我正在使用volley进行JSON解析。我想从服务器端使用GET获取一些我尝试发送的数据。谁能告诉我如何?以下是我的代码。我也尝试了HashMap
和JSONobject
,但收到此错误。
类型org.json.JSONObject不能转换为JSONArray
还有更多,请告诉我为什么。
JSON格式
{
"Baby Care": [{
"id": "35",
"sub_category": "Baby Food"
}, {
"id": "36",
"sub_category": "Diapers & Wipes"
}, {
"id": "38",
"sub_category": "Baby Accessories"
}],
"Personal Care": [{
"id": "27",
"sub_category": "Skin Care"
}, {
"id": "28",
"sub_category": "Hair Care"
}, {
"id": "29",
"sub_category": "Oral Care"
}, {
"id": "30",
"sub_category": "Bath, Face & Hand Wash"
}],
"Grocery": [{
"id": "51",
"sub_category": "Cheese"
}, {
"id": "52",
"sub_category": "Cakes & Toast"
}, {
"id": "63",
"sub_category": "Beverages"
}, {
"id": "69",
"sub_category": "Dal & Pulses"
}, {
"id": "70",
"sub_category": "Rice"
}],
"Household": [{
"id": "59",
"sub_category": "Kitchen Appliances"
}, {
"id": "60",
"sub_category": "Vacuum and Floor care"
}],
"Women": [{
"id": "64",
"sub_category": "Jewellery"
}, {
"id": "65",
"sub_category": "Make-up"
}, {
"id": "66",
"sub_category": "Perfume"
}],
"Men": [{
"id": "67",
"sub_category": "Perfume"
}, {
"id": "68",
"sub_category": "Accessories"
}]
}
我如何获得这种JSON格式并使用Volley设置为
ListView
,我尝试了以下代码,但没有得到任何对象:JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(productUrl, new Response.Listener < JSONArray > () {
@Override
public void onResponse(JSONArray response) {
try {
for (int i = 0; i < response.length(); i++) {
JSONArray ja = response.getJSONArray(i);
for (int j = 0; j < ja.length(); j++) {
JSONObject jb = ja.getJSONObject(j);
SubProduct movie = new SubProduct();
movie.setId(jb.getInt("id"));
movie.setname(jb.getString("sub_category"));
movieList.add(movie);
}
}
adapter.notifyDataSetChanged();
progressDialog.dismiss();
} catch (JSONException e) {
e.printStackTrace();
progressDialog.dismiss();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("Volley", error.toString());
progressDialog.dismiss();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonArrayRequest);
最佳答案
使用 :
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET,
productUrl, null,
new Response.Listener<JSONObject>() {
代替 :
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(productUrl, new Response.Listener<JSONArray>(){
使用以下代码获取数组的动态键:
Iterator<?> keys = response.keys();
while( keys.hasNext() ) {
String key = (String)keys.next();
if ( response.get(key) instanceof JSONObject ) {
System.out.println(key); // do whatever you want with it
}
}
您可以使用以下代码获取对象:
JSONArray arr = response.getJSONArray(key);
JSONObject element;
for(int i = 0; i < arr.length(); i++){
element = arr.getJSONObject(i);
}