顯示許可

BluetoothHelper extends BluetoothHeadSetUtils在你的Activity或中創建一個內部類Service。聲明一個類成員mBluetoothHelper并將其實例化onCreate()BluetoothHelper?mBluetoothHelper;@Overridepublic?void?onCreate(){

mBluetoothHelper?=?new?BluetoothHelper(this);}??@OverrideonResume(){

mBluetoothHelper.start();}@OverrideonPause(){

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()

{

}}

要將藍牙耳機與文本轉語音一起使用，您需要在調用speak之前將AudioManager設置為STREAM_VOICE_CALL。或者使用下面的代碼protected?void?speak(String?text){

HashMap?myHashRender?=?new?HashMap();

if?(mBluetoothHelper.isOnHeadsetSco())

{

myHashRender.put(TextToSpeech.Engine.KEY_PARAM_STREAM,

String.valueOf(AudioManager.STREAM_VOICE_CALL));

}

mTts.speak(text,?TextToSpeech.QUEUE_FLUSH,?myHashRender);}

將BluetoothHeadsetUtils類復制到您的項目中。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?

*?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?

{

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?

{

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?

*?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?

*?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?

*?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?

*?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?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日)編輯以在必要時更改為@TargetApi(Build.VERSION_CODES.HONEYCOMB)。如果您對API 8或9的java.lang.NoClassDefFoundError有問題，只需刪除所有API> = 11代碼。startBluetoothSco()適用于所有API版本。

總結

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