在unity中获取android上的所有gmail帐户

using UnityEngine;
using System.Collections.Generic;
using System.Linq;

public List<string> GetAllGmailAccounts()
{
    List<string> gmailAccounts = new List<string>();

    AndroidJavaObject accountManager = new AndroidJavaObject("android.accounts.AccountManager");
    AndroidJavaObject context = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic<AndroidJavaObject>("currentActivity");

    AndroidJavaObject accounts = accountManager.Call<AndroidJavaObject>("get", context).Call<AndroidJavaObject>("getAccountsByType", "com.google");

    int count = accounts.Call<int>("length");
    for (int i = 0; i < count; i++)
    {
        string accountName = accounts.Call<AndroidJavaObject>("get", i).Get<string>("name");
        gmailAccounts.Add(accountName);
    }

    return gmailAccounts;
}

List<string> gmailAccounts = GetAllGmailAccounts();
foreach (string account in gmailAccounts)
{
    Debug.Log("Gmail Account: " + account);
}