public void attach ( ViewGroup . LayoutParams layoutParams ) { if ( systemOverlay ) { try { getWindowManager ( ) . addView ( this , layoutParams ) ; } catch ( SecurityException e ) { throw new SecurityException ( "Your application must have SYSTEM_ALERT_WINDOW " + "permission to create a system window." ) ; } } else { ( ( ViewGroup ) getActivityContentView ( ) ) . addView ( this , layoutParams ) ; } }
Attaches it to the content view with specified LayoutParams .