【发布时间】：2021-04-30 10:45:30
【问题描述】：
我需要从此链接http://www.autotrack.rs/android_juzna_backa/get_voznja.php? 将数据检索到列表视图。我需要使用 value-POST 方法发送密钥，以获得如下信息：http://www.autotrack.rs/android_juzna_backa/get_voznja.php?voznja_id=42。我的代码如下：谢谢。错误 org.json.JSONObject$1 类型数据的值为 null 无法转换为 JSONArray
public class fetchData extends AsyncTask<String, String, String> {
@Override
public void onPreExecute() {
super.onPreExecute();
swipeRefresh.setRefreshing(true);
}
@Override
protected String doInBackground(String... params) {
arrayList.clear();
String result = null;
try {
OkHttpClient client = new OkHttpClient().newBuilder()
.build();
MediaType mediaType = MediaType.parse("text/plain");
RequestBody body = new MultipartBody.Builder().setType(MultipartBody.FORM)
.addFormDataPart("voznja_id", "42")
.build();
Request request = new Request.Builder()
.url("http://www.autotrack.rs/android_juzna_backa/get_voznja.php")
.method("POST", body)
.build();
try {
response = client.newCall(request).execute();
// System.out.println(response.body().string());
} catch (IOException e) {
e.printStackTrace();
}
return "";
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
@Override
public void onPostExecute(String rezultat) {
try {
rezultat = response.body().string();
}catch (Exception m)
{
m.printStackTrace();
}
Intent intent;
Gson gson = new Gson();
Type type = new TypeToken<Voznja>() {
}.getType();
Voznja voznja = gson.fromJson(rezultat, type);
Intent im = new Intent(getApplicationContext(), Unos.class);
im.putExtra("voznja", voznja);
// startActivity(im);
swipeRefresh.setRefreshing(false);
try {
JSONObject object = new JSONObject(rezultat);
JSONArray array = object.getJSONArray("data");
for (int i = 0; i < array.length(); i++) {
JSONObject jsonObject = array.getJSONObject(i);
String id = jsonObject.getString("id");
String vozilo_id = jsonObject.getString("vozilo_id");
String vozac_id = jsonObject.getString("vozac_id");
String pocetna_kilometraza = jsonObject.getString("pocetna_kilometraza");
String pocetno_vreme = jsonObject.getString("pocetno_vreme");
String razlog = jsonObject.getString("razlog");
String zavrsna_kilometraza = jsonObject.getString("zavrsna_kilometraza");
String zavrsno_vreme = jsonObject.getString("zavrsno_vreme");
String moto_sati = jsonObject.getString("moto_sati");
String id_projekat_jb = jsonObject.getString("id_projekat_jb");
ItemModel model = new ItemModel();
model.setVoznja_id(id);
model.setVoziloId(vozilo_id);
model.setVozac_id(vozac_id);
model.setPocetnaKilometraza(pocetna_kilometraza);
model.setPocetnoVreme(pocetno_vreme);
model.setRazlog(razlog);
model.setZavrsnaKilometraza(zavrsna_kilometraza);
model.setZavrsnoVreme(zavrsno_vreme);
model.setMotoSati(moto_sati);
model.setProjekatId(id_projekat_jb);
arrayList.add(model);
}
} catch (JSONException e) {
e.printStackTrace();
}
VoznjaAdapter adapter = new VoznjaAdapter(ListaVoznji.this, arrayList);
listView.setAdapter(adapter);
【问题讨论】：
标签： java android android-listview