In App Update Android Java

Library Implement:

 // In App Update  
   implementation 'com.google.android.play:app-update:2.1.0'  

Variable :

 // Variable   
  private static final int MY_UPDATE_CODE = 101;  
   private AppUpdateManager appUpdateManager;  

Add This Code In Public Class

 private void checkForAppUpdates(){
        appUpdateManager = AppUpdateManagerFactory.create(MainActivity.this);

        Task appUpdateInfoTask = appUpdateManager.getAppUpdateInfo();

        appUpdateInfoTask.addOnSuccessListener(appUpdateInfo -> {
            if (appUpdateInfo.updateAvailability() == UpdateAvailability.UPDATE_AVAILABLE
                    // instead, pass in AppUpdateType.FLEXIBLE
                    && appUpdateInfo.isUpdateTypeAllowed(AppUpdateType.FLEXIBLE)) {

                // Start Update
                try {
                    appUpdateManager.startUpdateFlowForResult(appUpdateInfo, AppUpdateType.FLEXIBLE, MainActivity.this, MY_UPDATE_CODE
                    );
                } catch (IntentSender.SendIntentException e) {
                    throw new RuntimeException(e);
                }
            }
        });

        // Before starting an update, register a listener for updates.  (FOR FLEXIBLE)
        appUpdateManager.registerListener(listener);



    } // checkForAppUpdates End Here =============


@Override  
   protected void onStop() {  
     super.onStop();  
     // When status updates are no longer needed, unregister the listener. (FOR FLEXIBLE)  
     appUpdateManager.unregisterListener(listener);  
   }  
   
   // Checks that the update is not stalled during 'onResume()'.  
   @Override  
   protected void onResume() {  
     super.onResume();  
     appUpdateManager  
         .getAppUpdateInfo()  
         .addOnSuccessListener(appUpdateInfo -> {  
           if (appUpdateInfo.installStatus() == InstallStatus.DOWNLOADED) {  
             popupSnackbarForCompleteUpdate();  
           }  
         });  
   }  
   
   @Override  
   protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {  
     super.onActivityResult(requestCode, resultCode, data);  
     if (requestCode == MY_UPDATE_CODE){  
       if (resultCode != RESULT_OK ){  
         Log.d("ActivityResult", "onActivityResult: Update Failed: "+resultCode);  
       }  
     }  
   }  
   
   InstallStateUpdatedListener listener = state -> {  
     if (state.installStatus() == InstallStatus.DOWNLOADED) {  
       popupSnackbarForCompleteUpdate();  
     }  
   };  
   
   private void popupSnackbarForCompleteUpdate() {  
     Snackbar snackbar =  
         Snackbar.make( findViewById(android.R.id.content),  
             "An update has just been downloaded.",  
             Snackbar.LENGTH_INDEFINITE);  
     snackbar.setAction("INSTALL", view -> appUpdateManager.completeUpdate());  
     snackbar.setActionTextColor(  
         getResources().getColor(android.R.color.darker_gray));  
     snackbar.show();  
   }