On Logout, Clear Activity History Stack, Preventing "Back" Button from Opening Logged-In-Only Activities

On logout, clear Activity history stack, preventing back button from opening logged-in-only Activities

I can suggest you another approach IMHO more robust.
Basically you need to broadcast a logout message to all your Activities needing to stay under a logged-in status. So you can use the sendBroadcast and install a BroadcastReceiver in all your Actvities.
Something like this:

/** on your logout method:**/
Intent broadcastIntent = new Intent();
broadcastIntent.setAction("com.package.ACTION_LOGOUT");
sendBroadcast(broadcastIntent);

The receiver (secured Activity):

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    /**snip **/
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction("com.package.ACTION_LOGOUT");
    registerReceiver(new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d("onReceive","Logout in progress");
            //At this point you should start the login activity and finish this one
            finish();
        }
    }, intentFilter);
    //** snip **//
}

Prevent back button after logout in android

override the onBackPressed in your login activity, to do nothing..

public void onBackPressed() {
    //do nothing
}

Android: Remove all the previous activities from the back stack

The solution proposed here worked for me:

Java

Intent i = new Intent(OldActivity.this, NewActivity.class);
// set the new task and clear flags
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i);

Kotlin

val i = Intent(this, NewActivity::class.java)
// set the new task and clear flags
i.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
startActivity(i)

However, it requires API level >= 11.

How to prevent going back to the previous activity?

My suggestion would be to finish the activity that you don't want the users to go back to. For instance, in your sign in activity, right after you call startActivity, call finish(). When the users hit the back button, they will not be able to go to the sign in activity because it has been killed off the stack.

Android - Kill all activities on logout

You could use a BroadcastReceiver to listen for a "kill signal" in your other activities

http://developer.android.com/reference/android/content/BroadcastReceiver.html

In your Activities you register a BroadcastReceiver

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("CLOSE_ALL");
BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
    // close activity
  }
};
registerReceiver(broadcastReceiver, intentFilter);

Then you just send a broadcast from anywhere in your app

Intent intent = new Intent("CLOSE_ALL");
this.sendBroadcast(intent);

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