Android Connect Bluetooth device automatically after pairing programmatically

Question

In my app I need pairing bluetooth device and immediately connect with it. I have the following function in order to pairing devices: ``` public boolean createBond(BluetoothDevice btDevice) { try { Log.d("pairDevice()", "Start Pairing..."); Method m = btDevice.getClass().getMethod("createBond", (Class[]) null); Boolean returnValue = (Boolean) m.invoke(btDevice, (Object[]) null); Log.d("pairDevice()", "Pairing finished."); return returnValue; } catch (Exception e) { Log.e("pairDevice()", e.getMessage()); } return false; } ``` And I use it as the following way: ``` Boolean isBonded = false; try { isBonded = createBond(bdDevice); if(isBonded) { //Connect with device } } ``` And it show me the dialog to pairing devices and enter the pin. The problem is that createBond functions always return true, and it doen's wait until I enter the pin and paired with device, so I don't use correctly: ``` isBonded = createBond(bdDevice); if(isBonded) {...} ``` So the question is How can I paired with de…

Accepted Answer

I found the solution.

First I need a `BroadcastReceiver` like:

```
private BroadcastReceiver myReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
                // CONNECT
            }
        } else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            // Discover new device
        }
    }
};
```

And then I need register the receiver as follow:

```
IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
context.registerReceiver(myReceiver, intentFilter);
```

In this way the receiver is listening for `ACTION_FOUND` (Discover new device) and `ACTION_BOND_STATE_CHANGED` (Device change its bond state), then I check if the new state is `BOND_BOUNDED` and if it is I connect with device.

Now when I call `createBond` Method (described in the question) and enter the pin, `ACTION_BOND_STATE_CHANGED` will fire and `device.getBondState() == BluetoothDevice.BOND_BONDED` will be `True` and it will connect.

Android Connect Bluetooth device automatically after pairing programmatically

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