AndroidApplication.currentContext

Description

Indicates the Java instance of the current context.

For more information, refer to the Android developer documentation on Context.

Note: This object is managed by Unity runtime, so do not call AndroidJavaObject.Dispose on it.

using UnityEngine;
using UnityEngine.Android;

public class Controller : MonoBehaviour
{
    void Start()
    {
        var isRunningGameActivity = AndroidApplication.currentContext.Call<string>("getLocalClassName").Equals("com.unity3d.player.UnityPlayerGameActivity");
        var isRunningActivity = AndroidApplication.currentContext.Call<string>("getLocalClassName").Equals("com.unity3d.player.UnityPlayerActivity");
        Debug.Log($"GameActivity {isRunningGameActivity}");
        Debug.Log($"Activity {isRunningActivity}");
    }
}