1 -setupApplicationAudio//声音文件及播放器的准备
2 选择播放器
3 - (void) updatePlayerQueueWithMediaCollection: (MPMediaItemCollection *) mediaItemCollection//更新播放器列表
复制代码
1 - (void) setupApplicationAudio {
2
3 // Gets the file system path to the sound to play.
4 NSString *soundFilePath = [[NSBundle mainBundle]pathForResource: @"sound" ofType:@"caf" ];
6 // Converts the sound's file path to an NSURL object
7 NSURL *newURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];
8 self.soundFileURL = newURL;
9 [newURL release];
10 // Registers this class as the delegate of the audio session.
11 [[AVAudioSession sharedInstance] setDelegate: self];
12
13 // The AmbientSound category allows application audio to mix with Media Player
14 // audio. The category also indicates that application audio should stop playing
15 // if the Ring/Siilent switch is set to "silent" or the screen locks.
16 [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient error: nil];
17 // Registers the audio route change listener callback function
18 AudioSessionAddPropertyListener (
19 kAudioSessionProperty_AudioRouteChange,
20 audioRouteChangeListenerCallback,
21 self
22 );
23 // Activates the audio session.
24
25 NSError *activationError = nil;
26 [[AVAudioSession sharedInstance] setActive: YES error: &activationError];
27 // Instantiates the AVAudioPlayer object, initializing it with the sound
28 AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: soundFileURL error: nil];
29 self.appSoundPlayer = newPlayer;
30 [newPlayer release];
31
32 // "Preparing to play" attaches to the audio hardware and ensures that playback
33 // starts quickly when the user taps Play
34 [appSoundPlayer prepareToPlay];
35 [appSoundPlayer setVolume: 1.0];
36 [appSoundPlayer setDelegate: self];
37 }
1 //选择播放器
2 if ([self useiPodPlayer]) {
3
4 [self setMusicPlayer: [MPMusicPlayerController iPodMusicPlayer]];
5
6 if ([musicPlayer nowPlayingItem])
{
7
8 navigationBar.topItem.leftBarButtonItem.enabled = YES;
9
10 // Update the UI to reflect the now-playing item.
11 [self handle_NowPlayingItemChanged: nil];
12
13 if ([musicPlayer playbackState] == MPMusicPlaybackStatePaused)
{
14 navigationBar.topItem.leftBarButtonItem = playBarButton;
15 }
16 }
17
18 }
else {
19
20 [self setMusicPlayer: [MPMusicPlayerController applicationMusicPlayer]];
21
22 // By default, an application music player takes on the shuffle and repeat modes
23 // of the built-in iPod app. Here they are both turned off.
24 [musicPlayer setShuffleMode: MPMusicShuffleModeOff];
25 [musicPlayer setRepeatMode: MPMusicRepeatModeNone];
26 }
1 - (void) updatePlayerQueueWithMediaCollection: (MPMediaItemCollection *) mediaItemCollection {
2 // Configure the music player, but only if the user chose at least one song to play
3 if (mediaItemCollection) {
4 // If there's no playback queue yet...
5 if (userMediaItemCollection == nil) {
6
7 // apply the new media item collection as a playback queue for the music player
8 [self setUserMediaItemCollection: mediaItemCollection];
9 [musicPlayer setQueueWithItemCollection: userMediaItemCollection];
10 [self setPlayedMusicOnce: YES];
11 [musicPlayer play];
12 // Obtain the music player's state so it can then be
13 // restored after updating the playback queue.
14 } else {
15 // Take note of whether or not the music player is playing. If it is
16 // it needs to be started again at the end of this method.
17 BOOL wasPlaying = NO;
18 if (musicPlayer.playbackState == MPMusicPlaybackStatePlaying) {
19 wasPlaying = YES;
20 }
21
22 // Save the now-playing item and its current playback time.
23 MPMediaItem *nowPlayingItem = musicPlayer.nowPlayingItem;
24 NSTimeInterval currentPlaybackTime = musicPlayer.currentPlaybackTime;
25 // Combine the previously-existing media item collection with the new one
26 NSMutableArray *combinedMediaItems = [[userMediaItemCollection items] mutableCopy];
27 NSArray *newMediaItems = [mediaItemCollection items];
28 [combinedMediaItems addObjectsFromArray: newMediaItems];
29
30 [self setUserMediaItemCollection: [MPMediaItemCollection collectionWithItems: (NSArray *) combinedMediaItems]];
31 [combinedMediaItems release];
32 // Apply the new media item collection as a playback queue for the music player.
33 [musicPlayer setQueueWithItemCollection: userMediaItemCollection];
34
35 // Restore the now-playing item and its current playback time.
36 musicPlayer.nowPlayingItem = nowPlayingItem;
37 musicPlayer.currentPlaybackTime = currentPlaybackTime;
38
39 // If the music player was playing, get it playing again.
40 if (wasPlaying) {
41 [musicPlayer play];
42 }
43 }
44 // Finally, because the music player now has a playback queue, ensure that
45 // the music play/pause button in the Navigation bar is enabled.
46 navigationBar.topItem.leftBarButtonItem.enabled = YES;
47 [addOrShowMusicButton setTitle: NSLocalizedString (@"Show Music", @"Alternate title for 'Add Music' button, after user has chosen some music")
48 forState: UIControlStateNormal];
49 }
50 }