How do I prevent the user from closing my app?

Question

I've an android application that will be used in a restaurant, so I want that users can't exit from the app. The only thing that users can, is using application.

(If possible only admin can exit from app, by logging in or restarting device, I don't know which is the best way).

Is there a solution or other way to do this?

Answer 1

you can override the onBackPressed method

@Override 
public void onBackPressed(){  
  Toast.MakeText(getApplicationContext(),"You Are Not Allowed to Exit the App", Toast.LENGTH_SHORT).show();
}

this will prevent the back button from exiting the application.

and then you will need to override the home button as well like

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_HOME) {
        Log.i("TEST", "Home Button");  // here you'll have to do something to prevent the button to go to the home screen 
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

EDIT: for new devices with android version 4.0.xx you'll have to override the recent apps button as well hope that helps you.