How To Check Bluetooth Tethering Status Programmatically In Android

Is there any way to find out bluetooth tethering is enabled or disabled programmatically in Android 2.3+(any version after 2.3+)? I am not asking to enable/disable it, but only to

Solution 1:

It turns out that BluetoothPan (Personal Area Networking) is the keyword for tethering. I pored over the API documentation and Android source code, but the brief examples in the comments were misleading. This poster provided an example but I had trouble with it initially: Android BluetoothPAN to create TCP/IP network between Android device and Windows7 PC

I tried various other methods including checking the IP address of the BT device. However no Bluetooth network device exists, so there's no IP to check. Detect USB tethering on android

Back to the BluetoothPan code... The example in the first thread was incomplete (no ServiceListener implementation). I tried a standard one but the isTetheringOn proxy call failed. The crucial piece is that the onServiceConnected() callback needs at least one line of code or the compiler optimizes it away. It also shouldn't disconnect the proxy like most other examples have. Here's the working code:

BluetoothAdaptermBluetoothAdapter=null;
Class<?> classBluetoothPan = null;
Constructor<?> BTPanCtor = null;
ObjectBTSrvInstance=null;
Class<?> noparams[] = {};
Method mIsBTTetheringOn;

@OverridepublicvoidonCreate() {
    ContextMyContext= getApplicationContext();
    mBluetoothAdapter = getBTAdapter();
    try {
        classBluetoothPan = Class.forName("android.bluetooth.BluetoothPan");
        mIsBTTetheringOn = classBluetoothPan.getDeclaredMethod("isTetheringOn", noparams);
        BTPanCtor = classBluetoothPan.getDeclaredConstructor(Context.class, BluetoothProfile.ServiceListener.class);
        BTPanCtor.setAccessible(true);
        BTSrvInstance = BTPanCtor.newInstance(MyContext, newBTPanServiceListener(MyContext));
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private BluetoothAdapter getBTAdapter() {
    if (android.os.Build.VERSION.SDK_INT <= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1)
        return BluetoothAdapter.getDefaultAdapter();
    else {
        BluetoothManagerbm= (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
        return bm.getAdapter();
    }
}

// Check whether Bluetooth tethering is enabled.privatebooleanIsBluetoothTetherEnabled() {
    try {
        if(mBluetoothAdapter != null) {
            return (Boolean) mIsBTTetheringOn.invoke(BTSrvInstance, (Object []) noparams);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    returnfalse;
}

publicclassBTPanServiceListenerimplementsBluetoothProfile.ServiceListener {
    privatefinal Context context;

    publicBTPanServiceListener(final Context context) {
        this.context = context;
    }

    @OverridepublicvoidonServiceConnected(finalint profile,
                                   final BluetoothProfile proxy) {
        //Some code must be here or the compiler will optimize away this callback.
        Log.i("MyApp", "BTPan proxy connected");
    }

    @OverridepublicvoidonServiceDisconnected(finalint profile) {
    }
}