我已经通过自定义ImageView完成:

public class RoundRectCornerImageView extends ImageView {

    private float radius = 18.0f;
    private Path path;
    private RectF rect;

    public RoundRectCornerImageView(Context context) {
        super(context);
        init();
    }

    public RoundRectCornerImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public RoundRectCornerImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        path = new Path();

    }

    @Override
    protected void onDraw(Canvas canvas) {
        rect = new RectF(0, 0, this.getWidth(), this.getHeight());
        path.addRoundRect(rect, radius, radius, Path.Direction.CW);
        canvas.clipPath(path);
        super.onDraw(canvas);
    }
}

使用方法:

<com.mypackage.RoundRectCornerImageView
     android:id="@+id/imageView"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="@drawable/image"
     android:scaleType="fitXY" />

输出:

希望这对你有所帮助。

这里使用ImageLoader

创建DisplayImageOptions:

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);

或者你也可以从Square上使用毕加索图书馆。

Picasso.with(mContext)
    .load(com.app.utility.Constants.BASE_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RoundedTransformation文件 在这里

您应该扩展ImageView并绘制自己的圆角矩形。

如果你想在图像周围添加一个框架，你也可以在布局中将圆形框架叠加在图像视图的顶部。

例如，通过使用FrameLayout将帧叠加到原始图像上。FrameLayout的第一个元素将是你想要显示的图像。然后添加另一个ImageView与框架。第二个ImageView将显示在原始ImageView的顶部，因此Android将在原始ImageView上方绘制它的内容。

使用这个得到圆形图像与边界

    public static Bitmap getCircularBitmapWithBorder(Bitmap bitmap, int bordercolor) {
    if (bitmap == null || bitmap.isRecycled()) {
        return null;
    }
    int borderWidth=(int)(bitmap.getWidth()/40);
    final int width = bitmap.getWidth() + borderWidth;
    final int height = bitmap.getHeight() + borderWidth;

    Bitmap canvasBitmap = Bitmap.createBitmap(width, height,
            Bitmap.Config.ARGB_8888);
    BitmapShader shader = new BitmapShader(bitmap, TileMode.CLAMP,
            TileMode.CLAMP);
    Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setShader(shader);

    Canvas canvas = new Canvas(canvasBitmap);
    float radius = width > height ? ((float) height) / 2f
            : ((float) width) / 2f;
    canvas.drawCircle(width / 2, height / 2, radius, paint);
    paint.setShader(null);
    paint.setStyle(Paint.Style.STROKE);
    paint.setColor(bordercolor);
    paint.setStrokeWidth(borderWidth);
    canvas.drawCircle(width / 2, height / 2, radius - borderWidth / 2,
            paint);
    return canvasBitmap;
}

一个快速的xml解决方案-

<android.support.v7.widget.CardView
            android:layout_width="40dp"
            android:layout_height="40dp"
            app:cardElevation="0dp"
            app:cardCornerRadius="4dp">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rounded_user_image"
        android:scaleType="fitXY"/>

</android.support.v7.widget.CardView>

你可以在CardView上设置你想要的宽度，高度和半径，在ImageView上设置scaleType。

对于AndroidX，使用< AndroidX .cardview.widget. cardview >

我使用了一个自定义视图，我在其他视图的顶部布局，它只是画了4个小倒角，颜色与背景相同。

优点:

不分配位图。 适用于任何你想要应用圆角的视图。 适用于所有API级别;)

代码:

public class RoundedCornersView extends View {
    private float mRadius;
    private int mColor = Color.WHITE;
    private Paint mPaint;
    private Path mPath;

    public RoundedCornersView(Context context) {
        super(context);
        init();
    }

    public RoundedCornersView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();

        TypedArray a = context.getTheme().obtainStyledAttributes(
                attrs,
                R.styleable.RoundedCornersView,
                0, 0);

        try {
            setRadius(a.getDimension(R.styleable.RoundedCornersView_radius, 0));
            setColor(a.getColor(R.styleable.RoundedCornersView_cornersColor, Color.WHITE));
        } finally {
            a.recycle();
        }
    }

    private void init() {
        setColor(mColor);
        setRadius(mRadius);
    }

    private void setColor(int color) {
        mColor = color;
        mPaint = new Paint();
        mPaint.setColor(mColor);
        mPaint.setStyle(Paint.Style.FILL);
        mPaint.setAntiAlias(true);

        invalidate();
    }

    private void setRadius(float radius) {
        mRadius = radius;
        RectF r = new RectF(0, 0, 2 * mRadius, 2 * mRadius);
        mPath = new Path();
        mPath.moveTo(0,0);
        mPath.lineTo(0, mRadius);
        mPath.arcTo(r, 180, 90);
        mPath.lineTo(0,0);
        invalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {

        /*This just draws 4 little inverted corners */

        int w = getWidth();
        int h = getHeight();
        canvas.drawPath(mPath, mPaint);
        canvas.save();
        canvas.translate(w, 0);
        canvas.rotate(90);
        canvas.drawPath(mPath, mPaint);
        canvas.restore();
        canvas.save();
        canvas.translate(w, h);
        canvas.rotate(180);
        canvas.drawPath(mPath, mPaint);
        canvas.restore();
        canvas.translate(0, h);
        canvas.rotate(270);
        canvas.drawPath(mPath, mPaint);
    }
}