IOS使用AVAudioPlayer播放mp3歌曲文件并监听来电打断

本实例实现了AVAudioPlayer播放mp3歌曲文件，实现了播放、暂停、继续操作，音乐音量控制、播放进度显示，同时监听来电打断事件

一、控件初始化

1. - (void)viewDidLoad
2. {
3. [super viewDidLoad];
4. // Do any additional setup after loading the view.
5. //初始化三个button
6. UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
7. [button setFrame:CGRectMake(100, 100, 60, 40)];
8. [button setTitle:@"Play" forState:UIControlStateNormal];
9. [button addTarget:self action:@selector(play) forControlEvents:UIControlEventTouchUpInside];
10. [self.view addSubview:button];
11. UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
12. [button1 setFrame:CGRectMake(100, 150, 60, 40)];
13. [button1 setTitle:@"pause" forState:UIControlStateNormal];
14. [button1 addTarget:self action:@selector(pause) forControlEvents:UIControlEventTouchUpInside];
15. [self.view addSubview:button1];
16. UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
17. [button2 setFrame:CGRectMake(100, 200, 60, 40)];
18. [button2 setTitle:@"stop" forState:UIControlStateNormal];
19. [button2 addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside];
20. [self.view addSubview:button2];
21. NSString *string = [[NSBundle mainBundle] pathForResource:@"陶钰玉 - 深夜地下铁" ofType:@"mp3"];
22. //把音频文件转换成url格式
23. NSURL *url = [NSURL fileURLWithPath:string];
24. //初始化音频类 并且添加播放文件
25. avAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
26. //设置代理
27. avAudioPlayer.delegate = self;
28. //设置初始音量大小
29. // avAudioPlayer.volume = 1;
30. //设置音乐播放次数  -1为一直循环
31. avAudioPlayer.numberOfLoops = -1;
32. //预播放
33. [avAudioPlayer prepareToPlay];
34. //初始化一个播放进度条
35. progressV = [[UIProgressView alloc] initWithFrame:CGRectMake(20, 50, 200, 20)];
36. [self.view addSubview:progressV];
37. //[progressV release];
38. //用NSTimer来监控音频播放进度
39. timer = [NSTimer scheduledTimerWithTimeInterval:0.1
40. target:self
41. selector:@selector(playProgress)                                                     userInfo:nil
42. repeats:YES];
43. //初始化音量控制
44. volumeSlider = [[UISlider alloc] initWithFrame:CGRectMake(20, 70, 200, 20)];
45. [volumeSlider addTarget:self action:@selector(volumeChange)
46. forControlEvents:UIControlEventValueChanged];
47. //设置最小音量
48. volumeSlider.minimumValue = 0.0f;
49. //设置最大音量
50. volumeSlider.maximumValue = 10.0f;
51. //初始化音量为多少
52. volumeSlider.value = 5.0f;
53. [self.view addSubview:volumeSlider];
54. //[volumeSlider release];
55. //声音开关控件(静音)
56. UISwitch *swith = [[UISwitch alloc] initWithFrame:CGRectMake(100, 20, 60, 40)];
57. [swith addTarget:self action:@selector(onOrOff:) forControlEvents:UIControlEventValueChanged];
58. //默认状态为打开
59. swith.on = YES;
60. [self.view addSubview:swith];
61. //[swith  release];
62. }

播放控制

1. //播放
2. - (void)play
3. {
4. [avAudioPlayer play];
5. }
6. //暂停
7. - (void)pause
8. {
9. [avAudioPlayer pause];
10. }
11. //停止
12. - (void)stop
13. {
14. avAudioPlayer.currentTime = 0;  //当前播放时间设置为0
15. [avAudioPlayer stop];
16. }
17. //播放进度条
18. - (void)playProgress
19. {
20. //通过音频播放时长的百分比,给progressview进行赋值;
21. progressV.progress = avAudioPlayer.currentTime/avAudioPlayer.duration;
22. }
23. //声音开关(是否静音)
24. - (void)onOrOff:(UISwitch *)sender
25. {
26. avAudioPlayer.volume = sender.on;
27. }
28. //播放音量控制
29. - (void)volumeChange
30. {
31. avAudioPlayer.volume = volumeSlider.value;
32. }
33. //播放完成时调用的方法  (代理里的方法),需要设置代理才可以调用
34. - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
35. {
36. [timer invalidate]; //NSTimer暂停   invalidate  使...无效;
37. }

二、调用播放器并监听来电打断事件

1. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
2. {
3. self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
4. // Override point for customization after application launch.
5. AVAudioSession *session = [AVAudioSession sharedInstance];
6. [session setActive:YES error:nil];
7. [session setCategory:AVAudioSessionCategoryPlayback error:nil];
8. firstVC = [[FirstVC alloc] init];
9. self.window.rootViewController = firstVC;
10. [firstVC viewDidLoad];
11. [firstVC play];
12. self.window.backgroundColor = [UIColor whiteColor];
13. [self.window makeKeyAndVisible];
14. AudioSessionInitialize(NULL, NULL, interruptionListenner, (__bridge void*)self);
15. return YES;
16. }

1. void interruptionListenner(void* inClientData, UInt32 inInterruptionState)
2. {
3. ZTAppDelegate* pTHIS = (__bridge ZTAppDelegate*)inClientData;
4. if (pTHIS) {
5. NSLog(@"interruptionListenner %lu", inInterruptionState);
6. if (kAudioSessionBeginInterruption == inInterruptionState) {
7. NSLog(@"Begin interruption");
8. [pTHIS.self.firstVC pause];
9. }
10. else
11. {
12. NSLog(@"Begin end interruption");
13. [pTHIS.self.firstVC play];
14. NSLog(@"End end interruption");
15. }
16. }
17. }

代码是参考网上现有质料并稍加改动

源码下载地址：http://pan.baidu.com/s/1eP29x