post_add2.dart

import 'package:flutter/material.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:flutter_training/home.dart';
import 'dart:async';
import 'dart:io';
import 'package:image_picker/image_picker.dart';
import 'package:firebase_storage/firebase_storage.dart';

class PostAdd extends StatefulWidget {
  @override
  _PostAddState createState() => _PostAddState();
}

class _PostAddState extends State<PostAdd> {
  String postText;
  final textController = TextEditingController();
  File _imageFile;
  File _image;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Post Add'),
          actions: <Widget>[
            FlatButton(
              child: Text('Save'),
              textColor: Colors.white,
              onPressed: _postSave,
            ),
          ],
        ),
        body: ListView(
          padding: EdgeInsets.all(16.0),
          children: <Widget>[
            Container(
              child: Column(
                children: <Widget>[
                  TextField(
                    decoration: InputDecoration(
                      labelText: 'Write your post...',
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(5.0),
                      ),
                    ),
                    maxLength: 250,
                    maxLines: 6,
                    controller: textController,
                    //onSubmitted: (value) => postText = value,
                  ),
                  Row(
                    children: <Widget>[
                      IconButton(
                        icon: Icon(
                          Icons.camera_alt,
                          color: Colors.grey,
                        ),
                        onPressed: _openCamera,
                      ),
                      IconButton(
                        icon: Icon(
                          Icons.image,
                          color: Colors.grey,
                        ),
                        onPressed: _openGallery,
                      ),
                    ],
                  ),
                  _imageFile != null ? buildImage() : Text(''),
//                  Image.file(_imageFile),
                ],
              ),
            ),
          ],
        ));
  }

  Image buildImage() {
//    if (_imageFile != null) {
    return Image.file(_imageFile);
//    }
  }

  void _postSave() {
    StorageReference storageRef =
        FirebaseStorage.instance.ref().child('myimage.jpg');
    if (_image != null) {
      StorageUploadTask task = storageRef.putFile(_image);
//      if(task.isSuccessful) {
      var downloadUrl = storageRef.getDownloadURL();
      print('downloadUrl: ${downloadUrl.toString()}');
      var postRef = FirebaseDatabase.instance.reference().child('posts');
      try {
        postRef.push().set({
          'content': textController.text,
        });
      } catch (e) {
        print('Error: ${e}');
      }
      textController.clear();
      Navigator.pop(
        context,
        MaterialPageRoute(builder: (context) => HomePage()),
      );
//      } else {
//        print('task is not successful...');
//      }

    }
  }

  void _openCamera() async {
    print('open camera...');
    try {
      _imageFile = await ImagePicker.pickImage(source: ImageSource.camera);
      print('path: ${_imageFile}');
      setState(() {
        _image = _imageFile;
      });
    } catch (e) {
      print('Error: ${e}');
    }
  }

  void _openGallery() async {
    print('open gallery...');
    try {
      _imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
      print('path: ${_imageFile.path}');
      setState(() {
        _image = _imageFile;
      });
    } catch (e) {
      print('Error: ${e}');
    }
  }
}