List(string, string) not resolvable in Android studio

I’m having trouble calling a function from an android app.
I can’t figure out how to give arguments to callFunction. The result code is always 0 from android. I have a test println in the function that shows up on the serial monitor when called from the console.
I can log in, retrieve a list of functions, and get variable values without any issues. When I call the function from the console, the correct values show up in my app as variables when retrieved, I just need to be able to call my function from the app first instead of the console obviously.

    public void getLocationString(View view) {
        int resultCode = 0;
        List<String> argument = new ArrayList<String>();
        argument.add("get");
        Toaster.s(MapsMarkerActivity.this, "Calling getCoords");
        try {
            mDevice.callFunction("getCoords");
            resultCode = mDevice.callFunction("getCoords", argument);
        } catch (ParticleDevice.FunctionDoesNotExistException | ParticleCloudException | IOException e) {
            e.printStackTrace();
        }
        Toaster.s(MapsMarkerActivity.this, "Result of calling getCoords: " + resultCode);
    }

the example doesn’t work for passing arguments, since list(“D7”, “1”) cannot be resolved, which is available in java 9 but java 9 won’t work in android studio. I can’t register a function to the cloud without the string argument, which I don’t even really need anyway. I have tried using argument.get(0), but it doesn’t work either. I’ve been searching the forums here, but can’t figure out how others got list(string, string) to work as a parameter. The getLocationString function is an onClick function that is invoked correctly from my app, it just gets lost somewhere on it’s way to or from my electron. The electron function:

int getGPSData(String command) {
  if(command == "get"){
  Serial.println("Called");
    latitude = myGPS.getLatitude();// / 10000000.0;
    //Serial.println(latitude);

    longitude = myGPS.getLongitude();// / 10000000.0;
    //Serial.println(longitude);

    spd = myGPS.getGroundSpeed() / 278;

    latString = "";
    lonString = "";
    spdString = "";
    locString = "";

    latString += String(latitude / 10000000.0);// + ".";
    //if (latitude < 0) {
    //  latString += String((latitude * -1) % 10000000);
    //}
    //else {
    //  latString += String(latitude % 10000000);
    //}

    lonString += String(longitude / 10000000.0);// + ".";
    //if (longitude < 0) {
    //  lonString += String((longitude * -1) % 10000000);
    //}
    //else {
    //  lonString += String(longitude % 10000000);
    //}

    spdString += String(spd);
    locString += latString;
    locString += ",";
    locString += lonString;
    return 1;
  }
  else{
    return -1;
    Serial.println("called");
  }
}

Is the example kotlin or java? I’m working in java for my app.
Any advice?

I figured it out. I thought the onCreate Async was all it needed, but changing the entire function to:

public void getLocationString(View view) {
        Async.executeAsync(ParticleCloudSDK.getCloud(), new Async.ApiWork<ParticleCloud, Object>() {
            @Override
            public Object callApi(ParticleCloud particleCloud) throws ParticleCloudException, IOException {
                int resultCode = 0;
                List<String> argument = new ArrayList<String>();
                argument.add("get");
                Toaster.s(MapsMarkerActivity.this, "Calling getCoords");
                try {
                    mDevice.callFunction("getCoords");
                    resultCode = mDevice.callFunction("getCoords", argument);
                } catch (ParticleDevice.FunctionDoesNotExistException | ParticleCloudException | IOException e) {
                    e.printStackTrace();
                }
                Toaster.s(MapsMarkerActivity.this, "Result of calling getCoords: " + resultCode);
                Object obj;
                try {
                    obj = mDevice.getVariable("longitude");
                    Log.d("BANANA", "longitude: " + obj);
                    Toaster.s(MapsMarkerActivity.this, "longitude:" + obj);
                } catch (ParticleDevice.VariableDoesNotExistException | ParticleCloudException | IOException e) {
                    Toaster.s(MapsMarkerActivity.this, "Error reading variable");
                }
                return null;
            }

            @Override
            public void onSuccess(Object o) {

            }

            @Override
            public void onFailure(ParticleCloudException exception) {
            }
        });
    }

fixed the issue. response code is now 1, and the variable is returned properly.

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