如何使用百度天气预报API接口

来源：互联网发布：linux用yum安装rpm包编辑：程序博客网时间：2024/06/05 05:33

前些天知道了如何获取数字签名SHA1，那它用来干嘛的呢？今天就来学习一下它的用处。
比如说我们要开发一款基于位置的服务，如地图、天气预报等。我们要用到API Key。

百度API Key申请地址：http://lbsyun.baidu.com/apiconsole/key

创建应用如图：
这里写图片描述
提交后得到API Key 如图：

接口实例：http://api.map.baidu.com/telematics/v3/weather？location=南昌&output=json&ak=你的API Key&mcode=你的数字签名SHA1;com.example.administrator.jsontest（包名）

接口参数说明

参数类型参数名称是否必须具体描述 String location true 输入城市名或经纬度，城市名如北京或者131，经纬度格式为lng，lat坐标，如：location=116.305145,39.982368;全国值为all，返回省会城市自治区，港澳台天气情况多城市天气预报中间用“|”分隔，如：location=116.305145,39.982368|123.342323,36238945|... String output false 输出的数据格式，默认为xml格式，当output设置为json时，输出的为json数据格式 String coord_type false 请求参数坐标类型，默认为gcj02经纬度坐标。允许的值为bd09ll、bd09mc、gcj02、wgs84；

返回的JSON数据

{    "error":0,    "status":"success",    "date":"2016-03-05",    "results":[        {            "currentCity":"北京",             "pm25":"144",             "index":[                 {                     "title":"穿衣",                    "zs":"较冷",                     "tipt":"穿衣指数",                    "des":"建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。"},                {                    "title":"洗车",                     "zs":"不宜",                     "tipt":"洗车指数",                    "des":"不宜洗车，未来24小时内有扬沙或浮尘，如果在此期间洗车，极易很快蒙上新的灰尘。"},                {                    "title":"旅游",                    "zs":"一般",                     "tipt":"旅游指数",                    "des":"风稍大，扬沙或浮尘天气对能见度和空气质量都会有些影响，出行请注意交通安全和采取适当的防尘措施。"},                {                    "title":"感冒",                    "zs":"易发",                     "tipt":"感冒指数",                    "des":"昼夜温差大，风力较强，易发生感冒，请注意适当增减衣服，加强自我防护避免感冒。"},                {                    "title":"运动",                    "zs":"较不宜",                    "tipt":"运动指数",                    "des":"有扬沙或浮尘，建议适当停止户外运动，选择在室内进行运动，以避免吸入更多沙尘，有损健康。"},                {                    "title":"紫外线强度",                    "zs":"最弱",                     "tipt":"紫外线强度指数",                    "des":"属弱紫外线辐射天气，无需特别防护。若长期在户外，建议涂擦SPF在8-12之间的防晒护肤品。"}           ],  "weather_data":[              {                  "date":"周六 03月05日 (实时：12℃)",              "dayPictureUrl":"http://api.map.baidu.com/images/weather/day/fuchen.png",    "nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png",                  "weather":"浮尘转晴",                  "wind":"北风4-5级",                   "temperature":"12 ~ -1℃"},  {                  "date":"周日", "dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png", "nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png",                  "weather":"多云",                  "wind":"微风",                   "temperature":"10 ~ -3℃"},  {                   "date":"周一",            "dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png", "nightPictureUrl":"http://api.map.baidu.com/images/weather/night/yin.png",                  "weather":"多云转阴",                  "wind":"微风",                   "temperature":"13 ~ 2℃"},  {                   "date":"周二",                "dayPictureUrl":"http://api.map.baidu.com/images/weather/day/yin.png", "nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png",              "weather":"阴转多云",              "wind":"北风3-4级",               "temperature":"6 ~ -1℃"}  ]}]}

我们来写个demo，代码如下：

package com.example.administrator.jsontest;public class MainActivity extends Activity {    private Button button;    private TextView textView;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case 0:                    String re = (String) msg.obj;                    textView.setText(re);                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) findViewById(R.id.button);        textView = (TextView) findViewById(R.id.textView);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Log.i("TAG", "点击了Button");                sendRequestWithHttpClient();            }        });    }    private void sendRequestWithHttpClient() {        new Thread(new Runnable() {            @Override            public void run() {                HttpURLConnection connection = null;                try {                    URL url = new URL("http://api.map.baidu.com/telematics/v3/weather?location=南昌&output=json&ak=8ixCCFzlBB617YX7tONI2P5B&mcode=1C:6B:42:33:E8:A6:DC:A2:11:6E:26:EC:84:BD:42:E3:8E:6B:57:9A;com.example.administrator.jsontest");                    connection = (HttpURLConnection) url.openConnection();                    connection.setRequestMethod("GET");                    connection.setConnectTimeout(5000);                    connection.setReadTimeout(5000);                    InputStream in = connection.getInputStream();                    BufferedReader reader = new BufferedReader(new InputStreamReader(in));                    StringBuilder response = new StringBuilder();                    String line;                    while ((line = reader.readLine()) != null) {                        response.append(line);                    }                    Log.i("TAG", response.toString());                    parseJSONObjectOrJSONArray(response.toString());                } catch (MalformedURLException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                }            }        }).start();    }    //解析JSON数据    private void parseJSONObjectOrJSONArray(String jsonData) {        try {            String count = "";            JSONObject jsonObject = new JSONObject(jsonData);            JSONArray jsonArray = jsonObject.getJSONArray("results");            if (jsonArray.length() > 0) {                JSONObject object = jsonArray.getJSONObject(0);                String city = object.optString("currentCity");                JSONArray array = object.getJSONArray("weather_data");                for (int i = 0; i < array.length(); i++) {                    JSONObject jsonObject1 = array.getJSONObject(i);                    String dateDay = jsonObject1.optString("date");                    String weather = jsonObject1.optString("weather");                    String wind = jsonObject1.optString("wind");                    String temperature = jsonObject1.optString("temperature");                    count =count +"\n"+ dateDay + " " + weather + " " + wind + " " + temperature;                    Log.i("AAA",count);                }                Message message = new Message();                message.what = 0;                message.obj = count;                handler.sendMessage(message);            }        } catch (JSONException e) {            e.printStackTrace();        }    }}

运行结果如下：
这里写图片描述

2 0