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| 极简天气

极简天气开发日记Day04

Things have done

用了两天时间，终于把困扰了我许久的多层树结构JSON数据的解析搞定了，用了一种很简易的方法。

对于每一层数据，都要对其关键字建立一个实体类，里面定义这一层数据的数据元素，并设置get方法，对于整个JSON数据串也要建立一个实体类存放所有关键字，Result实体类代码如下

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public class Result {
    @SerializedName("HeWeather data service 3.0")
    private List<Weather> weatherInfoList;

    public List<Weather> getWeatherInfoList() {
        return weatherInfoList;
    }
    

}

如下图所示对所需元素建立好实体类

http://pic.yupoo.com/333ddd/FPg5CsrJ/15m52p.png

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public class Now {
    /**
     *  "cond": {} //天气状况
     * "fl": "30", //体感温度
     * "hum": "20%", //相对湿度（%）
     * "pcpn": "0.0", //降水量（mm）
     * "pres": "1001", //气压
     * "tmp": "32", //温度
     * "vis": "10", //能见度（km）
     */
    private Cond cond;
    private String fl;
    private String hum;
    private String tmp;


    public Cond getCond() {
        return cond;
    }

    public void setCond(Cond cond) {
        this.cond = cond;
    }

    public String getFl() {
        return fl;
    }

    public void setFl(String fl) {
        this.fl = fl;
    }

    public String getHum() {
        return hum;
    }

    public void setHum(String hum) {
        this.hum = hum;
    }

    public String getTmp() {
        return tmp;
    }

    public void setTmp(String tmp) {
        this.tmp = tmp;
    }
}

以这个类为例，将实体元素定义好便可直接get到JSON数据中对应的属性值

下面代码中，我在Utility类中建立了handleWeatherResponse方法处理JSON数据，由于需要解析的元素比较多，我按照日期进行了划分，并在调用数据储存方法时候分开处理减少出错率

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public static void handleWeatherResponse(Context context,String response){
    Gson gson=new Gson();
    Result result = gson.fromJson(response, Result.class);
    List<Weather> weatherInfoList = result.getWeatherInfoList();
    Weather weatherInfo = weatherInfoList.get(0);
    Aqi aqi=weatherInfo.getAqi();
    Now now=weatherInfo.getNow();
    Basic basic=weatherInfo.getBasic();
    String cityName=basic.getCity();
    String tempNow=now.getTmp();
    String feelTemp=now.getFl();
    String currentCondition=now.getCond().getTxt();

    //initialize today
    DailyForecast dailyforecast_today =weatherInfo.getDaily_forecast().get(0);
    Astro astro_today= dailyforecast_today.getAstro();
    String sunRiseToday=astro_today.getSr();
    String sunDownToday=astro_today.getSs();
    String tempBelowToday= dailyforecast_today.getTmp().getMin();
    String tempHighToday= dailyforecast_today.getTmp().getMax();
    String wet= dailyforecast_today.getHum();
    String windDir=dailyforecast_today.getWind().getDir();
    String windSc=dailyforecast_today.getWind().getSc();

    //initialize day1
    DailyForecast dailyforecast_day1 =weatherInfo.getDaily_forecast().get(1);
    String timeDay1= dailyforecast_day1.getDate();
    String conditionDay1= dailyforecast_day1.getCond().getTxt_d();
    String tempBelowDay1= dailyforecast_day1.getTmp().getMin();
    String tempHighDay1= dailyforecast_day1.getTmp().getMax();

    //initialize day2
    DailyForecast dailyforecast_day2 =weatherInfo.getDaily_forecast().get(2);
    String timeDay2= dailyforecast_day2.getDate();
    String conditionDay2= dailyforecast_day2.getCond().getTxt_d();
    String tempBelowDay2= dailyforecast_day2.getTmp().getMin();
    String tempHighDay2= dailyforecast_day2.getTmp().getMax();

    //initialize day3
    DailyForecast dailyforecast_day3 =weatherInfo.getDaily_forecast().get(3);
    String timeDay3= dailyforecast_day3.getDate();
    String conditionDay3= dailyforecast_day3.getCond().getTxt_d();
    String tempBelowDay3= dailyforecast_day3.getTmp().getMin();
    String tempHighDay3= dailyforecast_day3.getTmp().getMax();

    saveWeatherInfoBasic(context, cityName, tempNow, feelTemp, currentCondition);
    saveWeatherInfoToday(context,sunRiseToday,sunDownToday,tempBelowToday,tempHighToday,wet,windDir,windSc);
    saveWeatherInfoDay1(context, timeDay1, conditionDay1, tempBelowDay1, tempHighDay1);
    saveWeatherInfoDay2(context, timeDay2, conditionDay2, tempBelowDay2, tempHighDay2);
    saveWeatherInfoDay3(context, timeDay3, conditionDay3, tempBelowDay3, tempHighDay3);
}

对应的save方法很简单，使用SharePreferences来储存数据

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public static void saveWeatherInfoBasic(Context context,String cityName,String tempNow,String feelTemp,String currentCondition){
    SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(context).edit();
    editor.putString("city_name", cityName);
    editor.putString("temp_now", tempNow);
    editor.putString("feel_temp", feelTemp);
    editor.putString("current_condition", currentCondition);
    editor.commit();

}

这样对应元素储存好后便可在ShowWeatherActivity中直接绑定窗体属性，只取部分代码

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private void showWeather(){
    SharedPreferences sharedPreferences= PreferenceManager.getDefaultSharedPreferences(this);
    city_name.setText(sharedPreferences.getString("city_name","Null"));
    temp_now.setText(sharedPreferences.getString("temp_now","Null") + "℃");
    feel_temp.setText(sharedPreferences.getString("feel_temp","Null") + "℃");
    current_condition.setText(sharedPreferences.getString("current_condition","Null"));
    }

至于获取JSON数据方法很简单，使用百度ApiStoreSDK直接调用即可

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private void apiTest(String countyName) {

    ApiStoreSDK.init(getApplicationContext(), "*****************");
    Parameters para = new Parameters();
    para.put("city", countyName);
    ApiStoreSDK.execute("http://apis.baidu.com/heweather/weather/free",
            ApiStoreSDK.GET,
            para,
            new ApiCallBack() {

                @Override
                public void onSuccess(int status, String responseString) {

                    Log.d("test", responseString);
                    Utility.handleWeatherResponse(ShowWeatherActivity.this, responseString);
                    showWeather();
                    Log.i("test", "onSuccess" + responseString);
                }

                @Override
                public void onComplete() {
                    Log.i("test", "onComplete");
                }

                @Override
                public void onError(int status, String responseString, Exception e) {
                    Log.i("test", "onError, status: " + status);
                    Log.i("test", "errMsg: " + (e == null ? "" : e.getMessage()));
                }
            });

}

Things to do

完善逻辑，重写Back事件以及实现下拉刷新功能