How call a Android native class with implements from unity ?

Try putting a copy of the google-play-services.jar file into your Plugins/Android folder alongside your own code jar file. I haven't used it myself but from the documentation it sounds like this is what they expect you to do.

@GFOOT , Thanks for the reply. placed google-play-services.jar in Plugins/Android folder along with my code jar file.

the ClassFoundException error was gone.

Now i have to Call a method which is in my Eclipse project

 public void sharePhoto(final String textPath, final String imagePath)
     {
 
     }

From unity, am calling like

 if(GUI.Button (new Rect(150,150,100,50),"Click")){
             AndroidJavaClass testClass = new AndroidJavaClass("com.unity3d.player.TestProjectActivity");
             testClass.Call<AndroidJavaObject>("sharePhoto","hai Sir","http://stereo.gsfc.nasa.gov/beacon/latest_256/ahead_euvi_195_latest.jpg");        
         }

am getting an error like

can you help on this ? Thank you in Advance.

You should post a separate question really, but the answer is that your Java method doesn't return a value so when you call it you should not specify the generic argument. Just call it like this:

 testClass.Call("sharePhoto","hai Sir","http://stereo.gsfc.nasa.gov/beacon/latest_256/ahead_euvi_195_latest.jpg");