Android: perfect way to clear all activity when Logout?

Question

All activities in my apps having Logout button and user can Logout from any activity. I want to send user to Login Activity without showing previous activity. for this i am using:

Following is the logout method delete session

public void logoutUser() {
    //clearing all data from sharedPreferences
    editor.clear();
    editor.commit();
    Intent intnt = new Intent(contxt, LoginActivity.class);
    // Closing all the Activities
    intnt.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    // Add new Flag to start new Activity
    intnt.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK );
    // Staring Login Activity
     contxt.startActivity(intnt);

}

from Second activity when user click on logout button then Logout method call. My Second activity class extends SherlockFragmentActivity.

public void Logout(MenuItem v) {
    sessionMngr.logoutUser();
}

I get to the login screen when I press the logout button, but when I press back button on the device it is showing the previous activities - I should go to the Android home screen when I press back button in the login screen.

I've seen some question on stackoverflow but not achieve my goal. somebody said me use android:noHistory="true" in manifest file but what happen when i am in Third activity and press back the button it is showing android home screen but it should go to second activity. I also tried FLAG_ACTIVITY_NO_HISTORY but this does not accomplish my goal either.

I don't Understand where I am wrong. Please does anyone have solution.

Thanks in advance

Answer 1

Try specifying both of these:

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);

Also to be safe, call a finish() after starting this activity.

Answer 2

The best way is to use a LocalBrodCastManager in your application while logout.

When the user press the logout button, you can send a local broadcast using below code.

@Override
public void onclick(View view){

  //do this on logout button click
  final String LOG_OUT = "event_logout";
  Intent intent = new Intent(LOG_OUT);
  //send the broadcast to all activities who are listening
  LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}

Now all the activity should listen to this broadcast. And the activity will look like

@Override 
    protected void onCreate(Bundle savedInstanceState) {

  // Register mMessageReceiver to receive messages.
  LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
      new IntentFilter(LOG_OUT));
}

// handler for received Intents for logout event 
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
      //do your code snippet here.
      finish();
  }
};

@Override
protected void onDestroy() {
  // Unregister since the activity is not visible
  LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
  super.onDestroy();
}

Note: If you have more than one activity, then it is recommended to extend all the activity from a base activity, and implement this local broadcast manager only in the base activity. So that you need to implement the logout code only in one place.

Answer 3

This is how I solved it :

Intent intent = new Intent(context, ActivityLogin.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);

Works with API >= 11