Java tutorial
/* * SBHS-Timetable-Android: Countdown and timetable all at once (Android app). * Copyright (C) 2014 Simon Shields, James Ye * * This file is part of SBHS-Timetable-Android. * * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ package com.sbhstimetable.sbhs_timetable_android; import android.app.Activity; import android.app.Fragment; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.content.res.Configuration; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.content.LocalBroadcastManager; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBarDrawerToggle; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.TextView; import com.sbhstimetable.sbhs_timetable_android.backend.ApiAccessor; import com.sbhstimetable.sbhs_timetable_android.backend.internal.NavBarFancyAdapter; import com.sbhstimetable.sbhs_timetable_android.backend.internal.ScrimInsetsFrameLayout; import com.sbhstimetable.sbhs_timetable_android.backend.internal.ThemeHelper; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Date; /** * Fragment used for managing interactions for and presentation of a navigation drawer. * See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction"> * design guidelines</a> for a complete explanation of the behaviors implemented here. */ public class NavigationDrawerFragment extends Fragment { /** * Remember the position of the selected item. */ private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position"; /** * Per the design guidelines, you should show the drawer on launch until the user manually * expands it. This shared preference tracks this. */ private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned"; /** * A pointer to the current callbacks instance (the Activity). */ private NavigationDrawerCallbacks mCallbacks; private static final String FMT = "dd/MM hh:mm a"; /** * Helper component that ties the action bar to the navigation drawer. */ private ActionBarDrawerToggle mDrawerToggle; private DrawerLayout mDrawerLayout; private ListView mDrawerListView; private View mFragmentContainerView; private int mCurrentSelectedPosition = 0; private boolean mFromSavedInstanceState; private boolean mUserLearnedDrawer; private TextView todayStatus; private TextView noticesStatus; private TextView bellsStatus; private CacheStatusUpdater csu; private final ArrayList<String> elements = new ArrayList<String>(); private final ArrayList<NavBarFancyAdapter.DrawerEntry> botElements = new ArrayList<NavBarFancyAdapter.DrawerEntry>(); public NavigationDrawerFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Read in the flag indicating whether or not the user has demonstrated awareness of the // drawer. See PREF_USER_LEARNED_DRAWER for details. SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false); if (savedInstanceState != null) { mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION); mFromSavedInstanceState = true; } // Select either the default item (0) or the last selected item. selectItem(mCurrentSelectedPosition); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Indicate that this fragment would like to influence the set of actions in the action bar. setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { ScrimInsetsFrameLayout l = (ScrimInsetsFrameLayout) inflater.inflate(R.layout.fragment_navigation_drawer, container, false); this.mDrawerListView = (ListView) l.findViewById(R.id.navdraw_listview); mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectItem(position); } }); this.elements.addAll(Arrays.asList(getString(R.string.title_countdown), getString(R.string.title_timetable), getString(R.string.title_notices), getString(R.string.title_belltimes))); mDrawerListView.setAdapter(new ArrayAdapter<>(getActivity().getBaseContext(), android.R.layout.simple_list_item_activated_1, this.elements)); mDrawerListView.setItemChecked(mCurrentSelectedPosition, true); ListView smallView = (ListView) l.findViewById(R.id.navdraw_botlistview); smallView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { selectItem(i + elements.size()); } }); int settings_drawable = (ThemeHelper.isBackgroundDark() ? R.drawable.ic_settings_white_24dp : R.drawable.ic_settings_dark_24dp); int login_drawable = (ThemeHelper.isBackgroundDark() ? R.drawable.ic_edit_white_24dp : R.drawable.ic_edit_dark_24dp); this.botElements.addAll(Arrays.asList( new NavBarFancyAdapter.DrawerEntry(settings_drawable, getString(R.string.action_settings), this.getActivity()), new NavBarFancyAdapter.DrawerEntry(login_drawable, getString(R.string.action_login), this.getActivity()))); smallView.setAdapter(new NavBarFancyAdapter<>(getActivity().getBaseContext(), android.R.layout.simple_list_item_1, this.botElements)); long temp = PreferenceManager.getDefaultSharedPreferences(getActivity()) .getLong(ApiAccessor.PREF_BELLTIMES_LAST_UPDATE, 0); this.bellsStatus = (TextView) l.findViewById(R.id.navdraw_bellscached); this.bellsStatus.setText(temp != 0 ? new SimpleDateFormat(FMT).format(new Date(temp)) : "Never"); this.todayStatus = (TextView) l.findViewById(R.id.navdraw_todaycached); temp = PreferenceManager.getDefaultSharedPreferences(getActivity()) .getLong(ApiAccessor.PREF_TODAY_LAST_UPDATE, 0); this.todayStatus.setText(temp != 0 ? new SimpleDateFormat(FMT).format(new Date(temp)) : "Never"); this.noticesStatus = (TextView) l.findViewById(R.id.navdraw_noticescached); temp = PreferenceManager.getDefaultSharedPreferences(getActivity()) .getLong(ApiAccessor.PREF_NOTICES_LAST_UPDATE, 0); this.noticesStatus.setText(temp != 0 ? new SimpleDateFormat(FMT).format(new Date(temp)) : "Never"); return l; } public void updateList() { ArrayAdapter<NavBarFancyAdapter.DrawerEntry> a = (ArrayAdapter<NavBarFancyAdapter.DrawerEntry>) mDrawerListView .getAdapter(); int drawable = (ThemeHelper.isBackgroundDark() ? R.drawable.ic_edit_white_24dp : R.drawable.ic_edit_dark_24dp); if (ApiAccessor.isLoggedIn()) { this.botElements.remove(1); this.botElements.add(new NavBarFancyAdapter.DrawerEntry(drawable, getString(R.string.action_logout), this.getActivity())); } else { if (a.getCount() < 2) { this.botElements.add(new NavBarFancyAdapter.DrawerEntry(drawable, getString(R.string.action_login), this.getActivity())); } } } public boolean isDrawerOpen() { return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView); } public void closeDrawer() { mDrawerLayout.closeDrawer(mFragmentContainerView); } /** * Users of this fragment must call this method to set up the navigation drawer interactions. * * @param fragmentId The android:id of this fragment in its activity's layout. * @param drawerLayout The DrawerLayout containing this fragment's UI. */ public void setUp(int fragmentId, DrawerLayout drawerLayout) { mFragmentContainerView = getActivity().findViewById(fragmentId); mDrawerLayout = drawerLayout; // set a custom shadow that overlays the main content when the drawer opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener ActionBar actionBar = getActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the navigation drawer and the action bar app icon. mDrawerToggle = new ActionBarDrawerToggle((ActionBarActivity) getActivity(), /* host Activity */ mDrawerLayout, /* DrawerLayout object */ R.string.navigation_drawer_open, /* "open drawer" description for accessibility */ R.string.navigation_drawer_close /* "close drawer" description for accessibility */ ) { @Override public void onDrawerClosed(View drawerView) { super.onDrawerClosed(drawerView); if (!isAdded()) { return; } getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu() } @Override public void onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); if (!isAdded()) { return; } if (!mUserLearnedDrawer) { // The user manually opened the drawer; store this flag to prevent auto-showing // the navigation drawer automatically in the future. mUserLearnedDrawer = true; SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity()); sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply(); } getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu() } }; // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer, // per the navigation drawer design guidelines. if (!mUserLearnedDrawer && !mFromSavedInstanceState) { mDrawerLayout.openDrawer(mFragmentContainerView); } // Defer code dependent on restoration of previous instance state. mDrawerLayout.post(new Runnable() { @Override public void run() { mDrawerToggle.syncState(); } }); mDrawerLayout.setDrawerListener(mDrawerToggle); } public void selectItem(int position) { if (position < elements.size()) { mCurrentSelectedPosition = position; if (mDrawerListView != null) { mDrawerListView.setItemChecked(position, true); } } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } if (mCallbacks != null) { mCallbacks.onNavigationDrawerItemSelected(position); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); this.csu = new CacheStatusUpdater(this); IntentFilter i = new IntentFilter(); i.addAction(ApiAccessor.ACTION_BELLTIMES_JSON); i.addAction(ApiAccessor.ACTION_NOTICES_JSON); i.addAction(ApiAccessor.ACTION_TODAY_JSON); LocalBroadcastManager.getInstance(getActivity()).registerReceiver(csu, i); try { mCallbacks = (NavigationDrawerCallbacks) activity; } catch (ClassCastException e) { throw new ClassCastException("Activity must implement NavigationDrawerCallbacks."); } } @Override public void onDetach() { LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(this.csu); super.onDetach(); mCallbacks = null; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Forward the new configuration the drawer toggle component. mDrawerToggle.onConfigurationChanged(newConfig); } @Override public boolean onOptionsItemSelected(MenuItem item) { return mDrawerToggle.onOptionsItemSelected(item) || super.onOptionsItemSelected(item); } /** * Per the navigation drawer design guidelines, updates the action bar to show the global app * 'context', rather than just what's in the current screen. * private void showGlobalContextActionBar() { ActionBar actionBar = getActionBar(); actionBar.setDisplayShowTitleEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setTitle(R.string.app_name); }*/ private ActionBar getActionBar() { return ((ActionBarActivity) getActivity()).getSupportActionBar(); } /** * Callbacks interface that all activities using this fragment must implement. */ public static interface NavigationDrawerCallbacks { /** * Called when an item in the navigation drawer is selected. */ void onNavigationDrawerItemSelected(int position); } public static class CacheStatusUpdater extends BroadcastReceiver { private NavigationDrawerFragment ndf; public CacheStatusUpdater(NavigationDrawerFragment f) { this.ndf = f; } @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(ApiAccessor.ACTION_BELLTIMES_JSON)) { this.ndf.bellsStatus.setText(new SimpleDateFormat(FMT) .format(new Date(PreferenceManager.getDefaultSharedPreferences(ndf.getActivity()) .getLong(ApiAccessor.PREF_BELLTIMES_LAST_UPDATE, 0)))); } else if (intent.getAction().equals(ApiAccessor.ACTION_NOTICES_JSON)) { this.ndf.noticesStatus.setText(new SimpleDateFormat(FMT) .format(new Date(PreferenceManager.getDefaultSharedPreferences(ndf.getActivity()) .getLong(ApiAccessor.PREF_NOTICES_LAST_UPDATE, 0)))); } else if (intent.getAction().equals(ApiAccessor.ACTION_TODAY_JSON)) { this.ndf.todayStatus.setText(new SimpleDateFormat(FMT) .format(new Date(PreferenceManager.getDefaultSharedPreferences(ndf.getActivity()) .getLong(ApiAccessor.PREF_TODAY_LAST_UPDATE, 0)))); } } } }