AndroidJavaException: java.lang.NoSuchMethodError

[desouse]

[REQUIRED] Step 1: Describe your environment

• Unity version: 2020.3.19f1
• Google Mobile Ads Unity plugin version: 8.4.0
• Platform: Android
• Platform OS version: Android 11
• Any specific devices issue occurs on:
• Mediation ad networks used, and their versions:

[REQUIRED] Step 2: Describe the problem

Steps to reproduce:

I was trying to call the new method ApplicationPreferences.SetString("key", "value"), which was added in ApplicationPreferences API to manage GMA preferences. However, I get this exception:

AndroidJavaException: java.lang.NoSuchMethodError: no non-static method with name='getDefaultSharedPreferences' signature='()Ljava/lang/Object;' in class Ljava.lang.Object;
java.lang.NoSuchMethodError: no non-static method with name='getDefaultSharedPreferences' signature='()Ljava/lang/Object;' in class Ljava.lang.Object;
	at com.unity3d.player.ReflectionHelper.getMethodID(Unknown Source:162)
	at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
	at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0)
	at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:268)
	at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20)
at UnityEngine.AndroidJNISafe.CheckException () [0x00000] in <00000000000000000000000000000000>:0
at UnityEngine.AndroidJNISafe.CallStaticObjectMethod (System.IntPtr clazz, System.IntPtr methodID, UnityEngine.jvalue[] args) [0x00000] in <000000000000000000000000

Relevant Code:

The problem is in the way of getting the Java interface SharedPreferences.Editor.
So instead of this

AndroidJavaObject androidJavaObject = new AndroidJavaClass("android.preference.PreferenceManager").Call<AndroidJavaObject>("getDefaultSharedPreferences").Call<AndroidJavaObject>("edit");

it should be this

AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
AndroidJavaObject currentActivity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
AndroidJavaObject androidJavaObject = new AndroidJavaClass("android.preference.PreferenceManager").CallStatic<AndroidJavaObject>("getDefaultSharedPreferences", currentActivity).Call<AndroidJavaObject>("edit");

[NVentimiglia]

@desouse

I have confirmed the issue. We will get a fix out. b/290671721