java.lang.NoClassDefFoundError：com.google.api.services.drive.Drive

尝试使用任何 Drive 类函数时：

Drive service = new Drive.Builder(AndroidHttp.newCompatibleTransport(),new GsonFactory(), credential).build();

我已将正确的 jar 包含在 libs 文件夹中：

google-api-services-drive-v2-rev123-1.18.0-rc.jar

并且进口很好：

导入 com.google.api.services.drive.Drive；进口 com.google.api.services.drive.DriveScopes；

但它不断显示错误：

05-07 11:54:37.865: E/AndroidRuntime(25824): FATAL EXCEPTION: AsyncTask #1
05-07 11:54:37.865: E/AndroidRuntime(25824): java.lang.RuntimeException: An error occured while executing doInBackground()
05-07 11:54:37.865: E/AndroidRuntime(25824):    at android.os.AsyncTask$3.done(AsyncTask.java:299)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at java.lang.Thread.run(Thread.java:838)
05-07 11:54:37.865: E/AndroidRuntime(25824): Caused by: java.lang.NoClassDefFoundError: com.google.api.services.drive.Drive$Builder
05-07 11:54:37.865: E/AndroidRuntime(25824):    at com.example.googledrivetest.MainActivity$getAccountDetails.doInBackground(MainActivity.java:138)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at com.example.googledrivetest.MainActivity$getAccountDetails.doInBackground(MainActivity.java:1)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
05-07 11:54:37.865: E/AndroidRuntime(25824):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
05-07 11:54:37.865: E/AndroidRuntime(25824):    ... 5 more

我相信你还没有包括在内google-api-client-1.18.0-rc.jar库，这就是您收到异常的原因。

下载并解压后驱动API库 https://developers.google.com/resources/api-libraries/download/drive/v2/java，请阅读drive/readme.html。它列出了依赖 jarsgoogle-api-services-drive-v2-rev123-1.18.0-rc.jar需要包括在内。依赖的 jar 可以位于drive/libs文件夹。

以下是 Android 应用程序需要包含的完整 jar 集：

• google-api-services-drive-v2-rev123-1.18.0-rc.jar
• google-api-client-1.18.0-rc.jar
• 谷歌-oauth-client-1.18.0-rc.jar
• 谷歌-http-client-1.18.0-rc.jar
• jsr305-1.3.9.jar
• 谷歌-http-client-gson-1.18.0-rc.jar
• 谷歌-api-客户端-android-1.18.0-rc.jar
• 谷歌-http-client-android-1.18.0-rc.jar