Tukukkk

im using android studio for a school project and im in the final stages now. the only thing i have left is for one class that has 2 spinners, one determining the program, and the other determining the semester, and a button that will then take those two spinners and spit out a URL pertaining to the schedule of that program and semester. The problem is, i dont know how to then take that spit out URL, and parse it into the other java class that displays a schedule. Below you will find the code attached, that works but doesnt display the correct schedule(since its hardcoded)

   StringBuffer sb = new StringBuffer();

                sb.append("http://branko-cirovic.appspot.com/etcapp/timetables/timetable_"); sb.append(cid); sb.append(semester); sb.append(".xml");

                loc = sb.toString();



                Toast.makeText(ScheduleMainActivity.this,"You Selected : "

                        + loc, Toast.LENGTH_SHORT).show();



                Intent toy7 = new Intent(ScheduleMainActivity.this, TimetableMainActivity.class);

                toy7.putExtra("Name", loc);

                startActivity(toy7);

That is the activity where im creating the intent and using the putExtra to use the data in the next activity

 public class GetXML extends AsyncTask<String, Void, String> {

    String src = null;

    String loc = (String) getIntent().getExtras().get("Name");



    @Override

    protected String doInBackground(String... params) {

        try {

            URL url = new URL(loc);

            HttpURLConnection con = (HttpURLConnection) url.openConnection();

            src = readStream(con.getInputStream());



        } catch (Exception e) {

            e.printStackTrace();

        }



        return src;

    }



    @Override

    protected void onPostExecute(String result) {

        if (src == null)

            new AlertDialog.Builder(TimetableMainActivity.this).

                    setTitle("Error").setMessage("No Schedule Found").

                    setNeutralButton("Close", null).show();

        else {

            parseXML(src);

        }



        setContentView(R.layout.activity_main_timetable);



        days = new String[5][10];

        for (int i = 0; i < 5; i++) {

            for (int j = 0; j < 10; j++) {

                int k = i * 10 + j;

                days[i][j] = schedule.get(k);

            }

        }



        for (int i = 0; i < 5; i++)

            list[i] = new ArrayList<Map<String, String>>();



        int count = hours.length;



        for (int j = 0; j < 5; j++) {

            for (int i = 0; i < count; i++) {

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

                map.put("time", hours[i]);

                map.put("description", days[j][i]);

                list[j].add(map);

            }

        }



        Calendar cal = Calendar.getInstance();

        int today = cal.get(Calendar.DAY_OF_WEEK) - 2;



        pos = 0;

        if (today >= 0 && today <= 4)

            pos = today;



        ViewPager viewPager = findViewById(R.id.ViewPager);

        CustomPagerAdapter adapter = new CustomPagerAdapter(TimetableMainActivity.this, list);

        PagerTabStrip pagerTabStrip = findViewById(R.id.pager_tab);



        int color = Color.parseColor("#33b7ee");

        pagerTabStrip.setTabIndicatorColor(color);



        viewPager.setAdapter(adapter);

        viewPager.setCurrentItem(pos);

    }

This is where im getting an error. Im getting an IndexOut of bounds error and the app is crashing

2018-11-20 22:35:19.126 20681-20681/com.example.mr_ru.listview E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.example.mr_ru.listview, PID: 20681

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

    at java.util.ArrayList.get(ArrayList.java:437)

    at com.example.mr_ru.listview.TimetableMainActivity$GetXML.onPostExecute(TimetableMainActivity.java:100)

    at com.example.mr_ru.listview.TimetableMainActivity$GetXML.onPostExecute(TimetableMainActivity.java:66)

    at android.os.AsyncTask.finish(AsyncTask.java:695)

    at android.os.AsyncTask.access$600(AsyncTask.java:180)

    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)

    at android.os.Handler.dispatchMessage(Handler.java:106)

    at android.os.Looper.loop(Looper.java:193)

    at android.app.ActivityThread.main(ActivityThread.java:6669)

    at java.lang.reflect.Method.invoke(Native Method)

    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

This is the error btw