tsacdop-podcast-app-android/lib/podcasts/podcastlist.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:flutter_html/flutter_html.dart';
import 'package:path_provider/path_provider.dart';
import 'package:provider/provider.dart';

import 'package:tsacdop/class/podcastlocal.dart';
import 'package:tsacdop/class/settingstate.dart';
import 'package:tsacdop/local_storage/sqflite_localpodcast.dart';
import 'package:tsacdop/podcasts/podcastdetail.dart';
import 'package:tsacdop/util/pageroute.dart';

class AboutPodcast extends StatefulWidget {
  final PodcastLocal podcastLocal;
  AboutPodcast({this.podcastLocal, Key key}) : super(key: key);

  @override
  _AboutPodcastState createState() => _AboutPodcastState();
}

class _AboutPodcastState extends State<AboutPodcast> {
  void _unSubscribe(String t) async {
    var dbHelper = DBHelper();
    dbHelper.delPodcastLocal(t);
    print('Unsubscribe');
  }

  String _description;
  bool _load;

  void getDescription(String title) async {
    var dbHelper = DBHelper();
    String description = await dbHelper.getFeedDescription(title);
    _description = description;
    setState(() {
      _load = true;
    });
  }

  @override
  void initState() {
    super.initState();
    _load = false;
    getDescription(widget.podcastLocal.title);
  }

  @override
  Widget build(BuildContext context) {
    var _settingState = Provider.of<SettingState>(context);
    return AlertDialog(
      actions: <Widget>[
        FlatButton(
          padding: EdgeInsets.all(10.0),
          onPressed: () {
            _unSubscribe(widget.podcastLocal.title);
            _settingState.subscribeUpdate = Update.justupdate;
            Navigator.of(context).pop();
          },
          color: Colors.grey[200],
          textColor: Colors.red,
          child: Text(
            'UNSUBSCRIBE',
          ),
        ),
      ],
      title: Text(widget.podcastLocal.title),
      content: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          !_load
              ? Center()
              : _description != null ? Html(data: _description) : Center(),
          (widget.podcastLocal.author != null)
              ? Text(widget.podcastLocal.author,
                  style: TextStyle(color: Colors.blue))
              : Center(),
        ],
      ),
    );
  }
}

class PodcastList extends StatefulWidget {
  @override
  _PodcastListState createState() => _PodcastListState();
}

class _PodcastListState extends State<PodcastList> {
  var dir;

  Future<List<PodcastLocal>> getPodcastLocal() async {
    dir = await getApplicationDocumentsDirectory();
    var dbHelper = DBHelper();
    var podcastList = await dbHelper.getPodcastLocalAll();
    return podcastList;
  }

  @override
  Widget build(BuildContext context) {
    double _width = MediaQuery.of(context).size.width;
    return Scaffold(
      appBar: AppBar(
        title: Text('Podcasts'),
        centerTitle: true,
        backgroundColor: Colors.grey[100],
        elevation: 0,
      ),
      body: Container(
        color: Colors.grey[100],
        child: FutureBuilder<List<PodcastLocal>>(
          future: getPodcastLocal(),
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              return CustomScrollView(
                primary: false,
                slivers: <Widget>[
                  SliverPadding(
                    padding: const EdgeInsets.all(10.0),
                    sliver: SliverGrid(
                      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                        childAspectRatio: 0.8,
                        crossAxisCount: 3,
                      ),
                      delegate: SliverChildBuilderDelegate(
                        (BuildContext context, int index) {
                          return InkWell(
                            onTap: () {
                              Navigator.push(
                                context,
                                ScaleRoute(
                                    page: PodcastDetail(
                                  podcastLocal: snapshot.data[index],
                                )),
                              );
                            },
                            onLongPress: () {
                              showDialog(
                                context: context,
                                builder: (BuildContext context) => AboutPodcast(
                                    podcastLocal: snapshot.data[index]),
                              ).then((_) => setState(() {}));
                            },
                            child: Container(
                              alignment: Alignment.center,
                              child: Column(
                                mainAxisAlignment: MainAxisAlignment.start,
                                children: <Widget>[
                                  Container(
                                    height: 10.0,
                                  ),
                                  ClipRRect(
                                    borderRadius: BorderRadius.all(
                                        Radius.circular(_width / 8)),
                                    child: Container(
                                      height: _width / 4,
                                      width: _width / 4,
                                      child: Image.file(File(
                                          "${dir.path}/${snapshot.data[index].title}.png")),
                                    ),
                                  ),
                                  Container(
                                    padding: EdgeInsets.all(4.0),
                                    child: Text(
                                      snapshot.data[index].title,
                                      textAlign: TextAlign.center,
                                      style: TextStyle(
                                        fontSize: 16.0,
                                        color: Colors.black.withOpacity(0.5),
                                      ),
                                      maxLines: 2,
                                    ),
                                  ),
                                ],
                              ),
                            ),
                          );
                        },
                        childCount: snapshot.data.length,
                      ),
                    ),
                  ),
                ],
              );
            }
            return Text('NoData');
          },
        ),
      ),
    );
  }
}

class Podcast extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.grey[100],
        elevation: 0,
        centerTitle: true,
        title: Text('Podcasts'),
      ),
      body: Container(child: PodcastList()),
    );
  }
}