Google Platform for Android - NoClassDefFoundError: com.google.android.gms.samples.plus.SignInActivity

Question

I want to run a google +: PlusSampleActivity sample.

The steps for this are defined here: https://developers.google.com/+/mobile/android/getting-started

• Download Google Play services for my eclipse;
• In the Google APIs console, create an API project

• In the Services panel, enable the Google+ API

  • In the Access API panel, create an OAuth 2.0 client identifier
  • set product name
  • select android
  • install packagename as: com.google.android.gms.samples.plus
  • generate a signature certificate fingerprint using keytool
  • Create customer id

• Import the sample as described on page

The project has no compile-time errors.

But if I run the application, I get an exception:

FATAL EXCEPTION: main java.lang.ExceptionInInitializerError at java.lang.Class.newInstanceImpl(Native Method) at java.lang.Class.newInstance(Class.java:1409) at android.app.Instrumentation.newActivity(Instrumentation.java:1021) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675) at android.app.ActivityThread.access$1500(ActivityThread.java:121) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:130) at android.app.ActivityThread.main(ActivityThread.java:3701) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NoClassDefFoundError: 

I don’t know what is wrong when I tried to run a simpler application. Step 3 Initialize PlusClient, a similar exception:

 Caused by: java.lang.NoClassDefFoundError: com.example.ExampleActivity... 

Of course, I added access to the application by adding a new client identifier.

Link added to library correctly

I solved my problem:

Right-click the project, select Android Tools → Add Support Library

A source on how to do this.

Answer 1

Try running Project → Clean to fix the problem. It seemed to work for one person.

The library refers automatically to the project, but perhaps Eclipse forgets this and needs to be reminded.

Answer 2

The correct answer, as indicated by user 1861240, is this: Right-click on your project, select "Android Tools"> "Add Support Library" ...

This seems to be installing the latest support library for you.

Answer 3

I have the same error, but support library support has been added for me. I also tried Project-> Clean and restarted Eclipse. This ultimately worked after I changed the target API to 4.4.

Answer 4

Just follow the directions here. Keep in mind to keep track of the project, and not to ignore any step.