null-product

public class CanvasView extends View {
    private Bitmap mBitmap;
    List<List<Point>> mPoints;

    public CanvasView(Context context, AttributeSet attrs) {
        super(context, attrs);

        mBitmap = null;
        mPoints = null;
    }

null-product

public class MainActivity extends AppCompatActivity {

    static {
        System.loadLibrary("opencv_java3");
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);