Preventing user from returning to caller activity

Question

I am writing a simple application where the mainActivity invokes a secondActivity. Is there a method I can use to prevent the user from simply pressing back to return to the calling activity?

Answer 1

Start your Second activity this way:

Intent secActivity = new Intent(getApplicationContext(),
                secActivity.class);
        startActivity(secActivity);
        MainActivity.this.finish();

Answer 2

If you wanted to prevent the user to ever go back to the mainActivity , you should call the secondActivity like this:

  Intent intent = new Intent(MainActivity.this, SecondActivity.class);
  intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
  startActivity(intent);

That way pressing back will exit your application.

Answer 3

If you want to block back hardware key, put this to your SecondActivity:

@Override
public void onBackPressed() {
    // Blocks back button
}

If you want to close your FirstActivity so that users wont be able to visit it again, start your SecondActivity like this:

Intent i = new Intent(FirstActivity.this, SecondActivity.class);
startActivity(i);
FirstActivity.this.finish();