Question

我可以将图片上传到谷歌存储，现在我正在尝试下载此文件，但我有一个nullPointerException

            try {
                List<String> scopes = new ArrayList<String>();
                scopes.add(StorageScopes.DEVSTORAGE_FULL_CONTROL);
                httpTransport = new com.google.api.client.http.javanet.NetHttpTransport();

                // agarro la key y la convierto en un file
                AssetManager am = mContext.getAssets();
                InputStream inputStream = am.open(mContext.getResources().getString(R.string.storage_p12_key_path)); // you
                File file = stream2file(inputStream);

                // Google Credentianls
                GoogleCredential credential = new GoogleCredential.Builder().setTransport(httpTransport).setJsonFactory(jsonFactory)
                        .setServiceAccountId(mContext.getResources().getString(R.string.storage_mail_id))
                        .setServiceAccountScopes((scopes)).setServiceAccountPrivateKeyFromP12File(file).build();
                String URI = null;
                HttpRequestFactory requestFactory = httpTransport.createRequestFactory(credential);


                GenericUrl url = new GenericUrl(URI);
                HttpRequest getRequest;
                getRequest = requestFactory.buildGetRequest(url);

                com.google.api.client.http.HttpResponse response =     getRequest.execute();
                String content = response.parseAsString();
                Log.d("debug", "response is:" + response.getStatusCode());
                Log.d("debug", "response content is:" + content);

            } catch (IOException e) {
                e.printStackTrace();
            } catch (GeneralSecurityException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }

在此行getRequest.execute（）;我得到nullPointer异常

任何帮助将不胜感激

Answer 1

没有查看堆栈跟踪，我无法确定，但我认为这是因为URI为空。这一点：

String URI = null;
GenericUrl url = new GenericUrl(URI); //url is to a null URI
HttpRequest getRequest = requestFactory.buildGetRequest(url); //getRequest for a null URL
getRequest.execute() // call to a null URI.

谷歌云存储中的Android下载文件

1 个答案: