android - Android startBluetoothSco未启动sco但isBluetoothScoOn返回true

我创建了一个带有示例项目的GitHub存储库，该示例项目显示了我在此处询问的以下问题:
https://github.com/paulpv/audio-loopback/tree/simplified/src/com/twistpair/wave/experimental/loopback
(请坚持使用“简化”分支，而忽略“主”分支)

两个主要文件是:

https://github.com/paulpv/audio-loopback/blob/simplified/src/com/twistpair/wave/experimental/loopback/MainActivity.java

https://github.com/paulpv/audio-loopback/blob/simplified/src/com/twistpair/wave/experimental/loopback/AudioStateManager.java

免责声明:我目前仅使用运行CyanogenMod 10 Jelly Bean的单个Samsung Epic SPH-D700进行编码和测试。我没有在其他设备上尝试过此方法，但是也许这可能有助于阻止我将头发拔出并发疯。

我一直在努力将Android蓝牙SCO可靠地传递到的启动和停止以及捕获/播放音频 FOR MONTHS !
一旦我可以将手机设置为SCO模式，分别通过AudioRecord和AudioTrack进行捕获和回放就可以正常工作了。
我遇到的问题是我无法可靠地使手机进入SCO模式!

在“Internet”上使用startBluetoothSco()和setBluetoothScoOn(true)的示例似乎都很简单明了，但是当我在设备上使用它们时，它们几乎永远无法可靠地工作。
我创建了自己的测试应用程序，除了启动和停止SCO外什么也不做，我什至无法使它可靠地工作!

我的代码监听BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED EXTRA_STATE==CONNECTED.我可以可靠地检测到何时连接或断开了任何耳机。

当检测到连接时，我的处理程序立即调用startBluetoothSco()。
A可能会发誓，至少将SCO_AUDIO_STATE踢到NNECTED的C O了，但是99％的时间它只会导致从DISCONNECTED->CONNECTING->DISCONNECTED过渡。

这是我的GitHub示例应用程序中带注释的日志输出:

10-03 17:00:13.970: I/dalvikvm(29487): Debugger is active
10-03 17:00:14.158: I/System.out(29487): Debugger has connected
10-03 17:00:15.779: I/System.out(29487): waiting for debugger to settle...
10-03 17:00:15.978: I/System.out(29487): debugger has settled (1325)

我的应用程序在关闭Jawbone耳机的情况下启动，并更新了UI ...

10-03 17:00:16.568: D/MainActivity(29487): updateScreen()...
10-03 17:00:16.572: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=false

... UI更新完成
即时广播，可告诉我当前的SCO_AUDIO_STATE ...

10-03 17:00:16.689: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.media.ACTION_SCO_AUDIO_STATE_UPDATED flg=0x10 (has extras) }
10-03 17:00:16.689: D/AudioStateManager(29487): extras={"android.media.extra.SCO_AUDIO_PREVIOUS_STATE"=2, "android.media.extra.SCO_AUDIO_STATE"=0}
10-03 17:00:16.689: D/AudioStateManager(29487): android.media.ACTION_SCO_AUDIO_STATE_UPDATED
10-03 17:00:16.693: D/AudioStateManager(29487): ==> scoAudioStatePrevious=SCO_AUDIO_STATE_CONNECTING(2)
10-03 17:00:16.693: D/AudioStateManager(29487): ==> scoAudioState=SCO_AUDIO_STATE_DISCONNECTED(0)
10-03 17:00:16.693: D/AudioStateManager(29487): android.media.ACTION_SCO_AUDIO_STATE_UPDATED: SCO_AUDIO_STATE_DISCONNECTED

...当前的SCO_AUDIO_STATE ==已断开连接；没问题，因为我的耳机已关闭。
调用我的SCO Disconnected事件监听器，并使用两个sendMessages更新UI ...

10-03 17:00:16.693: I/MainActivity(29487): onAudioManagerScoAudioDisconnected()
10-03 17:00:16.755: D/libEGL(29487): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so
10-03 17:00:16.787: D/libEGL(29487): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so
10-03 17:00:16.791: D/libEGL(29487): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
10-03 17:00:16.888: D/OpenGLRenderer(29487): Enabling debug mode 0
10-03 17:00:16.912: D/MainActivity(29487): MSG_UPDATE_BLUETOOTH_INDICATION
10-03 17:00:16.912: D/MainActivity(29487): updateScreen()...
10-03 17:00:16.912: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=false
10-03 17:00:16.927: D/MainActivity(29487): MSG_UPDATE_AUDIO_OUTPUT_STREAM_TYPE
10-03 17:00:16.927: D/MainActivity(29487): updateScreen()...
10-03 17:00:16.931: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=false

... UI更新完成

约20秒后，我打开Jawbone耳机...

10-03 17:00:37.572: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.bluetooth.headset.profile.action.CONNECTION_STATE_CHANGED flg=0x10 (has extras) }
10-03 17:00:37.583: D/AudioStateManager(29487): extras={"android.bluetooth.device.extra.DEVICE"=00:21:3C:00:3E:02, "android.bluetooth.profile.extra.PREVIOUS_STATE"=0, "android.bluetooth.profile.extra.STATE"=1}
10-03 17:00:37.587: D/AudioStateManager(29487): mReceiver: BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED
10-03 17:00:37.587: D/AudioStateManager(29487): ==> bluetoothDevice=00:21:3C:00:3E:02
10-03 17:00:37.587: D/AudioStateManager(29487): ==> bluetoothHeadsetStatePrevious=STATE_DISCONNECTED(0)
10-03 17:00:37.587: D/AudioStateManager(29487): ==> bluetoothHeadsetState=STATE_CONNECTING(1)
10-03 17:00:37.619: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.bluetooth.headset.profile.action.CONNECTION_STATE_CHANGED flg=0x10 (has extras) }
10-03 17:00:37.623: D/AudioStateManager(29487): extras={"android.bluetooth.device.extra.DEVICE"=00:21:3C:00:3E:02, "android.bluetooth.profile.extra.PREVIOUS_STATE"=1, "android.bluetooth.profile.extra.STATE"=2}
10-03 17:00:37.623: D/AudioStateManager(29487): mReceiver: BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED
10-03 17:00:37.623: D/AudioStateManager(29487): ==> bluetoothDevice=00:21:3C:00:3E:02
10-03 17:00:37.626: D/AudioStateManager(29487): ==> bluetoothHeadsetStatePrevious=STATE_CONNECTING(1)
10-03 17:00:37.626: D/AudioStateManager(29487): ==> bluetoothHeadsetState=STATE_CONNECTED(2)

颚骨已连接；我的事件监听器称为...

10-03 17:00:37.626: I/MainActivity(29487): onBluetoothHeadsetConnected()

...看到我们可以上合组织...

10-03 17:00:37.626: D/AudioStateManager(29487): mAudioManager.isBluetoothScoAvailableOffCall()=true

...并自动调用startBluetoothSco()
这里是问题所在!为什么调用startBluetoothSco不会导致SCO_AUDIO_STATE == CONNECTED？!？!

10-03 17:00:37.626: D/AudioStateManager(29487): startBluetoothSco()
10-03 17:00:37.626: I/AudioStateManager(29487): mAudioManager.startBluetoothSco();

我的事件监听器完成了一个sendMessage来更新带有当前BT状态的UI ...

10-03 17:00:37.646: D/MainActivity(29487): MSG_UPDATE_BLUETOOTH_INDICATION
10-03 17:00:37.650: D/MainActivity(29487): updateScreen()...
10-03 17:00:37.650: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=false

... UI更新完成
startBluetoothSco的第一个结果是...

10-03 17:00:37.681: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.media.ACTION_SCO_AUDIO_STATE_UPDATED flg=0x10 (has extras) }
10-03 17:00:37.681: D/AudioStateManager(29487): extras={"android.media.extra.SCO_AUDIO_STATE"=2, "android.media.extra.SCO_AUDIO_PREVIOUS_STATE"=0}
10-03 17:00:37.681: D/AudioStateManager(29487): android.media.ACTION_SCO_AUDIO_STATE_UPDATED
10-03 17:00:37.685: D/AudioStateManager(29487): ==> scoAudioStatePrevious=SCO_AUDIO_STATE_DISCONNECTED(0)
10-03 17:00:37.685: D/AudioStateManager(29487): ==> scoAudioState=SCO_AUDIO_STATE_CONNECTING(2)

...已从“断开连接”移至“正在连接”
startBluetoothSco的第二个结果出现在...

10-03 17:00:37.759: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.media.ACTION_SCO_AUDIO_STATE_UPDATED flg=0x10 (has extras) }
10-03 17:00:37.763: D/AudioStateManager(29487): extras={"android.media.extra.SCO_AUDIO_STATE"=0, "android.media.extra.SCO_AUDIO_PREVIOUS_STATE"=2}
10-03 17:00:37.763: D/AudioStateManager(29487): android.media.ACTION_SCO_AUDIO_STATE_UPDATED
10-03 17:00:37.763: D/AudioStateManager(29487): ==> scoAudioStatePrevious=SCO_AUDIO_STATE_CONNECTING(2)
10-03 17:00:37.763: D/AudioStateManager(29487): ==> scoAudioState=SCO_AUDIO_STATE_DISCONNECTED(0)
10-03 17:00:37.763: D/AudioStateManager(29487): android.media.ACTION_SCO_AUDIO_STATE_UPDATED: SCO_AUDIO_STATE_DISCONNECTED

...从CONNECTING移至 DISCONNECTED
我本来希望SCO从CONNECTING变为 CONNECTED !
我的事件监听器被调用并使用两个sendMessages更新UI ...

10-03 17:00:37.763: I/MainActivity(29487): onAudioManagerScoAudioDisconnected()
10-03 17:00:37.767: D/MainActivity(29487): MSG_UPDATE_BLUETOOTH_INDICATION
10-03 17:00:37.767: D/MainActivity(29487): updateScreen()...
10-03 17:00:37.767: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=false
10-03 17:00:37.783: D/MainActivity(29487): MSG_UPDATE_AUDIO_OUTPUT_STREAM_TYPE
10-03 17:00:37.783: D/MainActivity(29487): updateScreen()...
10-03 17:00:37.783: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=false

... UI更新完成

我等待〜20秒以连接SCO，但是它永远不会实现。
我按我的应用程序的“startBluetoothSco”按钮。
请注意，此结果完全相同，因此会在17:00:37.626启动bluetoothSco()
10-03 17:01:01.689: D/AudioStateManager(29487): startBluetoothSco() 10-03 17:01:01.689: I/AudioStateManager(29487): mAudioManager.startBluetoothSco();

startBluetoothSco的第一个结果是...
10-03 17:01:01.708: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.media.ACTION_SCO_AUDIO_STATE_UPDATED flg=0x10 (has extras) } 10-03 17:01:01.712: D/AudioStateManager(29487): extras={"android.media.extra.SCO_AUDIO_STATE"=2, "android.media.extra.SCO_AUDIO_PREVIOUS_STATE"=0} 10-03 17:01:01.712: D/AudioStateManager(29487): android.media.ACTION_SCO_AUDIO_STATE_UPDATED 10-03 17:01:01.712: D/AudioStateManager(29487): ==> scoAudioStatePrevious=SCO_AUDIO_STATE_DISCONNECTED(0) 10-03 17:01:01.712: D/AudioStateManager(29487): ==> scoAudioState=SCO_AUDIO_STATE_CONNECTING(2)

...已从“断开连接”移至“正在连接”
这是不同于17:00:37.626的startBluetoothSco()自动调用的地方
我们收到了 BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED 事件...
10-03 17:01:01.716: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.bluetooth.headset.profile.action.AUDIO_STATE_CHANGED flg=0x10 (has extras) } 10-03 17:01:01.720: D/AudioStateManager(29487): extras={"android.bluetooth.device.extra.DEVICE"=00:21:3C:00:3E:02, "android.bluetooth.profile.extra.PREVIOUS_STATE"=10, "android.bluetooth.profile.extra.STATE"=11} 10-03 17:01:01.720: D/AudioStateManager(29487): mReceiver: BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED 10-03 17:01:01.720: D/AudioStateManager(29487): ==> bluetoothDevice=00:21:3C:00:3E:02 10-03 17:01:01.720: D/AudioStateManager(29487): ==> bluetoothHeadsetAudioStatePrevious=STATE_AUDIO_DISCONNECTED(10) 10-03 17:01:01.720: D/AudioStateManager(29487): ==> bluetoothHeadsetAudioState=STATE_AUDIO_CONNECTING(11)

...已从“断开连接”移至“正在连接”
我们收到另一个BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED事件...
10-03 17:01:02.572: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.bluetooth.headset.profile.action.AUDIO_STATE_CHANGED flg=0x10 (has extras) } 10-03 17:01:02.576: D/AudioStateManager(29487): extras={"android.bluetooth.device.extra.DEVICE"=00:21:3C:00:3E:02, "android.bluetooth.profile.extra.PREVIOUS_STATE"=11, "android.bluetooth.profile.extra.STATE"=12} 10-03 17:01:02.576: D/AudioStateManager(29487): mReceiver: BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED 10-03 17:01:02.576: D/AudioStateManager(29487): ==> bluetoothDevice=00:21:3C:00:3E:02 10-03 17:01:02.576: D/AudioStateManager(29487): ==> bluetoothHeadsetAudioStatePrevious=STATE_AUDIO_CONNECTING(11) 10-03 17:01:02.580: D/AudioStateManager(29487): ==> bluetoothHeadsetAudioState=STATE_AUDIO_CONNECTED(12)

...从CONNECTING移至CONNECTED
事件使用一个sendMessage更新UI
10-03 17:01:02.580: I/MainActivity(29487): onBluetoothHeadsetAudioConnected() 10-03 17:01:02.580: D/MainActivity(29487): MSG_UPDATE_BLUETOOTH_INDICATION 10-03 17:01:02.580: D/MainActivity(29487): updateScreen()... 10-03 17:01:02.583: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=true

... UI更新完成(说实话，我不确定第二次调用isBluetoothSco是什么)
10-03 17:01:02.603: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=true

startBluetoothSco的第二个结果出现在...
10-03 17:01:02.603: D/AudioStateManager(29487): onReceive: intent=Intent { act=android.media.ACTION_SCO_AUDIO_STATE_UPDATED flg=0x10 (has extras) } 10-03 17:01:02.607: D/AudioStateManager(29487): extras={"android.media.extra.SCO_AUDIO_STATE"=1, "android.media.extra.SCO_AUDIO_PREVIOUS_STATE"=2} 10-03 17:01:02.607: D/AudioStateManager(29487): android.media.ACTION_SCO_AUDIO_STATE_UPDATED 10-03 17:01:02.607: D/AudioStateManager(29487): ==> scoAudioStatePrevious=SCO_AUDIO_STATE_CONNECTING(2) 10-03 17:01:02.607: D/AudioStateManager(29487): ==> scoAudioState=.SCO_AUDIO_STATE_CONNECTED(1) 10-03 17:01:02.607: D/AudioStateManager(29487): android.media.ACTION_SCO_AUDIO_STATE_UPDATED: SCO_AUDIO_STATE_CONNECTED

...从CONNECTING移至CONNECTED

最后!
我的事件监听器被调用并使用两个sendMessages更新UI ...
10-03 17:01:02.611: I/MainActivity(29487): onAudioManagerScoAudioConnected() 10-03 17:01:02.630: D/MainActivity(29487): MSG_UPDATE_BLUETOOTH_INDICATION 10-03 17:01:02.630: D/MainActivity(29487): updateScreen()... 10-03 17:01:02.634: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=true 10-03 17:01:02.650: D/MainActivity(29487): MSG_UPDATE_AUDIO_OUTPUT_STREAM_TYPE 10-03 17:01:02.650: D/MainActivity(29487): updateScreen()... 10-03 17:01:02.650: D/AudioStateManager(29487): mAudioManager.isBluetoothScoOn()=true

... UI更新完成

一段时间后，当我“手动”启动SCO时，一切(这次)都可以工作，但是如果我在连接耳机后立即自动启动SCO，则一切正常。

更糟的是，当事情没有按预期进行时，我在SCO状态中看到了奇怪的行为:
将startBluetoothSco()延迟3-5秒钟似乎没有什么区别。我没有尝试将其延迟超过5秒。等待5秒钟以上的音频开始流向BT耳机是荒谬的。
有时，即使自从上次DISCONNECTED状态说该状态已更改为CONNECTED以来从未收到广播事件，有时调用isBluetoothScoOn()也会返回true。
有时从UI中“手动”调用startBluetoothSco()不会执行任何操作，就像SCO已经打开一样，但是自从上次DISCONNECTED状态说状态变为CONNECTED以来，我从未收到任何广播事件。
尝试打开AudioTrack或AudioRecord时没有声音(当SCO正常运行时，相同的代码也可以正常工作，即:问题是SCO状态，而不是AudioTrack/AudioRecord调用)。
调用stopBluetoothSco()不会导致任何事件报告状态为DISCONNECTED。
setBluetoothScoOn(false/true)没有区别。老实说，我不理解看似多余的“startBluetoothSco()/stopBluetoothSco()”和“setBluetoothScoOn(boolean)”之间的区别。当一切正常时，我调用startBluetoothSco()会导致isBluetoothScoOn()返回true，这使我认为我不需要调用setBluetoothScoOn(true)。
重新启动电话没有什么影响。
重新启动耳机没有什么影响。
更改为其他耳机没有区别。
有时耳机会丢失其配对，必须重新配对。

鉴于Google/Android在蓝牙支持方面的往绩，这几乎没有让我感到惊讶。

有人可以让我摆脱困境，并明确解释如何在Android中可靠地启动和停止蓝牙SCO吗？

PS:是否有官方 channel 升级此类问题[w/Google？三星？]？或者，StackOverflow是我找到实际答案的最佳机会吗？

最佳答案

Android文档中缺少许多内容，但是，如果在音频路由期间每次都调用startBluetoothSco()和stopBluetoothSco()，则正确路由音频应该没有问题。
即使我已经看到连接长时间处于空闲状态，并启动StartBluetoothSco()，我们直接断开连接。
为了解决这个问题，我在这里写了一个解决方法:https://github.com/kodered/Bluetooth-Refresh-Logic

希望这可以帮助。
关于android - Android startBluetoothSco未启动sco但isBluetoothScoOn返回true，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/12737446/