Picasso获取得到的Bitmap

Picasso.with(this)
.load(imageUrl)
.resize(50, 50)
.centerCrop()
.into(new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
mPortrait.setImageBitmap(bitmap);
showBackground(bitmap);
}

                    @Override
                    public void onBitmapFailed(Drawable errorDrawable) {
                        mPortrait.setImageResource(R.drawable.img_portrait_default);
                    }

                    @Override
                    public void onPrepareLoad(Drawable placeHolderDrawable) {

                    }
                });