code json

package smpnegeri8.toms.siakadsmpn8;

import android.app.ProgressDialog;
import android.os.Handler;
import android.support.v4.view.MenuItemCompat;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.SearchView;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AbsListView;
import android.widget.ListView;
import android.widget.Toast;

import com.android.volley.RequestQueue;
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.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

import smpnegeri8.toms.siakadsmpn8.functional.Adapter;
import smpnegeri8.toms.siakadsmpn8.functional.AppController;
import smpnegeri8.toms.siakadsmpn8.functional.URL_TAMPIL_DATA;
import smpnegeri8.toms.siakadsmpn8.functional.set_dataSiswa;


public class Data_SiswaActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener, SearchView.OnQueryTextListener{

    ProgressDialog pDialog;
    List<set_dataSiswa> listData = new ArrayList<set_dataSiswa>();
    Adapter adapter;
    SwipeRefreshLayout swipe;
    ListView list_view;

    private static String url_list = URL_TAMPIL_DATA.URL + "Json_data_siswa.php?offset=";
    private int offSet = 0;
    int no;
    Handler handler;
    Runnable runnable;

    //public static final String URL_TAMPIL_DATA = "http://smpn8-pky.tk/siakad/Json_data_siswa.php";
    public static final String URL_CARI_DATA = "http://10.0.2.2/android/kuncoro_search_view/cari_data.php";

    private static final String TAG = Data_SiswaActivity.class.getSimpleName();
    public static final String TAG_NO = "no";
    public static final String TAG_ID = "id";
    public static final String TAG_NAMA = "nama_siswa";
    public static final String TAG_JK = "jk";
    public static final String TAG_NISN = "nisn";
    public static final String TAG_TPT_LAHIR = "tpt_lahir";
    public static final String TAG_TGL_LAHIR = "tgl_lahir";
    public static final String TAG_AGAMA = "agama";
    public static final String TAG_ALAMAT = "alamat";
    public static final String TAG_KELURAHAN = "kalurahan";
    public static final String TAG_KECAMATAN = "kecamatan";
    public static final String TAG_NM_AYAH = "nm_ayah";
    public static final String TAG_NM_IBU = "nm_ibu";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_data_siswa);

        swipe = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh);
        list_view = (ListView) findViewById(R.id.list_view_siswa);
        adapter = new Adapter(Data_SiswaActivity.this, listData);
        list_view.setAdapter(adapter);
        swipe.setOnRefreshListener(this);
        swipe.post(new Runnable() {
                       @Override
                       public void run() {
                           swipe.setRefreshing(true);
                           listData.clear();
                           adapter.notifyDataSetChanged();
                           callData(0);
                       }
                   }
        );

        list_view.setOnScrollListener(new AbsListView.OnScrollListener() {
            private int currentVisibleItemCount;
            private int currentScrollState;
            private int currentFirstVisibleItem;
            private int totalItem;
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                this.currentScrollState = scrollState;
                this.isScrollCompleted();
            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                this.currentFirstVisibleItem = firstVisibleItem;
                this.currentVisibleItemCount = visibleItemCount;
                this.totalItem = totalItemCount;
            }
            private void isScrollCompleted() {
                if (totalItem - currentFirstVisibleItem == currentVisibleItemCount
                        && this.currentScrollState == SCROLL_STATE_IDLE) {

                    swipe.setRefreshing(true);
                    handler = new Handler();

                    runnable = new Runnable() {
                        public void run() {
                            callData(offSet);
                        }
                    };

                    handler.postDelayed(runnable, 3000);
                }
            }
        });
    }
    @Override
    public void onRefresh() {
        listData.clear();
        adapter.notifyDataSetChanged();
        callData(0);
    }
    private  void  callData(int page) {
        swipe.setRefreshing(true);
        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(url_list + page, new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray response) {
                Log.e(TAG, response.toString());
                if (response.length() > 0){
                    for (int i = 0; i < response.length(); i++) {

/*                        JSONObject obj = null;
                        set_dataSiswa item = new set_dataSiswa();*/
                        try {
                            JSONObject obj = response.getJSONObject(i);
                            set_dataSiswa item = new set_dataSiswa();
//                            obj = response.getJSONObject(i);
                            no = obj.getInt(TAG_NO);
                            item.setId(obj.getInt(TAG_ID));
                            item.setNama_siswa(obj.getString(TAG_NAMA));
                            item.setJk(obj.getString(TAG_JK));
                            item.setNisn(obj.getString(TAG_NISN));
                            item.setTpt_lahir(obj.getString(TAG_TPT_LAHIR));
                            item.setTgl_lahir(obj.getString(TAG_TGL_LAHIR));
                            item.setAgama(obj.getString(TAG_AGAMA));
                            item.setAlamat(obj.getString(TAG_ALAMAT));
                            item.setKelurahan(obj.getString(TAG_KELURAHAN));
                            item.setKecamatan(obj.getString(TAG_KECAMATAN));
                            item.setNm_ayah(obj.getString(TAG_NM_AYAH));
                            item.setNm_ibu(obj.getString(TAG_NM_IBU));


                            listData.add(item);

                            if (no > offSet)
                                offSet = no;

                            Log.e(TAG, "offSet " + offSet);
                        } catch (JSONException e) {
                            Log.e(TAG, "JSON Parsing error: " + e.getMessage());
                        }
                        adapter.notifyDataSetChanged();
                    }

                }
                swipe.setRefreshing(false);
            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e("VOLLEY POST","ERROR in post response"+error.getMessage());
                Toast.makeText(Data_SiswaActivity.this, error.getMessage(), Toast.LENGTH_LONG).show();
                swipe.setRefreshing(false);
            }
        });
        // Adding request to request queue
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(jsonArrayRequest);
    }


    @Override
    public boolean onQueryTextSubmit(String query) {
        return false;
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        return false;
    }

    @Override
    public boolean onCreateOptionsMenu(android.view.Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);
        final MenuItem item = menu.findItem(R.id.action_search);
        final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
        searchView.setQueryHint(getString(R.string.type_name));
        searchView.setIconified(true);
        searchView.setOnQueryTextListener(this);
        return true;
    }
}