GCM : java.lang.noclassdeffounderror: com.google.android.gcm.GCMRegistrar

Question

I am trying to register a device onto GCM using the following code:

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    GCMRegistrar.checkDevice(this);
    // the following function can be removed when deploying the app
    GCMRegistrar.checkManifest(this);

    final String regId = GCMRegistrar.getRegistrationId(this);
    if (regId.equals("")) {
      GCMRegistrar.register(this, SENDER_ID);
    } else {
      Log.v(TAG, "Already registered");
    } 

I have imported import com.google.android.gcm.GCMRegistrar;
and also added GCM.jar to my buildpath in Eclipse which i got thru the sdk download

Please help !

Answer 1

In the updated ADT(Above ADT 17) you have to put jar files inside libs folder and not lib. So make sure that you put gcm.jar file inside libs and not lib folder.

Answer 2

Just go to project properties -> java build path -> "order and export " now giv a tick on the jar file "GCM.jar" that you have added

Answer 3

My gcm.jar was already in libs, so it wasn't a folder naming issue for me..

I had to go to Right Click > Build Path > Configure Build path... for the project in question and I removed the following:

• Any lingering files outside of a folder/bundle
• Android Private Libraries
• Any bundles with the word 'reference' in them (you may not have one)

You might get a lot of "errors" in your project so restart Eclipse and let it clean. Once it cleans you'll have no errors. Run your project and viola.

Thanks to DLew for this answer.

Answer 4

Make a folder libs in your project folder and put the gcm.jar in it. Then add it to your class path using add external jars in configure build path option.