使用 retrofit 无法显示天气数据

Question

I'm trying to display data in my fragment & activity class from a Weather API using retrofit but on running the app, it displays nothing and meanwhile shows no error at runtime. I'm suspecting it will be due to a wrong connection of my retrofit network setup and I have no clue as to where the fault is, I need help, please.

I added Internet Permission in the Manifest

I also tried running the key on my browser online eg https://api.openweathermap.org/data/2.5/onecall?lat=9.0765&lon=7.3986&exclude=alert,hourly,daily,minutely&appid= and it works but doesn't display data on my app

My codes are below:

FirstFragment.java

public class FirstFragment extends Fragment {
    public static String BaseUrl = "http://api.openweathermap.org/";
    public static String AppId = "(My App key)";
    public static String lat = "9.0574";
    public static String lon = "7.4898";
    // User current temperature, current condition, sunrise, sunset, temperature, pressure, humidity, wind_speed, visibility, UV Index
    TextView current_temp, current_output, rise_time, set_time, temp_out, Press_out, Humid_out, Ws_out, Visi_out, UV_out;
    // TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public FirstFragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment SecondFragment.
     */
// TODO: Rename and change types and number of parameters
    public static FirstFragment newInstance(String param1, String param2) {
        FirstFragment fragment = new FirstFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);

        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_first, container, false);
        current_temp = rootView.findViewById(R.id.textView10);
        current_output = rootView.findViewById(R.id.textView11);
        rise_time = rootView.findViewById(R.id.textView25);
        set_time = rootView.findViewById(R.id.textView26);
        temp_out = rootView.findViewById(R.id.textView28);
        Press_out = rootView.findViewById(R.id.textView29);
        Humid_out = rootView.findViewById(R.id.textView30);
        Ws_out = rootView.findViewById(R.id.textView33);
        Visi_out = rootView.findViewById(R.id.textView34);
        UV_out = rootView.findViewById(R.id.textView35);


                Retrofit retrofit = new Retrofit.Builder().baseUrl(BaseUrl).addConverterFactory(GsonConverterFactory.create()).build();
                WeatherService service = retrofit.create(WeatherService.class);
                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;

                            assert response.body() != null;
                            current_temp.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃"));
                            current_output.setText(response.body().getCurrent().getWeather().get(0).getDescription());
                            rise_time.setText(getString(R.string.blank, response.body().getCurrent().getSunrise() + " AM"));
                            set_time.setText(getString(R.string.blank, response.body().getCurrent().getSunset() + " PM"));
                            temp_out.setText(getString(R.string.blank, response.body().getCurrent().getTemp() + " ℃"));
                            Press_out.setText(getString(R.string.blank, response.body().getCurrent().getPressure() + " hpa"));
                            Humid_out.setText(getString(R.string.blank, response.body().getCurrent().getHumidity() + " %"));
                            Ws_out.setText(getString(R.string.blank, response.body().getCurrent().getWindSpeed() + " Km/h"));
                            Visi_out.setText(getString(R.string.blank, response.body().getCurrent().getVisibility() + " m"));
                        }
                    }

                    @Override
                    public void onFailure(@NonNull Call<WeatherResponse> call, @NonNull Throwable t) {
                        t.printStackTrace();
                    }
                });
           return rootView;
            }


    }

HomeActivity.java

public class HomeActivity extends AppCompatActivity {
    public static String BaseUrl = "http://api.openweathermap.org/";
    public static String AppId = "(My App key)";
    public static String lat = "9.0574";
    public static String lon = "7.4898";
    // User Timezone name, current time
    TextView time_zone, time_field;
    ConstraintLayout constraintLayout;
    public static int count=0;
    int[] drawable =new int[]{R.drawable.dubai,R.drawable.central_bank_of_nigeria,R.drawable.eiffel_tower,R.drawable.hong_kong,R.drawable.statue_of_liberty};
    Timer _t;

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

        time_zone = findViewById(R.id.textView9);
        time_field = findViewById(R.id.textView4);

        BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
        NavController navController = Navigation.findNavController(this, R.id.fragment);
        NavigationUI.setupWithNavController(bottomNavigationView, navController);

        Retrofit retrofit = new Retrofit.Builder().baseUrl(BaseUrl).addConverterFactory(GsonConverterFactory.create()).build();
        WeatherService service = retrofit.create(WeatherService.class);
        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;

                    assert response.body() != null;
                    time_zone.setText(response.body().getTimezone());
                    time_field.setText(response.body().getCurrent().getDt());

        constraintLayout = findViewById(R.id.layout);
        constraintLayout.setBackgroundResource(R.drawable.dubai);
        _t = new Timer();
        _t.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                // run on ui thread
                runOnUiThread(() -> {
                    if (count < drawable.length) {

                        constraintLayout.setBackgroundResource(drawable[count]);
                        count = (count + 1) % drawable.length;
                    }
                });
            }
        }, 5000, 5000);
    }
}

                @Override
                public void onFailure(@NotNull Call<WeatherResponse> call, @NotNull Throwable t) {

                }
            });
    }
}

My Interface

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

EDIT

Now it shows java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Integer com.tex.lightweatherforecast.first.Current.getDt()' on a null object reference on runtime after i changed HTTP to https

My Current class:

public class Current {

    @SerializedName("dt")
    @Expose
    private Integer dt;
    @SerializedName("sunrise")
    @Expose
    private Integer sunrise;
    @SerializedName("sunset")
    @Expose
    private Integer sunset;
    @SerializedName("temp")
    @Expose
    private Double temp;
    @SerializedName("feels_like")
    @Expose
    private Double feelsLike;
    @SerializedName("pressure")
    @Expose
    private Integer pressure;
    @SerializedName("humidity")
    @Expose
    private Integer humidity;
    @SerializedName("dew_point")
    @Expose
    private Double dewPoint;
    @SerializedName("uvi")
    @Expose
    private Double uvi;
    @SerializedName("clouds")
    @Expose
    private Integer clouds;
    @SerializedName("visibility")
    @Expose
    private Integer visibility;
    @SerializedName("wind_speed")
    @Expose
    private Double windSpeed;
    @SerializedName("wind_deg")
    @Expose
    private Integer windDeg;
    @SerializedName("weather")
    @Expose
    private List<Weather> weather = null;

    public Integer getDt() {
        return dt;
    }

    public void setDt(Integer dt) {
        this.dt = dt;
    }

    public Integer getSunrise() {
        return sunrise;
    }

    public void setSunrise(Integer sunrise) {
        this.sunrise = sunrise;
    }

    public Integer getSunset() {
        return sunset;
    }

    public void setSunset(Integer sunset) {
        this.sunset = sunset;
    }

    public Double getTemp() {
        return temp;
    }

    public void setTemp(Double temp) {
        this.temp = temp;
    }

    public Double getFeelsLike() {
        return feelsLike;
    }

    public void setFeelsLike(Double feelsLike) {
        this.feelsLike = feelsLike;
    }

    public Integer getPressure() {
        return pressure;
    }

    public void setPressure(Integer pressure) {
        this.pressure = pressure;
    }

    public Integer getHumidity() {
        return humidity;
    }

    public void setHumidity(Integer humidity) {
        this.humidity = humidity;
    }

    public Double getDewPoint() {
        return dewPoint;
    }

    public void setDewPoint(Double dewPoint) {
        this.dewPoint = dewPoint;
    }

    public Double getUvi() {
        return uvi;
    }

    public void setUvi(Double uvi) {
        this.uvi = uvi;
    }

    public Integer getClouds() {
        return clouds;
    }

    public void setClouds(Integer clouds) {
        this.clouds = clouds;
    }

    public Integer getVisibility() {
        return visibility;
    }

    public void setVisibility(Integer visibility) {
        this.visibility = visibility;
    }

    public Double getWindSpeed() {
        return windSpeed;
    }

    public void setWindSpeed(Double windSpeed) {
        this.windSpeed = windSpeed;
    }

    public Integer getWindDeg() {
        return windDeg;
    }

    public void setWindDeg(Integer windDeg) {
        this.windDeg = windDeg;
    }

    public List<Weather> getWeather() {
        return weather;
    }

    public void setWeather(List<Weather> weather) {
        this.weather = weather;
    }
}

Answer 1

I fixed the error by changing the weather? to onecall? in my interface call