取回Gmail联系人Android应用程序

我想弄清楚如何在app中取Gmail Contacts。取回Gmail联系人Android应用程序

链接中的 https://developers.google.com/google-apps/contacts/v3/#updating_contacts

我得到以下规定的例外执行代码： -

但我正在逐渐Exception，它是Caused by: java.lang.NullPointerException com.google.gdata.client.http.HttpGDataRequest.isOAuthProxyErrorResponse

并使用上的示例代码

我收到异常，因为： -

03-07 17:05:21.601: E/AndroidRuntime(18754): java.lang.NoClassDefFoundError: Failed resolution of:                                   Loauth/signpost/commonshttp/CommonsHttpOAuthConsumer; 
03-07 17:05:21.601: E/AndroidRuntime(18754): at com.netcomps.oauth_example.RequestTokenActivity.onCreate(RequestTokenActivity.java:32) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.app.Activity.performCreate(Activity.java:5990) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.app.ActivityThread.access$800(ActivityThread.java:151) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.os.Handler.dispatchMessage(Handler.java:102) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.os.Looper.loop(Looper.java:135) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at android.app.ActivityThread.main(ActivityThread.java:5254) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at java.lang.reflect.Method.invoke(Native Method) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at java.lang.reflect.Method.invoke(Method.java:372) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
03-07 17:05:21.601: E/AndroidRuntime(18754): Caused by: java.lang.ClassNotFoundException: Didn't find class "oauth.signpost.commonshttp.CommonsHttpOAuthConsumer" on path: DexPathList[[zip file "/data/app/com.netcomps.oauth_example-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]] 
03-07 17:05:21.601: E/AndroidRuntime(18754): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 
03-07 17:05:21.601: E/AndroidRuntime(18754): at java.lang.ClassLoader.loadClass(ClassLoader.java:469) 
03-07 17:05:21.601: E/AndroidRuntime(18754): ... 14 more 
03-07 17:05:21.601: E/AndroidRuntime(18754): Suppressed: java.lang.ClassNotFoundException: oauth.signpost.commonshttp.CommonsHttpOAuthConsumer 
03-07 17:05:21.601: E/AndroidRuntime(18754):  at java.lang.Class.classForName(Native Method) 
03-07 17:05:21.601: E/AndroidRuntime(18754):  at java.lang.BootClassLoader.findClass(ClassLoader.java:781) 
03-07 17:05:21.601: E/AndroidRuntime(18754):  at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) 
03-07 17:05:21.601: E/AndroidRuntime(18754):  at java.lang.ClassLoader.loadClass(ClassLoader.java:504) 
03-07 17:05:21.601: E/AndroidRuntime(18754):  ... 15 more 
03-07 17:05:21.601: E/AndroidRuntime(18754): Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

能否请你帮我出。

任何帮助将深深appriciated。

来源

2016-03-07 Mamta Kaundal

可能重复http://stackoverflow.com/questions/34494261/android-accessing - 谷歌电子表格的意志出现-NullPointerException异常-后的 – abielita