I want to draw line with glow effect like this The problem - i must generate this line in program in dependence on user's interaction ( the form of line will be generated in onTouchEvent - ACTION_MOVE ).

我可以生成这一效果的XML文件或绘图premaid位图？

Can i generate this effect without xml files or drawing premaid bitmap ?

推荐答案

我模仿这种效果是这样的：

I imitate this effect in this way :

我使用Path类来生成线，节省 MOVE_ACTION 的坐标事件生成路径的一部分我需要什么。

I use Path class to generate line and save coordinates of MOVE_ACTION event to generate only part of path what i need.

创建2 油漆（） S：

    _paintSimple = new Paint();
    _paintSimple.setAntiAlias(true);
    _paintSimple.setDither(true);
    _paintSimple.setColor(Color.argb(248, 255, 255, 255));
    _paintSimple.setStrokeWidth(20f);
    _paintSimple.setStyle(Paint.Style.STROKE);
    _paintSimple.setStrokeJoin(Paint.Join.ROUND);
    _paintSimple.setStrokeCap(Paint.Cap.ROUND);

    _paintBlur = new Paint();
    _paintBlur.set(_paintSimple);
    _paintBlur.setColor(Color.argb(235, 74, 138, 255));
    _paintBlur.setStrokeWidth(30f);
    _paintBlur.setMaskFilter(new BlurMaskFilter(15, BlurMaskFilter.Blur.NORMAL)); 

和借鉴两次我路径（）：

   @Override
protected void onDraw(Canvas canvas) {
    canvas.drawPath(mPath, _paintBlur);
    canvas.drawPath(mPath, _paintSimple);
}