如何使ImageView成圆形？

Question

我想做那样的事.

这是一个列表视图行,其中包含名称和用户图像.

我做了一些搜索并完成了图像循环,但不是完美的解决方案.任何帮助都会帮助我.

我的代码添加到Image Loader类

public Bitmap processBitmap(Bitmap bitmap) {
    int pixels = 0;
    if (mRound == 0)
        pixels = 120;
    else
        pixels = mRound;
    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;
}

谢谢.

Answer 1

你也可以使用这个功能...它的工作对我来说..

public Bitmap getRoundedShape(Bitmap scaleBitmapImage) {
    int targetWidth = 50;
    int targetHeight = 50;
    Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, 
                        targetHeight,Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(targetBitmap);
    Path path = new Path();
    path.addCircle(((float) targetWidth - 1) / 2,
        ((float) targetHeight - 1) / 2,
        (Math.min(((float) targetWidth), 
        ((float) targetHeight)) / 2),
        Path.Direction.CCW);

    canvas.clipPath(path);
    Bitmap sourceBitmap = scaleBitmapImage;
    canvas.drawBitmap(sourceBitmap, 
        new Rect(0, 0, sourceBitmap.getWidth(),
        sourceBitmap.getHeight()), 
        new Rect(0, 0, targetWidth, targetHeight), null);
    return targetBitmap;
}

Answer 2

这可能不会回答你的问题,但是,作为一种替代方案,你可以通过在一个FrameLayout例子中设置2个ImageView来模仿这种效果:一个在底部 - 这将是图片,一个在顶部 - 这将是一个灰色正方形,中间有一个圆圈,圆圈的"身体"是透明的.

这样您就不必进行任何位图处理.但是,选择一个更适合您需求的产品.

Answer 3

这要归功于答复.

Bitmap circleBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Paint paint = new Paint();
paint.setStrokeWidth(5);
Canvas c = new Canvas(circleBitmap);
 //This draw a circle of Gerycolor which will be the border of image.
c.drawCircle(bitmap.getWidth()/2, bitmap.getHeight()/2, bitmap.getWidth()/2, paint);
BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
paint.setAntiAlias(true);
paint.setShader(shader);
// This will draw the image.
c.drawCircle(bitmap.getWidth()/2, bitmap.getHeight()/2, bitmap.getWidth()/2-2, paint);

圆角图像使用imageLoader github.com/nostra13/Android-Universal-Image-Loader创建选项;

 DisplayImageOptions options = new DisplayImageOptions.Builder()
 // this will make circle, pass the width of image 
.displayer(new RoundedBitmapDisplayer(getResources().getDimensionPixelSize(R.dimen.image_dimen_??menu))) 
.cacheOnDisc(true) 
.build(); 
imageLoader.displayImage(url_for_image,ImageView,options);

或者U可以从squre使用Picasso Library.

Picasso.with(mContext).load(URL+b.image)
 .placeholder(R.drawable.profile) 
    .error(R.drawable.profile) 
    .transform(new RoundedTransformation(50, 4)) 
    .resizeDimen(R.dimen.list_detail_image_size, R.dimen.list_detail_image_size) 
    .centerCrop() 
    .into(v.im_user);

你可以在这里下载RoundedTrasformation 文件

重要提示:我在使用UIL时发现了一个问题.如果你没有在ImageView中放置xml属性android:contentDescription ="TODO".然后UIL显示简单的图像.希望大家都明白