添加延迟计时器

Question

FaceView.java

        public class FaceView extends View {
            private float radius;
            NormalFace normalFace;
            HappyFace happyFace;

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

                // get radius value
                TypedArray a = context.getTheme().obtainStyledAttributes(
                        attrs,
                        R.styleable.FaceView,
                        0, 0
                );

                try {
                    radius = a.getDimension(R.styleable.FaceView_radius, 20.0f);
                } finally {
                    a.recycle();
                }

                // initiate HappyFace class
                normalFace = new NormalFace(radius);
                happyFace = new HappyFace(radius);
            }

            Handler setDelay;
            Runnable startDelay;

            @Override
            protected void onDraw(final Canvas canvas) {
                super.onDraw(canvas);
                normalFace.draw(canvas);
                //delay timer
                setDelay = new Handler();
                startDelay = new Runnable() {
                    @Override
                    public void run() {
                        happyFace.draw(canvas);
                    }
                };
                setDelay.postDelayed(startDelay,5000);
            }

FaceView.java用于在画布中显示不同的面部表情。我想在FaceView.java中添加一个延迟计时器，以便在计时器完成倒计时后，正常面部的显示可以变为幸福的面部。

但该应用程序被迫关闭。有人可以帮我吗？