Question

如何从我的Android应用程序连接到蓝牙耳机？我发现了很多关于发现蓝牙设备和配对的教程，很少有关于连接的内容。

Answer 1

首先，您需要确保蓝牙已启用，然后搜索不成对设备，然后使用设备地址，您将设备配对。

成功配对后，您需要连接到设备以及HSP或HFP配置文件。请注意，如果没有HSP（耳机配置文件）或HFP（免提配置文件），您将无法连接并将呼叫转接到耳机或扬声器。

我制定了步骤，您可以通过Google搜索每一步轻松找到更多详细信息。希望这会对你有所帮助。

<强>更新

我会尽力帮助你：你必须在“src”文件夹下添加一个名为android.bluetooth的新软件包然后创建IBluetoothHeadset.aidl

使用以下代码：

package android.bluetooth;

import android.bluetooth.BluetoothDevice;
interface IBluetoothHeadset {

// Public API
boolean connect(in BluetoothDevice device); //Api 11 and above
boolean connectHeadset(in BluetoothDevice device); // Below Api 11

boolean disconnect(in BluetoothDevice device);
boolean disconnectHeadset(in BluetoothDevice device);

List<BluetoothDevice> getConnectedDevices();
List<BluetoothDevice> getDevicesMatchingConnectionStates(in int[] states);
int getConnectionState(in BluetoothDevice device);
int getState(in BluetoothDevice device);
boolean setPriority(in BluetoothDevice device, int priority);
int getPriority(in BluetoothDevice device);
boolean startVoiceRecognition(in BluetoothDevice device);
boolean stopVoiceRecognition(in BluetoothDevice device);
boolean isAudioConnected(in BluetoothDevice device);
boolean sendVendorSpecificResultCode(in BluetoothDevice device,
                                     in String command,
                                     in String arg);

// APIs that can be made public in future
int getBatteryUsageHint(in BluetoothDevice device);

// Internal functions, not be made public
boolean acceptIncomingConnect(in BluetoothDevice device);
boolean rejectIncomingConnect(in BluetoothDevice device);
int getAudioState(in BluetoothDevice device);

boolean isAudioOn();
boolean connectAudio();
boolean disconnectAudio();
boolean startScoUsingVirtualVoiceCall(in BluetoothDevice device);
boolean stopScoUsingVirtualVoiceCall(in BluetoothDevice device);
void phoneStateChanged(int numActive, int numHeld, int callState, String number, int type);
void clccResponse(int index, int direction, int status, int mode, boolean mpty,
                  String number, int type);

}

然后在您的活动中

     BluetoothDevice DeviceToConnect;
     IBluetoothHeadset ibth; 
     //IBluetoothHeadset instance used to connect and disconnect headset afterwards

     // Create and Register BroadCastListener for Action "HEADSET_INTERFACE_CONNECTED"
     // In Broadcast your code has to be something like that
     // if(ibth != null) ibth.connect(DeviceToConnect);


     //Then After Pairing DeviceToConnect;
     Intent i = new Intent(IBluetoothHeadset.class.getName());

    if (bindService(i, HSPConnection, Context.BIND_AUTO_CREATE)) {

    } else {
       Log.e("HSP FAILED", "Could not bind to Bluetooth HFP Service");
   }


      //Method for bind
  public static ServiceConnection HSPConnection= new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            ibth = IBluetoothHeadset.Stub.asInterface(service);
            //ibth instance used to connect and disconnect headset afterwards
            Intent intent = new Intent();
            intent.setAction("HEADSET_INTERFACE_CONNECTED");
            //same as the one we register earlier for broadcastreciever
                            ctx.sendBroadcast(intent);
            //ctx is Instance of Context
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            ibth=null;
        }

    };

更新2：

<intent-filter> 
  <action android:name="android.bluetooth.device.action.ACL_CONNECTED" />
  <action android:name="android.bluetooth.device.action.ACL_DISCONNECT_REQUESTED" />
  <action android:name="android.bluetooth.device.action.ACL_DISCONNECTED" />
</intent-filter>

这些是您必须添加到广播接收器的过滤器。

连接蓝牙并且ACL_DISCONNECTED信号蓝牙断开连接时发出ACL_CONNECTED信号

对于特定设备，您必须检查广播接收器中的意图/上下文

所以你的新接收器包括之前的看起来会是这样的：

 BroadcastReceiver bcr = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
           //Device found
        }
        else if (BluetoothAdapter.ACTION_ACL_CONNECTED.equals(action)) {
           //Device is now connected
        }
        else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
            //Done searching
        }
        else if (BluetoothAdapter.ACTION_ACL_DISCONNECT_REQUESTED.equals(action)) {
           //Device is about to disconnect
        }
        else if (BluetoothAdapter.ACTION_ACL_DISCONNECTED.equals(action)) {
           //Device has disconnected add whatever way u want to be notified here
           //e.g music-vibration-screen light
        }else if("HEADSET_INTERFACE_CONNECTED".equals(action){
           if(ibth != null) ibth.connect(DeviceToConnect);
        }
    }
};

我忘了添加你在Manifest中需要这两个权限：

<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH" />

从Android应用程序以编程方式连接到蓝牙耳机

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