How to use onWindowFocusChanged() method?

Question

I am confused in how to trigger an event when the activity is changed. One thing that I know is using onWindowFocusChanged() method but I don\'t know how to use

Answer 1

Called when the current Window of the activity gains or loses focus. This is the best indicator of whether this activity is visible to the user. The default implementation clears the key tracking state, so should always be called.

@Override
public void onWindowFocusChanged(boolean hasFocas) {
    super.onWindowFocusChanged(hasFocas);
    //your code here
}

hasFocus boolean: Whether the window of this activity has focus.