Android - cannot find symbol method getSystemService(String)

Question

Im new in java/android, im trying make fragment activity and implement adapter into my fragment 'tab2' but getting eror code in line(adapter.java) :

inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

im already trying to fix. but still cant resolve this. So, what is wrong in my code? this my full code adapter.java :`

 package com.yoga1215051164.fragment2.adapter; /** * Created by Yatogami on 24/05/2017. */ import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import com.yoga1215051164.fragment2.R; import com.yoga1215051164.fragment2.data.Data; import com.yoga1215051164.fragment2.tab2; import java.util.List; public class Adapter extends BaseAdapter { private tab2 activity; private LayoutInflater inflater; private List<Data> items; public Adapter(tab2 activity, List<Data> items) { this.activity = activity; this.items = items; } @Override public int getCount() { return items.size(); } @Override public Object getItem(int location) { return items.get(location); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (inflater == null) inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); if (convertView == null) convertView = inflater.inflate(R.layout.list_row, null); TextView id = (TextView) convertView.findViewById(R.id.id); TextView nama = (TextView) convertView.findViewById(R.id.nama); TextView alamat = (TextView) convertView.findViewById(R.id.alamat); Data data = items.get(position); id.setText(data.getId()); nama.setText(data.getNama()); alamat.setText(data.getAlamat()); return convertView; } } 

and this code fragment tab2.java :

 package com.yoga1215051164.fragment2; /** * Created by Yatogami on 25/05/2017. */ import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.design.widget.FloatingActionButton; import android.support.v4.app.Fragment; import android.support.v4.widget.SwipeRefreshLayout; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.EditText; import android.widget.ListView; import android.widget.Toast; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import com.yoga1215051164.fragment2.adapter.Adapter; import com.yoga1215051164.fragment2.app.AppController; import com.yoga1215051164.fragment2.data.Data; import com.yoga1215051164.fragment2.util.Server; import com.android.volley.Request; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.VolleyLog; import com.android.volley.toolbox.JsonArrayRequest; import com.android.volley.toolbox.StringRequest; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class tab2 extends Fragment implements SwipeRefreshLayout.OnRefreshListener{ FloatingActionButton fab; ListView list; SwipeRefreshLayout swipe; List<Data> itemList = new ArrayList<Data>(); Adapter adapter; int success; AlertDialog.Builder dialog; LayoutInflater inflater; View dialogView; EditText txt_id, txt_nama, txt_alamat; String id, nama, alamat; private static final String TAG = tab2.class.getSimpleName(); private static String url_select = Server.URL + "select.php"; private static String url_insert = Server.URL + "insert.php"; private static String url_edit = Server.URL + "edit.php"; private static String url_update = Server.URL + "update.php"; private static String url_delete = Server.URL + "delete.php"; public static final String TAG_ID = "id"; public static final String TAG_NAMA = "nama"; public static final String TAG_ALAMAT = "alamat"; private static final String TAG_SUCCESS = "success"; private static final String TAG_MESSAGE = "message"; String tag_json_obj = "json_obj_req"; @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View v =inflater.inflate(R.layout.tabmenu2,container,false); super.onCreate(savedInstanceState); fab = (FloatingActionButton) v.findViewById(R.id.fab_add); swipe = (SwipeRefreshLayout) v.findViewById(R.id.swipe_refresh_layout); list = (ListView) v.findViewById(R.id.list); adapter = new Adapter(tab2.this, itemList); list.setAdapter(adapter); swipe.setOnRefreshListener(this); swipe.post(new Runnable() { @Override public void run() { swipe.setRefreshing(true); itemList.clear(); adapter.notifyDataSetChanged(); callVolley(); } } ); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { DialogForm("", "", "", "SIMPAN"); } }); list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(final AdapterView<?> parent, View view, final int position, long id) { // TODO Auto-generated method stub final String idx = itemList.get(position).getId(); final CharSequence[] dialogitem = {"Edit", "Delete"}; dialog = new AlertDialog.Builder(tab2.this); dialog.setCancelable(true); dialog.setItems(dialogitem, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub switch (which) { case 0: edit(idx); break; case 1: delete(idx); break; } } }).show(); return false; } }); return v; } @Override public void onRefresh() { itemList.clear(); adapter.notifyDataSetChanged(); callVolley(); } private void kosong(){ txt_id.setText(null); txt_nama.setText(null); txt_alamat.setText(null); } private void DialogForm(String idx, String namax, String alamatx, String button) { dialog = new AlertDialog.Builder(tab2.this); inflater = getLayoutInflater(); dialogView = inflater.inflate(R.layout.form_biodata, null); dialog.setView(dialogView); dialog.setCancelable(true); dialog.setIcon(R.mipmap.ic_launcher); dialog.setTitle("Form Biodata"); txt_id = (EditText) dialogView.findViewById(R.id.txt_id); txt_nama = (EditText) dialogView.findViewById(R.id.txt_nama); txt_alamat = (EditText) dialogView.findViewById(R.id.txt_alamat); if (!idx.isEmpty()){ txt_id.setText(idx); txt_nama.setText(namax); txt_alamat.setText(alamatx); } else { kosong(); } dialog.setPositiveButton(button, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { id = txt_id.getText().toString(); nama = txt_nama.getText().toString(); alamat = txt_alamat.getText().toString(); simpan_update(); dialog.dismiss(); } }); dialog.setNegativeButton("BATAL", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); kosong(); } }); dialog.show(); } private void callVolley(){ itemList.clear(); adapter.notifyDataSetChanged(); swipe.setRefreshing(true); JsonArrayRequest jArr = new JsonArrayRequest(url_select, new Response.Listener<JSONArray>() { @Override public void onResponse(JSONArray response) { Log.d(TAG, response.toString()); for (int i = 0; i < response.length(); i++) { try { JSONObject obj = response.getJSONObject(i); Data item = new Data(); item.setId(obj.getString(TAG_ID)); item.setNama(obj.getString(TAG_NAMA)); item.setAlamat(obj.getString(TAG_ALAMAT)); itemList.add(item); } catch (JSONException e) { e.printStackTrace(); } } adapter.notifyDataSetChanged(); swipe.setRefreshing(false); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { VolleyLog.d(TAG, "Error: " + error.getMessage()); swipe.setRefreshing(false); } }); AppController.getInstance().addToRequestQueue(jArr); } private void simpan_update() { String url; if (id.isEmpty()){ url = url_insert; } else { url = url_update; } StringRequest strReq = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() { @Override public void onResponse(String response) { Log.d(TAG, "Response: " + response.toString()); try { JSONObject jObj = new JSONObject(response); success = jObj.getInt(TAG_SUCCESS); if (success == 1) { Log.d("Add/update", jObj.toString()); callVolley(); kosong(); Toast.makeText(tab2.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show(); adapter.notifyDataSetChanged(); } else { Toast.makeText(tab2.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show(); } } catch (JSONException e) { e.printStackTrace(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e(TAG, "Error: " + error.getMessage()); Toast.makeText(tab2.this, error.getMessage(), Toast.LENGTH_LONG).show(); } }) { @Override protected Map<String, String> getParams() { Map<String, String> params = new HashMap<String, String>(); if (id.isEmpty()){ params.put("nama", nama); params.put("alamat", alamat); } else { params.put("id", id); params.put("nama", nama); params.put("alamat", alamat); } return params; } }; AppController.getInstance().addToRequestQueue(strReq, tag_json_obj); } private void edit(final String idx){ StringRequest strReq = new StringRequest(Request.Method.POST, url_edit, new Response.Listener<String>() { @Override public void onResponse(String response) { Log.d(TAG, "Response: " + response.toString()); try { JSONObject jObj = new JSONObject(response); success = jObj.getInt(TAG_SUCCESS); if (success == 1) { Log.d("get edit data", jObj.toString()); String idx = jObj.getString(TAG_ID); String namax = jObj.getString(TAG_NAMA); String alamatx = jObj.getString(TAG_ALAMAT); DialogForm(idx, namax, alamatx, "UPDATE"); adapter.notifyDataSetChanged(); } else { Toast.makeText(tab2.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show(); } } catch (JSONException e) { e.printStackTrace(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e(TAG, "Error: " + error.getMessage()); Toast.makeText(tab2.this, error.getMessage(), Toast.LENGTH_LONG).show(); } }) { @Override protected Map<String, String> getParams() { Map<String, String> params = new HashMap<String, String>(); params.put("id", idx); return params; } }; AppController.getInstance().addToRequestQueue(strReq, tag_json_obj); } private void delete(final String idx){ StringRequest strReq = new StringRequest(Request.Method.POST, url_delete, new Response.Listener<String>() { @Override public void onResponse(String response) { Log.d(TAG, "Response: " + response.toString()); try { JSONObject jObj = new JSONObject(response); success = jObj.getInt(TAG_SUCCESS); if (success == 1) { Log.d("delete", jObj.toString()); callVolley(); Toast.makeText(tab2.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show(); adapter.notifyDataSetChanged(); } else { Toast.makeText(tab2.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show(); } } catch (JSONException e) { e.printStackTrace(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e(TAG, "Error: " + error.getMessage()); Toast.makeText(tab2.this, error.getMessage(), Toast.LENGTH_LONG).show(); } }) { @Override protected Map<String, String> getParams() { Map<String, String> params = new HashMap<String, String>(); params.put("id", idx); return params; } }; AppController.getInstance().addToRequestQueue(strReq, tag_json_obj); } } 

Thankyou

Answer 1

You have to pass the context to your adapter so your adapter should look like this

private Context context;
public Adapter(Context context, List<Data> items) {
        this.context=context
        this.items = items;
    }

and use this context like this

inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

and send context from your fragment like this

Adapter adapter=new Adapter(getActivity(),listItems);

Answer 2

Fragment does not extend Context that is why you cannot call getSystemService . Instead of passing the fragment instance, pass the context from the fragment's host activity. It is advisable to instantiate the Adapter in Fragment.onAttach() since you are sure that the context is valid. And also, use

LayoutInflater.from(context);

if you want to get an instance of the inflater.