Java tutorial
/* * The CroudTrip! application aims at revolutionizing the car-ride-sharing market with its easy, * user-friendly and highly automated way of organizing shared Trips. Copyright (C) 2015 Nazeeh Ammari, * Philipp Eichhorn, Ricarda Hohn, Vanessa Lange, Alexander Popp, Frederik Simon, Michael Weber * This program is free software: you can redistribute it and/or modify it under the terms of the GNU * Affero 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 Affero General Public License for more details. * You should have received a copy of the GNU Affero General Public License along with this program. * If not, see http://www.gnu.org/licenses/. */ package org.croudtrip.fragments.join; import android.annotation.TargetApi; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTransaction; import android.os.Build; import android.content.BroadcastReceiver; import android.support.v4.app.FragmentManager; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.os.Bundle; import android.support.v4.content.LocalBroadcastManager; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.View; import android.view.ViewGroup; import org.croudtrip.Constants; import org.croudtrip.R; import org.croudtrip.fragments.SubscriptionFragment; import java.lang.reflect.Field; import it.neokree.materialnavigationdrawer.MaterialNavigationDrawer; /** * Created by alex on 22.04.15. * The Dispatch Fragment has no "own view", it should only redirect/show the correct fragments. The main reason for this is that we have only one fragment in the menu/navigationDrawer and do not have to switch it out dynamically everytime something on the UI changes. */ public class JoinDispatchFragment extends SubscriptionFragment { public final static String KEY_CURRENT_LOCATION_LATITUDE = "current_location_latitude"; public final static String KEY_CURRENT_LOCATION_LONGITUDE = "current_location_longitude"; public final static String KEY_DESTINATION_LATITUDE = "destination_latitude"; public final static String KEY_DESTINATION_LONGITUDE = "destination_longitude"; public final static String KEY_MAX_WAITING_TIME = "max_waiting_time"; public final static String KEY_JOIN_TRIP_REQUEST_RESULT = "join_trip_request_result"; private Fragment searchFragment, resultsFragment, drivingFragment; private boolean allowBackPressed = true; private BroadcastReceiver changeUiReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Bundle args = intent.getExtras(); replaceChildFragment(args); } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); searchFragment = new JoinSearchFragment(); drivingFragment = new JoinDrivingFragment(); resultsFragment = new JoinResultsFragment(); LocalBroadcastManager.getInstance(getActivity()).registerReceiver(changeUiReceiver, new IntentFilter(Constants.EVENT_CHANGE_JOIN_UI)); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { super.onCreateView(inflater, container, savedInstanceState); setHasOptionsMenu(true); View view = inflater.inflate(R.layout.fragment_join_dispatch, container, false); replaceChildFragment(getArguments()); return view; } /* Set default title and clear notification text. Show the correct fragment based on the status saved in the shared preferences */ private void replaceChildFragment(Bundle args) { ((MaterialNavigationDrawer) getActivity()).getCurrentSection().setNotificationsText(""); ((MaterialNavigationDrawer) getActivity()).getCurrentSection().setTitle(getString(R.string.menu_join_trip)); ((MaterialNavigationDrawer) getActivity()).setTitle(R.string.menu_join_trip); FragmentTransaction transaction = getChildFragmentManager().beginTransaction(); SharedPreferences prefs = getActivity().getSharedPreferences(Constants.SHARED_PREF_FILE_PREFERENCES, Context.MODE_PRIVATE); //SEARCHING -> Show the results fragment (waiting screen + results) if (prefs.getBoolean(Constants.SHARED_PREF_KEY_SEARCHING, false)) { if (args != null) { resultsFragment = new JoinResultsFragment(); resultsFragment.setArguments(args); } allowBackPressed = false; transaction.replace(R.id.child_fragment, resultsFragment).commitAllowingStateLoss(); //ACCEPTED -> Show the driving fragment } else if (prefs.getBoolean(Constants.SHARED_PREF_KEY_ACCEPTED, false) || prefs.getBoolean(Constants.SHARED_PREF_KEY_WAITING, false)) { if (args != null) { drivingFragment = new JoinDrivingFragment(); drivingFragment.setArguments(args); } allowBackPressed = false; transaction.replace(R.id.child_fragment, drivingFragment).commitAllowingStateLoss(); //OTHERWISE -> Show the default search fragment } else { if (args != null) { searchFragment = new JoinSearchFragment(); searchFragment.setArguments(args); } allowBackPressed = true; transaction.replace(R.id.child_fragment, searchFragment).commitAllowingStateLoss(); } } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); //Propagate event to child fragment if (searchFragment != null) { searchFragment.onActivityResult(requestCode, resultCode, data); } } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); menu.clear(); //inflater.inflate(R.menu.menu_main, menu); } @Override public void onDetach() { super.onDetach(); ((MaterialNavigationDrawer) getActivity()).getCurrentSection().setNotificationsText(""); LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(changeUiReceiver); try { Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager"); childFragmentManager.setAccessible(true); childFragmentManager.set(this, null); } catch (NoSuchFieldException e) { throw new RuntimeException(e); } catch (IllegalAccessException e) { throw new RuntimeException(e); } } /* Handle the onBackPressed. Close the app if the user is at the searchFragment, otherwise navigate back to the searchFragment */ public boolean allowBackPressed() { /* This doesnt make any sense any more if (!allowBackPressed) { SharedPreferences prefs = getActivity().getSharedPreferences(Constants.SHARED_PREF_FILE_PREFERENCES, Context.MODE_PRIVATE); SharedPreferences.Editor editor = prefs.edit(); editor.putBoolean(Constants.SHARED_PREF_KEY_SEARCHING, false); editor.putBoolean(Constants.SHARED_PREF_KEY_ACCEPTED, false); editor.putBoolean(Constants.SHARED_PREF_KEY_WAITING, false); editor.putLong(Constants.SHARED_PREF_KEY_QUERY_ID, -1); editor.apply(); replaceChildFragment(null); return false; }*/ return true; } }