialog Builder this              setMessage  Are you sure you want to exit                setCancelable false              setPositiveButton  Yes   new DialogInterface OnClickListener                    public void onClick DialogInterface dialog  int id                        finish                                               setNegativeButton  No   null              show                    else                   if  getFragmentManager   getBackStackEntryCount    gt  1                        getFragmentManager   popBackStack                      else               super onBackPressed

User · Answer

in China  most App will confirm the exit by  click twice     boolean doubleBackToExitPressedOnce   false    Override public void onBackPressed         if  doubleBackToExitPressedOnce            super onBackPressed            return             this doubleBackToExitPressedOnce   true      Toast makeText this   Please click BACK again to exit   Toast LENGTH SHORT  show         new Handler   postDelayed new Runnable               Override         public void run                 doubleBackToExitPressedOnce false                                          2000

User · Answer

Using Lambda       new AlertDialog Builder this  setMessage getString R string exit msg            setTitle getString R string info            setPositiveButton getString R string yes    arg0  arg1  - gt                moveTaskToBack true               finish                        setNegativeButton getString R string no    arg0  arg1  - gt                        show      You also need to set level language to support java 8 in your gradle build   compileOptions          targetCompatibility 1 8        sourceCompatibility 1 8

User · Answer

Have modified  user919216 code    and made it compatible with WebView   Override public void onBackPressed         if  webview canGoBack              webview goBack               else            AlertDialog Builder builder   new AlertDialog Builder this   builder setMessage  Are you sure you want to exit            setCancelable false          setPositiveButton  Yes   new DialogInterface OnClickListener                public void onClick DialogInterface dialog  int id                    finish                                   setNegativeButton  No   new DialogInterface OnClickListener                public void onClick DialogInterface dialog  int id                    dialog cancel                            AlertDialog alert   builder create    alert show

User · Answer

I d prefer to exit with double tap on the back button than with an exit Dialog   In this solution  it show a toast when go back for the first time  warning that another back press will close the App  In this example less than 4 seconds   private Toast toast  private long lastBackPressTime   0    Override public void onBackPressed       if  this lastBackPressTime  lt  System currentTimeMillis   - 4000        toast   Toast makeText this   Press back again to close this app   4000       toast show        this lastBackPressTime   System currentTimeMillis        else       if  toast    null        toast cancel          super onBackPressed           Token from  http   www androiduipatterns com 2011 03 back-button-behavior html

User · Answer

First remove super onBackPressed    from onbackPressed   method than and below code    Override public void onBackPressed         AlertDialog Builder builder   new AlertDialog Builder this       builder setMessage  Are you sure you want to exit                setCancelable false              setPositiveButton  Yes   new DialogInterface OnClickListener                    public void onClick DialogInterface dialog  int id                        MyActivity this finish                                               setNegativeButton  No   new DialogInterface OnClickListener                    public void onClick DialogInterface dialog  int id                        dialog cancel                                        AlertDialog alert   builder create        alert show

User · Answer

In Android 2 0  this would look like    Override public void onBackPressed         new AlertDialog Builder this           setIcon android R drawable ic dialog alert           setTitle  Closing Activity            setMessage  Are you sure you want to close this activity             setPositiveButton  Yes   new DialogInterface OnClickListener                  Override         public void onClick DialogInterface dialog  int which                finish                               setNegativeButton  No   null       show        In earlier versions it would look like    Override public boolean onKeyDown int keyCode  KeyEvent event          Handle the back button     if keyCode    KeyEvent KEYCODE BACK              Ask the user if they want to quit         new AlertDialog Builder this           setIcon android R drawable ic dialog alert           setTitle R string quit           setMessage R string really quit           setPositiveButton R string yes  new DialogInterface OnClickListener                   Override             public void onClick DialogInterface dialog  int which                       Stop the activity                 YourClass this finish                                           setNegativeButton R string no  null           show             return true            else           return super onKeyDown keyCode  event

User · Answer

Another alternative would be to show a Toast Snackbar on the first back press asking to press back again to Exit  which is a lot less intrusive than showing an AlertDialog to confirm if user wants to exit the app   You can use the DoubleBackPress Android Library to achieve this with a few lines of code  Example GIF showing similar behaviour   To begin with  add the dependency to your application    dependencies       implementation  com github kaushikthedeveloper double-back-press 0 0 1        Next  in your Activity  implement the required behaviour      set the Toast to be shown on FirstBackPress  ToastDisplay - builtin template     can be replaced by custom action  new FirstBackPressAction       FirstBackPressAction firstBackPressAction   new ToastDisplay   standard this       set the Action on DoubleBackPress DoubleBackPressAction doubleBackPressAction   new DoubleBackPressAction          Override     public void actionCall                TODO   Exit the application         finish            System exit 0                setup DoubleBackPress behaviour   close the current Activity DoubleBackPress doubleBackPress   new DoubleBackPress            withDoublePressDuration 3000         msec - wait for second back press          withFirstBackPressAction firstBackPressAction           withDoubleBackPressAction doubleBackPressAction     Finally  set this as the behaviour on back press    Override public void onBackPressed         doubleBackPress onBackPressed

User · Answer

I like a  GLee approach and using it with fragment like below    Override public void onBackPressed         if isTaskRoot              new ExitDialogFragment   show getSupportFragmentManager    null         else           super onBackPressed              Dialog using Fragment   public class ExitDialogFragment extends DialogFragment         Override     public Dialog onCreateDialog Bundle savedInstanceState            return new AlertDialog Builder getActivity                 setTitle R string exit question               setPositiveButton android R string yes  new DialogInterface OnClickListener                      Override                 public void onClick DialogInterface dialog  int which                        getActivity   finish                                                  setNegativeButton android R string no  new DialogInterface OnClickListener                      Override                 public void onClick DialogInterface dialog  int which                        getDialog   cancel                                                  create

User · Answer

If you are not sure if the call to  back  will exit the app  or will take the user to another activity  you can wrap the above answers in a check  isTaskRoot    This can happen if your main activity can be added to the back stack multiple times  or if you are manipulating your back stack history     if isTaskRoot          AlertDialog Builder builder   new AlertDialog Builder this       builder setMessage  Are you sure you want to exit            setCancelable false          setPositiveButton  Yes   new DialogInterface OnClickListener                public void onClick DialogInterface dialog  int id                    YourActivity super onBackPressed                                 setNegativeButton  No   new DialogInterface OnClickListener                public void onClick DialogInterface dialog  int id                    dialog cancel                                AlertDialog alert   builder create        alert show       else       super onBackPressed

[android] How to show a dialog to confirm that the user wishes to exit an Android Activity?

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