How to registerReceiver in Fragment

Question

I show Bluetooth devices in a ListView. I tried it in an Activity before and it worked, but now I have to include this ListView in a Fragment

It´s clear that one or two things don´t belong here, like the registerReceiver, unregisterReceiver and RESULT_CANCELED.

protected void onResume() {
    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
    registerReceiver(receiver, filter);
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    unregisterReceiver(receiver);


}

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode == RESULT_CANCELED){
            Toast.makeText(getActivity()     , "El Bluetooth debe estar activado para continuar", Toast.LENGTH_SHORT).show();
            getActivity().finish();
        }
    }

The lines that start with registerReceiver, unegisterReceiver and if(resultCode==RESULT_CANCELED){ are giving me problems.

As an aditional fact, I have tried to to change it to an Activity instead of a Fragment, but my Main class have an error with that because I am working with Fragments.

Answer 1

All these methods and variables belong to Activity class. So consider calling them with context of parent Activity of Fragment.

You may call required methods as:

 requireActivity().registerReceiver(receiver, filter);

and

 requireActivity().unregisterReceiver(receiver);

---

if(resultCode==RESULT_CANCELED){

can be replaced with

if(resultCode == Activity.RESULT_CANCELED){

Hope this solve your problem.