基于百度定位获取当前城市请求天气信息

一个简单易懂的小例子。用到的知识点。

1.基于百度定位SDK获取当前城市

2.使用聚合数据提供的天气信息API

3.异步发送位置信息请求天气数据

百度定位SDK的使用不再详细介绍，参考百度地图提供的资料很容易配置。给出百度地图定位SDK用法连接。http://lbsyun.baidu.com/index.php?title=android-locsdk/guide/key

在代码中详细介绍

public class MainActivity extends AppCompatActivity {
    public LocationClient mLocationClient = null;
    public BDLocationListener myListener = new MyLocationListener();
    TextView textView;
    String mCity = "";//存放当前城市
    String mCurrentLocation = "";//当前位置信息

    String mTem = "";//当前温度

    TextView mCitytv;//显示城市
    TextView mWeathertv;//显示天气
    TextView mTemtv;//显示温度

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
                //绑定控件
        findview();
                //获取位置
        getLocation();
    }

    private void findview() {
        mCitytv = (TextView) findViewById(R.id.x_CurrentCity);
        mWeathertv = (TextView) findViewById(R.id.x_CurrentWeather);
        mTemtv = (TextView) findViewById(R.id.x_CurrentTem);
    }

/*
    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            Bundle bundle = msg.getData();
            String location = bundle.getString("位置");
            //将位置传入异步线程中请求天气信息
            new ASyncUploadImage().execute(location);
        }
    };
*/

    private void getLocation() {
        //获取地理位置管理器
        mLocationClient = new LocationClient(getApplicationContext());     //声明LocationClient类
        initLocation();
        mLocationClient.registerLocationListener(myListener);    //注册监听函数
        mLocationClient.start();
        mLocationClient.requestLocation();
    }

    private void initLocation() {
        LocationClientOption option = new LocationClientOption();
        option.setIsNeedAddress(true);
        option.setOpenGps(true);
        option.setLocationMode(LocationClientOption.LocationMode.Hight_Accuracy
        );//可选，默认高精度，设置定位模式，高精度，低功耗，仅设备
        option.setCoorType("gcj02");//可选，默认gcj02，设置返回的定位结果坐标系
        //int span = 1000;
        //option.setScanSpan(span);//可选，默认0，即仅定位一次，设置发起定位请求的间隔需要大于等于1000ms才是有效的
        mLocationClient.setLocOption(option);
    }

    public class MyLocationListener implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            //Receive Location
                        //获取城市
            String city = location.getCity();

            /*Bundle bundle = new Bundle();
            bundle.putString("位置", city);
            Message msg=Message.obtain();
            msg.setData(bundle);
            msg.what = 0;
            handler.sendMessage(msg);*/
            //  handler.sendEmptyMessage(0);
            mCitytv.setText(city);
            ASyncUploadImage as = new ASyncUploadImage();
            as.execute(city);
        }
    }

    private class ASyncUploadImage extends AsyncTask<String, Void, String> {

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            //处理接收到的json字符串  这个方法是在UI线程执行，所以能直接更新界面
            getJson(s);
        }

        @Override
        protected String doInBackground(String... params) {
            //返回接收到的数据
            return getData(params[0]);
        }
    }

    private String getData(String string) {
        //将传进来的城市名转为utf-8格式
        String strUTF8 = null;
        try {
            strUTF8 = URLDecoder.decode(string, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        //拼接url地址
        String url = "http://op.juhe.cn/onebox/weather/query?cityname=" + strUTF8 + "&key=a7c1f7ebf5f9484e8e5722f54e66d227";
        Log.i("TAG", "url=" + url);
        InputStreamReader isr;
        String result = "";
        try {
            //获取url的输入流
            isr = new InputStreamReader(new URL(url).openStream(), "utf-8");
            BufferedReader br = new BufferedReader(isr);
            String line = "";
            //将输入流中的数据保存到字符串result中
            while ((line = br.readLine()) != null) {
                result += line;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }



    private void getJson(String json) {
        //json字符串处理
        try {
            JSONObject jsonObject = new JSONObject(json);
            String reason = jsonObject.getString("reason");
            Log.i("TAG", "reason=" + reason);
            String result = jsonObject.getString("result");
            Log.i("TAG", "result=" + result);
            JSONObject jsonResult = new JSONObject(result);
            String data = jsonResult.getString("data");
            Log.i("TAG", "data=" + data);
            JSONObject jsonData = new JSONObject(data);
            String realtime = jsonData.getString("realtime");
            Log.i("TAG", "realtime=" + realtime);
            JSONObject jsonRealtime = new JSONObject(realtime);
            String weather = jsonRealtime.getString("weather");
            JSONObject jsonWeather = new JSONObject(weather);
            String info = jsonWeather.getString("info");
            Log.i("TAG", "info=" + info);
            String temperature = jsonWeather.getString("temperature");
            Log.i("TAG", "temperature=" + temperature);
            //将读取到的信息显示到界面
            //显示温度
            mTemtv.setText(temperature);
            //显示天气
            mWeathertv.setText(info);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

JSON数据示例
{
“reason”: “查询成功”,
“result”: {
“data”: {
“realtime”: {
“city_code”: “101210701”,
“city_name”: “温州”, /城市/
“date”: “2014-10-15”, /日期/
“time”: “09:00:00”, /更新时间/
“week”: 3,
“moon”: “九月廿二”,
“dataUptime”: 1413337811,
“weather”: { /当前实况天气/
“temperature”: “19”, /温度/
“humidity”: “54”, /湿度/
“info”: “雾”,
“img”: “18” /*18是雾这种天气所对应的图片的ID，每种天气的图片需要您自己设计，或者请阅读
https://www.juhe.cn/docs/api/id/39/aid/117*/
},
“wind”: {
“direct”: “北风”,
“power”: “1级”,
“offset”: null,
“windspeed”: null
}
},
“life”: { /生活指数/
“date”: “2014-10-15”,
“info”: {
“chuanyi”: [ /穿衣指数/
“较舒适”,
“建议着薄外套或牛仔衫裤等服装。年老体弱者宜着夹克衫、薄毛衣等。昼夜温差较大，注意适当增减衣服。”
],
“ganmao”: [ /感冒指数/
“较易发”,
“昼夜温差较大，较易发生感冒，请适当增减衣服。体质较弱的朋友请注意防护。”
],
“kongtiao”: [ /空调指数/
“较少开启”,
“您将感到很舒适，一般不需要开启空调。”
],
“wuran”: [ /污染指数/
“良”,
“气象条件有利于空气污染物稀释、扩散和清除，可在室外正常活动。”
],
“xiche”: [ /洗车指数/
“较适宜”,
“较适宜洗车，未来一天无雨，风力较小，擦洗一新的汽车至少能保持一天。”
],
“yundong”: [ /运动指数/
“较适宜”,
“天气较好，但风力较大，推荐您进行室内运动，若在户外运动请注意防风。”
],
“ziwaixian”: [ /紫外线/
“中等”,
“属中等强度紫外线辐射天气，外出时建议涂擦SPF高于15、PA+的防晒护肤品，戴帽子、太阳镜。”
]
}
},
“weather”: [ /未来几天天气预报/
{
“date”: “2014-10-15”,
“info”: {
“day”: [ /白天天气/
“0”, /天气ID/
“晴”, /天气/
“24”, /高温/
“东北风”, /风向/
“3-4 级” /风力/
],
“night”: [ /夜间天气/
“0”,
“晴”,
“13”,
“东北风”,
“3-4 级”
]
},
“week”: “三”,
“nongli”: “九月廿二”
},
{
“date”: “2014-10-16”,
“info”: {
“dawn”: [
“0”,
“晴”,
“13”,
“东北风”,
“3-4 级”
],
“day”: [
“0”,
“晴”,
“25”,
“东北风”,
“3-4 级”
],
“night”: [
“1”,
“多云”,
“15”,
“东北风”,
“3-4 级”
]
},
“week”: “四”,
“nongli”: “九月廿三”
},
{
“date”: “2014-10-17”,
“info”: {
“dawn”: [
“1”,
“多云”,
“15”,
“东北风”,
“3-4 级”
],
“day”: [
“1”,
“多云”,
“26”,
“东北风”,
“3-4 级”
],
“night”: [
“1”,
“多云”,
“16”,
“东北风”,
“3-4 级”
]
},
“week”: “五”,
“nongli”: “九月廿四”
},
{
“date”: “2014-10-18”,
“info”: {
“dawn”: [
“1”,
“多云”,
“16”,
“东北风”,
“3-4 级”
],
“day”: [
“1”,
“多云”,
“26”,
“东风”,
“3-4 级”
],
“night”: [
“1”,
“多云”,
“18”,
“东风”,
“3-4 级”
]
},
“week”: “六”,
“nongli”: “九月廿五”
},
{
“date”: “2014-10-19”,
“info”: {
“dawn”: [
“1”,
“多云”,
“18”,
“东风”,
“3-4 级”
],
“day”: [
“1”,
“多云”,
“27”,
“东风”,
“3-4 级”
],
“night”: [
“1”,
“多云”,
“19”,
“东南风”,
“3-4 级”
]
},
“week”: “日”,
“nongli”: “九月廿六”
},
{
“date”: “2014-10-20”,
“info”: {
“dawn”: [
“1”,
“多云”,
“19”,
“东南风”,
“3-4 级”
],
“day”: [
“1”,
“多云”,
“27”,
“东南风”,
“3-4 级”
],
“night”: [
“2”,
“阴”,
“18”,
“南风”,
“3-4 级”
]
},
“week”: “一”,
“nongli”: “九月廿七”
},
{
“date”: “2014-10-21”,
“info”: {
“dawn”: [
“2”,
“阴”,
“18”,
“南风”,
“3-4 级”
],
“day”: [
“1”,
“多云”,
“26”,
“东北风”,
“3-4 级”
],
“night”: [
“2”,
“阴”,
“17”,
“”,
“微风”
]
},
“week”: “二”,
“nongli”: “九月廿八”
}
],
“pm25”: { /PM2.5/
“key”: “Wenzhou”,
“show_desc”: 0,
“pm25”: {
“curPm”: “97”,
“pm25”: “72”,
“pm10”: “97”,
“level”: 2,
“quality”: “良”,
“des”: “可以接受的，除极少数对某种污染物特别敏感的人以外，对公众健康没有危害。”
},
“dateTime”: “2014年10月15日09时”,
“cityName”: “温州”
},
“date”: null,
“isForeign”: 0
}
},
“error_code”: 0
}
https://www.juhe.cn/docs/api/id/73