AndroidApplication.currentActivity

Description

Indicates the Java instance of the current activity.

Notes:

• This object is managed by Unity runtime, so do not call AndroidJavaObject.Dispose on it.
• If the application is a service rather than an activity, this property returns null.

Additional resources: AndroidApplication.currentContext.

using UnityEngine;
using UnityEngine.Android;

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