我正在做一个无线电应用程序（Tune In like）
情况：
两个问题：
使用AACDecoder库只有两种方法 - 开始（） - 停止（）
这些方法会相互干扰并让玩家处于不确定状态
我使用此代码启动播放器：
public void start(String url) throws Exception {
if (mPlayer == null) {
mPlayer = new MultiPlayer(this);
}
mPlayer.playAsync(url);
mState = StreamingState.PREPARING;
}
然后像这样停止：
public void stop() {
if (mPlayer == null) {
return;
}
try {
mPlayer.stop();
mPlayer = null;
} catch (Exception e) {
}
setState(StreamingState.STOPPING);
}
我使用这个回调接口：
static interface RadioPlayerCallBack {
public void radioPlayerStarted();
public void radioPlayerStopped(int perf);
public void radioPlayerException(Throwable e);
public void radioPlayerMetadata(String key, String value);
public void radioPlayerPCMFeedBuffer(boolean isPlaying, int audioBufferSizeMs, int audioBufferCapacityMs);
}
并使用此枚举更新播放器的状态：
public enum StreamingState {
EMPTY, // media player rested or releasedS
CREATED, // created ready to prepare
PREPARING, // preparing...
PREPARED, // prepared
STARTED, // started, and maybe playing (ready to play)
PAUSED, // paused (media player ready!)
STOPPED, // stopped and not prepared to play
ERROR, // an error occured, mediaplayer is reseted
STOPPING, // startAsync after stop
}
我无法找到解决方案停止（） - ＆gt;在已播放流的播放器上启动（网址），同时保护播放器的状态（我必须考虑网络的延迟）
我如何实现这一目标？
修改
以下是对事情进展情况的快速了解：
[ PlayerActivity - ＆gt; StreamingService - ＆gt;的 PlayerObject
按顺序：
点击按钮播放 - ＆gt;从StreamingService调用方法playRadio通过实例获取来自serviceConnection-＆gt;来自PlayerObject的调用方法播放 - ＆gt; playerState =开始 - ＆gt;方法playerStarted auto-called - ＆gt; playerState =已启动 - ＆gt;来自StreamingService的回调方法 - ＆gt;广播意图通知UI - ＆gt; ui得到意图并更新界面...
这是BroadcastReceiver：
final private BroadcastReceiver mPlayBackReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String actionString = intent.getAction();
if (actionString == ServiceStreaming.SERVICE_PLAY) {
} else if (actionString == ServiceStreaming.SERVICE_STOP) {
} else if (actionString == ServiceStreaming.SERVICE_LOADING) {
} else if (actionString == ServiceStreaming.SERVICE_ERROR) {
} else if (actionString == ServiceStreaming.SERVICE_KILLED) {
}
}
};
Somethimes我得到了这个例外：
06-04 10:15:43.531: E/AudioTrack(8218): AudioFlinger could not create track, status: -12
06-04 10:15:43.531: E/AudioTrack-JNI(8218): Error initializing AudioTrack
06-04 10:15:43.531: E/android.media.AudioTrack(8218): Error code -20 when initializing AudioTrack.
06-04 10:15:43.531: E/PCMFeed(8218): error in playback feed: -3
06-04 10:15:43.541: E/BufferReader(8218): Exception when reading: java.net.SocketException: Socket closed
06-04 10:15:43.901: A/libc(8218): Fatal signal 11 (SIGSEGV) at 0x76652748 (code=1), thread 8955 (Thread-5266)
06-04 10:15:43.911: E/AACPlayer(8218): playAsync():
06-04 10:15:43.911: E/AACPlayer(8218): java.lang.IllegalStateException
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.Decoder.start(Decoder.java:231)
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.AACPlayer.playImpl(AACPlayer.java:424)
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.AACPlayer.play(AACPlayer.java:386)
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.AACPlayer.play(AACPlayer.java:338)
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.AACPlayer$1.run(AACPlayer.java:296)
06-04 10:15:43.911: E/AACPlayer(8218): at java.lang.Thread.run(Thread.java:841)
答案 0 :(得分：1)
我认为应该通过回调函数来完成playercallback接口，可以在这里找到：
并且AACPlayer本身的功能是：
/**
* Sets the PlayerCallback.
* NOTE: this should be set BEFORE any of the play methods are called.
*/
public void setPlayerCallback( PlayerCallback playerCallback )
然后当玩家停止时执行此功能：
/**
* This method is called when the player is stopped.
* Note: __after__ this method the method playerException might be also called.
*/
public void playerStopped( int perf );
将重启逻辑放在此函数中。
链接到aacPlayer的来源：
使用aacPlayer有一个指向Activity源的链接： https://code.google.com/p/aacplayer-android/source/browse/trunk/src/com/spoledge/aacplayer/AACPlayerActivity.java
你应该注意到在回调函数中使用了一个Handler，而一个代码是在不在玩家线程中执行的单独线程中执行的：
public void playerStopped( final int perf ) {
uiHandler.post( new Runnable() {
public void run() {
enableButtons();
...
playerStarted = false;
}
});
}
Somethimes我得到了这个例外：
06-04 10:15:43.531: E/AudioTrack(8218): AudioFlinger could not create track, status: -12
06-04 10:15:43.531: E/AudioTrack-JNI(8218): Error initializing AudioTrack
06-04 10:15:43.531: E/android.media.AudioTrack(8218): Error code -20 when initializing AudioTrack.
06-04 10:15:43.531: E/PCMFeed(8218): error in playback feed: -3
06-04 10:15:43.541: E/BufferReader(8218): Exception when reading: java.net.SocketException: Socket closed
06-04 10:15:43.901: A/libc(8218): Fatal signal 11 (SIGSEGV) at 0x76652748 (code=1), thread 8955 (Thread-5266)
06-04 10:15:43.911: E/AACPlayer(8218): playAsync():
06-04 10:15:43.911: E/AACPlayer(8218): java.lang.IllegalStateException
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.Decoder.start(Decoder.java:231)
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.AACPlayer.playImpl(AACPlayer.java:424)
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.AACPlayer.play(AACPlayer.java:386)
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.AACPlayer.play(AACPlayer.java:338)
06-04 10:15:43.911: E/AACPlayer(8218): at com.spoledge.aacdecoder.AACPlayer$1.run(AACPlayer.java:296)
06-04 10:15:43.911: E/AACPlayer(8218): at java.lang.Thread.run(Thread.java:841)
链接到simmilar问题：
Android Application crashes after generating an audio signal a few times