Question

有人设法使用RoundedBitmapDrawable吗？如果我错了，请纠正我，但根据我的理解，它会从常规矩形图像中生成圆形图像。

到目前为止我尝试过的是

RoundedBitmapDrawable.createRoundedBitmapDrawable(getResources(), BitmapFactory.decodeResource(getResources(), iconResource))

我试图实现的目标：将任何图像转换为圆形图像并使用ImageView显示它。

如果我把事情搞混了，我所说的都是无意义的。是否可以（或更简单）使用任何新框架？（Android L或新的支持库）

Answer 1

您需要设置转角半径。

Resources res = getResources();
Bitmap src = BitmapFactory.decodeResource(res, iconResource);
RoundedBitmapDrawable dr =
    RoundedBitmapDrawableFactory.create(res, src);
dr.setCornerRadius(Math.max(src.getWidth(), src.getHeight()) / 2.0f);
imageView.setImageDrawable(dr);

Answer 2

这可能是一个迟到的回复，但我希望它会对其他人有所帮助

如果您的图像具有相同的宽度和高度，那么您只需将setCircular设置为true即可获得如下的圆角位图

RoundedBitmapDrawable drawable = RoundedBitmapDrawableFactory.create(getResources(),your_bitmap);
drawable.setCircular(true);

Answer 3

我也找到了圆形图像视图以提高效率我已经搜索了所有第三方库我发现他们所有人都在创建新的位图，这是繁琐的任务列表中消耗更多的内存

refereed library：

http://ruibm.com/2009/06/16/rounded-corner-bitmaps-on-android/
https://github.com/vinc3m1/RoundedImageView
https://github.com/lopspower/CircularImageView

来自这个库，我用过

https://github.com/vinc3m1/RoundedImageView

，因为基于Romain Guy的原始示例支持圆角（和椭圆或圆圈）的快速ImageView（和Drawable）

不会创建原始位图的副本
不使用非硬件加速且没有消除锯齿的clipPath。
不使用setXfermode剪辑位图并将两次绘制到画布上。

Answer 4

我想建议另一个选择：

您可以使用此方法根据需要进行缩放，并避免此异常：

public static Bitmap scaleBitmapAndKeepRation(Bitmap TargetBmp, int reqHeightInPixels, int reqWidthInPixels) {
        if (TargetBmp != null) {

            if (TargetBmp.getWidth() >= TargetBmp.getHeight()) {

                TargetBmp = Bitmap.createBitmap(
                        TargetBmp,
                        TargetBmp.getWidth() / 2 - TargetBmp.getHeight() / 2,
                        0,
                        TargetBmp.getHeight(),
                        TargetBmp.getHeight()
                );

            } else {

                TargetBmp = Bitmap.createBitmap(
                        TargetBmp,
                        0,
                        TargetBmp.getHeight() / 2 - TargetBmp.getWidth() / 2,
                        TargetBmp.getWidth(),
                        TargetBmp.getWidth()
                );
            }

            if (TargetBmp != null) {
                try {
                    Matrix m = new Matrix();
                    m.setRectToRect(new RectF(0, 0, TargetBmp.getWidth(), TargetBmp.getHeight()), new RectF(0, 0, reqWidthInPixels, reqHeightInPixels), Matrix.ScaleToFit.FILL);
                    Bitmap scaledBitmap = Bitmap.createBitmap(TargetBmp, 0, 0, TargetBmp.getWidth(), TargetBmp.getHeight(), m, true);
                    return scaledBitmap;
                } catch (Exception e) {
                    Log.e("Utils", e.toString());
                    return null;
                }
            }
            return null;
        } else
            return null;
    }

Answer 5

我创建了一个Utility类来创建RoundedBitmapDrawables https://gist.github.com/lawloretienne/a91fb0ce40f083073d4b8939281b3ecb

适用于圆形和圆角方块。

public class RoundedBitmapDrawableUtility {

    public static RoundedBitmapDrawable getRoundedSquareBitmapDrawable(Context context, Bitmap originalBitmap, int cornerRadius){
        return getRoundedSquareBitmapDrawable(context, originalBitmap, cornerRadius, -1, -1);
    }


    public static RoundedBitmapDrawable getRoundedSquareBitmapDrawable(Context context, Bitmap originalBitmap, int cornerRadius, int borderWidth, int borderColor){
        int originalBitmapWidth = originalBitmap.getWidth();
        int originalBitmapHeight = originalBitmap.getHeight();

        if(borderWidth != -1 && borderColor != -1){
            Canvas canvas = new Canvas(originalBitmap);
            canvas.drawBitmap(originalBitmap, 0, 0, null);

            Paint borderPaint = new Paint();
            borderPaint.setStyle(Paint.Style.STROKE);
            borderPaint.setStrokeWidth(borderWidth);
            borderPaint.setAntiAlias(true);
            borderPaint.setColor(borderColor);

            int roundedRectDelta = (borderWidth/3);
            RectF rectF = new RectF(0 + roundedRectDelta, 0 + roundedRectDelta, originalBitmapWidth - roundedRectDelta, originalBitmapHeight - roundedRectDelta);
            canvas.drawRoundRect(rectF, cornerRadius, cornerRadius, borderPaint);
        }

        RoundedBitmapDrawable roundedImageBitmapDrawable = RoundedBitmapDrawableFactory.create(context.getResources(), originalBitmap);
        roundedImageBitmapDrawable.setCornerRadius(cornerRadius);
        roundedImageBitmapDrawable.setAntiAlias(true);
        return roundedImageBitmapDrawable;
    }

    public static RoundedBitmapDrawable getCircleBitmapDrawable(Context context, Bitmap originalBitmap){
        return getCircleBitmapDrawable(context, originalBitmap, -1, -1);
    }

    public static RoundedBitmapDrawable getCircleBitmapDrawable(Context context, Bitmap originalBitmap, int borderWidth, int borderColor){
        if(borderWidth != -1 && borderColor != -1) {
            Canvas canvas = new Canvas(originalBitmap);
            canvas.drawBitmap(originalBitmap, 0, 0, null);

            Paint borderPaint = new Paint();
            borderPaint.setStyle(Paint.Style.STROKE);
            borderPaint.setStrokeWidth(borderWidth);
            borderPaint.setAntiAlias(true);
            borderPaint.setColor(borderColor);

            int circleDelta = (borderWidth / 2) - DisplayUtility.dp2px(context, 1);
            int radius = (canvas.getWidth() / 2) - circleDelta;
            canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2, radius, borderPaint);
        }

        RoundedBitmapDrawable roundedImageBitmapDrawable = RoundedBitmapDrawableFactory.create(context.getResources(), originalBitmap);
        roundedImageBitmapDrawable.setCircular(true);
        roundedImageBitmapDrawable.setAntiAlias(true);
        return roundedImageBitmapDrawable;
    }
}

Answer 6

RoundedBitmapDrawable当前对非方形图像的处理方式并不是很好。它使内容延伸。

我建议使用替代方法，正如我在这里写的： How to have a circular, center-cropped imageView, without creating a new bitmap?

Answer 7

完整代码：

ImageView img= (ImageView) findViewById(R.id.yourimageid);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.yourpictureresource);

RoundedBitmapDrawable rnd = (RoundedBitmapDrawable) RoundedBitmapDrawableFactory.create(getResources(), bitmap);
rnd.setCircular(true);
img.setImageDrawable(rnd);

Answer 8

如果你有 imagePath 而不是位图，你可以像下面这样传递 imagePath：

// set round image
RoundedBitmapDrawable dr = RoundedBitmapDrawableFactory.create(getResources(), avatarImgPath);
dr.setCircular(true);
avatarImageView.setImageDrawable(dr);

如何使用RoundedBitmapDrawable

8 个答案: