在位置数据更新后，我在recyclerview中获得了重复的数据项
我尝试了一些这样的方式 NotifyDataSetChanged（）和setHasStableIds（true） 但仍然没有成功
public class FragmentPetaniTerdekat extends Fragment {
Context context;
View view;
Dialog dialog;
Session session;
RecyclerView recyclerView;
ArrayList<String> nama = new ArrayList<>();
ArrayList<String> jenis = new ArrayList<>();
ArrayList<String> jarak = new ArrayList<>();
ArrayList<String> durasi = new ArrayList<>();
String my_location;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = getContext();
dialog = new Dialog(context);
session = new Session(context);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.fragment_petani, container, false);
location();
return view;
}
// get adddres name current location
private void location() {
LocationListener mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
// get lat and lng
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
my_location = String.valueOf(lat+","+lng);
session.setSession(my_location);
getApi(session.getSesssion());
}else{
getApi(session.getSesssion());
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
LocationManager mLocationManager = (LocationManager) getActivity().getSystemService(LOCATION_SERVICE);
if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return ;
}
// check alternative get location
boolean GPS_ENABLE, NETWORK_ENABLE;
GPS_ENABLE = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
NETWORK_ENABLE = mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (GPS_ENABLE){
dialog.showDialog("Pesan","memuat data...",true);
Toast.makeText(getActivity(),"GPS state",Toast.LENGTH_LONG).show();
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000 * 5 * 1 , 1, mLocationListener);
}else if(NETWORK_ENABLE){
Toast.makeText(getActivity(),"network state",Toast.LENGTH_LONG).show();
mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1, 1,mLocationListener);
}else{
Toast.makeText(getActivity(),"ganok seng kepilih cak",Toast.LENGTH_LONG).show();
showSettingsAlert();
}
}
// show alert setting if gps non aktif
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(getActivity());
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
getActivity().startActivity(intent);
}
});
// Showing Alert Message
alertDialog.show();
}
public void initRecylerView(View v){
recyclerView = (RecyclerView)v.findViewById(R.id.recylerview_petani_terdekat);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(context);
recyclerView.setLayoutManager(layoutManager);
RecyclerView.Adapter adapter = new AdapterPetaniTerdekat(context,nama,jarak,durasi);
// adapter.notifyDataSetChanged();
// adapter.setHasStableIds(true);
recyclerView.setAdapter(adapter);
}
public void getApi(final String my_location){
dialog.message("lokasi : "+my_location);
StringRequest request = new StringRequest(Request.Method.POST, URL_PETANI_TERDEKAT, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (response != null) {
try {
JSONObject get_respone = new JSONObject(response);
JSONArray get_result = get_respone.getJSONArray("result_petani_terdekat");
for (int i=0; i<get_result.length(); i++){
JSONObject result = get_result.getJSONObject(i);
ModelPetaniTerdekat petaniTerdekat = new ModelPetaniTerdekat();
petaniTerdekat.setNama(result.getString("nama"));
JSONObject kriteria = result.getJSONObject("jarak");
for (int z=0; z<kriteria.length(); z++){
petaniTerdekat.setJarak(kriteria.getString("distance"));
petaniTerdekat.setDurasi(kriteria.getString("duration"));
}
nama.add(petaniTerdekat.getNama());
jarak.add(petaniTerdekat.getJarak());
durasi.add(petaniTerdekat.getDurasi());
dialog.closeDialog();
}
initRecylerView(view);
} catch (JSONException e) {
dialog.message("Error : "+e.toString());
e.printStackTrace();
}
}else{
dialog.message("Error : Tidak ada data !");
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error instanceof TimeoutError || error instanceof NoConnectionError) {
dialog.message("Error : TimeoutError");
} else if (error instanceof AuthFailureError) {
dialog.message("Error : AuthFailureError");
} else if (error instanceof ServerError) {
dialog.message("Error : ServerError");
} else if (error instanceof NetworkError) {
dialog.message("Error : NetworkError");
} else if (error instanceof ParseError) {
error.printStackTrace();
dialog.message("Error : ParseError");
}
dialog.closeDialog();
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String,String> map = new HashMap<>();
map.put("lokasi_saya",my_location);
return map;
}
};
AppSingleton.getInstance(context).addToRequestQueue(request);
request.setRetryPolicy(new DefaultRetryPolicy(
60000,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
}
}
和我的适配器
public class AdapterPetaniTerdekat extends RecyclerView.Adapter<AdapterPetaniTerdekat.ViewHolderCabe> {
Context context;
ArrayList<String> nama = new ArrayList<>();
ArrayList<String> jarak = new ArrayList<>();
ArrayList<String> durasi = new ArrayList<>();
public AdapterPetaniTerdekat(Context context, ArrayList<String> nama, ArrayList<String> jarak, ArrayList<String> durasi) {
this.context = context;
this.nama = nama;
this.jarak = jarak;
this.durasi = durasi;
}
@Override
public ViewHolderCabe onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.rows_petani_terdekat,parent,false);
return new ViewHolderCabe(view);
}
@Override
public void onBindViewHolder(ViewHolderCabe holder, int position) {
holder.tv_nama.setText(nama.get(position));
holder.tv_jarak.setText(jarak.get(position));
holder.tv_durasi.setText(durasi.get(position));
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemCount() {
return nama.size();
}
public class ViewHolderCabe extends RecyclerView.ViewHolder{
TextView tv_nama, tv_jarak, tv_durasi;
public ViewHolderCabe(View itemView) {
super(itemView);
tv_nama = (TextView)itemView.findViewById(R.id.tv_nama_petani);
tv_jarak = (TextView)itemView.findViewById(R.id.tv_jarak);
tv_durasi = (TextView)itemView.findViewById(R.id.tv_durasi);
}
}
}
答案 0 :(得分：1)
在FragmentPetaniTerdekat中添加以下方法以检查duplicate条目：
public boolean isExist(String strNama) {
for (int i = 0; i < nama.size(); i++) {
if (nama.get(i).equals(strNama)) {
return true;
}
}
return false;
}
在将字符串添加到列表（onResponse()）之前，在nama, jarak, durasi中使用此方法：
@Override
public void onResponse(String response) {
if (response != null) {
try {
..............
..................
for (int i = 0; i < get_result.length(); i++){
JSONObject result = get_result.getJSONObject(i);
ModelPetaniTerdekat petaniTerdekat = new ModelPetaniTerdekat();
petaniTerdekat.setNama(result.getString("nama"));
JSONObject kriteria = result.getJSONObject("jarak");
for (int z=0; z<kriteria.length(); z++){
petaniTerdekat.setJarak(kriteria.getString("distance"));
petaniTerdekat.setDurasi(kriteria.getString("duration"));
}
boolean isExist = isExist(petaniTerdekat.getNama());
if (!isExist) { // Not exist, Add now
nama.add(petaniTerdekat.getNama());
jarak.add(petaniTerdekat.getJarak());
durasi.add(petaniTerdekat.getDurasi());
}
dialog.closeDialog();
}
initRecylerView(view);
} catch (JSONException e) {
dialog.message("Error : "+e.toString());
e.printStackTrace();
}
}else{
dialog.message("Error : Tidak ada data !");
}
}
希望这会有所帮助〜