android天气预报API获取天气信息

最近在做一个小东西。需要使用到天气预报。之前查了查了很多有关于这个的代码。但是最近才看懂。

首先，需要找到一个可用的天气API接口。之前 一直尝试的是中国天气预报网的。http://www.weather.com.cn/weather1d/101120101.shtml

但是使用json一直解析失败。不知道是怎么回事。

后来发现可以使用百度车联网提供的天气API接口。http://developer.baidu.com/map/index.php?title=car/api/weather

这里面的给的接口实例是这样的：

http://api.map.baidu.com/telematics/v3/weather?location=北京&output=json&ak=yourkey

但是如果我们就这样写的话，没有办法得到数据。是因为还得将我们的mcode加在后面。如下所示:

"http://api.map.baidu.com/telematics/v3/weather?location="+ URLEncoder.encode(城市名称, "UTF-8")+"&output=json&ak=你的百度ak&mcode=你的mcode;

百度ak申请地址：

http://lbsyun.baidu.com/apiconsole/key

接下来就可以开始进行json数据的获取。

private String getRequst(String uri) {
		httpGet = new HttpGet(uri);
		String result = "";
		try {
			httpResponse = httpClient.execute(httpGet);
			if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				HttpEntity entity = httpResponse.getEntity();  
				result= EntityUtils.toString(entity);
				return result;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

此时返回的result就是网页以json的形式返回的数据。

拿到的json数据格式如下：

{"error":0,"status":"success","date":"2015-03-06",
		"results":[{"currentCity":"济南","pm25":"96",
			"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":"较适宜","tipt":"洗车指数","des":"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。"},
				{"title":"旅游","zs":"适宜","tipt":"旅游指数","des":"天气较好，风稍大，但温度适宜，是个好天气哦。适宜旅游，您可以尽情地享受大自然的无限风光。"},
				{"title":"感冒","zs":"少发","tipt":"感冒指数","des":"各项气象条件适宜，无明显降温过程，发生感冒机率较低。"},
				{"title":"运动","zs":"较适宜","tipt":"运动指数","des":"天气较好，但考虑风力较强且气温较低，推荐您进行室内运动，若在户外运动注意防风并适当增减衣物。"},
				{"title":"紫外线强度","zs":"中等","tipt":"紫外线强度指数","des":"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_data":[
				{"date":"周五 03月06日 (实时：6℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"晴","wind":"南风3-4级","temperature":"5℃"},
				{"date":"周六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"晴","wind":"南风3-4级","temperature":"15 ~ 8℃"},
				{"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":"北风3-4级","temperature":"14 ~ -1℃"},
				{"date":"周一","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"晴","wind":"北风3-4级","temperature":"7 ~ -2℃"}]}]
}

此时对json数据进行解析。

通过观察，发现我们拿到的数据是以键值对的形式出现的。并且在部分内容中包含了数组，而那些才是我们需要的内容。所以先通过JSONObject拿到对象，然后再得到其中的数组。

public  void parseString(String jsonText) {  
         try {
        	 JSONObject root;
        	 JSONObject jsonObject = null;
        	 root = new JSONObject(jsonText);
        	 JSONArray array1 = root.getJSONArray("results"); 
        	 Log.v(TAG, TAG+"  lx array1 length is "+array1.length());
        	 if(array1.length()>=1) {
        		 jsonObject = array1.getJSONObject(array1.length()-1);
        		 JSONArray array2 = jsonObject.getJSONArray("weather_data"); 
        		 if(array2.length()>=1) {
        			JSONObject lan = array2.getJSONObject(0); 
         	        date = lan.getString("date");
         	        weather = lan.getString("weather");
         	        temperature = lan.getString("temperature");
        		 }
        	 }
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	 }