Glide加载圆形图片和自定义圆角图片和对指定的角加载圆角

先上效果图:

因注释很细,就不一一解释说明了!

1.Glide加载圆形图片:

自定义GlideCircleTransUtils继承BitmapTransformation,重写transform()方法;

  public class GlideCircleTransUtils extends BitmapTransformation {
    public GlideCircleTransUtils(Context context) {
        super(context);
    }

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return circleCrop(pool, toTransform);
    }

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;
        //获取资源的长宽,获取最小值 子位图的像素个数
        int size = Math.min(source.getWidth(), source.getHeight());
        // 子位图第一个像素在源位图的X坐标
        int x = (source.getWidth() - size) / 2;
        //子位图第一个像素在源位图的y坐标
        int y = (source.getHeight() - size) / 2;
        //创建新位图  source 源位图
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
        //返回一个正好匹配给定宽、高和配置的只包含透明像素的Bitmap
        // 如果BitmapPool中找不到这样的Bitmap，就返回null
        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        //当返回null 时,创建给定宽、高和配置的新位图
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }
        //画图
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        // 设置shader
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        //抗锯齿
        paint.setAntiAlias(true);
        float r = size / 2f;
        // 用设置好的画笔绘制一个圆
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    @Override
    public String getId() {
        return getClass().getName();
    }
}

使用:

  //加载圆图
        Glide.with(this).load(imgurl).transform(new GlideCircleTransUtils(this)).into(iv_circle);

2.Glide加载圆角图片:
自定义GlideRoundTransUtils继承BitmapTransformation,重写transform()方法;可自定义圆角度数;

public class GlideRoundTransUtils extends BitmapTransformation {

    private static float radius = 0f;

    public GlideRoundTransUtils(Context context) {
        this(context, 4);
    }

    public GlideRoundTransUtils(Context context, int dp) {
        super(context);
        this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
    }

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return roundCrop(pool, toTransform);
    }

    private static Bitmap roundCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;
        //返回一个正好匹配给定宽、高和配置的只包含透明像素的Bitmap
        // 如果BitmapPool中找不到这样的Bitmap，就返回null
        Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        //当返回null 时,创建给定宽、高和配置的新位图
        if (result == null) {
            result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        // 设置shader
        paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        //抗锯齿
        paint.setAntiAlias(true);
        //画矩形
        RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
        //绘制圆角矩形   (RectF对象,x方向上的圆角半径,y方向上的圆角半径,绘制时所使用的画笔)
        canvas.drawRoundRect(rectF, radius, radius, paint);
        return result;
    }

    @Override
    public String getId() {
        return getClass().getName() + Math.round(radius);
    }
}

使用:

 //加载圆角图片
        Glide.with(this).load(imgurl).transform(new GlideRoundTransUtils(this, 10)).into(iv_Round);

最后附下整体demo下载地址:
http://download.csdn.net/download/shanshan_1117/10256998

补充:
glide对指定角加载圆角
效果图:

不做介绍了.下面附上整体代码下载地址(次代码包含上边demo的整体代码):

http://download.csdn.net/download/shanshan_1117/10259431