如何繪製透明漸變色

Question

在我的代碼：

paint.setColor(Color.GRAY); 
paint.setAlpha(80); 
canvas.drawPath(getPath2(), paint); 

public static Path getPath2() 
{ 
    Path mPath2 = new Path(); 



    mPath2.moveTo(pta2.x, pta2.y); 
    mPath2.lineTo(pta.x, pta.y); 

    mPath2.lineTo(ptb.x, ptb.y); 

    mPath2.quadTo(ptl.x, ptl.y, ptd.x, ptd.y); 

    mPath2.close(); 
    return mPath2; 
} 

你知道我的油漆畫一個灰色

，它不是透明的，並且逐步改變，我DONOT知道我是否應該使用paint.setColorFilter，你可以告訴我該怎麼辦

Answer 1

Paint paint = new Paint(); 
paint.setStyle(Style.FILL); 
LinearGradient gradient = new LinearGradient(fromx, fromy, tox, toy, new int[]{color1, color2, color3}, new float[]{0, 0.6f, 1}, TileMode.CLAMP); 
paint.setShader(gradient); 
canvas.drawPath(getPath2(), paint);