Q:

This IP, site or mobile application is not authorized to use this API key. in android google maps

I got a poly line between two locations using google maps and when i want to get routes and directions between those two locations by using this URL using Json parsing
https://maps.googleapis.com/maps/api/directions/json?origin=fromlocation&destination=destinationlocation&sensor=false&key=********API KEY********* 
it is getting the json parsing as 
{
   "error_message" : "This IP, site or mobile application is not authorized to use this API key.",
   "routes" : [],
   "status" : "REQUEST_DENIED"
}
I have got the authorized APIKEY using keytool and with package name and finger print key
here is the code what i have done thanks  in advance and  sorry for my english...
private class GetContacts extends AsyncTask {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Showing progress dialog
        pDialog = new ProgressDialog(DirectionActivity2.this);
        pDialog.setMessage("Please wait...");
        pDialog.setCancelable(true);
        pDialog.show();

    }
@Override
protected Void doInBackground(Void... arg0) {

    String URL="https://maps.googleapis.com/maps/api/directions/json?origin=start&destination=end&sensor=false&key=****API KEY*****";
ServiceHandler sh = new ServiceHandler();

// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(URL, ServiceHandler.GET);

Log.d("Response: ", "> " + jsonStr);
return null;
}

@Override
protected void onPostExecute(Void result) {
    super.onPostExecute(result);
    // Dismiss the progress dialog
    if (pDialog.isShowing())
        pDialog.dismiss();

}

}

A:

Update June 28 2019:
Previously, google used to allow calling directions, geo-location api's without an api key up to a certain extent. It was a handy feature for development as you could just change the url in the browser. They have updated their policy. 
Now you will need to provide a valid api key. More information in following link.
Previous Answer:
Try removing the API key. I used this and it is returning me a valid json.

