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我正在開發一個聊天應用程序,並發現了一些關於如何將Firebase實施到Xamarin中的示例。我想我所做的一切,就像在教程,但我收到此錯誤:Xamarin,Android,Firebase:「Defualt FirebaseApp未初始化錯誤」...?
Java.Lang.IllegalStateException: Default FirebaseApp is not initialized in this process XamarinChatApp.XamarinChatApp. Make sure to call FirebaseApp.initializeApp(Context) first.
因此,所有後來我改變是錯誤發生之前添加此行代碼:
Firebase.FirebaseApp.InitializeApp(this);
但是,這並沒有改變任何東西。
這是完整的主要活動:
public class MainActivity : AppCompatActivity,IValueEventListener
{
private FirebaseClient firebase;
private List<MessageContent> lstMessage = new List<MessageContent>();
private ListView lstChat;
private EditText edtChat;
private FloatingActionButton fab;
public int MyResultCode = 1;
protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
}
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView (Resource.Layout.Main);
firebase = new FirebaseClient(GetString(Resource.String.firebase_database_url));
Firebase.FirebaseApp.InitializeApp(this);
FirebaseDatabase.Instance.GetReference("chats").AddValueEventListener(this);
fab = FindViewById<FloatingActionButton>(Resource.Id.fab);
edtChat = FindViewById<EditText>(Resource.Id.input);
lstChat = FindViewById<ListView>(Resource.Id.list_of_messages);
fab.Click += delegate
{
PostMessage();
};
if (FirebaseAuth.Instance.CurrentUser == null)
StartActivityForResult(new Android.Content.Intent(this, typeof(SignIn)), MyResultCode);
else
{
Toast.MakeText(this, "Welcome " + FirebaseAuth.Instance.CurrentUser.Email, ToastLength.Short).Show();
DisplayChatMessage();
}
}
private async void PostMessage()
{
var items = await firebase.Child("chats").PostAsync(new MessageContent(FirebaseAuth.Instance.CurrentUser.Email, edtChat.Text));
edtChat.Text = "";
}
public void OnCancelled(DatabaseError error)
{
}
public void OnDataChange(DataSnapshot snapshot)
{
DisplayChatMessage();
}
private async void DisplayChatMessage()
{
lstMessage.Clear();
var items = await firebase.Child("chats")
.OnceAsync<MessageContent>();
foreach (var item in items)
lstMessage.Add(item.Object);
ListViewAdapter adapter = new ListViewAdapter(this, lstMessage);
lstChat.Adapter = adapter;
}
}
}
的問題發生在OnCreate中,就在:
FirebaseDatabase.Instance.GetReference("chats").AddValueEventListener(this);
我發現另一個解決這個在這個論壇上,但他們所做的一切是添加上面的行,它的工作。對我來說,不幸的是沒有。
任何幫助將是真棒:) THANKS