获取图片亮度（亮色，正常，暗色）

两种方法获取图片亮度
（1）获取图片区域像素点亮度值后求平均值,该算法可以调整

public static boolean isDarkBitamp(Bitmap bitmap){
    boolean isDark = false;
    try {
        if (bitmap != null) {
            
            int darkPixelCount = 0;
            int x = bitmap.getWidth() / 2;
            int y = bitmap.getHeight() / 4;
            //取图片0-width/2,竖1个像素点height/4
            for (int i = 0; i < y; i++) {
                if (bitmap.isRecycled()) {
                    break;
                }
                int pixelValue = bitmap.getPixel(x, i);
                //取rgb值颜色
                if (isDark(Color.red(pixelValue), Color.green(pixelValue), Color.blue(pixelValue))) {
                    darkPixelCount++;
                }
            }
            isDark = darkPixelCount > y / 2;
            Log.i("BlurScreenshotWallpaperUtil", "isDartTheme isDark " + isDark+" darkPixelCount = "+darkPixelCount);
        }
    }catch (Exception e){
        Log.e("BlurScreenshotWallpaperUtil","read wallpaper error");
    }
    return isDark;
}


 //计算像素点亮度算法
 private static boolean isDark(int r,int g,int b) {
        return !(r * 0.299 + g * 0.578 + b * 0.114 >= 192);
 }

（2）通过Palette计算图片颜色亮度

public static boolean isDarkBitamp(Bitmap bitmap){
    boolean isDark = false;
    try {
        if (bitmap != null) {
            isDark = getBitmapSamplings(bitmap);
        }
    }catch (Exception e){
        Log.e("BlurScreenshotWallpaperUtil","read wallpaper error");
    }
    return isDark;
}

public static boolean getBitmapSamplings(Bitmap bitmap){
        Palette palette = Palette.from(bitmap)
                .setRegion(0, 0, bitmap.getWidth(),bitmap.getHeight())
                .clearFilters()
                .generate();
        return getBitmapPaletteDark(palette);
}

public static boolean getBitmapPaletteDark(Palette hotseatPalette) {
   if (hotseatPalette != null && isSuperLight(hotseatPalette)) {
            Log.d(TAG,"updateHotseatPalette isSuperLight");
            return false;
        } else if (hotseatPalette != null && isSuperDark(hotseatPalette)) {
            Log.d(TAG,"updateHotseatPalette isSuperDark");
            return true;
        } else {
            Log.d(TAG,"updateHotseatPalette normal");
            return true;
        }
    }
}

public static boolean isSuperLight(Palette p) {
    return !isLegibleOnWallpaper(Color.WHITE, p.getSwatches());
}

public static boolean isSuperDark(Palette p) {
    return !isLegibleOnWallpaper(Color.BLACK, p.getSwatches());
}

总结：

第二种方法原生使用更加准确

本文地址：https://blog.csdn.net/zhuxingchong/article/details/109635982