Android check if Bluetooth connected

Question

I am searching for this on the internet for quite a while, but I can't find what I am looking for.

How can I find out with my app, if my device is already connected to a Bluetooth device (/ was before I start my app).

I was hoping there was something like bool BluetoothAdapter.isPaired();

Possible duplicate of [How to programmatically tell if a Bluetooth device is connected? (Android 2.2)](http://stackoverflow.com/questions/4715865/how-to-programmatically-tell-if-a-bluetooth-device-is-connected-android-2-2) — Strider, Jun 27 '16 at 09:44
Duplicate question : check this answer here, : http://stackoverflow.com/a/4716715/5476209 — TapanHP, Jun 27 '16 at 10:08

score 1 · Answer 1 · answered Dec 13 '17 at 23:35

If you are only interested if a connection to an arbitrary bluetooth device is established you can use the BluetoothAdapter.getProfileConnectionState(profile):

    adapter = BluetoothAdapter.getDefaultAdapter();
    if (adapter != null && adapter.isEnabled()) {
        int[] profiles = {BluetoothProfile.A2DP, BluetoothProfile.HEADSET, BluetoothProfile.HEALTH};
        boolean connectionExists = false;
        for (int profileId : profiles) {
            if (BluetoothAdapter.getProfileConnectionState(profileId) == 
                                    BluetoothProfile.STATE_CONNECTED) {
                connectionExists = true;
                break;
            }
        }
    }

Thanks Crispert - this was really helpful thank you! It was especially helpful because it covers scenarios when devices with different `BluetoothProfile`s are connected — Tom Larcher, Oct 04 '19 at 01:44

score 0 · Answer 2 · edited May 23 '17 at 10:28

0

There is no way to retrieve a list of connected devices at application startup. The Bluetooth API does not allow you to QUERY, instead it allows you to listen to CHANGES.

(s. This question)

edited May 23 '17 at 10:28

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answered Jun 27 '16 at 11:33

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Android check if Bluetooth connected

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