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<key>CFBundleURLTypes</key>
    <array>
        <dict>
            <key>CFBundleTypeRole</key>
            <string>Editor</string>
            <key>CFBundleURLSchemes</key>
            <array>
                <string>[YOUR_REVERSED_CLIENT_ID]</string>
            </array>
        </dict>

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GoogleSignInAccount googleUser = await googleSignIn.signIn();
GoogleSignInAuthentication googleAuth = await googleUser.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(
    accessToken: googleAuth.accessToken,
    idToken: googleAuth.idToken,
);
FirebaseUser firebaseUser = (await firebaseAuth.signInWithCredential(credential)).user;

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if (firebaseUser != null) {
    // Check is already sign up
    final QuerySnapshot result =
        await Firestore.instance.collection('users').where('id', isEqualTo: firebaseUser.uid).getDocuments();
    final List < DocumentSnapshot > documents = result.documents;
    if (documents.length == 0) {
        // Update data to server if new user
        Firestore.instance.collection('users').document(firebaseUser.uid).setData(
            { 'nickname': firebaseUser.displayName, 'photoUrl': firebaseUser.photoUrl, 'id': firebaseUser.uid });
    }

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SharedPreferences prefs;
prefs = await SharedPreferences.getInstance();
id = prefs.getString('id') ?? '';
nickname = prefs.getString('nickname') ?? '';
aboutMe = prefs.getString('aboutMe') ?? '';
photoUrl = prefs.getString('photoUrl') ?? '';

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Future uploadFile() async {
    String fileName = id;
    StorageReference reference = FirebaseStorage.instance.ref().child(fileName);
    StorageUploadTask uploadTask = reference.putFile(avatarImageFile);
    StorageTaskSnapshot storageTaskSnapshot;
    uploadTask.onComplete.then((value) {
        if (value.error == null) {
            storageTaskSnapshot = value;
            storageTaskSnapshot.ref.getDownloadURL().then((downloadUrl) {
                photoUrl = downloadUrl;

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Container(
  child: StreamBuilder(
    stream: Firestore.instance.collection('users').limit(_limit).snapshots(),
    builder: (context, snapshot) {
      if (!snapshot.hasData) {
        return Center(
          child: CircularProgressIndicator(
			valueColor: AlwaysStoppedAnimation<Color>(themeColor),
          ),
        );

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Future < Null > handleSignOut() async {
    this.setState(() {
        isLoading = true;
    });

    await FirebaseAuth.instance.signOut();
    await googleSignIn.disconnect();
    await googleSignIn.signOut();

    this.setState(() {

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@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: Text(
        this.widget.arguments.peerNickname,
        style: TextStyle(color: ColorConstants.primaryColor),
      ),
      centerTitle: true,
    ),

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void _onBackPress() {
  _chatProvider.updateDataFirestore(
    FirestoreConstants.pathUserCollection,
    _currentUserId,
    {FirestoreConstants.chattingWith: null},
  );
  Navigator.pop(context);
}

void _getSticker() {

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StreamBuilder(
  stream: Firestore.instance
      .collection('messages')
      .document(groupChatId)
      .collection(groupChatId)
      .orderBy('timestamp', descending: true)
      .limit(_limit)
      .snapshots(),
  builder: (context, snapshot) {
    if (!snapshot.hasData) {