自定义控件-画板，橡皮擦，刮刮乐

画板效果图

页面代码

public class ActionerView extends View {
   
    private Paint mPaint = new Paint();
    private Path mPath = new Path();//手指滑动路径
    private Canvas mCanvas;//缓存画布
    private Bitmap mBitmap;//缓存图片
    private float pointX, pointY;//触点坐标


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


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int width = getMeasuredWidth();
        int height = getMeasuredHeight();

        initPaint();//初始化画笔

        mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);

        mCanvas.drawPath(mPath, mPaint);
        canvas.drawBitmap(mBitmap, 0, 0, null);

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        pointX = event.getX();
        pointY = event.getY();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mPath.moveTo