Programmatically connect to a bluetooth headset from an Android application

Question

How to connect to a bluetooth headset from my android app? I found a lot of tutorials on finding and pairing Bluetooth devices and very few when connected.

Answer 1

First of all, you need to make Sure Bluetooth turned on, then search for unpaired devices, and then use the device address. You are connecting a device.

After a successful connection, you will need to connect to the device, as well as to the HSP or HFP profiles. Note without HSP (headset profile) or HFP (Hands-Free profile), you cannot connect and transfer calls to the headset or speaker.

, . , .

UPDATE

: "src" : android.bluetooth IBluetoothHeadset.aidl

:

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);

}

     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;
        }

    };

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>

, .

ACL_CONNECTED Bluetooth ACL_DISCONNECTED Bluetooth

intents/context

, , , :

 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);
        }
    }
};

, 2 :

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