Android图片转换类 1. Bitmap去色,…

最新推荐文章于 2021-06-14 23:58:47 发布

bensantan

最新推荐文章于 2021-06-14 23:58:47 发布

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本文链接：https://blog.youkuaiyun.com/bensantan/article/details/40353399

本文介绍了一个Java类ImageTools，该类提供了将图片转换为灰度图像及添加圆角的功能。其中包括两个主要方法：toGrayscale用于将彩色图片转换为灰度图像；toRoundCorner用于给图片添加指定像素的圆角效果。

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public class ImageTools {

    

    

    public static Bitmap toGrayscale(Bitmap bmpOriginal) {

        int width, height;

        height = bmpOriginal.getHeight();

        width = bmpOriginal.getWidth();    



        Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);

        Canvas c = new Canvas(bmpGrayscale);

        Paint paint = new Paint();

        ColorMatrix cm = new ColorMatrix();

        cm.setSaturation(0);

        ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);

        paint.setColorFilter(f);

        c.drawBitmap(bmpOriginal, 0, 0, paint);

        return bmpGrayscale;

    }

    

    

    

    public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {

        return toRoundCorner(toGrayscale(bmpOriginal), pixels);

    }

    

    

    public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {



        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap

                .getHeight(), Config.ARGB_8888);

        Canvas canvas = new Canvas(output);



        final int color = 0xff424242;

        final Paint paint = new Paint();

        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

        final RectF rectF = new RectF(rect);

        final float roundPx = pixels;



        paint.setAntiAlias(true);

        canvas.drawARGB(0, 0, 0, 0);

        paint.setColor(color);

        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);



        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

        canvas.drawBitmap(bitmap, rect, rect, paint);



        return output;

    }



    

    

    public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable, int pixels) {

        Bitmap bitmap = bitmapDrawable.getBitmap();

        bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));

        return bitmapDrawable;

    }

}