I'm trying to write a plugin for Unity to access the getSimOperatorName() and getNetworkOperatorName() methods on Android. In Android Studio, AAR has created a library of two classes. Help is needed.

 package com.eppz.myplugin; import android.app.Activity; import android.content.Context; import android.telephony.TelephonyManager; public class My_Plugin extends Activity { static Context context = MyApplication.getContext(); static String test = ""; public static String getMessage() { TelephonyManager telephonyManager = ((TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE)); try { test = telephonyManager.getSimOperatorName(); }catch (Exception e){ test = e.getMessage(); } return test;} }

2 classes

 package com.eppz.myplugin; import android.app.Application; import android.content.Context; public class MyApplication extends Application { private static Context mContext; @Override public void onCreate() { super.onCreate(); mContext = getApplicationContext(); } public static Context getContext() { return mContext; }

Error log

05-08 05: 23: 26.245 30107-30152 /? I / Unity: AndroidJavaException: java.lang.NullPointerException: Attempt to invoke the virtual method 'java.lang.Object android.content.Context.getSystemService (java.lang.String)' on a null object reference java.lang. to invoke the virtual method java.lang.Object android.content.Context.getSystemService unity3d.player.UnityPlayer.nativeRender (Native Method) at com.unity3d.player.UnityPlayer.a (Unknown Source) at com.unity3d.player.UnityPlayer $ c $ 1.handleMessage (Unknown Source) at android.os.Handler.dispatchMessage (Handler.java:98) at android.os.Looper.loop (Looper.java:135) at com.unity3d.player.UnityPlayer $ c.run (Unknown Source) at UnityEngine.AndroidJNISafe.CheckException () [0x00000] in : 0 at UnityEngine. AndroidJNISafe. CallStaticStringMethod (IntPtr clazz, IntPtr methodID, UnityEngine.jvalue [] args) [0x00000] in: 0 at UnityEngine.Androi

  • 1. Make sure that Application is initialized with a static constructor (which I doubt), or rewrite your "static Context context = MyApplication.getContext ();" on initialization singleton. 2. judging by the exception, your Context.TELEPHONY_SERVICE, or your telephonyManager after all initializations, is equal to nullptr. - test123

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