我使用下面的代码来启动语音识别Android中：
PackageManager pm = getPackageManager();
List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
if (activities.size() == 0) {
displayWarning("This device does not support speech recognition");
return;
}
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
这工作得很好。 然而，这似乎并没有接受来自配对并使用“手机音频”模式连接蓝牙耳机的语音输入。
我可以使用一种称为应用程序的SOUNDabout给力“Media音频”，以“蓝牙（单声道）（SCO）”。 有了这个程序集，我的语音识别现在工作采取从我的耳机我的语音输入。
如何使用RecognizerIntent和蓝牙耳机获得的语音输入？
我在API级别16看到有一个新的意图行动ACTION_VOICE_SEARCH_HANDS_FREE 。 这是太新，我使用，但将这个解决我的问题？
我必须渣土在AudioManager左右（像我假设的SOUNDabout正在做）路由使用音频输入setBluetoothScoOn （）或startBluetoothSco （）？
清单权限
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BROADCAST_STICKY" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
创建一个内部类BluetoothHelper extends BluetoothHeadSetUtils在你Activity或Service 。 声明一个类构件mBluetoothHelper和在实例化它onCreate()
BluetoothHelper mBluetoothHelper;
@Override
public void onCreate()
{
mBluetoothHelper = new BluetoothHelper(this);
}
@Override
onResume()
{
mBluetoothHelper.start();
}
@Override
onPause()
{
mBluetoothHelper.stop();
}
// inner class
// BluetoothHeadsetUtils is an abstract class that has
// 4 abstracts methods that need to be implemented.
private class BluetoothHelper extends BluetoothHeadSetUtils
{
public BluetoothHelper(Context context)
{
super(context);
}
@Override
public void onScoAudioDisconnected()
{
// Cancel speech recognizer if desired
}
@Override
public void onScoAudioConnected()
{
// Should start speech recognition here if not already started
}
@Override
public void onHeadsetDisconnected()
{
}
@Override
public void onHeadsetConnected()
{
}
}
使用具有文本到语音的蓝牙耳机，你需要设置AudioManager打电话说话之前STREAM_VOICE_CALL。 或者使用下面的代码
protected void speak(String text)
{
HashMap<String, String> myHashRender = new HashMap<String, String>();
if (mBluetoothHelper.isOnHeadsetSco())
{
myHashRender.put(TextToSpeech.Engine.KEY_PARAM_STREAM,
String.valueOf(AudioManager.STREAM_VOICE_CALL));
}
mTts.speak(text, TextToSpeech.QUEUE_FLUSH, myHashRender);
}
在BluetoothHeadsetUtils类复制到项目。
import java.util.List;
import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothClass;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothHeadset;
import android.bluetooth.BluetoothProfile;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.AudioManager;
import android.os.Build;
import android.os.CountDownTimer;
import android.util.Log;
/**
* This is a utility to detect bluetooth headset connection and establish audio connection
* for android API >= 8. This includes a work around for API < 11 to detect already connected headset
* before the application starts. This work around would only fails if Sco audio
* connection is accepted but the connected device is not a headset.
*
* @author Hoan Nguyen
*
*/
public abstract class BluetoothHeadsetUtils
{
private Context mContext;
private BluetoothAdapter mBluetoothAdapter;
private BluetoothHeadset mBluetoothHeadset;
private BluetoothDevice mConnectedHeadset;
private AudioManager mAudioManager;
private boolean mIsCountDownOn;
private boolean mIsStarting;
private boolean mIsOnHeadsetSco;
private boolean mIsStarted;
private static final String TAG = "BluetoothHeadsetUtils"; //$NON-NLS-1$
/**
* Constructor
* @param context
*/
public BluetoothHeadsetUtils(Context context)
{
mContext = context;
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
}
/**
* Call this to start BluetoothHeadsetUtils functionalities.
* @return The return value of startBluetooth() or startBluetooth11()
*/
public boolean start()
{
if (!mIsStarted)
{
mIsStarted = true;
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
{
mIsStarted = startBluetooth();
}
else
{
mIsStarted = startBluetooth11();
}
}
return mIsStarted;
}
/**
* Should call this on onResume or onDestroy.
* Unregister broadcast receivers and stop Sco audio connection
* and cancel count down.
*/
public void stop()
{
if (mIsStarted)
{
mIsStarted = false;
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
{
stopBluetooth();
}
else
{
stopBluetooth11();
}
}
}
/**
*
* @return true if audio is connected through headset.
*/
public boolean isOnHeadsetSco()
{
return mIsOnHeadsetSco;
}
public abstract void onHeadsetDisconnected();
public abstract void onHeadsetConnected();
public abstract void onScoAudioDisconnected();
public abstract void onScoAudioConnected();
/**
* Register for bluetooth headset connection states and Sco audio states.
* Try to connect to bluetooth headset audio by calling startBluetoothSco().
* This is a work around for API < 11 to detect if a headset is connected before
* the application starts.
*
* The official documentation for startBluetoothSco() states
*
* "This method can be used by applications wanting to send and received audio to/from
* a bluetooth SCO headset while the phone is not in call."
*
* Does this mean that startBluetoothSco() would fail if the connected bluetooth device
* is not a headset?
*
* Thus if a call to startBluetoothSco() is successful, i.e mBroadcastReceiver will receive
* an ACTION_SCO_AUDIO_STATE_CHANGED with intent extra SCO_AUDIO_STATE_CONNECTED, then
* we assume that a headset is connected.
*
* @return false if device does not support bluetooth or current platform does not supports
* use of SCO for off call.
*/
@SuppressWarnings("deprecation")
private boolean startBluetooth()
{
Log.d(TAG, "startBluetooth"); //$NON-NLS-1$
// Device support bluetooth
if (mBluetoothAdapter != null)
{
if (mAudioManager.isBluetoothScoAvailableOffCall())
{
mContext.registerReceiver(mBroadcastReceiver,
new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED));
mContext.registerReceiver(mBroadcastReceiver,
new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED));
mContext.registerReceiver(mBroadcastReceiver,
new IntentFilter(AudioManager.ACTION_SCO_AUDIO_STATE_CHANGED));
// Need to set audio mode to MODE_IN_CALL for call to startBluetoothSco() to succeed.
mAudioManager.setMode(AudioManager.MODE_IN_CALL);
mIsCountDownOn = true;
// mCountDown repeatedly tries to start bluetooth Sco audio connection.
mCountDown.start();
// need for audio sco, see mBroadcastReceiver
mIsStarting = true;
return true;
}
}
return false;
}
/**
* Register a headset profile listener
* @return false if device does not support bluetooth or current platform does not supports
* use of SCO for off call or error in getting profile proxy.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private boolean startBluetooth11()
{
Log.d(TAG, "startBluetooth11"); //$NON-NLS-1$
// Device support bluetooth
if (mBluetoothAdapter != null)
{
if (mAudioManager.isBluetoothScoAvailableOffCall())
{
// All the detection and audio connection are done in mHeadsetProfileListener
if (mBluetoothAdapter.getProfileProxy(mContext,
mHeadsetProfileListener,
BluetoothProfile.HEADSET))
{
return true;
}
}
}
return false;
}
/**
* API < 11
* Unregister broadcast receivers and stop Sco audio connection
* and cancel count down.
*/
private void stopBluetooth()
{
Log.d(TAG, "stopBluetooth"); //$NON-NLS-1$
if (mIsCountDownOn)
{
mIsCountDownOn = false;
mCountDown.cancel();
}
// Need to stop Sco audio connection here when the app
// change orientation or close with headset still turns on.
mContext.unregisterReceiver(mBroadcastReceiver);
mAudioManager.stopBluetoothSco();
mAudioManager.setMode(AudioManager.MODE_NORMAL);
}
/**
* API >= 11
* Unregister broadcast receivers and stop Sco audio connection
* and cancel count down.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
protected void stopBluetooth11()
{
Log.d(TAG, "stopBluetooth11"); //$NON-NLS-1$
if (mIsCountDownOn)
{
mIsCountDownOn = false;
mCountDown11.cancel();
}
if (mBluetoothHeadset != null)
{
// Need to call stopVoiceRecognition here when the app
// change orientation or close with headset still turns on.
mBluetoothHeadset.stopVoiceRecognition(mConnectedHeadset);
mContext.unregisterReceiver(mHeadsetBroadcastReceiver);
mBluetoothAdapter.closeProfileProxy(BluetoothProfile.HEADSET, mBluetoothHeadset);
mBluetoothHeadset = null;
}
}
/**
* Broadcast receiver for API < 11
* Handle headset and Sco audio connection states.
*/
private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver()
{
@SuppressWarnings({"deprecation", "synthetic-access"})
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (action.equals(BluetoothDevice.ACTION_ACL_CONNECTED))
{
mConnectedHeadset = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
BluetoothClass bluetoothClass = mConnectedHeadset.getBluetoothClass();
if (bluetoothClass != null)
{
// Check if device is a headset. Besides the 2 below, are there other
// device classes also qualified as headset?
int deviceClass = bluetoothClass.getDeviceClass();
if (deviceClass == BluetoothClass.Device.AUDIO_VIDEO_HANDSFREE
|| deviceClass == BluetoothClass.Device.AUDIO_VIDEO_WEARABLE_HEADSET)
{
// start bluetooth Sco audio connection.
// Calling startBluetoothSco() always returns faIL here,
// that why a count down timer is implemented to call
// startBluetoothSco() in the onTick.
mAudioManager.setMode(AudioManager.MODE_IN_CALL);
mIsCountDownOn = true;
mCountDown.start();
// override this if you want to do other thing when the device is connected.
onHeadsetConnected();
}
}
Log.d(TAG, mConnectedHeadset.getName() + " connected"); //$NON-NLS-1$
}
else if (action.equals(BluetoothDevice.ACTION_ACL_DISCONNECTED))
{
Log.d(TAG, "Headset disconnected"); //$NON-NLS-1$
if (mIsCountDownOn)
{
mIsCountDownOn = false;
mCountDown.cancel();
}
mAudioManager.setMode(AudioManager.MODE_NORMAL);
// override this if you want to do other thing when the device is disconnected.
onHeadsetDisconnected();
}
else if (action.equals(AudioManager.ACTION_SCO_AUDIO_STATE_CHANGED))
{
int state = intent.getIntExtra(AudioManager.EXTRA_SCO_AUDIO_STATE,
AudioManager.SCO_AUDIO_STATE_ERROR);
if (state == AudioManager.SCO_AUDIO_STATE_CONNECTED)
{
mIsOnHeadsetSco = true;
if (mIsStarting)
{
// When the device is connected before the application starts,
// ACTION_ACL_CONNECTED will not be received, so call onHeadsetConnected here
mIsStarting = false;
onHeadsetConnected();
}
if (mIsCountDownOn)
{
mIsCountDownOn = false;
mCountDown.cancel();
}
// override this if you want to do other thing when Sco audio is connected.
onScoAudioConnected();
Log.d(TAG, "Sco connected"); //$NON-NLS-1$
}
else if (state == AudioManager.SCO_AUDIO_STATE_DISCONNECTED)
{
Log.d(TAG, "Sco disconnected"); //$NON-NLS-1$
// Always receive SCO_AUDIO_STATE_DISCONNECTED on call to startBluetooth()
// which at that stage we do not want to do anything. Thus the if condition.
if (!mIsStarting)
{
mIsOnHeadsetSco = false;
// Need to call stopBluetoothSco(), otherwise startBluetoothSco()
// will not be successful.
mAudioManager.stopBluetoothSco();
// override this if you want to do other thing when Sco audio is disconnected.
onScoAudioDisconnected();
}
}
}
}
};
/**
* API < 11
* Try to connect to audio headset in onTick.
*/
private CountDownTimer mCountDown = new CountDownTimer(10000, 1000)
{
@SuppressWarnings("synthetic-access")
@Override
public void onTick(long millisUntilFinished)
{
// When this call is successful, this count down timer will be canceled.
mAudioManager.startBluetoothSco();
Log.d(TAG, "\nonTick start bluetooth Sco"); //$NON-NLS-1$
}
@SuppressWarnings("synthetic-access")
@Override
public void onFinish()
{
// Calls to startBluetoothSco() in onStick are not successful.
// Should implement something to inform user of this failure
mIsCountDownOn = false;
mAudioManager.setMode(AudioManager.MODE_NORMAL);
Log.d(TAG, "\nonFinish fail to connect to headset audio"); //$NON-NLS-1$
}
};
/**
* API >= 11
* Check for already connected headset and if so start audio connection.
* Register for broadcast of headset and Sco audio connection states.
*/
private BluetoothProfile.ServiceListener mHeadsetProfileListener = new BluetoothProfile.ServiceListener()
{
/**
* This method is never called, even when we closeProfileProxy on onPause.
* When or will it ever be called???
*/
@Override
public void onServiceDisconnected(int profile)
{
Log.d(TAG, "Profile listener onServiceDisconnected"); //$NON-NLS-1$
stopBluetooth11();
}
@SuppressWarnings("synthetic-access")
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
public void onServiceConnected(int profile, BluetoothProfile proxy)
{
Log.d(TAG, "Profile listener onServiceConnected"); //$NON-NLS-1$
// mBluetoothHeadset is just a headset profile,
// it does not represent a headset device.
mBluetoothHeadset = (BluetoothHeadset) proxy;
// If a headset is connected before this application starts,
// ACTION_CONNECTION_STATE_CHANGED will not be broadcast.
// So we need to check for already connected headset.
List<BluetoothDevice> devices = mBluetoothHeadset.getConnectedDevices();
if (devices.size() > 0)
{
// Only one headset can be connected at a time,
// so the connected headset is at index 0.
mConnectedHeadset = devices.get(0);
onHeadsetConnected();
// Should not need count down timer, but just in case.
// See comment below in mHeadsetBroadcastReceiver onReceive()
mIsCountDownOn = true;
mCountDown11.start();
Log.d(TAG, "Start count down"); //$NON-NLS-1$
}
// During the active life time of the app, a user may turn on and off the headset.
// So register for broadcast of connection states.
mContext.registerReceiver(mHeadsetBroadcastReceiver,
new IntentFilter(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED));
// Calling startVoiceRecognition does not result in immediate audio connection.
// So register for broadcast of audio connection states. This broadcast will
// only be sent if startVoiceRecognition returns true.
mContext.registerReceiver(mHeadsetBroadcastReceiver,
new IntentFilter(BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED));
}
};
/**
* API >= 11
* Handle headset and Sco audio connection states.
*/
private BroadcastReceiver mHeadsetBroadcastReceiver = new BroadcastReceiver()
{
@SuppressWarnings("synthetic-access")
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
int state;
if (action.equals(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED))
{
state = intent.getIntExtra(BluetoothHeadset.EXTRA_STATE,
BluetoothHeadset.STATE_DISCONNECTED);
Log.d(TAG, "\nAction = " + action + "\nState = " + state); //$NON-NLS-1$ //$NON-NLS-2$
if (state == BluetoothHeadset.STATE_CONNECTED)
{
mConnectedHeadset = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Calling startVoiceRecognition always returns false here,
// that why a count down timer is implemented to call
// startVoiceRecognition in the onTick.
mIsCountDownOn = true;
mCountDown11.start();
// override this if you want to do other thing when the device is connected.
onHeadsetConnected();
Log.d(TAG, "Start count down"); //$NON-NLS-1$
}
else if (state == BluetoothHeadset.STATE_DISCONNECTED)
{
// Calling stopVoiceRecognition always returns false here
// as it should since the headset is no longer connected.
if (mIsCountDownOn)
{
mIsCountDownOn = false;
mCountDown11.cancel();
}
mConnectedHeadset = null;
// override this if you want to do other thing when the device is disconnected.
onHeadsetDisconnected();
Log.d(TAG, "Headset disconnected"); //$NON-NLS-1$
}
}
else // audio
{
state = intent.getIntExtra(BluetoothHeadset.EXTRA_STATE, BluetoothHeadset.STATE_AUDIO_DISCONNECTED);
Log.d(TAG, "\nAction = " + action + "\nState = " + state); //$NON-NLS-1$ //$NON-NLS-2$
if (state == BluetoothHeadset.STATE_AUDIO_CONNECTED)
{
Log.d(TAG, "\nHeadset audio connected"); //$NON-NLS-1$
mIsOnHeadsetSco = true;
if (mIsCountDownOn)
{
mIsCountDownOn = false;
mCountDown11.cancel();
}
// override this if you want to do other thing when headset audio is connected.
onScoAudioConnected();
}
else if (state == BluetoothHeadset.STATE_AUDIO_DISCONNECTED)
{
mIsOnHeadsetSco = false;
// The headset audio is disconnected, but calling
// stopVoiceRecognition always returns true here.
mBluetoothHeadset.stopVoiceRecognition(mConnectedHeadset);
// override this if you want to do other thing when headset audio is disconnected.
onScoAudioDisconnected();
Log.d(TAG, "Headset audio disconnected"); //$NON-NLS-1$
}
}
}
};
/**
* API >= 11
* Try to connect to audio headset in onTick.
*/
private CountDownTimer mCountDown11 = new CountDownTimer(10000, 1000)
{
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@SuppressWarnings("synthetic-access")
@Override
public void onTick(long millisUntilFinished)
{
// First stick calls always returns false. The second stick
// always returns true if the countDownInterval is set to 1000.
// It is somewhere in between 500 to a 1000.
mBluetoothHeadset.startVoiceRecognition(mConnectedHeadset);
Log.d(TAG, "onTick startVoiceRecognition"); //$NON-NLS-1$
}
@SuppressWarnings("synthetic-access")
@Override
public void onFinish()
{
// Calls to startVoiceRecognition in onStick are not successful.
// Should implement something to inform user of this failure
mIsCountDownOn = false;
Log.d(TAG, "\nonFinish fail to connect to headset audio"); //$NON-NLS-1$
}
};
}
（2013年4月30）编辑在必要时改变@TargetApi（Build.VERSION_CODES.HONEYCOMB）。 如果你有问题，java.lang.NoClassDefFoundError的API 8或9，只是删除所有API> = 11码。 该startBluetoothSco（）的作品所有版本的API。
我认为，所有你需要做的就是改变你的应用程序中的音频设置。
当你想接收和耳机通过蓝牙发送的声音，你应该把下面的代码。
AudioManager audioManager;
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
audioManager.startBluetoothSco();
audioManager.setBluetoothScoOn(true);
不要忘了，当你不使用蓝牙恢复通过以下方式在手机上正常设置。
audioManager.setMode(AudioManager.MODE_NORMAL);
audioManager.stopBluetoothSco();
audioManager.setBluetoothScoOn(false);
需要的权限如下：
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
这很简单！
虽然蓝牙耳机配对并连接到手机音频配置文件（HF / HS），只有当有电话打进来，并接受实际的音频连线（SCO）成立。
为了您的VR应用程序接受来自蓝牙耳机语音输入您的应用程序将不得不建立一个SCO对一些VR输入触发耳机，您将需要使用以下- isBluetoothScoAvailableOffCall来检查平台是否支持此功能，然后使用在startBluetoothSco和stopBluetoothSco启动SCO到耳机。
startBluetoothSco需要很长的时间去建立，这是问题，如果你需要使用它的语音控制。
有没有办法使用蓝牙话筒听，然后听完之后关闭它的快捷方式？
如果连接上的全部时间那么它是不可能通过A2DP传输音频。
因此，理想的世界：
通过A2DP音频输出。 当它开始听，它采用蓝牙SCO麦克风。 任何响应再次A2DP。
事实上，如果它已连接 - 可以切换上飞通过改变媒体流调用流？ 如果是这样，有没有明显的延迟？
的还阮做了伟大的工作！
测试他的代码，我已经注意到，在某些情况下stopBluetoothSco（）没有被调用。
我建议在CountDownTimer变化不大：
private CountDownTimer mCountDown11 = new CountDownTimer(10000, 1000)
{
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@SuppressWarnings("synthetic-access")
@Override
public void onTick(long millisUntilFinished)
{
mBluetoothHeadset.startVoiceRecognition(mConnectedHeadset);
Log.d(TAG, "onTick startVoiceRecognition"); //$NON-NLS-1$
}
@SuppressWarnings("synthetic-access")
@Override
public void onFinish()
{
mIsCountDownOn = false;
/* START EDIT: Unregister broadcast receivers and stop Sco audio connection
and cancel count down if fails to connect. */
stopBluetooth11();
/* END EDIT */
Log.d(TAG, "\nonFinish fail to connect to headset audio"); //$NON-NLS-1$
}
};
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