unityPlayer = new AndroidJavaClass("com.xxx.xxx.MainActivity");

            curActivity = unityPlayer.GetStatic<AndroidJavaObject>("m_PayProxy");// MainActivity 类的字段

            curActivity.Call("setGameObject", gameObject.name);

AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");

AndroidJavaObject activity = jc.GetStatic<AndroidJavaObject>("currentActivity");  // MainActivty

activity.Call("func") 

AndroidJavaClass ssdk = new AndroidJavaClass("cn.sharesdk.unity3d.ShareSDKUtils");// Java Class

ssdk.CallStatic("setGameObject", gameObject); // 静态函数

ssdk.CallStatic<bool>("isValid", platform);  // 有返回值的函数

// 1.Unity3d GameObject  2.GameObject 绑定的脚本函数 3.参数

UnityPlayer.UnitySendMessage(m_GameObject,"Message","onBuyProp.....");