用openweather API尝试给我们GSON

Question

我正在尝试将GSON与开放式天气地图API结合使用。我能够将JSON解析为以下代码：

final class BiOptional<T, U> {

    @Nullable
    private final T first;
    @Nullable
    private final U second;

    public BiOptional(T first, U second) {
        this.first = first;
        this.second = second;
    }

    public static <T, U> BiOptional<T, U> from(Optional<T> first, Optional<U> second) {
        return new BiOptional<>(first.orElse(null), second.orElse(null));
    }

    public Optional<T> first() {
        return Optional.ofNullable(first);
    }

    public Optional<U> second() {
        return Optional.ofNullable(second);
    }

    public boolean isFirstPresent() {
        return first != null;
    }

    public boolean isSecondPresent() {
        return second != null;
    }

    public boolean isFirstOnlyPresent() {
        return isFirstPresent() && !isSecondPresent();
    }

    public boolean isSecondOnlyPresent() {
        return !isFirstPresent() && isSecondPresent();
    }

    public boolean areBothPresent() {
        return isFirstPresent() && isSecondPresent();
    }

    public boolean areNonePresent() {
        return !isFirstPresent() && !isSecondPresent();
    }

    public BiOptional<T, U> ifFirstOnlyPresent(Consumer<? super T> ifFirstOnlyPresent) {
        if (isFirstOnlyPresent()) {
            ifFirstOnlyPresent.accept(first);
        }
        return this;
    }

    public BiOptional<T, U> ifSecondOnlyPresent(Consumer<? super U> ifSecondOnlyPresent) {
        if (isSecondOnlyPresent()) {
            ifSecondOnlyPresent.accept(second);
        }
        return this;
    }

    public BiOptional<T, U> ifBothPresent(BiConsumer<? super T, ? super U> ifBothPresent) {
        if (areBothPresent()) {
            ifBothPresent.accept(first, second);
        }
        return this;
    }

    public BiOptional<T, U> ifNonePresent(Runnable ifNonePresent) {
        if (areNonePresent()) {
            ifNonePresent.run();
        }
        return this;
    }

    public <X extends Throwable> void ifNonePresentThrow(Supplier<? extends X> throwableProvider) throws X {
        if (areNonePresent()) {
            throw throwableProvider.get();
        }
    }

    public <R> BiOptionalMapper<T, U, R> mapper() {
        return new BiOptionalMapper<>(this);
    }
}

}

公共类主要{

final class BiOptionalMapper<T, U, R> {

    private final BiOptional<T, U> biOptional;
    private R result = null;

    BiOptionalMapper(BiOptional<T, U> biOptional) {
        this.biOptional = biOptional;
    }

    public BiOptionalMapper<T, U, R> onFirstOnlyPresent(Function<? super T, ? extends R> firstMapper) {
        if (biOptional.isFirstOnlyPresent()) {
            setResult(firstMapper.apply(biOptional.first().get()));
        }
        return this;
    }

    public BiOptionalMapper<T, U, R> onSecondOnlyPresent(Function<? super U, ? extends R> secondMapper) {
        if (biOptional.isSecondOnlyPresent()) {
            setResult(secondMapper.apply(biOptional.second().get()));
        }
        return this;
    }

    public BiOptionalMapper<T, U, R> onBothPresent(BiFunction<? super T, ? super U, ? extends R> bothMapper) {
        if (biOptional.areBothPresent()) {
            setResult(bothMapper.apply(biOptional.first().get(), biOptional.second().get()));
        }
        return this;
    }

    public BiOptionalMapper<T, U, R> onNonePresent(Supplier<? extends R> supplier) {
        if (biOptional.areNonePresent()) {
            setResult(supplier.get());
        }
        return this;
    }

    public BiOptionalMapper<T, U, R> onNonePresent(R other) {
        if (biOptional.areNonePresent()) {
            setResult(other);
        }
        return this;
    }

    public <X extends Throwable> BiOptionalMapper<T, U, R> onNonePresentThrow(Supplier<? extends X> throwableProvider) throws X {
        biOptional.ifNonePresentThrow(throwableProvider);
        return this;
    }

    public R result() {
        if (result == null) {
            throw new IllegalStateException("Result absent");
        }
        return result;
    }

    public Optional<R> optionalResult() {
        return Optional.ofNullable(result);
    }

    private void setResult(R result) {
        if (result == null) {
            throw new IllegalArgumentException("Null obtained from a mapper");
        }
        if (this.result != null) {
            throw new IllegalStateException("Result already present: " + this.result);
        }
        this.result = result;
    }
}

公共课天气{

public class List {

@SerializedName("dt")
@Expose
private Integer dt;
@SerializedName("main")
@Expose
private Main main;
@SerializedName("weather")
@Expose
private java.util.List<Weather> weather = null;
@SerializedName("clouds")
@Expose
private Clouds clouds;
@SerializedName("wind")
@Expose
private Wind wind;
@SerializedName("rain")
@Expose
private Rain rain;
@SerializedName("sys")
@Expose
private Sys sys;
@SerializedName("dt_txt")
@Expose
private String dtTxt;

public Integer getDt() {
    return dt;
}

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

public Main getMain() {
    return main;
}

public void setMain(Main main) {
    this.main = main;
}

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

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

public Clouds getClouds() {
    return clouds;
}

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

public Wind getWind() {
    return wind;
}

public void setWind(Wind wind) {
    this.wind = wind;
}

public Rain getRain() {
    return rain;
}

public void setRain(Rain rain) {
    this.rain = rain;
}

public Sys getSys() {
    return sys;
}

public void setSys(Sys sys) {
    this.sys = sys;
}

public String getDtTxt() {
    return dtTxt;
}

public void setDtTxt(String dtTxt) {
    this.dtTxt = dtTxt;
}

}

我一直在网上和这里进行搜索，但一直找不到如何在我的代码中准确使用GSON：

@SerializedName("temp")
@Expose
private Double temp;
@SerializedName("temp_min")
@Expose
private Double tempMin;
@SerializedName("temp_max")
@Expose
private Double tempMax;
@SerializedName("pressure")
@Expose
private Double pressure;
@SerializedName("sea_level")
@Expose
private Double seaLevel;
@SerializedName("grnd_level")
@Expose
private Double grndLevel;
@SerializedName("humidity")
@Expose
private Integer humidity;
@SerializedName("temp_kf")
@Expose
private Integer tempKf;

public Double getTemp() {
    return temp;
}

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

    public Double getTempMin() {
        return tempMin;
    }

    public void setTempMin(Double tempMin) {
        this.tempMin = tempMin;
    }

    public Double getTempMax() {
        return tempMax;
    }

    public void setTempMax(Double tempMax) {
        this.tempMax = tempMax;
    }

public Double getPressure() {
    return pressure;
}

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

public Double getSeaLevel() {
    return seaLevel;
}

public void setSeaLevel(Double seaLevel) {
    this.seaLevel = seaLevel;
}

public Double getGrndLevel() {
    return grndLevel;
}

public void setGrndLevel(Double grndLevel) {
    this.grndLevel = grndLevel;
}

public Integer getHumidity() {
    return humidity;
}

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

public Integer getTempKf() {
    return tempKf;
}

public void setTempKf(Integer tempKf) {
    this.tempKf = tempKf;
}

}

我究竟如何将GSON解析添加到我的代码中？我只需要温度，最高，最低，天气和湿度？

编辑：

这是更多信息。我计划使用带有apikey的常规http连接来获取我的信息。我还计划使用RecyclerView，这是该代码：

@SerializedName("id")
@Expose
private Integer id;
@SerializedName("main")
@Expose
private String main;
@SerializedName("description")
@Expose
private String description;
@SerializedName("icon")
@Expose
private String icon;

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

public String getMain() {
    return main;
}

public void setMain(String main) {
    this.main = main;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public String getIcon() {
    return icon;
}

public void setIcon(String icon) {
    this.icon = icon;
}

}

Answer 1

在您的requestJsonObject方法中，使用volley或okhttp从API获取天气数据。 以String的格式获取数据后，就可以使用以下代码：

List list = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create().fromJson(str, List.class);
Main main = list.getDt();
main.getTemp();
main.getTempMin();
main.getTempMax();

str表示您的api响应数据。 List表示您的第一个实体类。

此外，我强烈建议您重命名您的类名，切勿尝试使用Java的保留名，使它们有意义。