我有一个列表适配器，我设置到列表视图我有一个listview布局和我要合并的适配器。是否有可能在此列表中自动刷新值？
这是我的代码
class VehicleListFragment extends Fragment {
private ProgressDialog pDialog;
private ListView lv;
public static String baseUrl = "http://mark.journeytech.com.ph/mobile_api/";
public static NetworkAPI networkAPI;
public ArrayList<HashMap<String, String>> vehicle = new ArrayList<>();
String a = "";
ArrayList pna;
public interface NetworkAPI {
@POST("vehicle_details.php")
@Headers({"Content-Type:application/json; charset=UTF-8"})
Call<JsonElement> loginRequest(@Body VehicleRequestPojo body);
}
public static class VehicleRequestPojo {
String ucsi_num;
String client_table;
String markutype;
public VehicleRequestPojo(String ucsi_num, String client_table, String markutype) {
this.ucsi_num = ucsi_num;
this.client_table = client_table;
this.markutype = markutype;
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
searchItem.setVisible(false);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MainActivity csActivity;
csActivity = (MainActivity) getActivity();
csActivity.getSupportActionBar().setTitle("Vehicle List");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_vehicle, container, false);
lv = (ListView) v.findViewById(R.id.list);
new GetVehicles().execute();
return v;
}
private class GetVehicles extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
logging.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
httpClient.addInterceptor(logging);
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(baseUrl)
.addConverterFactory(GsonConverterFactory.create())
.client(httpClient.build())
.build();
networkAPI = retrofit.create(NetworkAPI.class);
VehicleRequestPojo loginRequest = new VehicleRequestPojo(MainActivity.ucsi_num, client_table, markutype);
Call<JsonElement> call = networkAPI.loginRequest(loginRequest);
call.enqueue(new Callback<JsonElement>() {
@Override
public void onResponse(Call<JsonElement> call, Response<JsonElement> response) {
// success response
if (response.body().isJsonArray()) {
JsonArray objectWhichYouNeed = response.body().getAsJsonArray();
System.out.println(objectWhichYouNeed);
for (int i = 0; i < response.body().getAsJsonArray().size(); i++) {
JsonElement je = response.body().getAsJsonArray().get(i);
JsonObject jo = je.getAsJsonObject();
String plate_n = jo.get("plate_num").toString();
String plate_nString = plate_n;
plate_nString = plate_nString.replace("\"", "");
String plate_num = String.valueOf(plate_nString);
String gps_n = jo.get("gps_num").toString();
String gps_nString = gps_n;
gps_nString = gps_nString.replace("\"", "");
String gps_num = String.valueOf(gps_nString);
String locat = jo.get("location").toString();
String locatString = locat;
locatString = locatString.replace("\"", "");
String location = String.valueOf(locatString);
String da = jo.get("date").toString();
String daString = da;
daString = daString.replace("\"", "");
String date = String.valueOf(daString);
String ti = jo.get("time").toString();
String tiString = ti;
tiString = tiString.replace("\"", "");
String time = String.valueOf(tiString);
String lati = jo.get("lat").toString();
String latiString = lati;
latiString = latiString.replace("\"", "");
String lat = String.valueOf(latiString);
String longi = jo.get("lng").toString();
String longiString = longi;
longiString = longiString.replace("\"", "");
String lng = String.valueOf(longiString);
String en = jo.get("engine").toString();
String enString = en;
enString = enString.replace("\"", "");
String engine = String.valueOf(enString);
String re = jo.get("remarks").toString();
String reString = re;
reString = reString.replace("\"", "");
String remarks = String.valueOf(reString);
if (lat != null && !lat.equals("null") || (lng != null && !lng.equals("null"))) {
// tmp hash map for detail [single]
HashMap<String, String> details = new HashMap<>();
// adding each child node to HashMap key => value
details.put("plate_num", plate_num);
details.put("gps_num", gps_num);
details.put("location", location);
details.put("date", date);
details.put("time", time);
details.put("lat", lat);
details.put("lng", lng);
details.put("engine", engine);
details.put("remarks", remarks);
a = details.get("date");
// adding vehicle to vehicle list
vehicle.add(details);
/**
* Updating parsed JSON data into ListView
* */
final ListAdapter adapter = new SimpleAdapter(getContext(), vehicle,
R.layout.list_vehicle, new String[]{"plate_num",
"location", "date", "time", "lat", "lng", "engine",
"remarks",},
new int[]{R.id.plate_num, R.id.location, R.id.date, R.id.time, R.id.latitude, R.id.longitude,
R.id.engine, R.id.remarks});
// lv.setAdapter(adapter);
lv.invalidateViews();
lv.refreshDrawableState();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View v, int position, long l) {
TextView plate_n = (TextView) v.findViewById(R.id.plate_num);
TextView dat = (TextView) v.findViewById(R.id.date);
TextView tim = (TextView) v.findViewById(R.id.time);
TextView loc = (TextView) v.findViewById(R.id.location);
TextView lat = (TextView) v.findViewById(R.id.latitude);
TextView lng = (TextView) v.findViewById(R.id.longitude);
TextView eng = (TextView) v.findViewById(R.id.engine);
TextView rem = (TextView) v.findViewById(R.id.remarks);
String plate_num = plate_n.getText().toString();
String date = dat.getText().toString();
String time = tim.getText().toString();
String location = loc.getText().toString();
String latitude = lat.getText().toString();
String longitude = lng.getText().toString();
String engine = eng.getText().toString();
String remarks = rem.getText().toString();
Bundle bundle = new Bundle();
bundle.putString("plate_num", plate_num);
bundle.putString("date", date);
bundle.putString("time", time);
bundle.putString("location", location);
bundle.putString("latitude", latitude);
bundle.putString("longitude", longitude);
bundle.putString("engine", engine);
bundle.putString("remarks", remarks);
if ((!latitude.equals("") && latitude != null) || (!longitude.equals("") && longitude != null)) {
Fragment mFragment = new VehicleListMapFragment(getActivity(), getActivity());
getFragmentManager().beginTransaction().addToBackStack("sd").replace(R.id.mainLayout, mFragment).commit();
mFragment.setArguments(bundle);
} else {
Toast.makeText(getContext(), "Invalid Data.", Toast.LENGTH_LONG).show();
}
}
});
}
}
} else {
System.out.println("Not a JSONArray.");
}
}
@Override
public void onFailure(Call<JsonElement> call, Throwable t) {
// failure response
System.out.println(call.toString());
}
});
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
}
}
}
另外，我有这个
Fragment mFragment = new VehicleListMapFragment(getActivity(), getActivity());
getFragmentManager().beginTransaction().addToBackStack("sd").replace(R.id.mainLayout, mFragment).commit();
转到下一个片段，我只是使用该代码替换布局。每当我转到下一个片段并按下后退按钮时，此布局上的值会加倍。你能来吗？解释这个解决方案？非常感谢您的回答！
答案 0 :(得分：1)
在添加对象之前清除车辆 ArrayList。
vehicle.clear();
然后，
vehicle.add(details);
并使用adapter.notifyDataSetChanged();您想要刷新您的ListView