Android实现圆形图像的两种方法(Glide和Picasso)

在app的build.gradle中引入：
// 加载图片
implementation 'com.github.bumptech.glide:glide:4.13.1'

// 如果涉及到网络加载图片，需要在manifest.xml文件中增加网络权限
<uses-permission android:name="android.permission.INTERNET" />

// 直接在java文件中引用库就OK
/**
* context：Context(with参数类型可以为Context、Activity、FragmentActivity、Fragment、View)
* uri：Uri(load参数类型可以为Bitmap、Drawable、String、Uri、File、Integer、URL、byte[]、Object)
* apply：RequestOptions.bitmapTransform(new CircleCrop())：加载圆形图片
* imageView：控件id
*/
Glide.with(context).load(uri).apply(RequestOptions.bitmapTransform(new CircleCrop())).into(imageView);

在app的build.gradle中引入：
// 加载网络图片相关
implementation "com.squareup.picasso:picasso:2.5.2"

// 直接在java文件中引用
/**
* context：Context
* uri：Uri(load参数类型可以为String、Uri、File、int)
* transform：new CircleTransform()：圆形图片工具类(下文有)
* imageView：控件id
*/
Picasso.with(context).load(uri).transform(new CircleTransform()).into(imageView);

package com.gaojc.top.util;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import com.squareup.picasso.Transformation;

/**
 * 圆形图片
 */
public class CircleTransform implements Transformation {

    @Override
    public Bitmap transform(Bitmap source) {
        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;
        Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
        if (squaredBitmap != source) {
            source.recycle();
        }
        Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());
        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint();
        BitmapShader shader = new BitmapShader(squaredBitmap,
                BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
        paint.setShader(shader);
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        squaredBitmap.recycle();
        return bitmap;
    }

    @Override
    public String key() {
        return "circle";
    }
}