Android--LinearGradient线性渐变

http://www.2cto.com/kf/201302/190741.html

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Paint paint = new Paint();  

        LinearGradient gradient = new LinearGradient(0, 0, 100, 100, Color.RED, Color.YELLOW, Shader.TileMode.MIRROR);  

        paint.setShader(gradient);  

        canvas.drawRect(0, 0, 100, 100, paint);  

        canvas.drawText("This is the shader", 100, 100, paint);