将Android识别器与蓝牙耳机配合使用
我使用以下代码在Android中启动语音识别：将Android识别器与蓝牙耳机配合使用,android,bluetooth,speech-recognition,Android,Bluetooth,Speech Recognition,我使用以下代码在Android中启动语音识别： PackageManager pm = getPackageManager(); List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0); if (activities.size() == 0) { displayWarning("This device do
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);
PackageManager pm=getPackageManager（）；
列表活动=pm.QueryInputActivities（新意图（识别者意图.行动\识别\言语），0）；
如果（activities.size（）==0）{
displayWarning（“此设备不支持语音识别”）；
返回；
}
意向意向=新意向（识别意向、行动、识别言语）；
intent.putExtra（RecognizerIntent.EXTRA语言模型，RecognizerIntent.LANGUAGE模型自由形式）；
startActivityForResult（意图、语音识别、请求、代码）；
我是否必须在AudioManager中四处走动（就像我假设SoundAbout正在做的那样）以使用（）或（）路由音频输入 即使蓝牙耳机已配对并连接到手机音频模式（HF/HS），但实际音频连接（SCO）仅在来电并被接听时建立 为了让您的VR应用程序接受蓝牙耳机的语音输入，您的应用程序必须在某些VR输入触发器上建立与耳机的SCO， 您需要使用以下各项： 要检查平台是否支持此功能，请使用 和stopBluetoothSco启动耳机的SCO。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" />
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);
}
protectedvoid speak（字符串文本）
{
HashMap myHashRender=新建HashMap（）；
if（mBluetoothHelper.isOnHeadsetSco（））
{
myHashRender.put（TextToSpeech.Engine.KEY_PARAM_流，
String.valueOf（AudioManager.STREAM_VOICE_CALL））；
}
mTts.speak（text，TextToSpeech.QUEUE\u FLUSH，myHashRender）；
}
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"); //$NON-NLS-1$
}
};
}
import java.util.List；
导入android.annotation.SuppressLint；
导入android.bluetooth.BluetoothAdapter；
导入android.bluetooth.BluetoothClass；
导入android.bluetooth.bluetooth设备；
导入android.bluetooth.bluetooth耳机；
导入android.bluetooth.BluetoothProfile；
导入android.content.BroadcastReceiver；
导入android.content.Context；
导入android.content.Intent；
导入android.content.IntentFilter；
导入android.media.AudioManager；
导入android.os.Build；
导入android.os.CountDownTimer；
导入android.util.Log；
/**
*此实用程序用于检测蓝牙耳机连接并建立音频连接
*对于android API>=8。这包括API<11检测已连接耳机的解决方案
*在应用程序启动之前。这种解决方法只有在Sco音频的情况下才会失败
*已接受连接，但连接的设备不是耳机。
*
*@作者Hoan Nguyen
*
*/
公共抽象类BluetoothHeadsetUtils
{
私有上下文；
私人蓝牙适配器mBluetoothAdapter；
私人蓝牙耳机；
私人蓝牙设备mConnectedHeadset；
私人音频经理；
私有布尔错误计数；
私有布尔错误启动；
私有布尔mIsOnHeadsetSco；
私有布尔值启动错误；
私有静态最终字符串TAG=“BluetoothHeadsetUtils”//$NON-NLS-1$
/**
*建造师
*@param上下文
*/
公共BluetoothHeadsetUtils（上下文）
{
mContext=上下文；
mBluetoothAdapter=BluetoothAdapter.getDefaultAdapter（）；
mAudioManager=（AudioManager）mContext.getSystemService（Context.AUDIO\u服务）；
}
/**
*调用此项启动BluetoothHeadsetUtils功能。
*@返回startBluetooth（）或startBluetooth 11（）的返回值
*/
公共布尔起始（）
{
如果（！启动错误）
{
错误开始=正确；
if（Build.VERSION.SDK\u INTimport 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"); //$NON-NLS-1$
}
};
}
AudioManager audioManager;
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
audioManager.startBluetoothSco();
audioManager.setBluetoothScoOn(true);
audioManager.setMode(AudioManager.MODE_NORMAL);
audioManager.stopBluetoothSco();
audioManager.setBluetoothScoOn(false);
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
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"); //$NON-NLS-1$
}
};
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BROADCAST_STICKY" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
public class BTReceiver extends BroadcastReceiver {
private static final String TAG = "BTReceiver";
int state = 0;
AudioManager audioManager;
@Override
public void onReceive(Context context, Intent intent) {
Log.d("Z", "Received: Bluetooth");
try {
Bundle extras = intent.getExtras();
if (extras != null) { //Do something
audioManager = (AudioManager) context.getSystemService(AUDIO_SERVICE);
String action = intent.getAction();
Toast.makeText(context, action, Toast.LENGTH_LONG).show();
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) {
setModeBluetooth();
} else if (state == BluetoothHeadset.STATE_DISCONNECTED) {
// Calling stopVoiceRecognition always returns false here
// as it should since the headset is no longer connected.
setModeNormal();
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"); //$NON-NLS-1$
setModeBluetooth();
} else if (state == BluetoothHeadset.STATE_AUDIO_DISCONNECTED) {
setModeNormal();
Log.d(TAG, "Headset audio disconnected"); //$NON-NLS-1$
}
}
}
} catch (Exception e) {
Log.d("Exception", "Exception " + e.toString());
}
}
private void setModeBluetooth() {
try {
audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
audioManager.startBluetoothSco();
audioManager.setBluetoothScoOn(true);
} catch (Exception e) {
e.printStackTrace();
}
}
private void setModeNormal() {
try {
audioManager.setMode(AudioManager.MODE_NORMAL);
audioManager.stopBluetoothSco();
audioManager.setBluetoothScoOn(false);
} catch (Exception e) {
e.printStackTrace();
}
}
}
<receiver
android:name=".speech.BTReceiver"
android:enabled="true"
android:permission="android.permission.BLUETOOTH">
<intent-filter>
<action android:name="android.bluetooth.adapter.action.CONNECTION_STATE_CHANGED" />
</intent-filter>
</receiver>
mHeadsetBroadcastReceiver = new BTReceiver();
@Override
protected void onResume() {
super.onResume();
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.
registerReceiver(mHeadsetBroadcastReceiver,
new IntentFilter(BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED));
}
@Override
protected void onPause() {
unregisterReceiver(mHeadsetBroadcastReceiver);
super.onPause();
}