Android实现主动连接蓝牙耳机

在Android程序中可以实现自动扫描蓝牙、配对蓝牙、建立数据通道。

可以入下面方法获取蓝牙设备支持的类型：

BluetoothDevice device;
Arrays.toString(device.getUuids());

我的蓝牙音箱支持的类型有：

0000111e-0000-1000-8000-00805f9b34fb：Handsfree
0000110b-0000-1000-8000-00805f9b34fb：AudioSink
0000110e-0000-1000-8000-00805f9b34fb：AVRemoteControl
00001203-0000-1000-8000-00805f9b34fb：GenericFileTransfer

这篇文字只讨论如何与蓝牙耳机（蓝牙音箱）连接。

所以下面操作要同时操作A2DP和HFP，两个都连接成功，才算连接成功；

一、A2DP的操作可以分三步：

1、扫描蓝牙设备：

注册并监听广播：

BluetoothAdapter.ACTION_DISCOVERY_STARTED
BluetoothDevice.ACTION_FOUND
BluetoothAdapter.ACTION_DISCOVERY_FINISHED

启动扫描：

BluetoothAdapter.getDefaultAdapter().startDiscovery();

对扫描的结果按类型进行筛选，只保留我们需要的蓝牙耳机：

if(device.getBluetoothClass().getDeviceClass() == BluetoothClass.Device.AUDIO_VIDEO_WEARABLE_HEADSET
				|| device.getBluetoothClass().getDeviceClass() == BluetoothClass.Device.AUDIO_VIDEO_HANDSFREE){
//蓝牙耳机
}

2、配对指定的蓝牙设备：

这个跟配对普通蓝牙一样，方法如下：

public static  boolean createBond(BluetoothDevice btDevice){
		boolean result = false;
		try{
			Method m = btDevice.getClass().getDeclaredMethod("createBond",new Class[]{});
			m.setAccessible(true);
			Boolean originalResult = (Boolean) m.invoke(btDevice);
			result = originalResult.booleanValue();
		}catch(Exception ex){
		}
		return result;
	}

等配对完成之后就是要建立数据连接；

3、建立数据连接：

ifyouSDKbetween11and16.calla2dp.connectSink(btDevice)ora2dp.connect(btDevice)

private static IBluetoothA2dp getIBluetoothA2dp() {
    IBluetoothA2dp ibta = null;

    try {
        final Class serviceManager = Class.forName("android.os.ServiceManager");
        final Method getService = serviceManager.getDeclaredMethod("getService", String.class);
        final IBinder iBinder = (IBinder) getService.invoke(null, "bluetooth_a2dp");
        final Class iBluetoothA2dp = Class.forName("android.bluetooth.IBluetoothA2dp");
        final Class[] declaredClasses = iBluetoothA2dp.getDeclaredClasses();
        final Class c = declaredClasses[0];
        final Method asInterface = c.getDeclaredMethod("asInterface", IBinder.class);

        asInterface.setAccessible(true);
        ibta = (IBluetoothA2dp) asInterface.invoke(null, iBinder);
    } catch (final Exception e) {
        Log.e("Error " + e.getMessage());
    }
    return ibta;
}

参考：http://stackoverflow.com/questions/8467178/working-around-a2dp-and-hfp-limitations-of-android-pre-honeycomb

如果API大于16需要用如下的方法：

private void initA2dpService(){
//		Intent i = getExplicitIntent(mContext,new Intent(IBluetoothA2dp.class.getName()));//5.0以上系统需要显示intent
//详细参考http://blog.csdn.net/l2show/article/details/47421961
		Intent i = new Intent(IBluetoothA2dp.class.getName());
		boolean success = mContext.bindService(i, mConnection, Context.BIND_AUTO_CREATE);
		if (success) {

		} else {
		}
	}

	public ServiceConnection mConnection = new ServiceConnection() {

		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			try {
				mA2dpService = IBluetoothA2dp.Stub.asInterface(service);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}

		@Override
		public void onServiceDisconnected(ComponentName name) {
			// TODO Auto-generated method stub

		}

	};
	
    public Intent getExplicitIntent(Context context, Intent implicitIntent) {
        // Retrieve all services that can match the given intent
        PackageManager pm = context.getPackageManager();
        List<ResolveInfo> resolveInfo = pm.queryIntentServices(implicitIntent, 0);
        // Make sure only one match was found
        if (resolveInfo == null || resolveInfo.size() != 1) {
            return null;
        }
        // Get component info and create ComponentName
        ResolveInfo serviceInfo = resolveInfo.get(0);
        String packageName = serviceInfo.serviceInfo.packageName;
        String className = serviceInfo.serviceInfo.name;
        ComponentName component = new ComponentName(packageName, className);
        // Create a new intent. Use the old one for extras and such reuse
        Intent explicitIntent = new Intent(implicitIntent);
        // Set the component to be explicit
        explicitIntent.setComponent(component);
        return explicitIntent;
    }

建立连接：mA2dpService.connect(device);

断开连接：mA2dpService.disconnect(device);

参考：http://stackoverflow.com/questions/14705167/how-connect-paired-bluetooth-a2dp-device-on-android-4-2-using-reflection

http://blog.csdn.net/qs_csu/article/details/45114251

二、HFP操作：

下面只针对4.0及以上版本；

1、初始化：

private void initOrCloseBtCheck(boolean init){
		if(init){
			mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
			mBluetoothAdapter.getProfileProxy(mContext, new ServiceListener() {
				public void onServiceConnected(int profile, BluetoothProfile proxy) {
					if (profile == BluetoothProfile.HEADSET) {
						mBluetoothHeadset = (BluetoothHeadset) proxy;
					}
				}

				public void onServiceDisconnected(int profile) {
					if (profile == BluetoothProfile.HEADSET) {
						mBluetoothHeadset = null;
					}
				}
			},BluetoothProfile.HEADSET);
		}else{
			mBluetoothAdapter.closeProfileProxy(BluetoothProfile.HEADSET,mBluetoothHeadset);
		}
	}

建立连接：

Method m = mBluetoothHeadset.getClass().getDeclaredMethod("connect",BluetoothDevice.class);  
					m.setAccessible(true);
					//连接Headset
					boolean successHeadset = (Boolean)m.invoke(mBluetoothHeadset, device);

断开连接：

Method m = mBluetoothHeadset.getClass().getDeclaredMethod("disconnect",BluetoothDevice.class);  
					m.setAccessible(true);
					m.invoke(mBluetoothHeadset, device);

三、状态判断：

蓝牙耳机连接成功：

mA2dpService.getConnectionState(device) == BluetoothA2dp.STATE_DISCONNECTED && mBluetoothHeadset.getConnectionState(device) == BluetoothProfile.STATE_DISCONNECTED

断开成功：

(mA2dpService.getConnectionState(device) == BluetoothA2dp.STATE_CONNECTED || mA2dpService.getConnectionState(device) == BluetoothA2dp.STATE_PLAYING)
								&& mBluetoothHeadset.getConnectionState(device) == BluetoothProfile.STATE_CONNECTED