Glide使用CircleImageView，显示图片出错的问题

前言

正文

前言

Glide通过CircleImageView来加载图片…………是个大坑，很多人估计都遇到过这种情况：当通过Glide来在CircleImageView上加载图片的时候，第一次显示的是占位图，刷新一次才是要加载的图片。现在写下这篇博客，记录下解决方法。

正文

public class GlideCircleImage extends BitmapTransformation {

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

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;

int size = Math.min(source.getWidth(), source.getHeight());
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);
return result;
}

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

相应的，用法：

GlideCircleImage circleImage = new GlideCircleImage(context);
Glide.with(context).load(xxx).transform(circleImage).placeholder(R.drawable.default_avatar).crossFade().into(avatar);