在Flutter上编码游戏，当应用程序以音频播放器启动时，想要在后台循环播放音乐：^0.20.1包和WidgetsBindingObserver，不起作用！音频无法播放。
另一个"；。wav"；格式与"；AudioCache"；。但是"；AudioCache"；没有暂停和恢复属性。厌倦了"；AudioPlayer"；以及"；。mp3"；扩展音频无法播放。但还是一样；。mp3"；扩展音频播放；AudioCache"；。
检查下方的代码
import 'dart:async';
import 'package:bugbee2/barrier.dart';
import 'package:bugbee2/bee.dart';
import 'package:bugbee2/coverScreen.dart';
import 'package:flutter/material.dart';
import 'package:audioplayers/audioplayers.dart';
import 'package:shared_preferences/shared_preferences.dart';
class HomePage extends StatefulWidget {
const HomePage({Key? key}) : super(key: key);
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
// bee variables
static double beeY = 0;
double initialPos = beeY;
double height = 0;
double time = 0;
double gravity = -4.9; // how strong the gravity is
double velocity = 3.5; // how strong the jump is
double beeWidth = 0.1; // out of 2, 2 being the entire width of the screen
double beeHeight = 0.1; // out of 2, 2 being the entire height of the screen
// inciment score
int score = 0;
int bestScore = 0;
// game settings
bool gameHasStarted = false;
// Best Score Value Update
@override
void initState() {
super.initState();
checkBestScore();
WidgetsBinding.instance?.addObserver(this);
}
// Remove Observer
@override
void dispose() {
WidgetsBinding.instance?.removeObserver(this);
super.dispose();
}
// Background Music
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
AudioPlayer player = AudioPlayer();
super.didChangeAppLifecycleState(state);
if (state == AppLifecycleState.resumed) {
player.play("sounds/tea-ceremony.mp3");
} else if (state == AppLifecycleState.paused) {
player.pause();
} else if (state == AppLifecycleState.inactive) {
player.pause();
} else if (state == AppLifecycleState.detached) {
player.stop();
}
}
// Saving Best Score
getBestScore() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
int bestScore = prefs.getInt('bestScore') ?? 0;
return bestScore;
}
setBestScore() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
prefs.setInt('bestScore', bestScore);
}
// barrier variables
static List<double> barrierX = [2, 2 + 1.5];
static double barrierWidth = 0.5; // out of 2
List<List<double>> barrierHeight = [
// out of 2, where 2 is the entire height of the screen
// [topHeight, bottomHeight]
[0.6, 0.4],
[0.4, 0.6],
];
void startGame() {
final player = AudioCache();
player.play(
"sounds/jump.wav",
);
gameHasStarted = true;
Timer.periodic(Duration(milliseconds: 10), (timer) {
// a real physical jump is the same as an upside down parabola
// so this is a simple quadratic equation
height = gravity * time * time + velocity * time;
setState(() {
beeY = initialPos - height;
});
// check if bird is dead
if (beeIsDead()) {
timer.cancel();
_showDialog();
final player = AudioCache();
player.play(
"sounds/slide-hit.wav",
);
}
// keep the map moving (move barriers)
moveMap();
// keep the time going!
time += 0.01;
});
}
void moveMap() {
for (int i = 0; i < barrierX.length; i++) {
// keep barriers moving
setState(() {
barrierX[i] -= 0.005;
});
// if barrier exits the left part of the screen, keep it looping
if (barrierX[i] < -1.5) {
barrierX[i] += 3;
score++;
final player = AudioCache();
player.play(
"sounds/coin-touch.wav",
);
setBestScore();
if (score > bestScore) {
bestScore = score;
}
}
}
}
checkBestScore() async {
int tempBestScore = await getBestScore() ?? 0;
setState(() {
bestScore = tempBestScore;
});
}
void resetGame() {
Navigator.pop(context); // dismisses the alert dialog
setState(() {
beeY = 0;
gameHasStarted = false;
time = 0;
initialPos = beeY;
barrierX = [2, 2 + 1.5];
score = 0;
});
}
void _showDialog() {
showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return AlertDialog(
backgroundColor: Colors.brown,
title: Center(
child: Text(
"G A M E O V E R",
style: TextStyle(color: Colors.white),
),
),
actions: [
GestureDetector(
onTap: resetGame,
child: ClipRRect(
borderRadius: BorderRadius.circular(5),
child: Container(
padding: EdgeInsets.all(7),
color: Colors.white,
child: Text(
'PLAY AGAIN',
style: TextStyle(color: Colors.brown),
),
),
),
),
],
);
});
}
void jump() {
final player = AudioCache();
player.play(
"sounds/jump.wav",
);
setState(() {
time = 0;
initialPos = beeY;
});
}
bool beeIsDead() {
// check if the bird is hitting the top or the bottom of the screen
if (beeY < -1 || beeY > 1) {
return true;
}
// hits barriers
// checks if bird is within x coordinates and y coordinates of barriers
for (int i = 0; i < barrierX.length; i++) {
if (barrierX[i] <= beeWidth &&
barrierX[i] + barrierWidth >= -beeWidth &&
(beeY <= -1 + barrierHeight[i][0] ||
beeY + beeHeight >= 1 - barrierHeight[i][1])) {
return true;
}
}
return false;
}
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: gameHasStarted ? jump : startGame,
child: Scaffold(
body: Column(
children: [
Expanded(
flex: 3,
child: Container(
color: Colors.blue.shade500,
child: Center(
child: Stack(
children: [
// bird
MyBee(
beeY: beeY,
beeWidth: beeWidth,
beeHeight: beeHeight,
),
// tap to play
MyCoverScreen(gameHasStarted: gameHasStarted),
MyBarrier(
barrierX: barrierX[0],
barrierWidth: barrierWidth,
barrierHeight: barrierHeight[0][0],
isThisBottomBarrier: false,
),
// Bottom barrier 0
MyBarrier(
barrierX: barrierX[0],
barrierWidth: barrierWidth,
barrierHeight: barrierHeight[0][1],
isThisBottomBarrier: true,
),
// Top barrier 1
MyBarrier(
barrierX: barrierX[1],
barrierWidth: barrierWidth,
barrierHeight: barrierHeight[1][0],
isThisBottomBarrier: false,
),
// Bottom barrier 1
MyBarrier(
barrierX: barrierX[1],
barrierWidth: barrierWidth,
barrierHeight: barrierHeight[1][1],
isThisBottomBarrier: true,
),
],
),
),
),
),
SizedBox(
height: 10,
child: Container(
color: Colors.green,
),
),
Expanded(
child: Container(
color: Colors.brown,
child: Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
score.toString(),
style: TextStyle(color: Colors.white, fontSize: 35),
),
SizedBox(
height: 15,
),
Text(
'S C O R E',
style: TextStyle(color: Colors.white, fontSize: 20),
),
],
),
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
bestScore.toString(),
style: TextStyle(color: Colors.white, fontSize: 35),
),
SizedBox(
height: 15,
),
Text(
'B E S T',
style: TextStyle(color: Colors.white, fontSize: 20),
),
],
),
],
),
),
),
),
],
),
),
);
}
}
我正在使用音频播放器：^0.19.1
AudioPlayer advancedPlayer;
AudioCache audioCache;
String audioCorrect = "audio/access_granted.mp3";
我有一个调用initState((的方法
void initPlayer() {
advancedPlayer = new AudioPlayer();
audioCache = new AudioCache(fixedPlayer: advancedPlayer);
}
我用这种方式播放音频
audioCache.play(audioCorrect);