移動應用開發實驗十 —— 網路通信

一、實驗目的

掌握資料決議（以json為例）、網路請求的關鍵內容，

二、實驗內容

1.介面示例（北京）http://www.weather.com.cn/data/sk/101010100.html
2.可選擇和任意切換北京、杭州、廣州、上海的天氣（陰晴雨雪）、氣溫、濕度等，
3.決議json介面獲取的資料，
4.在app中展現天氣結果，

中國天氣網地址：http://www.weather.com.cn
請求服務 : 查詢實時天氣資訊
http://www.weather.com.cn/data/sk/101110101.html
其中101110101是城市的代碼，如果要查詢其他城市的天氣，只需要修改城市的代碼即可，在中國天氣網中城市代碼如下：
101010100=北京
101020100=上海
101210101=杭州
101280101=廣州

三、實驗程序(實驗的設計思路、關鍵源代碼等)

介面代碼配置

public static final String Host_WEATHER="http://www.weather.com.cn";
@GET("/data/cityinfo/{cityId}.html")
Call<CityInfoWeather> getCityInfoWeather(@Path("cityId")String cityId);
@GET("/data/sk/{cityId}.html")
Call<SKWeather> getSKWeather(@Path("cityId")String cityId);

介面具體回傳值詳情

具體布局省略，根據個人意愿進行自定義布局
以下僅供參考

獲取對應的氣溫，風向，濕度，天氣情況等資訊

public class SKWeather {
    private WeatherInfo weatherinfo;

    public WeatherInfo getWeatherInfo(){
        return weatherinfo;
    }
    public void setWeatherInfo(WeatherInfo weatherinfo){
        this.weatherinfo=weatherinfo;
    }
    public class WeatherInfo{
        private String temp;
        private String WD;
        private String SD;
        private String WS;
        private String Humidity;
        private String AP;
        public String getTemp(){return temp;}
        public void setTemp(String temp){this.temp=temp;}
        public String getWD(){return WD;}
        public void WD(String WD){this.WD=WD;}
        public String getSD(){return SD;}
        public void SD(String SD){this.SD=SD;}
        public String getWS(){return WS;}
        public void setWS(String WS){this.WS=WS;}
        public String getHumidity(){return Humidity;}
        public void setHumidity(String Humidity){this.Humidity=Humidity;
        }
        public String getAP(){return AP;}
        public void setAP(String Baro){this.AP=AP;}
    }
}

獲取各個控制元件，呼叫上述方法，將獲取到的資料寫入

public class WeatherActivity extends AppCompatActivity {
    private TextView cityNameTv;
    private TextView tempTv;
    private TextView weatherTv;
    private TextView windDirectionTv;
    private TextView windSpeedTv;
    private TextView humidityTv;
    private TextView baroTv;
    private String cityId;
    ApiService apiService;
    ApiService apiService_ip;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_weather);
        cityNameTv=findViewById(R.id.cityName);
        tempTv=findViewById(R.id.temp);
        weatherTv=findViewById(R.id.weather);
        windDirectionTv=findViewById(R.id.winddirect);
        windSpeedTv=findViewById(R.id.windspeed);
        humidityTv=findViewById(R.id.humidity);
        baroTv=findViewById(R.id.baro);

        cityNameTv.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View view) {
                Intent intent=new Intent(WeatherActivity.this, CityListActivity.class);
                startActivityForResult(intent, CityListActivity.CITY_ID_RESULT_CODE);
            }
        });
        Retrofit retrofit = new Retrofit.Builder().baseUrl("http://www.weather.com.cn").addConverterFactory(GsonConverterFactory.create()).build();
        apiService= retrofit.create(ApiService.class);
        refresh(CityHelper.getDefaultCityId());
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==CityListActivity.CITY_ID_RESULT_CODE){
            if(data != null){
                String cityId=data.getStringExtra(CityListActivity.CITY_ID_KEY);
                refresh(cityId);
            }
        }
    }
    private void refresh(String cityId){
        if(TextUtils.isEmpty(cityId)||cityId.equals(this.cityId)){
            return;
        }
        Call<CityInfoWeather> cityInfoCall= apiService.getCityInfoWeather(cityId);
        cityInfoCall.enqueue(new Callback<CityInfoWeather>(){
            @Override
            public void onResponse(Call<CityInfoWeather> call, final Response<CityInfoWeather> cityInfoResponse) {
                Call<SKWeather> skCall=apiService.getSKWeather(cityId);
                skCall.enqueue(new Callback<SKWeather>() {
                    @Override
                    public void onResponse(Call<SKWeather> call, Response<SKWeather> skResponse) {
                        CityInfoWeather cityInfoWeather= cityInfoResponse.body();
                        SKWeather skWeather=skResponse.body();
                        WeatherActivity.this.cityId=cityId;
                        cityNameTv.setText(getString(R.string.city_name_str,CityHelper.getInstance().getCityInfoMap().get(cityId).getName()));
                        tempTv.setText(getString(R.string.temp_str,skWeather.getWeatherInfo().getTemp()));
                        weatherTv.setText(cityInfoWeather.getWeatherinfo().getWeather());
                        windDirectionTv.setText(getString(R.string.wd_str, skWeather.getWeatherInfo().getWD()));
                        windSpeedTv.setText(getString(R.string.ws_str, skWeather.getWeatherInfo().getWS()));
                        humidityTv.setText(getString(R.string.humidity_str, skWeather.getWeatherInfo().getSD()));
                        baroTv.setText(getString(R.string.baro_str, skWeather.getWeatherInfo().getAP()));
                    }
                    @Override
                    public void onFailure(Call<SKWeather> call, Throwable t) {
                        Toast.makeText(WeatherActivity.this,"請求SK介面失敗", Toast.LENGTH_LONG).show();
                    }
                });
            }
            @Override
            public void onFailure(Call<CityInfoWeather> call, Throwable t) {
                Toast.makeText(WeatherActivity.this,"請求CityInfo介面失敗", Toast.LENGTH_LONG).show();
            }

        });
    }
}

四、實驗結果(實驗最終作品截圖說明)

五、實驗心得

通過本次實驗，了解了如何通過配置介面訪問達到網路通信的效果，以及如何決議JSON資料并將資料展示在app中，