如何等待用户在“活动”中提供或拒绝权限请求？

如何解决如何等待用户在“活动”中提供或拒绝权限请求？

我希望我的代码等待，直到用户单击权限请求弹出窗口中的某些内容，然后继续。

我在RequestActivity中有此选项，但是在应用加载之前，我需要请求结果。

    protected override void OnResume()
    {
        base.OnResume();

        Task startupWork = new Task(async () => { await GetPermissions(); });
        startupWork.Start();

        StartActivity(new Intent(Application.Context,typeof(MainActivity)));
    }

    public static async Task GetPermissions()
    {
        var permissionsstartList = new List<Permission>()
        {
            Permission.Storage,Permission.Camera
        };

        var permissionsNeededList = new List<Permission>();
        try
        {
            foreach (var permission in permissionsstartList)
            {
                var status = await Plugin.Permissions.Crosspermissions.Current.CheckPermissionStatusAsync(permission);
                if (status != PermissionStatus.Granted)
                {
                    permissionsNeededList.Add(permission);
                }
            }
        }
        catch (System.Exception)
        {
        }

        var results = await Plugin.Permissions.Crosspermissions.Current.RequestPermissionsAsync(permissionsNeededList.ToArray());

        try
        {
            foreach (var permission in permissionsNeededList)
            {
                var status = PermissionStatus.Denied;
                //Best practice to always check that the key exists
                if (results.ContainsKey(permission))
                    status = results[permission];
            }
        }
        catch (System.Exception)
        {
        }
    }

解决方法

尝试这样的事情

protected override void OnResume()
    {
        base.OnResume();

        if (await GetPermissions())
           StartActivity(new Intent(Application.Context,typeof(MainActivity)));
    }

仅是建议，请勿从OnResume()导航。从其他路径尝试，即类构造函数。

导入

使用System.Threading.Tasks;

public bool GetPermissions()
   {
      bool result;
      // EVERYTHING SAME AS YOUR CODE
        try
        {
            foreach (var permission in permissionsNeededList)
            {
                var status = PermissionStatus.Denied;
                //Best practice to always check that the key exists
                if (results.ContainsKey(permission))
                    status = results[permission];

                //If all permissions are set
                result = true;
            }
        }
        catch (System.Exception)
        {
            result = false;
        }
    return result;
    }

只需简单一点，而无需返回任务。

让我知道这是您真正想要的还是其他东西。

,

我找到了解决方法：

OnCreate函数：

List<string> permissionNeededList = new List<string>();

if (ActivityCompat.CheckSelfPermission(Android.App.Application.Context,Manifest.Permission.Camera) != (int)Permission.Granted)
{
   permissionNeededList.Add(Manifest.Permission.Camera);
}
if (ActivityCompat.CheckSelfPermission(Android.App.Application.Context,Manifest.Permission.WriteExternalStorage) != (int)Permission.Granted)
{
   permissionNeededList.Add(Manifest.Permission.WriteExternalStorage);
}

if (permissionNeededList.Count == 0)
{
   LoadApplication(new App());
}
else
{
   ActivityCompat.RequestPermissions(this,permissionNeededList.ToArray(),1);
}

OnRequestPermissionsResult函数：

public override void OnRequestPermissionsResult(int requestCode,string[] permissions,Permission[] grantResults)
{
   LoadApplication(new App());
}