Java tutorial
package com.spacejake.jake.ultimatepurduediner; import android.app.ActionBar; import android.app.Activity; import android.app.AlertDialog; import android.app.DialogFragment; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.support.v4.widget.DrawerLayout; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ListView; import android.widget.Spinner; import java.net.MalformedURLException; import java.net.URL; import java.text.SimpleDateFormat; import java.util.Calendar; /*This file is part of UltimatePurdueDiner. UltimatePurdueDiner is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. UltimatePurdueDiner is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with UltimatePurdueDiner. If not, see <http://www.gnu.org/licenses/>. */ public class MainActivity extends Activity implements NavigationDrawerFragment.NavigationDrawerCallbacks { /** * Fragment managing the behaviors, interactions and presentation of the navigation drawer. */ private NavigationDrawerFragment mNavigationDrawerFragment; /** * Used to store the last screen title. For use in {@link #restoreActionBar()}. */ private CharSequence mTitle; private String courtShort; private String dateString; private com.spacejake.jake.ultimatepurduediner.Menu foodMenu = new com.spacejake.jake.ultimatepurduediner.Menu(); private Spinner spinner; private ListView listView; private SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd"); private Calendar cal; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTitle = getTitle(); mNavigationDrawerFragment = (NavigationDrawerFragment) getFragmentManager() .findFragmentById(R.id.navigation_drawer); // Set up the drawer. mNavigationDrawerFragment.setUp(R.id.navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout)); cal = Calendar.getInstance(); dateString = format.format(cal.getTime()); spinner = (Spinner) findViewById(R.id.spinner); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { updateMeal(); } @Override public void onNothingSelected(AdapterView<?> adapterView) { } }); listView = (ListView) findViewById(R.id.listview); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { String foodName = adapterView.getItemAtPosition(i).toString(); String meal = spinner.getSelectedItem().toString(); FragmentTransaction ft = getFragmentManager().beginTransaction(); Fragment previous = getFragmentManager().findFragmentByTag("floatingFood"); if (previous != null) { ft.remove(previous); } ft.addToBackStack(null); DialogFragment frag = FloatingFood.newInstance(foodName, mTitle.toString(), meal, cal); frag.show(ft, "floatingFood"); } }); } @Override public void onNavigationDrawerItemSelected(int position) { // update the main content by replacing fragments FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction().replace(R.id.container, PlaceholderFragment.newInstance(position + 1)) .commit(); } public void onSectionAttached(int number) { switch (number) { case 1: mTitle = getString(R.string.Earhart); courtShort = "ERHT"; break; case 2: mTitle = getString(R.string.Ford); courtShort = "FORD"; break; case 3: mTitle = getString(R.string.Hillenbrand); courtShort = "HILL"; break; case 4: mTitle = getString(R.string.Wiley); courtShort = "WILY"; break; case 5: mTitle = getString(R.string.Windsor); courtShort = "WIND"; break; } populateMenu(); } public void restoreActionBar() { ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setDisplayShowTitleEnabled(true); actionBar.setTitle(mTitle); } @Override public boolean onCreateOptionsMenu(Menu menu) { if (!mNavigationDrawerFragment.isDrawerOpen()) { // Only show items in the action bar relevant to this screen // if the drawer is not showing. Otherwise, let the drawer // decide what to show in the action bar. getMenuInflater().inflate(R.menu.main, menu); restoreActionBar(); return true; } return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { /** * The fragment argument representing the section number for this * fragment. */ private static final String ARG_SECTION_NUMBER = "section_number"; /** * Returns a new instance of this fragment for the given section * number. */ public static PlaceholderFragment newInstance(int sectionNumber) { PlaceholderFragment fragment = new PlaceholderFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); return fragment; } public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } @Override public void onAttach(Activity activity) { super.onAttach(activity); ((MainActivity) activity).onSectionAttached(getArguments().getInt(ARG_SECTION_NUMBER)); } } public void dateChange(int year, int month, int day) { cal.set(year, month, day); dateString = format.format(cal.getTime()); populateMenu(); } public void populateMenu() { try { URL hfs = null; if (courtShort != null) { hfs = new URL(String.format("http://www.housing.purdue.edu/Menus/%s/%s", courtShort, dateString)); } else { hfs = new URL("http://www.housing.purdue.edu/Menus/ERHT"); } MealGetter t = new MealGetter(this); t.execute(hfs); } catch (MalformedURLException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } public void updateMenu(com.spacejake.jake.ultimatepurduediner.Menu foodMenu, int selection) { this.foodMenu = foodMenu; SpinnerAdapter spinnerAdapter = new SpinnerAdapter(MainActivity.this, foodMenu.getMeals()); spinner.setAdapter(spinnerAdapter); spinnerAdapter.notifyDataSetChanged(); spinner.setSelection(selection); if (foodMenu.getMenuNote() != null) { new AlertDialog.Builder(this).setTitle("A Special Note Was Found!").setMessage(foodMenu.getMenuNote()) .show(); } } public void updateMeal() { ListAdapter listAdapter = new ListAdapter(MainActivity.this, foodMenu.getMeals()[spinner.getSelectedItemPosition()].getMenuItems()); listView.setAdapter(listAdapter); listAdapter.notifyDataSetChanged(); } }