MainActivity.java

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.training.android.wisata.R;
import com.training.android.wisata.app.AppController;
import com.training.android.wisata.entity.User;
import com.training.android.wisata.utility.CustomRequest;
import com.training.android.wisata.utility.Utilities;

import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    User user;
    Utilities util = new Utilities();
    String url = util.getUrl("location.php");

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

        user = new User();
        if (!user.isLogin(getApplicationContext())){
            startActivity(new Intent(getApplicationContext(),Login.class));
            finish();
        }

        getLocation();
    }

    private void getLocation() {
        Map<String, String> params = new HashMap<>();
        params.put("category", "place");

        CustomRequest jsonObj = new CustomRequest(Request.Method.POST, url, params,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        Log.d("MainActivity", response.toString());
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });
        AppController.getInstance().addToRequestQueue(jsonObj);
    }
}