小编mio*_*kon的帖子

为什么位图返回onNewResultImplnull？

final ImageView imageView = (ImageView) findViewById (R.id.imageView);

ImageRequest request = ImageRequest.fromUri(pic_uri);

ImagePipeline imagePipeline = Fresco.getImagePipeline();
DataSource dataSource = imagePipeline.fetchEncodedImage(request, this);
CloseableReference<CloseableImage> imageReference = null;
dataSource.subscribe (new BaseBitmapDataSubscriber() {
    @Override
    protected void onNewResultImpl(Bitmap bitmap) {
        LogUtils._d("onNewResultImpl....");
        if(bitmap == null) {
            LogUtils._d("bitmap is null");
        }
        imageView.setImageBitmap(bitmap);
    }

    @Override
    protected void onFailureImpl(DataSource dataSource) {
        LogUtils._d("onFailureImpl....");
    }
}, CallerThreadExecutor.getInstance());

我有网络要求:

userApi.getUserInfoByUid (AuthUtils.getUid (ctx), AuthUtils.getToken (ctx))
            .doOnNext (u -> saveToCache (u))
            .observeOn (AndroidSchedulers.mainThread ())
            .subscribe (u -> {
                if (updateListener != null)
                    updateListener.onUpdate (u);
            },e->{
                Toast.makeText (ctx,"network error",Toast.LENGTH_SHORT).show ();
            });

你知道,许多请求可能有网络错误,所以我提取OnError()方法.如:

 abstract class Mysubscrib<T> extends Subscriber<T>{

    @Override
    public void onCompleted() {
        //do nothing
    }

    @Override
    public void onError(Throwable e) {
        Toast.makeText (ctx,"network error",Toast.LENGTH_SHORT).show ();
    }
}

    userApi.getUserInfoByUid (AuthUtils.getUid (ctx), AuthUtils.getToken (ctx))
            .doOnNext (u -> saveToCache (u))
            .observeOn (AndroidSchedulers.mainThread ())
            .subscribe (new Mysubscrib<UserInfo> () {
                @Override
                public void onNext(UserInfo userInfo) { …