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.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.res.Resources; import android.os.Bundle; import android.app.Fragment; import android.os.Handler; import android.support.v4.content.LocalBroadcastManager; import android.support.v4.widget.SwipeRefreshLayout; 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 android.widget.AbsListView; import android.widget.ListView; import android.widget.Toast; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import com.sbhstimetable.sbhs_timetable_android.backend.ApiAccessor; import com.sbhstimetable.sbhs_timetable_android.backend.internal.CommonFragmentInterface; import com.sbhstimetable.sbhs_timetable_android.backend.internal.ThemeHelper; import com.sbhstimetable.sbhs_timetable_android.backend.json.BelltimesAdapter; import com.sbhstimetable.sbhs_timetable_android.backend.json.BelltimesJson; /** * A simple {@link Fragment} subclass. * Activities that contain this fragment must implement the * {@link com.sbhstimetable.sbhs_timetable_android.backend.internal.CommonFragmentInterface} interface * to handle interaction events. * Use the {@link BelltimesFragment#newInstance} factory method to * create an instance of this fragment. * */ public class BelltimesFragment extends Fragment { private CommonFragmentInterface mListener; private SwipeRefreshLayout layout; private BelltimesAdapter adapter; private BroadcastListener listener; /** are we refreshing * in the UI? */ public boolean refreshing = false; //private Menu menu; public static BelltimesFragment newInstance() { return new BelltimesFragment(); } public BelltimesFragment() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { //this.menu = menu; super.onCreateOptionsMenu(menu, inflater); this.mListener.updateCachedStatus(menu); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment final SwipeRefreshLayout v = (SwipeRefreshLayout) inflater.inflate(R.layout.fragment_belltimes, container, false); this.layout = v; final Context c = this.getActivity(); v.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { refreshing = true; ApiAccessor.getBelltimes(c, false); ApiAccessor.getNotices(c, false); ApiAccessor.getToday(c, false); } }); if (ThemeHelper.isBackgroundDark()) { v.setProgressBackgroundColor(R.color.background_floating_material_dark); } else { v.setProgressBackgroundColor(R.color.background_floating_material_light); } v.setColorSchemeColors(getResources().getColor(R.color.blue), getResources().getColor(R.color.green), getResources().getColor(R.color.yellow), getResources().getColor(R.color.red)); final ListView lv = (ListView) v.findViewById(R.id.belltimes_listview); /*lv.setOnScrollListener(new AbsListView.OnScrollListener() { @Override public void onScrollStateChanged(AbsListView absListView, int i) { } @Override public void onScroll(AbsListView absListView, int i, int i2, int i3) { int topRowVerticalPosition = (lv == null || v.getChildCount() == 0) ? 0 : v.getChildAt(0).getTop(); Log.i("belltimesFragment", "scroll? COMPUTER SAYS " + topRowVerticalPosition); v.setEnabled(topRowVerticalPosition >= -100); } });*/ this.adapter = new BelltimesAdapter(BelltimesJson.getInstance()); lv.setAdapter(this.adapter); return v; } @Override public void onAttach(Activity activity) { super.onAttach(activity); IntentFilter i = new IntentFilter(); i.addAction(ApiAccessor.ACTION_NOTICES_JSON); i.addAction(ApiAccessor.ACTION_BELLTIMES_JSON); i.addAction(ApiAccessor.ACTION_TODAY_JSON); i.addAction(ApiAccessor.ACTION_BELLTIMES_FAILED); Log.i("belltimesFragment", "I want " + i.getAction(3)); if (this.listener == null) { this.listener = new BroadcastListener(this); } LocalBroadcastManager.getInstance(this.getActivity()).registerReceiver(this.listener, i); try { mListener = (CommonFragmentInterface) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement CommonFragmentInterface"); } } @Override public void onDetach() { super.onDetach(); LocalBroadcastManager.getInstance(this.getActivity()).unregisterReceiver(this.listener); mListener = null; } private class BroadcastListener extends BroadcastReceiver { private BelltimesFragment frag; BroadcastListener(BelltimesFragment f) { this.frag = f; } @Override public void onReceive(Context context, Intent intent) { String act = intent.getAction(); if (act.equals(ApiAccessor.ACTION_BELLTIMES_JSON) || act.equals(ApiAccessor.ACTION_TODAY_JSON) || act.equals(ApiAccessor.ACTION_NOTICES_JSON)) { if (this.frag == null) return; this.frag.layout.setRefreshing(false); if (act.equals(ApiAccessor.ACTION_BELLTIMES_JSON)) { Toast.makeText(context, R.string.refresh_success, Toast.LENGTH_SHORT).show(); JsonObject o = new JsonParser().parse(intent.getStringExtra(ApiAccessor.EXTRA_JSON_DATA)) .getAsJsonObject(); if (o.has("bells")) { BelltimesJson b = new BelltimesJson(o); this.frag.adapter.updateBelltimes(b); } } } else if (act.equals(ApiAccessor.ACTION_BELLTIMES_FAILED)) { Toast.makeText(context, intent.getIntExtra(ApiAccessor.EXTRA_ERROR_MESSAGE, R.string.err_noerr), Toast.LENGTH_SHORT).show(); if (this.frag == null) return; this.frag.layout.setRefreshing(false); } } } }