disaster_add.dart

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

import 'package:bencana/home.dart';

class DisasterAdd extends StatefulWidget {
  @override
  _DisasterAddState createState() => _DisasterAddState();
}

class _DisasterAddState extends State<DisasterAdd> {
  String userId;
  String contentText;
  String titleText;
  var disasterId;
  final contentController = TextEditingController();
  final titleController = TextEditingController();
  final locationController = TextEditingController();
  File _imageFile;
  File _image;
  int timestamp;
  bool isLoading = false;

  // Image untuk preview
  Image buildImage() {
    return Image.file(
      _imageFile,
      width: MediaQuery.of(context).size.width,
      height: 240.0,
      fit: BoxFit.fitWidth,
    );
  }

  // Upload image ke Firebase Storage
  Future<String> uploadImage(var imageFile) async {
    timestamp = DateTime.now().millisecondsSinceEpoch;
    String fileName = timestamp.toString() + "jpg";
    StorageReference storageRef =
        FirebaseStorage.instance.ref().child('images').child(fileName);
    StorageUploadTask task = storageRef.putFile(_image);
    var _downloadUrl = await (await task.onComplete).ref.getDownloadURL();
    String _url = _downloadUrl.toString();
    print('Download URL: $_url');
    return _url;
  }

  // Simpan posting
  void _postSave() async {
    setState(() {
      isLoading = true;
    });

    await FirebaseAuth.instance.currentUser().then((user) {
      userId = user.uid;
    });
    if (_image != null) {
      print('Uploading image....');
      uploadImage(_image).then((_url) {
        if (_url != null) {
          print('Image upload is successful!');
          print('Image URL: $_url');
          var postRef =
              FirebaseDatabase.instance.reference().child('disasters');
          try {
            print('Saving post....');
            disasterId = postRef.push().key;
            postRef.child(disasterId).set({
              'disasterId': disasterId,
              'timestamp': timestamp,
              'title': titleController.text,
              'content': contentController.text,
              'location': locationController.text,
              'photo': _url.toString(),
              'userId': userId
            }).whenComplete(() {
              print('Saving complete!');
              titleController.clear();
              contentController.clear();
              Navigator.pop(
                context,
                MaterialPageRoute(builder: (context) => HomePage()),
              );
            });
          } catch (e) {
            setState(() {
              isLoading = false;
            });
            print('Error1: $e');
          }
        } else {
          setState(() {
            isLoading = false;
          });
          print('Upload is not successful!');
        }
      });
    } else {
      var postRef = FirebaseDatabase.instance.reference().child('disasters');
      try {
        postRef.push().set({
          'title': titleController.text,
          'content': contentController.text,
        }).whenComplete(() {
          titleController.clear();
          contentController.clear();
          Navigator.pop(
            context,
            MaterialPageRoute(builder: (context) => HomePage()),
          );
        });
      } catch (e) {
        setState(() {
          isLoading = false;
        });
        print('Error2: $e');
      }
    }
  }

  // Image picker untuk kamera
  void _openCamera() async {
    print('open camera...');
    try {
      _imageFile = await ImagePicker.pickImage(source: ImageSource.camera);
      print('path: $_imageFile');
      setState(() {
        _image = _imageFile;
      });
    } catch (e) {
      print('Error3: $e');
    }
  }

  // Image picker untuk gallery
  void _openGallery() async {
    print('open gallery...');
    try {
      _imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
      print('galery path: $_imageFile');
      setState(() {
        _image = _imageFile;
      });
    } catch (e) {
      print('Error4: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Disaster Add'),
          actions: <Widget>[
            IconButton(
              icon: Icon(Icons.save),
              color: Colors.white,
              onPressed: _postSave,
            )
          ],
        ),
        body: ListView(
          padding: EdgeInsets.all(16.0),
          children: <Widget>[
            Container(
              child: Column(
                children: <Widget>[
                  TextField(
                    decoration: InputDecoration(
                      labelText: 'Title',
                      alignLabelWithHint: true,
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(5.0),
                      ),
                    ),
                    maxLength: 50,
                    maxLines: 1,
                    controller: titleController,
                    textCapitalization: TextCapitalization.words,
//                    onSubmitted: (value) => titleText = value,
                  ),
                  TextField(
                    decoration: InputDecoration(
                      labelText: 'Content',
                      hintText: 'Write your post...',
                      alignLabelWithHint: true,
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(5.0),
                      ),
                    ),
                    maxLength: 500,
                    maxLines: 6,
                    controller: contentController,
                    textCapitalization: TextCapitalization.sentences,
//                    onSubmitted: (value) => contentText = value,
                  ),
                  TextField(
                    decoration: InputDecoration(
                      labelText: 'Location',
                      hintText: 'Location',
                      alignLabelWithHint: true,
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(5.0),
                      ),
                    ),
                    controller: locationController,
                    textCapitalization: TextCapitalization.words,
//                    onSubmitted: (value) => contentText = 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,
                      ),
                      Container(
                          height: 20,
                          width: 20,
                          child: isLoading == true
                              ? CircularProgressIndicator()
                              : Text('')),
                    ],
                  ),
                  _imageFile != null ? buildImage() : Text(''),
                ],
              ),
            ),
          ],
        ));
  }
}