Activate bluetooth headset automatically when making a call on android

Question

My App is making a call:

Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + number));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setClassName("com.android.phone", "com.android.phone.OutgoingCallBroadcaster");
startActivity(intent);

This work fine, call starts.

For real headsets, it is ok, call starts on the headset, but for "headset-like" devices, like a smart watch (which behaves like a BT headset, and can take over the call), the call starts on the phone, and user has to press the "Headset" button manually on the call screen to move to call to the smart watch. However, I want the phone to make the call always via the headset automatically. Or that is also ok, if headset mode is toggled after call has been started (within 1-2 sec), if not possible to start immediately via the headset.

Anyone has any idea?

** UPDATE **

In a Call Broadcast Receiver, I tried (of course with all necessary permissions):

AudioManager audioManager;
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
audioManager.setMode(AudioManager.MODE_IN_CALL);

• audioManager.setSpeakerphoneOn(false) -> works, switches off the Speaker during the call (if it was on)
• audioManager.setSpeakerphoneOn(true) -> works, switches on the Speaker during the call (if it was off)
• audioManager.setBluetoothScoOn(false) -> works, switches off the BT headset during the call (if it was on)
• audioManager.setBluetoothScoOn(true) -> DOES NOT work, does not switch on the BT headset during the call (if it is off)

I found this in the Android AudioManager::startBluetoothSco doc:

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.

Strange...

Thank you.

Answer 1

Try to use Broadcase Receiver of call start send a broadcast and switch call to headset mode.

use following action in broadcast receiver.

for outgoing call - android.intent.action.NEW_OUTGOING_CALL

for incoming call - android.intent.action.PHONE_STATE In the you can use different states like "phone ringing","phone pickup" and etc, similar like this you can check for condition and do the appropriate code as you want in receiver method of broadcast receiver.

For transfring the call to bluetooth :

TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
if (telephonyManager != null) {
    telephonyManager.listen(phoneStateListener,
            PhoneStateListener.LISTEN_CALL_STATE);
}
  audioManager.setBluetoothScoOn(true);
  audioManager.startBluetoothSco();