Question

基本上我正在尝试制作天气应用程序。我试图检索一些数据（比如说来自crood对象的lat和lon）但是每当我运行应用程序时它都没有向我显示任何错误，但它在logcat中显示一个异常，它表示＆＃34;没有价值的crood＆＃34 ;.我已经尝试了我拥有的所有资源，但我无法将数据显示到textviews。

这是我想要定位的json

{"coord":{"lon":-0.13,"lat":51.51},"weather":      [{"id":721,"main":"Haze","description":"haze","icon":"50d"},     {"id":501,"main":"Rain","description":"moderate rain","icon":"10d"},  {"id":311,"main":"Drizzle","description":"rain and drizzle","icon":"09d"}],"base":"stations","main":{"temp":286.15,"pressure":1013,"humidity":87,"temp_min":286.15,"temp_max":286.15},"visibility":10000,"wind":{"speed":3.1,"deg":200},"clouds":{"all":75},"dt":1445700000,"sys":  {"type":1,"id":5089,"message":0.0153,"country":"GB","sunrise":1445668823,"sunset":1445705286},"id":2643743,"name":"London","cod":200}

我就是这样做的

            String finalJson=buffer.toString();

            JSONObject parentObject = new JSONObject(finalJson);
            JSONObject jsonObject =parentObject.getJSONObject("crood");

如果有人帮我解释这个逻辑怎么解析它。我希望从这些数据中得到lat，lon，name，description，temp和pressure，我想在textviews中显示它。

Answer 1

问题是关键。我使用了错误的密钥。：3 crood而不是coord

Answer 2

创建模型，在set中声明你想要的东西并获得。
接下来创建arrayadapter并定位对象。

创建活动声明

HttpClient client = new DefaultHttpClient（）;

            HttpGet request = new HttpGet("Url Json Url");

            HttpResponse response = client.execute(request);

            HttpEntity resEntity = response.getEntity();

            String json = EntityUtils.toString(resEntity);

            JSONArray jarray = new JSONArray(json);

            newsList = new ArrayList<NewsModel>();

            for (int i = 0; i < jarray.length(); i++)

{

                JSONObject row = jarray.getJSONObject(i);

                NewsModel data = new NewsModel();

                data.setTitle(row.getString("title"));

                data.setContent(row.getString("content"));

                data.setExcerpt(row.getString("excerpt"));

                data.setDate(row.getString("date"));

                data.setImage(row.getString("feature_image"));

                newsList.add(data);

Answer 3

在

下面创建模型

ublic class NewsModel implements Serializable{

String title;

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public String getContent() {
    return content;
}

public void setContent(String content) {
    this.content = content;
}

public String getExcerpt() {
    return excerpt;
}

public void setExcerpt(String excerpt) {
    this.excerpt = excerpt;
}

public String getDate() {
    return date;
}

public void setDate(String date) {
    this.date = date;
}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}

String content;
String excerpt;
String date;
String image;

}

在检索json数据时遇到问题。如何检索它

3 个答案: