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I am trying to figure out how to fetch Gmail Contacts in my app.

On implementing the code in the link https://developers.google.com/google-apps/contacts/v3/#updating_contacts

I am getting the exception specified below:-

But i am getting Exception that is Caused by: java.lang.NullPointerException com.google.gdata.client.http.HttpGDataRequest.isOAuthProxyErrorResponse

And using the example code on http://androidwarzone.blogspot.in/2011/07/android-oauth-full-example-with-source.html

I am getting the exception as :- 

 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

Could you please help me out.

Any help will deeply appriciated.

Mamta Kaundal
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  • possible duplicate of http://stackoverflow.com/questions/34494261/android-accessing-google-spreadsheet-will-show-nullpointerexception-after-the – abielita Mar 08 '16 at 06:11

1 Answers1

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Finally, i got the solution to fetch the Google/Gmail contacts.The following link is very suitable answer to my question.

https://tush.wordpress.com/2014/07/15/android-google-contact-api-3-0-example/

This helps me a lot.

Updated Answer:

As Google is blocking the oAuth from webView so this link help you to fetch gmail contacts https://codelabs.developers.google.com/codelabs/appauth-android-codelab/#2

Mamta Kaundal
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