MainActivity

package com.example.robot.fastboatd;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.icu.util.Calendar;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.ImageButton;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

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

import java.util.ArrayList;
import java.util.HashMap;

public class MainActivity extends AppCompatActivity {

    public Button btn1,btn2,btn3;
    public String masukan1;
    public String masukan2;
    private DatePicker datePicker;
    private Calendar calendar;
    public String y,x,url;
    public AlertDialog.Builder builder;

    private String TAG = MainActivity.class.getSimpleName();

    private ProgressDialog pDialog;
    private ListView lv;
    ArrayList<HashMap<String, String>> dataList;

    ImageButton img;
    protected void onCreate(Bundle savedInstanceState) {
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn1 = (Button) findViewById(R.id.button1);
        btn2 = (Button) findViewById(R.id.button2);
        btn3 = (Button) findViewById(R.id.button3);
        img = (ImageButton) findViewById(R.id.imageButton);
        final CharSequence[] items = {"Lombok", "bali", "gili trawangan", "gili air", "gili meno", "nusa lembongan"};
        builder = new AlertDialog.Builder(MainActivity.this);
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                        builder.setTitle("Arrive");
                        builder.setItems(items, new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int item) {
                                btn1.setText(items[item]);
                                masukan1 = items[item].toString();
                                seturl();
                            }
                        }).show();
            }
        });
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                builder.setTitle("Depart");
                builder.setItems(items, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int item) {
                        masukan2 = items[item].toString();
                        btn2.setText(items[item]);
                        seturl();
                    }
                }).show();
            }
        });

        img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent a = new Intent(MainActivity.this, perc.class);
                startActivity(a);
            }
        });
        btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setContentView(R.layout.semogafix);
                dataList = new ArrayList<>();

                lv = (ListView) findViewById(R.id.list);


                new GetContacts().execute();
            }
        });

    }
    public class GetContacts extends AsyncTask<Void, Void, Void> {


        @Override
        public void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Please wait...");
            pDialog.setCancelable(true);

            pDialog.show();

        }

        @Override
        protected Void doInBackground(Void... arg0) {
            HttpHandler sh = new HttpHandler();

            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url);

            Log.e(TAG, "Response from url: " + jsonStr);

            if (jsonStr != null) {
                try {
                    JSONObject jsonObj = new JSONObject(jsonStr);

                    // Getting JSON Array node
                    JSONArray contacts = jsonObj.getJSONArray("results");

                    // looping through All Contacts
                    for (int i = 0; i < contacts.length(); i++) {
                        JSONObject c = contacts.getJSONObject(i);
                        String boat = c.getString("boat");
                        for (int y = 0; y < contacts.length(); y++) {
                            JSONObject d = contacts.getJSONObject(y);
                            String bot = d.getString("boat");
                            if (boat == bot) {
                                boat = c.getString("boat");
                                String name = c.getString("agent");
                                String price = c.getString("price");


                                HashMap<String, String> contact = new HashMap<>();

                                contact.put("boat", boat);
                                contact.put("name", name);
                                contact.put("price", price);

                                dataList.add(contact);
                            }
                        }
                    }

                } catch (final JSONException e) {
                    Log.e(TAG, "Json parsing error: " + e.getMessage());
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(getApplicationContext(),
                                    "Json parsing error: " + e.getMessage(),
                                    Toast.LENGTH_LONG)
                                    .show();
                        }
                    });

                }
            } else {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Koneksi Internet tidak ditemukan, silahkan aktifkan koneksi anda dan coba kembali",
                                Toast.LENGTH_LONG)
                                .show();
                    }
                });

            }

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            // Dismiss the progress dialog
            if (pDialog.isShowing())
                pDialog.dismiss();
            /**
             * Updating parsed JSON data into ListView
             * */
            ListAdapter adapter = new SimpleAdapter(
                    MainActivity.this, dataList,
                    R.layout.list_item, new String[]{"name",
                    "boat","price"}, new int[]{R.id.boat,
                    R.id.agent, R.id.price});

            lv.setAdapter(adapter);
        }

    }
    public void seturl(){
        url = "http://api.lrsoft.id/boat-price/v1/gets?depart="+masukan1+"&arrive="+masukan2;
    }
}