[英]How to access the JSON element?
@Override
protected void onPostExecute(String response) {
String firstName = null;
String lastName = null;
try {
JSONObject jsonResponse = new JSONObject(response);
JSONArray jsonArray = jsonResponse.getJSONArray("");
JSONObject userInfo = jsonArray.getJSONObject(0);
firstName = userInfo.getString("id");
lastName = userInfo.getString("id");
}
catch (JSONException e){
e.printStackTrace();
}
我有这个 JSON 文件https://api.myjson.com/bins/1a5t7w我如何访问这些值,我使用了这段代码但它不起作用? 它返回@null@
try {
JSONArray rspArr = new JSONArray(response);
for(int i= 0; i< rspArr.length(); i++){
JSONObject jsonObject = (JSONObject) rspArr.get(i);
//Your logic
}
}catch (Exception e ){
//log exception
}
// since you know is an array, create a JSONArray based on your response String
JSONArray array = JSONArray(response)
// obtain the first element of your array as a JSONObject
JSONObject jsonObject = array.getJSONObject(0)
// once you get the jsonObject you can start getting the values you need
String id = jsonObject.getString("id")
希望能帮助到你!
Arunangshu 的回答似乎是正确的,您需要先提取 JSONArray,因为 API 返回 JSONArray(JSON 对象数组)而不是一个大的 JSON 对象。
可以使用http://jsonviewer.stack.hu/查看 JSON。 它可以更好地理解 JSON 结构。
对于 Java,可以使用http://www.jsonschema2pojo.org/将 JSON 对象(不是数组)转换为 Java Pojo 类(仔细选择选项)。
以下是 json 数组中的第一个对象 -
{"id":48191,"title":"Apple Crumble Recipe","image":"https://spoonacular.com/recipeImages/48191-312x231.jpg","imageType":"jpg","usedIngredientCount":1,"missedIngredientCount":2,"missedIngredients":[{"id":4073,"amount":35.0,"unit":"g","unitLong":"grams","unitShort":"g","aisle":"Milk, Eggs, Other Dairy","name":"margarine","original":"35 g margarine or butter","originalString":"35 g margarine or butter","originalName":"margarine or butter","metaInformation":[],"meta":[],"image":"https://spoonacular.com/cdn/ingredients_100x100/butter-sliced.jpg"},{"id":8120,"amount":35.0,"unit":"g","unitLong":"grams","unitShort":"g","aisle":"Cereal","name":"rolled oats","original":"35 g rolled oats","originalString":"35 g rolled oats","originalName":"rolled oats","metaInformation":[],"meta":[],"image":"https://spoonacular.com/cdn/ingredients_100x100/rolled-oats.jpg"}],"usedIngredients":[{"id":9003,"amount":400.0,"unit":"g","unitLong":"grams","unitShort":"g","aisle":"Produce","name":"apples","original":"400 g cooking apples peeled cored and quartered","originalString":"400 g cooking apples peeled cored and quartered","originalName":"cooking apples peeled cored and quartered","metaInformation":["cored","peeled","quartered"],"meta":["cored","peeled","quartered"],"image":"https://spoonacular.com/cdn/ingredients_100x100/apple.jpg"}],"unusedIngredients":[],"likes":965}
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