Question

我正在尝试使用Azure Blob Storage for Android应用程序，方法如下： http://azure.microsoft.com/en-in/documentation/articles/storage-java-how-to-use-blob-storage/

我正在使用Android Studio

我没事，直到我在行中得到例外：

container.createIfNotExists();

此行显示错误：

Attempt to invoke interface method 'void com.android.okhttp.internal.http.Transport.writeRequestHeaders(com.android.okhttp.Request)' on a null object reference

以下是我的导入：

import com.microsoft.azure.storage.*;
import com.microsoft.azure.storage.blob.*;

java代码：

try{
            System.out.print("Code Progess 2 ");
            CloudStorageAccount account = CloudStorageAccount.parse(storageConnectionString);
            System.out.print("Code Progess 3 ");
            CloudBlobClient serviceClient = account.createCloudBlobClient();
            System.out.print("Code Progess 4 ");

            // Container name must be lower case.
            CloudBlobContainer container = serviceClient.getContainerReference("myimages");
            System.out.print("Code Progess 5 ");
            container.createIfNotExists();
            System.out.print("Code Progess 6 ");

            // Upload an image file.
            CloudBlockBlob blob = container.getBlockBlobReference("image1.jpg");
            System.out.print("Code Progess 7 ");
            File sourceFile = new File("<Path to local image storage>");
            System.out.print("Code Progess 8 ");
            blob.upload(new FileInputStream(sourceFile), sourceFile.length());
            System.out.print("Code Progess 9 ");

            // Download the image file.
            File destinationFile = new File(sourceFile.getParentFile(), "image1Download.tmp");
            System.out.print("Code Progess 10 ");
            blob.downloadToFile(destinationFile.getAbsolutePath());
            System.out.print("Code Progess 11 ");
        }

catch (Exception e) {
            System.out.print("Exception encountered: ");
            System.out.println(e.getMessage());
            System.exit(-1);
        }

logcat如下：

01-09 20:54:02.072    2271-2287/com.rollcall.blob W/art﹕ Verification of void com.microsoft.azure.storage.blob.CloudBlobContainer.create(com.microsoft.azure.storage.blob.BlobRequestOptions, com.microsoft.azure.storage.OperationContext) took 334.218ms
01-09 20:54:02.140    2271-2287/com.rollcall.blob W/art﹕ Unresolved exception class when finding catch block: javax.xml.stream.XMLStreamException
01-09 20:54:02.141    2271-2287/com.rollcall.blob I/System.out﹕ Code Progess 1 Code Progess 2 Code Progess 3 Code Progess 4 Code Progess 5 Exception encountered: Attempt to invoke interface method 'void com.android.okhttp.internal.http.Transport.writeRequestHeaders(com.android.okhttp.Request)' on a null object reference

谁能告诉我哪里出错了？

由于

Answer 1

您参考的入门指南专门针对Java。您是否在为样本使用Java或Android Azure存储客户端库？您应该使用单独的Android Azure存储客户端库来构建Android应用程序。

您可以查看Github存储库上的readme document以开始使用。使用blob的示例代码也可以在存储库here

中找到

container.createIfNotExists（）;上的空对象引用错误;

1 个答案: