How to logout after killing all activities?

Issue

On my App, I have the following process to log on a user:

• The user enters its credentials on the MainActivity and is redirected to HomeActivity using that code for navigation:

  Intent accueilIntent = new Intent(getApplicationContext(), HomeActivity.class);
  accueilIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK
                         | Intent.FLAG_ACTIVITY_NEW_TASK);
  finish();
  startActivity(accueilIntent);
  

• When the user is on the HomeActivity, he is able to log out thanks to a log out button. Since the event is fired, I would like to kill all activities and redirect the user to the login activity (MainActivity). So The code which is fired on the event is the following:

  Intent intent = new Intent(this, MainActivity.class);
  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                      | Intent.FLAG_ACTIVITY_CLEAR_TOP
                      | Intent.FLAG_ACTIVITY_CLEAR_TASK);
  startActivity(intent);
  

• The user is well redirected to the MainPage. Then when I press the home button to get back on the Android home screen and then I come back to the App, the right MainActivity appears. However, when I press the native back button to return to the android home screen and then I come back to the App, the HomeActivity appears (the one that should be destroyed before) and not the MainActivity.

Does anyone can tell me why I'm coming back to HomeActivity and not MainActivity in this case?

Solution

1] add finish() before startActivity()

2] Add FLAG_ACTIVITY_NO_HISTORY flag.

Intent intent = new Intent(mContext, MainActivity.class);
                                intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                                startActivity(intent);

Answered By - Prachi