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 DrawingView extends View {
    private Path drawPath;
    private Paint drawPaint;
    private float touchX, touchY;
    private static final float TOUCH_TOLERANCE = 4;

    public DrawingView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setupDrawing();
    }

    private void setupDrawing() {
        drawPath = new Path();
        drawPaint = new Paint();
        drawPaint.setColor(Color.BLACK);
        drawPaint.setAntiAlias(true);
        drawPaint.setStrokeWidth(10);
        drawPaint.setStyle(Paint.Style.STROKE);
        drawPaint.setStrokeJoin(Paint.Join.ROUND);
        drawPaint.setStrokeCap(Paint.Cap.ROUND);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawPath(drawPath, drawPaint);
    }

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

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                touchStart(x, y);
                invalidate();
                break;
            case MotionEvent.ACTION_MOVE:
                touchMove(x, y);
                invalidate();
                break;
            case MotionEvent.ACTION_UP:
                touchUp();
                invalidate();
                break;
        }
        return true;
    }

    private void touchStart(float x, float y) {
        drawPath.reset();
        drawPath.moveTo(x, y);
        touchX = x;
        touchY = y;
    }

    private void touchMove(float x, float y) {
        float dx = Math.abs(x - touchX);
        float dy = Math.abs(y - touchY);
        if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
            drawPath.quadTo(touchX, touchY, (x + touchX) / 2, (y + touchY) / 2);
            touchX = x;
            touchY = y;
        }
    }

    private void touchUp() {
        drawPath.lineTo(touchX, touchY);
    }
}