HueDrawable.java 文件源码

@Override
public void draw(Canvas canvas) {
    Rect b = getBounds();

    Paint huePaint = new Paint();
    huePaint.setShader(new LinearGradient(0, 0, b.width(), 0,
            new int[]{
                    0xFFFF0000,
                    0xFFFFFF00,
                    0xFF00FF00,
                    0xFF00FFFF,
                    0xFF0000FF,
                    0xFFFF00FF,
                    0xFFFF0000
            },
            null,
            Shader.TileMode.REPEAT)
    );
    canvas.drawRect(b, huePaint);
}