Android图片转换类 1. Bitmap去色,…

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;

    }

}