Android Glide加载圆形图片，设置白色边框

之前加载圆形图片，一般都是自定义view实现。后来用Glide加载图片，Glide可以很方便的实现圆形加载并且也还可以设置变色边框。
关于Glide的加载在这里不详细说了，主要说一下自定义BitmapTransformation来实现圆形图片加载

 static class GlideCircleTransform extends BitmapTransformation {

private Paint mBorderPaint;
private float mBorderWidth;

public GlideCircleTransform(Context context) {
super(context);
        }

public GlideCircleTransform(Context context, int borderWidth, int borderColor) {
super(context);
            mBorderWidth = Resources.getSystem().getDisplayMetrics().density * borderWidth;

            mBorderPaint = new Paint();
            mBorderPaint.setDither(true);
            mBorderPaint.setAntiAlias(true);
            mBorderPaint.setColor(borderColor);
            mBorderPaint.setStyle(Paint.Style.STROKE);
            mBorderPaint.setStrokeWidth(mBorderWidth);
        }


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

private Bitmap circleCrop(BitmapPool pool, Bitmap source) {
if (source == null) return null;

int size = (int) (Math.min(source.getWidth(), source.getHeight()) - (mBorderWidth / 2));
int x = (source.getWidth() - size) / 2;
int y = (source.getHeight() - size) / 2;
// TODO this could be acquired from the pool too
            Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
            Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
if (result == null) {
                result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
            }
            Canvas canvas = new Canvas(result);
            Paint paint = new Paint();
            paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
            paint.setAntiAlias(true);
float r = size / 2f;
            canvas.drawCircle(r, r, r, paint);
if (mBorderPaint != null) {
float borderRadius = r - mBorderWidth / 2;
                canvas.drawCircle(r, r, borderRadius, mBorderPaint);
            }
return result;
        }

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

然后在用glide加载的时候

//带白色边框的圆形图片加载
 Glide.with(mContext).load(path).centerCrop().placeholder(R.drawable.defalut_img)
.transform(new GlideCircleTransform(mContext,2,mContext.getResources().getColor(R.color.white)))
.diskCacheStrategy(DiskCacheStrategy.SOURCE).into(imageview);

//不带白色边框的圆形图片加载
 Glide.with(mContext).load(path).centerCrop().placeholder(R.drawable.defalut_img)
.transform(new GlideCircleTransform(mContext))
.diskCacheStrategy(DiskCacheStrategy.SOURCE).into(imageview);

Glide的加载工具类

public class GlideUtils {

/**
 * 加载网络图片
 * @param mContext
 * @param path
 * @param imageview
 */
public static void LoadImage(Context mContext, String path,
                                 ImageView imageview) {
        Glide.with(mContext).load(path).centerCrop().placeholder(R.drawable.defalut_img)
                .diskCacheStrategy(DiskCacheStrategy.SOURCE).into(imageview);
    }

/**
 * 加载带尺寸的图片
 * @param mContext
 * @param path
 * @param Width
 * @param Height
 * @param imageview
 */
public static void LoadImageWithSize(Context mContext, String path,
int Width, int Height, ImageView imageview) {
        Glide.with(mContext).load(path).override(Width, Height)
                .diskCacheStrategy(DiskCacheStrategy.SOURCE).into(imageview);
    }

/**
 * 加载本地图片
 * @param mContext
 * @param path
 * @param imageview
 */
public static void LoadImageWithLocation(Context mContext, Integer path,
                                             ImageView imageview) {
        Glide.with(mContext).load(path).diskCacheStrategy(DiskCacheStrategy.SOURCE)
                .into(imageview);
    }

/**
 * 圆形加载
 *
 * @param mContext
 * @param path
 * @param imageview
 */
public static void LoadCircleImage(Context mContext, int path,
                                       ImageView imageview) {
        Glide.with(mContext).load(path).centerCrop().placeholder(R.drawable.defalut_img)
                .transform(new GlideCircleTransform(mContext,2,mContext.getResources().getColor(R.color.white)))
                .diskCacheStrategy(DiskCacheStrategy.SOURCE).into(imageview);

    }

static class GlideCircleTransform extends BitmapTransformation {

private Paint mBorderPaint;
private float mBorderWidth;

public GlideCircleTransform(Context context) {
super(context);
        }

public GlideCircleTransform(Context context, int borderWidth, int borderColor) {
super(context);
            mBorderWidth = Resources.getSystem().getDisplayMetrics().density * borderWidth;

            mBorderPaint = new Paint();
            mBorderPaint.setDither(true);
            mBorderPaint.setAntiAlias(true);
            mBorderPaint.setColor(borderColor);
            mBorderPaint.setStyle(Paint.Style.STROKE);
            mBorderPaint.setStrokeWidth(mBorderWidth);
        }


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

private Bitmap circleCrop(BitmapPool pool, Bitmap source) {
if (source == null) return null;

int size = (int) (Math.min(source.getWidth(), source.getHeight()) - (mBorderWidth / 2));
int x = (source.getWidth() - size) / 2;
int y = (source.getHeight() - size) / 2;
// TODO this could be acquired from the pool too
            Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
            Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
if (result == null) {
                result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
            }
            Canvas canvas = new Canvas(result);
            Paint paint = new Paint();
            paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
            paint.setAntiAlias(true);
float r = size / 2f;
            canvas.drawCircle(r, r, r, paint);
if (mBorderPaint != null) {
float borderRadius = r - mBorderWidth / 2;
                canvas.drawCircle(r, r, borderRadius, mBorderPaint);
            }
return result;
        }

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