创建一个CustomImageview，然后简单地覆盖它的onDraw()方法如下:

@Override
protected void onDraw(Canvas canvas) {

    float radius = this.getHeight()/2;
    Path path = new Path();
    RectF rect = new RectF(0, 0, this.getWidth(), this.getHeight());
    path.addRoundRect(rect, radius, radius, Path.Direction.CW);
    canvas.clipPath(path);
    super.onDraw(canvas);

}

如果你想要的代码自定义小部件以及:-

CircularImageView.java

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

import androidx.annotation.Nullable;

public class CircularImageView extends ImageView {

    private Drawable image;

    public CircularImageView(Context context) {
        super(context);

        init(null, 0);
    }

    public CircularImageView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);

        init(attrs, 0);
    }

    public CircularImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        init(attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        float radius = this.getHeight()/2;
        Path path = new Path();
        RectF rect = new RectF(0, 0, this.getWidth(), this.getHeight());
        path.addRoundRect(rect, radius, radius, Path.Direction.CW);
        canvas.clipPath(path);
        super.onDraw(canvas);

    }

    private void init(AttributeSet attrs, int defStyle) {
        TypedArray a = Utils.CONTEXT.getTheme().obtainStyledAttributes(attrs, R.styleable.CircularImageView, 0, 0);
        try {
            image = a.getDrawable(R.styleable.CircularImageView_src);
        } finally {
            a.recycle();
        }

        this.setImageDrawable(image);
    }
}

此外，在res/attrs.xml中添加以下代码来创建所需的属性

<declare-styleable name="CircularImageView">
        <attr name="src" format="reference" />
</declare-styleable>

我是这样做的，我在矢量图像中使用了背景色

ic_bg_picture.xml

 <vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="100dp"
    android:height="100dp"
    android:viewportWidth="100"
    android:viewportHeight="100">
  <path
      android:pathData="M100.6,95.5c0,-0.4 -0.1,-0.7 0,-1.1c-0.2,-0.7 -0.2,-1.4 -0.1,-2.1c0,-0.1 0,-0.2 0,-0.3c-0.1,-0.6 -0.1,-1.2 0,-1.8c-1,-1.3 -0.3,-2.9 -0.3,-4.3c-0.1,-28.7 -0.1,-57.3 -0.1,-86C68,-0.1 35.9,-0.1 3.8,-0.2C0.7,-0.2 0,0.5 0,3.6c0.1,32.1 0.1,64.2 0.1,96.2c31,0 62,-0.1 92.9,0.1c3.6,0 6.3,-0.2 7.5,-3.2C100.5,96.4 100.5,95.9 100.6,95.5zM46.3,95.2C26.4,94 2,74.4 3.8,46.8C5.1,27.2 24.4,2.7 52.6,4.6c20.2,1.4 43,21.3 41.5,45.1C96.1,72.4 73,96.8 46.3,95.2z"
      android:fillColor="#6200EE"/>
</vector>

在我的情况下，我创建了一个向量，并更改android:fillColor="#6200EE"

通过我背景的颜色

  <ImageView
    android:id="@+id/iv_profile_image"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:contentDescription="@string/app_name"
    app:srcCompat="@color/colorPrimaryDark" />

<ImageView
    android:id="@+id/container_profile_image"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:contentDescription="@string/app_name"
    app:srcCompat="@drawable/ic_bg_picture"/>

把这个答案贴出来供将来参考。你可以在com.google.android.material:material中使用ShapeableImageView。

<com.google.android.material.imageview.ShapeableImageView
    android:id="@+id/img_launcher_icon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_margin="5dp"
    android:adjustViewBounds="true"
    android:background="@android:color/transparent"
    android:elevation="5dp"
    android:maxWidth="50dp"
    android:maxHeight="50dp"
    android:scaleType="fitXY"
    android:src="@mipmap/ic_launcher"
    app:shapeAppearance="?attr/actionButtonStyle"
    app:shapeAppearanceOverlay="@style/imageViewRounded"
    app:strokeColor="@android:color/white" />

在你的styles.xml中添加imageviewraded样式

<style name="imageViewRounded">
    <item name="cornerFamily">rounded</item>
    <item name="cornerSize">51%</item>
</style>

如果没有添加，可以添加材料设计依赖项。

    implementation 'com.google.android.material:material:1.4.0'

设计是这样的

另外，这两个库可以帮助您。

https://github.com/vinc3m1/RoundedImageView

实现以下代码:

implementation 'com.makeramen:roundedimageview:2.3.0'

简单的用法:

<com.makeramen.roundedimageview.RoundedImageView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/imageView1"
        android:src="@drawable/photo1"
        android:scaleType="fitCenter"
        app:riv_corner_radius="30dip"
        app:riv_border_width="2dip"
        app:riv_border_color="#333333"
        app:riv_mutate_background="true"
        app:riv_tile_mode="repeat"
        app:riv_oval="true" />

https://github.com/chirag-kachhadiya/RoundedImageView

简单的用法:

实现以下代码:

implementation 'com.github.chirag-kachhadiya:RoundedImageView:1.0'



 <com.infinityandroid.roundedimageview.RoundedImageView
                android:layout_width="150dp"
                android:layout_height="wrap_content"
                android:layout_margin="10dp"
                android:adjustViewBounds="true"
                android:src="@drawable/the_hundred"
                app:corner_radius="10" />

只需使用这段简单的代码: 首先添加依赖项:

implementation 'de.hdodenhof:circleimageview:2.2.0'

然后在XML布局中添加以下代码

<de.hdodenhof.circleimageview.CircleImageView xmlns:app="http://schemas.android.com/apk/res-auto"
                                        android:id="@+id/Imgshaligram"
                                        android:layout_width="96dp"
                                        android:layout_height="96dp"
                                        android:src="@drawable/shaligram"
                                        app:civ_border_color="#d1b1b1"

                                        android:foregroundGravity="center"/>

我用shape = "oval"代替下面的"ring"。这对我很有效。为了保持图像在边界内，我使用<padding>并在<ImageView>中设置<adjustViewBounds>为true。我尝试过大小在50 x 50 px到200x200 px之间的图像。