Java tutorial
/* * Written 2013 Wilson Brenna. * * This file is part of GTFSOffline. * * GTFSOffline 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. * * GTFSOffline 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 GTFSOffline. If not, see <http://www.gnu.org/licenses/>. */ package com.wbrenna.gtfsoffline; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set; import android.app.ActionBar; import android.app.FragmentTransaction; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.location.Location; import android.location.LocationListener; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; //import android.support.v4.app.FragmentTransaction; import android.support.v4.app.ListFragment; import android.support.v4.view.ViewPager; import android.util.Log; 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.ProgressBar; import android.widget.Toast; public class MainActivity extends FragmentActivity implements ActionBar.TabListener { private static final String TAG = "MainActivity"; /** * The {@link android.support.v4.view.PagerAdapter} that will provide * fragments for each of the sections. We use a * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which * will keep every loaded fragment in memory. If this becomes too memory * intensive, it may be best to switch to a * {@link android.support.v4.app.FragmentStatePagerAdapter}. */ SectionsPagerAdapter mSectionsPagerAdapter; /** * The {@link ViewPager} that will host the section contents. */ ViewPager mViewPager; SharedPreferences mPrefs; //public final String[] mDBPreferences = {"Grand River Transit", "Saskatoon Transit"}; //LocationManager mLocationManager; LocationHelper mLocationHelper; //We store the active (checked) preferences in mDBActive public static String[] mDBActive = null; public static DatabaseHelper dbHelper = null; public static Set<String> mDBList; public static Set<String> mDBListPrefsOld; public static Location mLocation = null; public static LocationListener locationListener = null; public static ProgressBar mProgress = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Set up the action bar. final ActionBar actionBar = getActionBar(); if (actionBar != null) { actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); } mProgress = (ProgressBar) findViewById(R.id.progress); //read in the preferences mPrefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); Set<String> emptyString = new HashSet<String>(); emptyString.clear(); Set<String> initial_preferences = mPrefs.getStringSet(getString(R.string.pref_dbs), emptyString); mDBListPrefsOld = initial_preferences; //this is the list of currently checked databases String[] tmpDBActive = initial_preferences.toArray(new String[initial_preferences.size()]); //we have to be careful to exclude databases that aren't in our directory dbHelper = new DatabaseHelper(this); dbHelper.gatherFiles(); mDBList = dbHelper.GetListofDB(); List<String> workingDBList = new ArrayList<String>(); for (int i = 0; i < tmpDBActive.length; i++) { if (mDBList.contains(tmpDBActive[i])) { workingDBList.add(tmpDBActive[i]); } else { initial_preferences.remove(tmpDBActive[i]); } } if (workingDBList.size() == 0) { mDBActive = null; } else { mDBActive = workingDBList.toArray(new String[workingDBList.size()]); } Editor prefsDBEditor = mPrefs.edit(); prefsDBEditor.putStringSet(getString(R.string.pref_dbs), initial_preferences); prefsDBEditor.commit(); //Set up the location management mLocationHelper = new LocationHelper(this); mLocation = mLocationHelper.startLocationManager(); // Define a listener that responds to location updates locationListener = new LocationListener() { @Override public void onLocationChanged(Location location) { if (mLocationHelper.isBetterLocation(location, mLocation)) { mLocation = location; if (mLocation != null) { //new ProcessBusStops().execute(); mSectionsPagerAdapter.notifyDataSetChanged(); } else { Toast.makeText(getBaseContext(), R.string.last_location_fix, Toast.LENGTH_LONG).show(); //Log.e(TAG, "No more location fixes "); } } } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } @Override public void onProviderEnabled(String provider) { } @Override public void onProviderDisabled(String provider) { } }; //TODO: eventually add automated downloading of databases... // Create the adapter that will return a fragment for each of the // primary sections of the app. mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.pager); mViewPager.setAdapter(mSectionsPagerAdapter); mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { actionBar.setSelectedNavigationItem(position); } }); // For each of the sections in the app, add a tab to the action bar. for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { actionBar .addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this)); } } @Override protected void onResume() { super.onResume(); //we want to refresh the databases list Set<String> emptyString = new HashSet<String>(); emptyString.clear(); Set<String> initial_preferences = mPrefs.getStringSet(getString(R.string.pref_dbs), emptyString); //in case we're on a low-ram system and things aren't cached try { if (!initial_preferences.equals(mDBListPrefsOld)) { mDBListPrefsOld = initial_preferences; //this is the list of currently checked databases mDBActive = null; //just to nullify the previous one. if (initial_preferences.size() != 0) { String[] tmpDBActive = initial_preferences.toArray(new String[initial_preferences.size()]); dbHelper.gatherFiles(); mDBList = dbHelper.GetListofDB(); List<String> workingDBList = new ArrayList<String>(); for (int i = 0; i < tmpDBActive.length; i++) { if (mDBList.contains(tmpDBActive[i])) { workingDBList.add(tmpDBActive[i]); } } if (workingDBList.size() == 0) { mDBActive = null; } else { mDBActive = workingDBList.toArray(new String[workingDBList.size()]); } } mSectionsPagerAdapter.notifyDataSetChanged(); //totally kill the viewPager and all, and recreate! //mSectionsPagerAdapter = null; //getFragmentManager().beginTransaction().replace(containerViewId, fragment); //and create the appropriate tabs final ActionBar actionBar = getActionBar(); /**mSectionsPagerAdapter = new SectionsPagerAdapter( getSupportFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.pager); mViewPager.setAdapter(mSectionsPagerAdapter); mViewPager .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { actionBar.setSelectedNavigationItem(position); } });**/ if (actionBar != null) { actionBar.removeAllTabs(); } for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { actionBar.addTab( actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this)); //update the fragment contents /**if (i > 0 ) { Fragment newFragment = new DBListFragment(); Bundle args = new Bundle(); args.putString(DBListFragment.DATABASE, mDBActive[i-1]); newFragment.setArguments(args); getFragmentManager().beginTransaction().replace(i, newFragment); }**/ if (i > 0) { DBListFragment aFragment = (DBListFragment) getSupportFragmentManager() .findFragmentByTag("android:switcher:" + R.id.pager + ":" + Integer.toString(i)); if (aFragment != null) { getSupportFragmentManager().beginTransaction().remove(aFragment).commit(); mSectionsPagerAdapter.notifyDataSetChanged(); //if (aFragment.getView() != null) { //aFragment.updateDisplay(); //} } } else if (i == 0) { FavSectionFragment aFavFragment = (FavSectionFragment) getSupportFragmentManager() .findFragmentByTag("android:switcher:" + R.id.pager + ":" + Integer.toString(i)); if (aFavFragment != null) { //getSupportFragmentManager().beginTransaction().remove(aFavFragment).commit(); //mSectionsPagerAdapter.notifyDataSetChanged(); //if (aFavFragment.getView() != null) { //aFavFragment.updateDisplay(); //} aFavFragment.updatePositions(); } } } } } finally { //restart location manager //mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); mLocationHelper.refresh(locationListener); } } @Override protected void onPause() { super.onPause(); //kill the location manager mLocationHelper.unlinkLocation(locationListener); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_settings: //launch prefs Intent i = new Intent(this, PrefsActivity.class); startActivity(i); /** * This code replaces just the active fragment. Not what I want! Useful later... android.app.FragmentManager mFragmentManager = getFragmentManager(); FragmentTransaction mFragmentTransaction = mFragmentManager.beginTransaction(); PrefsFragment mPrefsFragment = new PrefsFragment(); mFragmentTransaction.replace(android.R.id.content, mPrefsFragment); mFragmentTransaction.commit(); **/ break; case R.id.action_movedb: //launch UpdateActivity Intent j = new Intent(this, UpdateActivity.class); startActivity(j); break; } return true; } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // When the given tab is selected, switch to the corresponding page in // the ViewPager. mViewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { //we want to turn off location management? //mSectionsPagerAdapter.notifyDataSetChanged(); } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } /** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentPagerAdapter { //private final FragmentManager mFragmentManager; public SectionsPagerAdapter(FragmentManager fm) { super(fm); //mFragmentManager = fm; } @Override public Fragment getItem(int position) { // getItem is called to instantiate the fragment for the given page. // Return a DummySectionFragment (defined as a static inner class // below) with the page number as its lone argument. if (position == 0) { Fragment fragment = new FavSectionFragment(); Bundle args = new Bundle(); args.putInt(FavSectionFragment.ARG_SECTION_NUMBER, position + 1); fragment.setArguments(args); return fragment; } else { //Fragment fragment = new DBListFragment(mDBActive[position-1]); Fragment fragment = new DBListFragment(); Bundle args = new Bundle(); args.putString(DBListFragment.DATABASE, mDBActive[position - 1]); fragment.setArguments(args); return fragment; } } @Override public int getItemPosition(Object object) { return POSITION_NONE; } @Override public int getCount() { // Sum of all the preference checkboxes = number of pages + 1 if (mDBActive == null) { return 1; } else if (mDBActive[0].equals("")) { //this shouldn't happen mDBActive = null; return 1; } else { return 1 + mDBActive.length; } } @Override public CharSequence getPageTitle(int position) { //Locale l = Locale.getDefault(); //we just use the array of preferences if (position == 0) { return getString(R.string.favs); } else { return mDBActive[position - 1]; } } } /** * A dummy fragment representing a section of the app, but that simply * displays dummy text. */ public static class FavSectionFragment extends ListFragment { /** * The fragment argument representing the section number for this * fragment. */ public static final String ARG_SECTION_NUMBER = "section_number"; private FavFragmentHelper mFavFragHelper; //private String myDatabaseName; private timestopdescArrayAdapter mListAdapter; // public FavSectionFragment() { // } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main_db, container, false); return rootView; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mFavFragHelper = new FavFragmentHelper(this.getActivity(), mDBActive, mProgress); //setup the list adapter mFavFragHelper.runProcess(); mListAdapter = new timestopdescArrayAdapter(this.getActivity(), R.layout.favstopdesc, mFavFragHelper.retrieveNextBusList()); setListAdapter(mListAdapter); mFavFragHelper.addTimeAdapter(mListAdapter); //set up the long click favourites getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { mFavFragHelper.onListItemLongClick(parent, view, position, id); return true; // we consumed the click } }); } public void onListItemClick(ListView lv, View v, int position, long id) { Log.v(TAG, "clicked position " + position); final String[] strs = (String[]) lv.getItemAtPosition(position); if (strs == null) { return; } final String stop_id = strs[1]; final String stop_name = strs[2]; final String headsign = strs[3]; final String trip_id = strs[5]; final String myDatabaseName = strs[6]; Log.v(TAG, "Found stop with ID,name,etc:" + stop_id + stop_name + trip_id); final Intent routes = new Intent(this.getActivity(), TimesActivity.class); final String pkgstr = this.getActivity().getApplicationContext().getPackageName(); routes.putExtra(pkgstr + ".stop_id", stop_id); routes.putExtra(pkgstr + ".stop_name", stop_name); routes.putExtra(pkgstr + ".trip_id", trip_id); routes.putExtra(pkgstr + ".headsign", headsign); routes.putExtra(pkgstr + ".db_name", myDatabaseName); this.getActivity().startActivity(routes); } public void updatePositions() { mFavFragHelper.reloadPreferences(); mFavFragHelper.runProcess(); } } public static class DBListFragment extends ListFragment { /** * The fragment argument representing the section number for this * fragment. */ private static final String DATABASE = "DBPlaceholder"; public String myDatabase; private LocationFragmentHelper mLocationFragHelper; private timestopdescArrayAdapter mListAdapter; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_main_db, container, false); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); //set our database myDatabase = getArguments().getString(DATABASE); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mLocationFragHelper = new LocationFragmentHelper(this.getActivity(), myDatabase, null, mProgress); //setup the list adapter mLocationFragHelper.runProcessOnLocation(mLocation); mListAdapter = new timestopdescArrayAdapter(this.getActivity(), R.layout.timestopdesc, mLocationFragHelper.retrieveNextBusList()); setListAdapter(mListAdapter); mLocationFragHelper.addTimeAdapter(mListAdapter); //set up the long click favourites getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { mLocationFragHelper.onListItemLongClick(parent, view, position, id); return true; // we consumed the click } }); } public void onListItemClick(ListView lv, View v, int position, long id) { Log.v(TAG, "clicked position " + position); final String[] strs = (String[]) lv.getItemAtPosition(position); if (strs == null) { return; } final String stop_id = strs[1]; final String stop_name = strs[2]; final String headsign = strs[3]; final String trip_id = strs[5]; Log.v(TAG, "Found stop with ID,name,etc:" + stop_id + stop_name + trip_id); final Intent routes = new Intent(this.getActivity(), TimesActivity.class); final String pkgstr = this.getActivity().getApplicationContext().getPackageName(); routes.putExtra(pkgstr + ".stop_id", stop_id); routes.putExtra(pkgstr + ".stop_name", stop_name); routes.putExtra(pkgstr + ".trip_id", trip_id); routes.putExtra(pkgstr + ".headsign", headsign); routes.putExtra(pkgstr + ".db_name", myDatabase); this.getActivity().startActivity(routes); } public void updatePositions() { mLocationFragHelper.runProcessOnLocation(mLocation); } } }