This class (or a class which this class inherits from) is marked as '@immutable', but one or more of its instance fields are not final: MusicHome.songs.
Same message is showing in most pages
The error is pointing in this line of code which is MusicHome: class MusicHome extends StatefulWidget {
Here is the full code
`import 'dart:async';
import 'package:flute_music_player/flute_music_player.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:musicplayer/database/database_client.dart';
import 'package:musicplayer/pages/now_playing.dart';
import 'package:musicplayer/pages/settings.dart';
import 'package:musicplayer/util/lastplay.dart';
import 'package:musicplayer/views/album.dart';
import 'package:musicplayer/views/artists.dart';
import 'package:musicplayer/views/home.dart';
import 'package:musicplayer/views/playlists.dart';
import 'package:musicplayer/views/songs.dart';
import 'package:shared_preferences/shared_preferences.dart';
class MusicHome extends StatefulWidget {
List songs;
MusicHome();
final bottomItems = [
new BottomItem("Home", Icons.home),
new BottomItem("Albums", Icons.album),
new BottomItem("Songs", Icons.music_note),
new BottomItem("Artists", Icons.person),
new BottomItem("PlayList", Icons.playlist_add_check),
];
@override
State createState() {
return new _Musicstate();
}
}
class _Musicstate extends State {
int _selectedDrawerIndex = 0;
List songs;
String title = "Music player";
DatabaseClient db;
bool isLoading = true;
Song last;
Color color = Colors.deepPurple;
var themeLoading = true;
getDrawerItemWidget(int pos) {
switch (pos) {
case 0:
return new Home(db);
case 2:
return new Songs(db);
case 3:
return new Artists(db);
case 1:
return new Album(db);
case 4:
return new PlayList(db);
default:
return new Text("Error");
}
}
_onSelectItem(int index) {
setState(() => _selectedDrawerIndex = index);
getDrawerItemWidget(_selectedDrawerIndex);
title = widget.bottomItems[index].title;
}
@override
void initState() {
super.initState();
initPlayer();
getSharedData();
}
void initTheme() async {
var pref = await SharedPreferences.getInstance();
var val = pref.getInt("theme");
print("theme=$val");
if (val == 1) {
color = Theme.of(context).primaryColor;
setState(() {
themeLoading = false;
});
}
}
void initPlayer() async {
db = new DatabaseClient();
await db.create();
if (await db.alreadyLoaded()) {
setState(() {
isLoading = false;
getLast();
});
} else {
var songs;
try {
songs = await MusicFinder.allSongs();
} catch (e) {
print("failed to get songs");
}
List list = new List.from(songs);
for (Song song in list) db.upsertSOng(song);
if (!mounted) {
return;
}
setState(() {
isLoading = false;
getLast();
});
}
}
getSharedData() async {
const platform = const MethodChannel('app.channel.shared.data');
Map sharedData = await platform.invokeMethod("getSharedData");
if (sharedData != null) {
if (sharedData["albumArt"] == "null") {
sharedData["albumArt"] = null;
}
Song song = new Song(
9999 /random/,
sharedData["artist"],
sharedData["title"],
sharedData["album"],
null,
int.parse(sharedData["duration"]),
sharedData["uri"],
sharedData["albumArt"]);
List list = new List();
list.add((song));
MyQueue.songs = list;
Navigator.of(context).push(new MaterialPageRoute(builder: (context) {
return new NowPlaying(null, list, 0, 0);
}));
}
}
@override
void dispose() {
super.dispose();
}
void getLast() async {
last = await db.fetchLastSong();
songs = await db.fetchSongs();
setState(() {
songs = songs;
});
}
GlobalKey scaffoldState = new GlobalKey();
@override
Widget build(BuildContext context) {
var bottomOptions = [];
for (var i = 0; i < widget.bottomItems.length; i++) {
var d = widget.bottomItems[i];
bottomOptions.add(
new BottomNavigationBarItem(
icon: new Icon(
d.icon,
),
title: new Text(d.title),
backgroundColor: Theme.of(context).primaryColor,
),
);
}
return new WillPopScope(
child: new Scaffold(
key: scaffoldState,
appBar: _selectedDrawerIndex == 0
? null
: new AppBar(
title: new Text(title),
actions: [
new IconButton(icon: Icon(Icons.search), onPressed: null)
],
),
floatingActionButton: new FloatingActionButton(
child: new Icon(Icons.play_circle_filled),
onPressed: () async {
var pref = await SharedPreferences.getInstance();
var fp = pref.getBool("played");
if (fp == null) {
scaffoldState.currentState.showSnackBar(
new SnackBar(content: Text("Play your first song.")));
} else {
Navigator
.of(context)
.push(new MaterialPageRoute(builder: (context) {
if (MyQueue.songs == null) {
List list = new List();
list.add(last);
MyQueue.songs = list;
return new NowPlaying(db, list, 0, 0);
} else
return new NowPlaying(db, MyQueue.songs, MyQueue.index, 1);
}));
}
}),
drawer: new Drawer(
child: new Column(
children: [
new UserAccountsDrawerHeader(
accountName: new Text("Music player"), accountEmail: null),
new Column(
children: [
new ListTile(
leading: new Icon(Icons.settings,
color: Theme.of(context).accentColor),
title: new Text("Settings"),
onTap: () {
Navigator.of(context).pop();
Navigator
.of(context)
.push(new MaterialPageRoute(builder: (context) {
return new Settings();
}));
}),
],
)
],
),
),
body: isLoading
? new Center(
child: new CircularProgressIndicator(),
)
: getDrawerItemWidget(_selectedDrawerIndex),
bottomNavigationBar: new BottomNavigationBar(
items: bottomOptions,
onTap: (index) => _onSelectItem(index),
currentIndex: _selectedDrawerIndex,
),
),
onWillPop: _onWillPop,
);
}
Future _onWillPop() {
if (_selectedDrawerIndex != 0) {
setState(() {
selectedDrawerIndex = 0;
});
return(null);
} else
return showDialog(
context: context,
builder: ()=> new AlertDialog(
title: new Text('Are you sure?'),
content: new Text('music player will be stopped..'),
actions: [
new FlatButton(
onPressed: () => Navigator.of(context).pop(false),
child: new Text(
'No',
),
),
new FlatButton(
onPressed: () {
MyQueue.player.stop();
Navigator.of(context).pop(true);
},
child: new Text('Yes'),
),
],
),
) ??
false;
}
}
class BottomItem {
String title;
IconData icon;
BottomItem(this.title, this.icon);
}
`
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