圆形图片工具类

代码块

自己封装的圆形图片的工具类，有兴趣的可以拿走用法如下：
它与picasso联合使用，当然你也可以使用其他的图片加载框架。

Picasso.with(this).load(R.drawable.webwxgeticon).transform(new CircleTransform()).into(mImageView);

package com.shelljor.nenggo.utils;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Shader;

import com.squareup.picasso.Transformation;

/**
 * Created by shelljor on 2017/3/6.
 *  Picasso.with(this).load(R.drawable.webwxgeticon).transform(new CircleTransform()).into(mImageView);
 */

public class CircleTransform implements Transformation{
    @Override
    public Bitmap transform(Bitmap source) {
        Bitmap bitmap=Bitmap.createBitmap(source.getWidth(),source.getHeight(), Bitmap.Config.ARGB_8888);
        Paint paint=new Paint();
        paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP,
                Shader.TileMode.CLAMP));
        new Canvas(bitmap).drawCircle(source.getWidth()/2,source.getHeight()/2,
                source.getWidth()/2>source.getHeight()/2?source.getHeight()/2:source.getWidth()/2,paint);
        source.recycle();
        return bitmap;
    }

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