PostBlogPage.dart

import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_blog_app/HomePage.dart';
import 'package:flutter_blog_app/main.dart';
import 'package:image_picker/image_picker.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:firebase_analytics/firebase_analytics.dart';

final googleSignIn = new GoogleSignIn();
final analytics = new FirebaseAnalytics();
final auth = FirebaseAuth.instance;
final reference = FirebaseDatabase.instance.reference().child('Blogs');

Future<Null> _ensureLoggedIn() async {
  GoogleSignInAccount user = googleSignIn.currentUser;
  if (user == null) user = await googleSignIn.signInSilently();
  if (user == null) {
    user = await googleSignIn.signIn();
    analytics.logLogin();
  }
  if (await auth.currentUser() == null) {
    GoogleSignInAuthentication credentials =
        await googleSignIn.currentUser.authentication;
    await auth.signInWithGoogle(
      idToken: credentials.idToken,
      accessToken: credentials.accessToken,
    );
  }
}

class PostBlogPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      routes: <String, WidgetBuilder>{
        "/home": (BuildContext context) => new HomePage(),
      },
      home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Post Blog..'),
          ),
          body: new _PostPage()),
    );
  }
}

class _PostPage extends StatefulWidget {
  @override
  _PostPageState createState() => new _PostPageState();
}

class _PostPageState extends State<_PostPage> {
  File _image;
  final TextEditingController _title = new TextEditingController();
  final TextEditingController _desc = new TextEditingController();
  bool _isTitle = false;
  bool _isDesc = false;
  bool _isImage = false;
  bool _isLoading = false;

  Future getImage() async {
    var image = await ImagePicker.pickImage(source: ImageSource.gallery);

    setState(() {
      _image = image;
    });
  }

  @override
  Widget build(BuildContext context) {
    return new Container(
      child: new SingleChildScrollView(
        scrollDirection: Axis.vertical,
        reverse: true,
        child: new Container(
          child: new Column(
            children: <Widget>[
              new Padding(
                padding: const EdgeInsets.only(top: 24.0),
                child: _isLoading ? new CircularProgressIndicator() : null,
              ),
              new Padding(padding: const EdgeInsets.only(top: 24.0)),
              new InkWell(
                child: _image == null
                    ? new Image.asset(
                        'assets/img/img-placeholder.jpg',
                        height: 200.0,
                        width: 300.0,
                        fit: BoxFit.fill,
                      )
                    : new Image.file(
                        _image,
                        height: 200.0,
                        width: 300.0,
                      ),
                onTap: () {
                  getImage();
                  _isImage = true;
                },
              ),
              new Padding(
                padding: const EdgeInsets.all(20.0),
                child: new TextField(
                  controller: _title,
                  style: new TextStyle(
                    color: Colors.black,
                    fontSize: 18.0,
                  ),
                  onChanged: (String text) {
                    setState(() {
                      _isTitle = text.length > 0;
                    });
                  },
                  decoration: new InputDecoration.collapsed(
                    hintText: "Title",
                    border: new UnderlineInputBorder(
                      borderSide: const BorderSide(
                          color: Colors.blueAccent,
                          style: BorderStyle.solid,
                          width: 5.0),
                    ),
                  ),
                ),
              ),
              new Padding(
                padding: const EdgeInsets.all(20.0),
                child: new TextField(
                  controller: _desc,
                  style: new TextStyle(color: Colors.black, fontSize: 18.0),
                  onChanged: (String text) {
                    setState(() {
                      _isDesc = text.length > 0;
                    });
                  },
                  decoration: new InputDecoration.collapsed(
                    hintText: "Description",
                    border: new UnderlineInputBorder(
                      borderSide: const BorderSide(
                          color: Colors.blueAccent,
                          style: BorderStyle.solid,
                          width: 5.0),
                    ),
                  ),
                ),
              ),
              new Padding(
                padding: const EdgeInsets.all(8.0),
                child: new RaisedButton(
                  padding: const EdgeInsets.only(
                      left: 45.0, right: 45.0, top: 15.0, bottom: 15.0),
                  color: Colors.blueAccent,
                  elevation: 2.0,
                  child: new Text(
                    "Post",
                    style: new TextStyle(color: Colors.white),
                  ),
                  onPressed: _isTitle && _isDesc && _isImage && !_isLoading
                      ? () => _handleSubmitted(_title.text, _desc.text, _image)
                      : null,
                ),
              )
            ],
          ),
        ),
      ),
    );
  }

  Future<Null> _handleSubmitted(String title, String desc, File img) async {
    setState(() {
      _isLoading = true;
    });
    await _ensureLoggedIn();

    StorageReference ref = FirebaseStorage.instance.ref().child("Blog_Images/" +
        new DateTime.now().millisecondsSinceEpoch.toString()); //new
    StorageUploadTask uploadTask = ref.put(img); //new
    Uri downloadUrl = (await uploadTask.future).downloadUrl;
    _addBlog(title, desc, downloadUrl.toString());
  }

  void _addBlog(String title, String description, String imageUrl) {
//    print(googleSignIn.currentUser.displayName);
//    print(googleSignIn.currentUser.id);
//    print(title);
//    print(imageUrl);
//    print(description);
    reference.push().set({
      'IMAGE': imageUrl,
      'Title': title,
      'DESCRIPTION': description,
      'uid': googleSignIn.currentUser.id,
      'username': googleSignIn.currentUser.displayName
    });
//    Navigator.of(context).pushAndRemoveUntil(new MaterialPageRoute(builder: (Builder)))
//    Navigator.of(context).pushAndRemoveUntil(
//        new MaterialPageRoute(
//            builder: (BuildContext context) => new HomePage()),
//        (Route route) => route == null);
//    print("success");
    analytics.logEvent(name: 'post_blog');
    setState(() {
      _isLoading = false;
      _title.clear();
      _desc.clear();
      _isTitle = false;
      _isDesc = false;
      _isImage = false;
      _image = null;
    });
    Scaffold.of(context).showSnackBar(new SnackBar(
          content: new Text("Posted Successfully!"),
        ));
  }
}