/**
 * 判断图片颜色是深色还是浅色
 * @param src
 * @return  true 图片为浅色
 */
public static boolean getBitmapPixColor(Bitmap src) {
    if (null == src) {
        return false;
    }
    int R = 0, G = 0, B = 0;
    int pixelColor;
    int height = src.getHeight();
    int width = src.getWidth();

    //获取RGB值
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            pixelColor = src.getPixel(x, y);
            R = Color.red(pixelColor);
            G = Color.green(pixelColor);
            B = Color.blue(pixelColor);
        }
    }
    //将获取的RGB值进行计算，由192来区分为深色/浅色
    int grayLevel = (int) (R * 0.299 + G * 0.587 + B * 0.114);
    return grayLevel > 192;
}

/**
 * 
 * @param drawable
 * @return
 */
public static Bitmap drawableToBitmap(Drawable drawable)
{
    //声明将要创建的bitmap
    Bitmap bitmap = null;
    //获取图片宽度
    int width = drawable.getIntrinsicWidth();
    //获取图片高度
    int height = drawable.getIntrinsicHeight();
    //图片位深，PixelFormat.OPAQUE代表没有透明度，RGB_565就是没有透明度的位深，否则就用ARGB_8888。详细见下面图片编码知识。
    Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
    //创建一个空的Bitmap
    bitmap = Bitmap.createBitmap(width,height,config);
    //在bitmap上创建一个画布
    Canvas canvas = new Canvas(bitmap);
    //设置画布的范围
    drawable.setBounds(0, 0, width, height);
    //将drawable绘制在canvas上
    drawable.draw(canvas);
    return bitmap;
}