为了加入以下我的JSON数据：
[{"id":"1","code":"2020-04-05-20:12:12","cases":"313","recovered":"34","deaths":"6","datesituation":"2020-04-08","timesituation":"16:35:00"}]
我使用下面的代码：
private void getGhanaSituation() {
dataBaseHelper.deleteGhana();
JsonArrayRequest req = new JsonArrayRequest("MyURL",
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
try {
for (int i = 0; i < response.length(); i++) {
JSONObject ghsituation = (JSONObject) response.get(i);
int cases = ghsituation.getInt("cases");
int recovered = ghsituation.getInt("recovered");
int deaths = ghsituation.getInt("deaths");
String datesituation = ghsituation.getString("datesituation");
String timesituation = ghsituation.getString("timesituation");
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
hidepDialog();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("TAG", "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(), "Error"+error.getMessage(), Toast.LENGTH_SHORT).show();
hidepDialog();
}
});
VolleySingleton.getInstance(getApplicationContext()).addToRequestQueue(req);
}
现在我使用了一个API，它给我下面的其他格式：
{"ghana":{"existing":"273","confirmed":"313","recovered":"34","deaths":"6","date":"08th April, 2020","time":"16:35"},"global":{"existing":"1,066,963","confirmed":"1,468,891","recovered":"316,482","deaths":"85,446","date":"08th April, 2020","time":"16:35"}}
我更改了代码：
private void getGhanaSituation() {
dataBaseHelper.deleteGhana();
JsonArrayRequest req = new JsonArrayRequest("https://mazitekgh.com/covid19/v1/",
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
try {
for (int i = 0; i < response.length(); i++) {
JSONObject ghsituation = (JSONObject) response.get(i);
int cases = ghsituation.getInt("confirmed");
int recovered = ghsituation.getInt("recovered");
int deaths = ghsituation.getInt("deaths");
String datesituation = ghsituation.getString("date");
String timesituation = ghsituation.getString("time");
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
hidepDialog();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("TAG", "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(), "Error"+error.getMessage(), Toast.LENGTH_SHORT).show();
hidepDialog();
}
});
VolleySingleton.getInstance(getApplicationContext()).addToRequestQueue(req);
}
当运行APP时，我收到错误消息：*** Errororg.json.JSONException：值：{“ ghana”：{“ existing”：“ 273”，“ confirmed”：“ 313”，“ recovered”：“ 34” ，“死亡”：“ 6”，“日期”：“ 2020年4月8日”，“时间”：“ 16:35”}，“全局”：{“现有”：“ 1,066,963”，“已确认”：“ 1,468,891” “，”已恢复“：” 316,482“，”死亡“：” 85,446“，”日期“：” 2020年4月8日“，”时间“：” 16:35“}}无法转换为JSONArray。
拜托我需要你的帮忙。
I would advise you to use a parser for converting
JSONtoJava Objectas it'll make your life easier and you'll be able to manipulate the data more freely.你有很多选择
Moshi is now in trend, you can use it quite easliy, here is a gist that shows how to use this library.
Gson, here is also a quick tutorial
Jackson, another tutorial to help you get the hand of it.
他们都有自己的优点和缺点。看看githubs并选择一个:)