Unity android is package installed

util.cs

bool IsPackageInstalled(string packageName)
{
#if UNITY_ANDROID
	var pluginClass = new AndroidJavaClass("android.content.pm.PackageManager");
	var jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
	var currentActivity = jc.GetStatic<AndroidJavaObject>("currentActivity");
	var packageManager = currentActivity.Call<AndroidJavaObject>("getPackageManager");
	
	int flag = pluginClass.GetStatic<int>("GET_META_DATA");
	var packages = packageManager.Call<AndroidJavaObject>("getInstalledApplications", flag);
	int count = packages.Call<int>("size");

	for (int i = 0; i < count; i++) {
		var pkg = packages.Call<AndroidJavaObject>("get", i);
		var pkgName = pkg.Get<string>("packageName");

		if (pkgName == packageName) {
			return true;
		}
	}
#endif

	return false;
}