Bu app modelimizde ki amacımız Retrofit Kütüphanesini öğrenmek..

İlk olarak uygulamamız nasıl duracak, tasarımımız kafanız da canlanması adına aşağıdaki görselleri inceleyebilirsiniz.

      

 

activity_main xml kodlarım;

 

• <?xml version=”1.0″ encoding=”utf-8″?>
  <android.support.constraint.ConstraintLayout xmlns:android=”http://schemas.android.com/apk/res/android”
  xmlns:app=”http://schemas.android.com/apk/res-auto”
  xmlns:tools=”http://schemas.android.com/tools”
  android:layout_width=”match_parent”
  android:layout_height=”match_parent”
  tools:context=”.MainActivity”><TextView
  android:id=”@+id/textView”
  android:layout_width=”wrap_content”
  android:textSize=”16sp”
  android:layout_height=”wrap_content”
  app:layout_constraintBottom_toBottomOf=”parent”
  app:layout_constraintLeft_toLeftOf=”parent”
  app:layout_constraintRight_toRightOf=”parent”
  app:layout_constraintTop_toTopOf=”parent” /><Button
  android:id=”@+id/button”
  android:layout_width=”wrap_content”
  android:layout_height=”wrap_content”
  android:layout_marginTop=”20dp”
  android:text=”Get Current Weather Data”
  app:layout_constraintEnd_toEndOf=”parent”
  app:layout_constraintStart_toStartOf=”parent”
  app:layout_constraintTop_toBottomOf=”@+id/textView” /></android.support.constraint.ConstraintLayout>

  ————————————————

  *3 temel sınıfa ihtiyacım var:

• MainActivity.class  //isterseniz başka bir sınıftandan da yönetebilirsiniz.
• RetrofitModel // Ben projem de WeatherResponse.java adında bir sınıf oluşturdum. Kodlarını aşağıya bırakacağım. RetrofitModel kısmında json’ımız @Serialized ettiğimiz kısım.
• Interface // Ben WeatherService.java adında bir sınıf oluşturdum. Bu sınıfta ise GET, POST, DELETE, PUT işlemlerini yapıyoruz.

 

Gelelim kodlarımıza..

MainActivity.class

package com.example.weatherapp;

import android.graphics.Typeface;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;

import android.view.View;
import android.widget.TextView;

import com.ajts.androidmads.fontutils.FontUtils;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class MainActivity extends AppCompatActivity {

    public static String BaseUrl = "http://api.openweathermap.org/";
    public static String AppId = "59b72279fcf766f62815ebf956ba2774";
    public static String lat = "41.0138";
    public static String lon = "28.9497";

    private TextView weatherData;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        weatherData = findViewById(R.id.textView);

        Typeface typeface = Typeface.createFromAsset(getAssets(), "Lato-Bold.ttf");
        FontUtils fontUtils = new FontUtils();
        fontUtils.applyFontToView(weatherData, typeface);


        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getCurrentData();
            }
        });
    }

    void getCurrentData() {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BaseUrl)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        WeatherService service = retrofit.create(WeatherService.class); //WeatherService sınıfımdam bir tane obje yaratıyorum
        Call<WeatherResponse> call = service.getCurrentWeatherData(lat, lon, AppId);
        call.enqueue(new Callback<WeatherResponse>() {
            @Override
            public void onResponse(@NonNull Call<WeatherResponse> call, @NonNull Response<WeatherResponse> response) {
                if (response.code() == 200) {
                    WeatherResponse weatherResponse = response.body();
                    assert weatherResponse != null;

                    String stringBuilder = "Country: " +
                            weatherResponse.sys.country +
                            "\n" +
                            "Temperature: " +
                            weatherResponse.main.temp +
                            "\n" +
                            "Temperature(Min): " +
                            weatherResponse.main.temp_min +
                            "\n" +
                            "Temperature(Max): " +
                            weatherResponse.main.temp_max +
                            "\n" +
                            "Humidity: " +
                            weatherResponse.main.humidity +
                            "\n" +
                            "Pressure: " +
                            weatherResponse.main.pressure;

                    weatherData.setText(stringBuilder);
                }
            }

            @Override
            public void onFailure(@NonNull Call<WeatherResponse> call, @NonNull Throwable t) {
                weatherData.setText(t.getMessage());
            }
        });
    }


}


WeatherResponse.java

package com.example.weatherapp;

import com.google.gson.annotations.SerializedName;

import java.util.ArrayList;

public class WeatherResponse {

    @SerializedName("coord")
    public Coord coord;
    @SerializedName("sys")
    public Sys sys;
    @SerializedName("weather")
    public ArrayList<Weather> weather = new ArrayList<Weather>();
    @SerializedName("main")
    public Main main;
    @SerializedName("wind")
    public Wind wind;
    @SerializedName("rain")
    public Rain rain;
    @SerializedName("clouds")
    public Clouds clouds;
    @SerializedName("dt")
    public float dt;
    @SerializedName("id")
    public int id;
    @SerializedName("name")
    public String name;
    @SerializedName("cod")
    public float cod;
}

class Weather {
    @SerializedName("id")
    public int id;
    @SerializedName("main")
    public String main;
    @SerializedName("description")
    public String description;
    @SerializedName("icon")
    public String icon;
}

class Clouds {
    @SerializedName("all")
    public float all;
}

class Rain {
    @SerializedName("3h")
    public float h3;
}

class Wind {
    @SerializedName("speed")
    public float speed;
    @SerializedName("deg")
    public float deg;
}

class Main {
    @SerializedName("temp")
    public float temp;
    @SerializedName("humidity")
    public float humidity;
    @SerializedName("pressure")
    public float pressure;
    @SerializedName("temp_min")
    public float temp_min;
    @SerializedName("temp_max")
    public float temp_max;
}

class Sys {
    @SerializedName("country")
    public String country;
    @SerializedName("sunrise")
    public long sunrise;
    @SerializedName("sunset")
    public long sunset;
}

class Coord {
    @SerializedName("lon")
    public float lon;
    @SerializedName("lat")
    public float lat;


}

WeatherService.java

import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;

public interface WeatherService {

    @GET("data/2.5/weather?")
    Call<WeatherResponse> getCurrentWeatherData(@Query("lat") String lat, @Query("lon") String lon, @Query("APPID") String app_id);
}

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 Github link:   " github.com/yaseminuctas/WeatherApp "