question: @ Override protected void onResume ( ) { if ( mWZCameraView != null ) mWZCameraView . setPreviewReadyListener ( this ) ; super . onResume ( ) ; if ( sGoCoderSDK != null && mWZCameraView != null ) { if ( mNinjaFace == null ) { Bitmap faceBitmap = BitmapFactory . decodeResource ( getResources ( ) , R . drawable . ninja_face ) ; mNinjaFace = new WZBitmap ( faceBitmap ) ; mNinjaFace . setPosition ( WZBitmap . CENTER , WZBitmap . CENTER ) ; mNinjaFace . setScale ( 0.50f , WZBitmap . SURFACE_WIDTH ) ; mNinjaFace . setVisible ( false ) ; mWZCameraView . registerFrameRenderer ( mNinjaFace ) ; } } }
target:  Android Activity lifecycle methods