mengubah activity ke fragment untuk menggunakan navigation drawer

bagaimana caranya convert activity ke fragment agar dapat menampilkan data pada listview dari json php mysql

seperti ini contoh code saya

package com.andicom.andi;

import android.app.AlertDialog;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
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.RelativeLayout;
import android.widget.Toast;

import com.andicom.andi.adapter.AdapterAdmin;
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 com.andicom.andi.app.AppControllerAdmin;
import com.andicom.andi.data.DataAdmin;
import com.andicom.andi.util.ServerAdmin;

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

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivityAdmin extends  AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener  {

    Toolbar toolbar;
    FloatingActionButton fab;
    ListView list;
    SwipeRefreshLayout swipe;
    List<DataAdmin> itemList = new ArrayList<DataAdmin>();
    AdapterAdmin adapterAdmin;
    int success;
    AlertDialog.Builder dialog;
    LayoutInflater inflater;
    View dialogView;
    EditText txt_id, txt_namapengguna, txt_pass, txt_email;
    String id, namapengguna, pass, email;

    private static final String TAG = MainActivityAdmin.class.getSimpleName();

    private static String url_select     = ServerAdmin.URL + "select.php";
    private static String url_insert     = ServerAdmin.URL + "insert.php";
    private static String url_edit       = ServerAdmin.URL + "edit.php";
    private static String url_update     = ServerAdmin.URL + "update.php";
    private static String url_delete     = ServerAdmin.URL + "delete.php";

    public static final String TAG_ID       = "id";
    public static final String TAG_NAMAPENGGUNA     = "namapengguna";
    public static final String TAG_PASS  = "pass";
    public static final String TAG_EMAIL  = "email";
    private static final String TAG_SUCCESS = "success";
    private static final String TAG_MESSAGE = "message";

    String tag_json_obj = "json_obj_req";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mainadmin);
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        // menghubungkan variablel pada layout dan pada java
        fab     = (FloatingActionButton) findViewById(R.id.fab_add);
        swipe   = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
        list    = (ListView) findViewById(R.id.list);

        // untuk mengisi data dari JSON ke dalam adapterAdmin
        adapterAdmin = new AdapterAdmin(MainActivityAdmin.this, itemList);
        list.setAdapter(adapterAdmin);

        // menamilkan widget refresh
        swipe.setOnRefreshListener(this);

        swipe.post(new Runnable() {
                       @Override
                       public void run() {
                           swipe.setRefreshing(true);
                           itemList.clear();
                           adapterAdmin.notifyDataSetChanged();
                           callVolley();
                       }
                   }
        );

        // fungsi floating action button memanggil form kontak
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogForm("", "", "","", "SIMPAN");
            }
        });

        // listview ditekan lama akan menampilkan dua pilihan edit atau delete data
        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(MainActivityAdmin.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;
            }
        });

    }

    @Override
    public void onRefresh() {
        itemList.clear();
        adapterAdmin.notifyDataSetChanged();
        callVolley();
    }

    // untuk mengosongi edittext pada form
    private void kosong(){
        txt_id.setText(null);
        txt_namapengguna.setText(null);
        txt_pass.setText(null);
        txt_email.setText(null);
    }

    // untuk menampilkan dialog from kontak
    private void DialogForm(String idx, String namax, String passx, String emailx, String button) {
        dialog = new AlertDialog.Builder(MainActivityAdmin.this);
        inflater = getLayoutInflater();
        dialogView = inflater.inflate(R.layout.form_admin, 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_namapengguna    = (EditText) dialogView.findViewById(R.id.txt_namapengguna);
        txt_pass  = (EditText) dialogView.findViewById(R.id.txt_pass);
        txt_email  = (EditText) dialogView.findViewById(R.id.txt_email);

        if (!idx.isEmpty()){
            txt_id.setText(idx);
            txt_namapengguna.setText(namax);
            txt_pass.setText(passx);
            txt_email.setText(emailx);
        } else {
            kosong();
        }

        dialog.setPositiveButton(button, new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                id      = txt_id.getText().toString();
                namapengguna    = txt_namapengguna.getText().toString();
                pass  = txt_pass.getText().toString();
                email  = txt_email.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();
    }

    // untuk menampilkan semua data pada listview
    private void callVolley(){
        itemList.clear();
        adapterAdmin.notifyDataSetChanged();
        swipe.setRefreshing(true);

        // membuat request JSON
        JsonArrayRequest jArr = new JsonArrayRequest(url_select, new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray response) {
                Log.d(TAG, response.toString());

                // Parsing json
                for (int i = 0; i < response.length(); i++) {
                    try {
                        JSONObject obj = response.getJSONObject(i);

                        DataAdmin item = new DataAdmin();

                        item.setId(obj.getString(TAG_ID));
                        item.setNama(obj.getString(TAG_NAMAPENGGUNA));
                        item.setPass(obj.getString(TAG_PASS));
                        item.setEmail(obj.getString(TAG_EMAIL));

                        // menambah item ke array
                        itemList.add(item);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }

                // notifikasi adanya perubahan data pada adapterAdmin
                adapterAdmin.notifyDataSetChanged();

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

            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG, "Error: " + error.getMessage());
                swipe.setRefreshing(false);
            }
        });

        // menambah request ke request queue
        AppControllerAdmin.getInstance().addToRequestQueue(jArr);
    }

    // fungsi untuk menyimpan atau update
    private void simpan_update() {
        String url;
        // jika id kosong maka simpan, jika id ada nilainya maka update
        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);

                    // Cek error node pada json
                    if (success == 1) {
                        Log.d("Add/update", jObj.toString());

                        callVolley();
                        kosong();

                        Toast.makeText(MainActivityAdmin.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show();
                        adapterAdmin.notifyDataSetChanged();

                    } else {
                        Toast.makeText(MainActivityAdmin.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show();
                    }
                } catch (JSONException e) {
                    // JSON error
                    e.printStackTrace();
                }

            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Error: " + error.getMessage());
                Toast.makeText(MainActivityAdmin.this, error.getMessage(), Toast.LENGTH_LONG).show();
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                // Posting parameters ke post url
                Map<String, String> params = new HashMap<String, String>();
                // jika id kosong maka simpan, jika id ada nilainya maka update
                if (id.isEmpty()){
                    params.put("namapengguna", namapengguna);
                    params.put("pass", pass);
                    params.put("email", email);
                } else {
                    params.put("id", id);
                    params.put("namapengguna", namapengguna);
                    params.put("pass", pass);
                    params.put("email", email);
                }

                return params;
            }

        };

        AppControllerAdmin.getInstance().addToRequestQueue(strReq, tag_json_obj);
    }

    // fungsi untuk get edit data
    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);

                    // Cek error node pada json
                    if (success == 1) {
                        Log.d("get edit data", jObj.toString());
                        String idx      = jObj.getString(TAG_ID);
                        String namapenggunax    = jObj.getString(TAG_NAMAPENGGUNA);
                        String passx  = jObj.getString(TAG_PASS);
                        String emailx  = jObj.getString(TAG_EMAIL);

                        DialogForm(idx, namapenggunax, passx, emailx, "UPDATE");

                        adapterAdmin.notifyDataSetChanged();

                    } else {
                        Toast.makeText(MainActivityAdmin.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show();
                    }
                } catch (JSONException e) {
                    // JSON error
                    e.printStackTrace();
                }

            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Error: " + error.getMessage());
                Toast.makeText(MainActivityAdmin.this, error.getMessage(), Toast.LENGTH_LONG).show();
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                // Posting parameters ke post url
                Map<String, String> params = new HashMap<String, String>();
                params.put("id", idx);

                return params;
            }

        };

        AppControllerAdmin.getInstance().addToRequestQueue(strReq, tag_json_obj);
    }

    // fungsi untuk menghapus
    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);

                    // Cek error node pada json
                    if (success == 1) {
                        Log.d("delete", jObj.toString());

                        callVolley();

                        Toast.makeText(MainActivityAdmin.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show();

                        adapterAdmin.notifyDataSetChanged();

                    } else {
                        Toast.makeText(MainActivityAdmin.this, jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show();
                    }
                } catch (JSONException e) {
                    // JSON error
                    e.printStackTrace();
                }

            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Error: " + error.getMessage());
                Toast.makeText(MainActivityAdmin.this, error.getMessage(), Toast.LENGTH_LONG).show();
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                // Posting parameters ke post url
                Map<String, String> params = new HashMap<String, String>();
                params.put("id", idx);

                return params;
            }

        };

        AppControllerAdmin.getInstance().addToRequestQueue(strReq, tag_json_obj);
    }
}

terima kasih