PUM | Zad 3.1

using Android.App;
using Android.Content;
using Android.Locations;
using Android.OS;
using Android.Widget;
using System;
using System.Collections.Generic;
using System.IO;
using System.Json;
using System.Linq;
using System.Net;
using System.Threading.Tasks;

namespace PUM_ZAD3
{
    [Activity(Label = "PUM_ZAD3", MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity, ILocationListener
    {

        public void OnProviderDisabled(string provider) { }
        public void OnProviderEnabled(string provider) { }
        public void OnStatusChanged(string provider, Availability status, Bundle extras) { }
        private LocationManager _locationManager;

        private string _locationProvider;
        private Location _currentLocation;
        EditText latitude;
        EditText longitude;
        TextView location;
        private bool _found = false;
        private bool _GPSworking = false;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            SetContentView(Resource.Layout.Main);

            location = FindViewById<TextView>(Resource.Id.locationText);
            latitude = FindViewById<EditText>(Resource.Id.latText);
            longitude = FindViewById<EditText>(Resource.Id.longText);
            Button button = FindViewById<Button>(Resource.Id.getWeatherButton);

            InitializeLocationManager();
            button.Click += AddressButton_OnClick;
        }

        protected override void OnResume()
        {
            base.OnResume();
            _GPSworking = _locationManager.IsProviderEnabled(LocationManager.GpsProvider);
            if (_GPSworking)
            {
                InitializeLocationManager();
                _locationManager.RequestLocationUpdates(_locationProvider, 0, 0, this);
            }
            else showGPSDisabledAlertToUser();
        }

        protected override void OnPause()
        {
            base.OnPause();
            _locationManager.RemoveUpdates(this);
        }

        private async Task<JsonValue> FetchWeatherAsync(string url)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(url));
            request.ContentType = "application/json";
            request.Method = "GET";

            using (WebResponse response = await request.GetResponseAsync())
            {
                using (Stream stream = response.GetResponseStream())
                {
                    JsonValue jsonDoc = await Task.Run(() => JsonObject.Load(stream));
                    Console.Out.WriteLine("Response: {0}", jsonDoc.ToString());

                    return jsonDoc;
                }
            }
        }

        public async void OnLocationChanged(Location location)
        {
            _currentLocation = location;
            if (_currentLocation == null)
            {
               Toast.MakeText(this, "Unable to determine your location. Try again in a short while.", ToastLength.Short).Show();
            }
            else
            {
                Address address = await ReverseGeocodeCurrentLocation();

                if (!_found)
                {
                    latitude.Text = address.Latitude.ToString();
                    longitude.Text = address.Longitude.ToString();
                    Toast.MakeText(this, "Localization found.", ToastLength.Short).Show();
                    _found = true;
                }
            }
        }

        async void AddressButton_OnClick(object sender, EventArgs eventArgs)
        {
            if (_currentLocation == null)
            {
                Toast.MakeText(this, "Can't determine the current address. Try again in a few minutes.", ToastLength.Short).Show();
                return;
            }

            Address address = await ReverseGeocodeCurrentLocation();
            string url = "http://api.geonames.org/findNearByWeatherJSON?" +
            "lat=" + address.Latitude.ToString().Replace(",",".") +
            "&lng=" + address.Longitude.ToString().Replace(",", ".") +
            "&username=magnusarias";

            location.Text = address.GetAddressLine(0) + ", " + address.GetAddressLine(1) + "\n" + address.GetAddressLine(2);
            JsonValue json = await FetchWeatherAsync(url);
            ParseAndDisplay(json);
        }

        async Task<Address> ReverseGeocodeCurrentLocation()
        {
            Geocoder geocoder = new Geocoder(this);
            IList<Address> addressList =
                await geocoder.GetFromLocationAsync(_currentLocation.Latitude, _currentLocation.Longitude, 10);

            Address address = addressList.FirstOrDefault();

            return address;
        }


        private void ParseAndDisplay(JsonValue json)
        {
            // Get the weather reporting fields from the layout resource:

            TextView temperature = FindViewById<TextView>(Resource.Id.tempText);
            TextView humidity = FindViewById<TextView>(Resource.Id.humidText);
            TextView conditions = FindViewById<TextView>(Resource.Id.condText);
            TextView barometer = FindViewById<TextView>(Resource.Id.pressureText);

            // Extract the array of name/value results for the field name "weatherObservation".
            JsonValue weatherResults = json["weatherObservation"];

            // The temperature is expressed in Celsius:
            double temp = weatherResults["temperature"];
            // Convert it to Fahrenheit:
            // temp = ((9.0 / 5.0) * temp) + 32;
            // Write the temperature (one decimal place) to the temperature TextBox:
            temperature.Text = String.Format("{0:F1}", temp) + "° C";

            // Get the percent humidity and write it to the humidity TextBox:
            double humidPercent = weatherResults["humidity"];
            humidity.Text = humidPercent.ToString() + "%";

            // Get the "clouds" and "weatherConditions" strings and
            // combine them. Ignore strings that are reported as "n/a":
            string cloudy = weatherResults["clouds"];
            if (cloudy.Equals("n/a"))
                cloudy = "";
            string cond = weatherResults["weatherCondition"];
            if (cond.Equals("n/a"))
                cond = "";

            // Write the result to the conditions TextBox:
            conditions.Text = cloudy + " " + cond;

            double pressure = weatherResults["hectoPascAltimeter"];
            barometer.Text = pressure.ToString() + "hPa";
        }

        void InitializeLocationManager()
        {
            _locationManager = (LocationManager)GetSystemService(LocationService);
            Criteria criteriaForLocationService = new Criteria
            {
                Accuracy = Accuracy.Fine
            };
            IList<string> acceptableLocationProviders =
            _locationManager.GetProviders(criteriaForLocationService, true);

            if (acceptableLocationProviders.Any())
            {
                _locationProvider = acceptableLocationProviders.First();
            }
            else
            {
                _locationProvider = string.Empty;
            }
        }

        private void showGPSDisabledAlertToUser()
        {
            var alertDialogBuilder = new AlertDialog.Builder(this);

            alertDialogBuilder.SetMessage("GPS is disabled in your device. Would you like to enable it?");
            alertDialogBuilder.SetCancelable(false);
            alertDialogBuilder.SetPositiveButton("Goto Settings Page To Enable GPS", (EventHandler<DialogClickEventArgs>) null);
            alertDialogBuilder.SetNegativeButton("Cancel", (EventHandler<DialogClickEventArgs>) null);
            var dialog = alertDialogBuilder.Create();
            dialog.Show();

            var posButton = dialog.GetButton((int)DialogButtonType.Positive);
            var negButton = dialog.GetButton((int)DialogButtonType.Negative);

            posButton.Click += (sender, args) =>
            {
                Intent callGPSSettingIntent = new Intent(Android.Provider.Settings.ActionLocationSourceSettings);
                StartActivity(callGPSSettingIntent);
            };
            negButton.Click += (sender, args) =>
            {
                dialog.Cancel();
            };

        }
    }
}



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:orientation="horizontal"
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:id="@+id/latSection">
        <TextView
            android:text="Latitude:"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="140dp"
            android:layout_height="40dp"
            android:gravity="right"
            android:id="@+id/latLabel"
            android:layout_marginLeft="0.0dp"
            android:layout_marginRight="0.0dp" />
        <EditText
            android:layout_width="150dp"
            android:layout_height="50dp"
            android:id="@+id/latText"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_marginLeft="5dp" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:id="@+id/longSection">
        <TextView
            android:text="Longitude:"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="140dp"
            android:layout_height="40dp"
            android:gravity="right"
            android:id="@+id/longLabel" />
        <EditText
            android:layout_width="150dp"
            android:layout_height="50dp"
            android:id="@+id/longText"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_marginLeft="5dp" />
    </LinearLayout>
    <LinearLayout
        android:orientation="vertical"
        android:layout_marginTop="28dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:id="@+id/getSection">
        <Button
            android:id="@+id/getWeatherButton"
            android:layout_width="300dp"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="Get Weather" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_marginTop="30dp"
        android:layout_marginLeft="40dp"
        android:layout_marginRight="40dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/locSection">
        <TextView
            android:text="Location:"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="120dp"
            android:layout_height="30dp"
            android:gravity="left"
            android:id="@+id/locLabel" />
        <TextView
            android:text=""
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="wrap_content"
            android:layout_height="60dp"
            android:gravity="left"
            android:id="@+id/locationText" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="40dp"
        android:layout_marginRight="40dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tempSection">
        <TextView
            android:text="Temperature:"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="120dp"
            android:layout_height="30dp"
            android:gravity="left"
            android:id="@+id/tempLabel" />
        <TextView
            android:text=""
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="wrap_content"
            android:layout_height="30dp"
            android:gravity="left"
            android:id="@+id/tempText" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="40dp"
        android:layout_marginRight="40dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/humidSection">
        <TextView
            android:text="Humidity:"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="120dp"
            android:layout_height="30dp"
            android:gravity="left"
            android:id="@+id/humidLabel" />
        <TextView
            android:text=""
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="wrap_content"
            android:layout_height="30dp"
            android:gravity="left"
            android:id="@+id/humidText" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="40dp"
        android:layout_marginRight="40dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/condSection">
        <TextView
            android:text="Conditions:"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="120dp"
            android:layout_height="30dp"
            android:gravity="left"
            android:id="@+id/condLabel" />
        <TextView
            android:text=""
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="wrap_content"
            android:layout_height="60dp"
            android:gravity="left"
            android:id="@+id/condText" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="40dp"
        android:layout_marginRight="40dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/pressureSection">
        <TextView
            android:text="Barometer:"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="120dp"
            android:layout_height="30dp"
            android:gravity="left"
            android:id="@+id/pressureLabel" />
        <TextView
            android:text=""
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_width="wrap_content"
            android:layout_height="30dp"
            android:gravity="left"
            android:id="@+id/pressureText" />
    </LinearLayout>
</LinearLayout>