Question

I have an application where you have to log in like an user with your password.

This application needs to be secure, so it needs to Log Out the user when he doesn´t tocuh the screen during a determinate period of time(let´s say, 5 minutes).

The problem is that, once the user is logged in, he can go through many activities, not only one, and I would like to know if there is a way in Android to know if the user can get Logged out after few minutes.

I was thinking about using the method onInterceptTouchEvent(MotionEvent ev), but the problem is that, ¿do I have to use this method on every activities? ¿there is another easier way to manage it in Android?

Thanks a lot!

Answer 1

Instead of implementing this on every Activity, you could create one Activity like this:

public class BaseActivity extends Activity

and implement onInterceptTouchEvent in your BaseActivity.

Then from all other Activities you will have to extend the BaseActivity

UPDATE:
You will have to use onTouch if you want to listen for events in whole screen. This requires that in every xml file of your Activity, you will have to give an id for the root view of your xml (Linearlayout, Relativelayout, Framelayout or whatever). So in order to let your BaseActivity get inputs from other Activities you will have to pass your root view to it, like this:

public class MyActivity extends BaseActivity{
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.my_activity);
        super.setRootView(findViewById(R.id.rootView));
    }
}

public class BaseActivity extends Activity implements OnTouchListener{

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    public void setRootView(View rootView){
        rootView.setOnTouchListener(this);
    }

    public boolean onTouch(View v, MotionEvent event) {
        Log.d("BaseActivity", "onTouch!");
        return super.onTouchEvent(event);
    }
}