Develop Reference

BluetoothManager getConenctedDevices returns an empty array

I've connected to Xiaomi air buds via bluetooth settings on my phone.
Then, I tried to use getConnectedDevices(BluetoothProfile.GATT_SERVER) and getConnectedDevices(BluetoothProfile.GATT) methods to get a list of connected devices, but in both cases I got an empty array as a result. If I try to use some other profile in getConnectedDevices() I get an exception that says that I'm using a wrong profile.
How can I correctly get a list of currently connected bluetooth devices to my phone.
code example, in onCreate:
mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
List<BluetoothDevice> connectedDevices = mBluetoothManager.getConnectedDevices(BluetoothProfile.GATT_SERVER);
for (BluetoothDevice b :
connectedDevices) {
Log.e(TAG, "onStart: connectedDevice - " + b.toString() );
}

To get a list devices that you connected to ( in the past )
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> pairedList = btAdapter.getBondedDevices();
for (BluetoothDevice pairedDevice : pairedList )
{
Log.d("BT", "pairedDevice.getName(): " + pairedDevice.getName());
Log.d("BT", "pairedDevice.getAddress(): " + pairedDevice.getAddress());
}
To get the device you correctly connected to you will have to use a broadcast receiver like in the following
private final BroadcastReceiver btReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Log.i("Device",device.getName()+ "\n"+ device.getAddress()+"\n"+ device.getBondState());
}
}
};
There's a few more ways to just find out what the state of the connection of the headset as shown here.
if that still not answering your question then I'm sorry I probably misunderstood your question / need.

Get RSSI Value of Android Explicitly Paired Devices

I have paired my device to the Android phone explicitly, via an app. This device is a MI-Band 2, and it is paired using the MI-FIT app. I am currently connecting to bluetooth devices using this code:
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
int rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI, Short.MIN_VALUE);
However, the problem is that if the MI-band is connected via the mi-fit app, I cannot get the RSSI value from the MI-Band.
Is it possible to get the RSSI value of explicitly paired devices in Android? If so, what am I doing wrong?
Thanks
Edit: It seems like I can't get RSSI values of any connected devices. For example, if Android phone A is connected to Android Phone B, then I can't read the RSSI values when trying to read via the above code from Phone A.

If you know for sure the bluetooth name of device to be connected, maybe you can try using BluetoothAdapter.LeScanCallback to get noticed when it's scanned. Or do you really need to tell scanned or connected apart?
BluetoothManager bleManager = (BluetoothManager) getApplicationContext().getSystemService(Context.BLUETOOTH_SERVICE);
BluetoothAdapter bleAdapter = bleManager.getAdapter();
bleAdapter.startLeScan(leScanCallback);// find match device
BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() {
#Override
public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) {
if (device.getName() == null || !device.getName().equals("your bluetooth device name")) {
return;
}
// here you can get rssi of specified bluetooth device if it's available.
// and try to connect it programmatically.
connect(device.getAddress());
}
};

Android Bluetooth connection With MAC Address

Is it possible to create a Bluetooth connection with only a MAC address of the module?
Example of my code
private static String address = "00:15:FF:F2:19:5F";
BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice device = BluetoothAdapter.getRemoteDevice(address);
new ReadBluetoothTask().execute(new Object[] ReadBluetoothTask.test.read, device});
But i think something's wrong with the getRemoteDevice() method.
Thanks

Android: Issue getting Bluetooth name

I have this method to retrieve the Android device bluetooth name:
public String getDeviceName() {
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) return "Unknown device";
String deviceName = mBluetoothAdapter.getName();
return deviceName;
}
It is working properly in most devices, but in a few others I get the device model number, like GT-P1000 (Samsung Galaxy Tab), instead. However, in all devices where I have installed the app, I have changed the device name (Settings -> About device). Any idea? Does this method work whether bluetooth is off?
Thanks!

How to detect hands free garniture on Android 2.2+?

I want to know when user has connected hands free accessories and hasn't blocked calls\sms. Is it possible to know when it is connected via hardware ports or bluetooth?

Try this in your onCreate or onResume.
BluetoothAdapter myLocalAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice garniture;
Set<BluetoothDevice> connectedDevices = myLocalAdapter.getBondedDevices();
for (BluetoothDevice device : connectedDevices){
String name = device.getName();
//... check for the name you want
if( name.equals("whatnameisit"){
garniture = device
}
}
if (garniture != null){
// yay we found it, lets do our work with the device here
}