如何在andorid画布中快速移动手指时使用路径绘制画笔或形状(当用户快速移动手指时生成缺失点)

public class CustomView extends View {
    private Path path;
    private Paint paint;

    private float startX, startY;

    public CustomView(Context context) {
        super(context);
        init();
    }

    public CustomView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        path = new Path();

        paint = new Paint();
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(5);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float x = event.getX();
        float y = event.getY();

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                startX = x;
                startY = y;
                path.moveTo(startX, startY);
                break;
            case MotionEvent.ACTION_MOVE:
                path.lineTo(x, y);
                break;
            case MotionEvent.ACTION_UP:
                // 绘制路径到画布上
                Canvas canvas = new Canvas();
                canvas.drawPath(path, paint);
                break;
        }

        invalidate();
        return true;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // 绘制路径到画布上
        canvas.drawPath(path, paint);
    }
}