Android : Prevent "Complete Action Using" dialog from appearing after pressing on Android search button

I have created a Phonegap application for an embedded device, and created a plugin to invoke the device scanner when the user presses the hardware search button.

When the device successfully decodes a barcode it broadcasts an intent containing the barcode. I then grab the barcode and process it as appropriate.

This all works well, but for reason when it decodes a barcode beginning with the letter 'B' it launches the browser, and if the barcode begins with a letter 'E' it opens the Complete Action Using dialog giving the user the option to choose from Email and Gmail (this is because I had not selected a default emailing app).

What I would like to know is, why is this behavior happening and how can I prevent it from happening that the event remains within my application?

Here is my broadcast receiver:

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ScannerAction);
scannerReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        receivedBarcode(intent);
    }
};
this.cordova.getActivity().registerReceiver(scannerReceiver, intentFilter);

Here is where I add a listener for the search button press:

private void bindKeyEvents(){
    final Context context = this.cordova.getActivity();
    this.webView.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_SEARCH) {
                if (event.getAction() == KeyEvent.ACTION_UP){
                    if (isPressed){
                        //Engage Scanner
                        Log.w("testApp", "Release");
                        isPressed = false;
                    }
                    return true;
                }
                if (event.getAction() == KeyEvent.ACTION_DOWN && event.isLongPress()){
                    Log.w("testApp", "Long Press");
                    return true;
                }
                if (event.getAction() == KeyEvent.ACTION_DOWN){
                    event.startTracking();
                    if (!isPressed){
                        //Disengage Scanner
                        Log.w("testApp", "Press");
                        isPressed = true;
                    }
                    return true;
                }
                return true;
            }
            else{
                return false;
            }
        }
    }); 
}