如何正确使用AccessGrant连接到android socialauth提供商

我的android应用程序正在存储来自成功的Socialuth授权的android Socialuth AccessGrant对象。我将其保存在sqlite中，并尝试使用存储的AccessGrant对象来允许一个带有AsycTask的服务连接到提供商（facebook、googleplus等），而不向用户显示登录屏幕。 下面是服务的AsyncTask中的代码段

AccessGrant currentAccessGrant = new AccessGrant(cn.getKey(),cn.getSecret());

currentAccessGrant.setProviderId(cn.getProviderId());
currentAccessGrant.setAttributes(cn.getAttributes());

manager = new SocialAuthManager();

try {                        
  //manager.getSocialAuthConfig().load("C:\\Users\\Blair\\Documents\\GitHub\\App3\\app3\\src\\main\\assets\\oauth_consumer.properties");
  //manager.getSocialAuthConfig().load();
  manager.getSocialAuthConfig();

} catch(Exception e) {
  Log.e(DEBUG_TAG, "SocialAuthConfig.load Exception", e);
}

if (cn.getProviderId().equals("googleplus")) {
  Log.d(DEBUG_TAG, "Setting googleplus");
  //currentAdapter.addProvider(SocialAuthAdapter.Provider.GOOGLEPLUS, R.drawable.googleplus);

  try {
    //provider = AuthProviderFactory.getInstance(currentAccessGrant.getProviderId(), oauth_consumer.properties);
    //provider = AuthProviderFactory.getInstance(currentAccessGrant.getProviderId());
    //provider = AuthProviderFactory.getInstance("googleplus");

    provider = manager.connect(currentAccessGrant);

    //currentAdapter.getCurrentProvider().setAccessGrant(currentAccessGrant);

  } catch(Exception e) {
    Log.e(DEBUG_TAG, "Social AuthProviderFactory Exception",e);
  }
}

这段代码给了我一个“在类路径中找不到oauth_consumer.properties文件”错误…然后我将oauth_consumer.properties添加到build.gradle文件中

dependencies {
    compile 'com.android.support:appcompat-v7:+'
    compile files('libs/socialauth-android-3.0.jar')
    compile files('libs/socialauth-4.3.jar')
    compile files ('src/main/assets/oauth_consumer.properties')
}

现在，无论我尝试以何种方式使用AuthManager或AuthProviderFactory，这都只会产生一个NullPointerException

03-22 18:06:31.834  29178-29356/com.myapp.app3 E/DownloadFriendService$DownloaderTask﹕ SocialAuthConfig.load Exception
    java.lang.NullPointerException
            at com.myapp.app3.service.DownloadFriendService$DownloaderTask.doSomething(DownloadFriendService.java:127)
            at com.myapp.app3.service.DownloadFriendService$DownloaderTask.doInBackground(DownloadFriendService.java:87)
            at com.myapp.app3.service.DownloadFriendService$DownloaderTask.doInBackground(DownloadFriendService.java:77)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)
03-22 18:06:31.834  29178-29356/com.myapp.app3 D/DownloadFriendService$DownloaderTask﹕ Setting googleplus
03-22 18:06:31.834  29178-29356/com.myapp.app3 E/DownloadFriendService$DownloaderTask﹕ Social AuthProviderFactory Exception
    java.lang.NullPointerException
            at org.brickred.socialauth.SocialAuthManager.getProviderInstance(SocialAuthManager.java:317)
            at org.brickred.socialauth.SocialAuthManager.connect(SocialAuthManager.java:257)
            at com.myapp.app3.service.DownloadFriendService$DownloaderTask.doSomething(DownloadFriendService.java:163)
            at com.myapp.app3.service.DownloadFriendService$DownloaderTask.doInBackground(DownloadFriendService.java:87)
            at com.myapp.app3.service.DownloadFriendService$DownloaderTask.doInBackground(DownloadFriendService.java:77)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)

如果有安卓socialauth专家，你能告诉我：
-我在哪里错误地实现了这一点？
-我是否应该寻找另一种方法来实现这一目标？
-为什么在我尝试直接使用AuthManager或AuthProviderFactory时找不到oauth_consumer.properties文件，但在活动中使用AuthAdapter时却找到了它（根据socialauth andriod示例项目）

谢谢

解决了！ 这肯定是我的错

由于某些原因，找不到属性文件，因此以下是我为其他困在同一位置的人提供的解决方案：

启动命令

config = SocialAuthConfig.getDefault();

try {
    config.load("assets/oauth_consumer.properties");
} catch(Exception e) {
    Log.e(DEBUG_TAG, "SocialAuthConfig.load 1 Exception", e);
}


manager = new SocialAuthManager();

try {
    manager.setSocialAuthConfig(config);
} catch(Exception e) {
    Log.e(DEBUG_TAG, "SocialAuthManager.setSocialAuthConfig 1 Exception", e);
}

然后在异步任务中

                provider = manager.connect(currentAccessGrant);

                provider.registerPlugins();

                try {
                    contacts = provider.getContactList();
                } catch (Exception e) {
                    Log.e(DEBUG_TAG, "Possible expired token?/n", e);
                }