unity提供AndroidJavaClass（https://docs.unity3d.com/ScriptReference/AndroidJavaClass.html點選開啟連結）和AndroidJavaObject(https://docs.unity3d.com/ScriptReference/AndroidJavaObject.html點選開啟連結)類讓我們使用

1.unity呼叫java

(1)獲取JavaObject物件

#if UNITY_ANDROID && !UNITY_EDITOR
        private static AndroidJavaClass androidJavaClass =  null;
        private static AndroidJavaObject androidJavaObject = null;

        androidJavaClass=new AndroidJavaClass("com.example.MyClass");  //android包名類名
        androidJavaObject = androidJavaClass.GetStatic<AndroidJavaObject>("Instance");        
       #endif
 

#if UNITY_ANDROID && !UNITY_EDITOR
            if(androidJavaObject!=null)
            {
                androidJavaObject.Call("JavaMethod",strParam,intParam);
            }
            #endif 

打包成安卓工程需勾選此選項