Java tutorial
/* * Everychan Android (Meta Imageboard Client) * Copyright (C) 2014-2016 miku-nyan <https://github.com/miku-nyan> * * 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.nttec.everychan.ui; import java.util.Calendar; import java.util.LinkedList; import com.nttec.everychan.R; import com.nttec.everychan.api.ChanModule; import com.nttec.everychan.api.models.UrlPageModel; import com.nttec.everychan.common.MainApplication; import com.nttec.everychan.ui.tabs.TabModel; import com.nttec.everychan.ui.tabs.UrlHandler; import android.content.res.Resources; import android.os.Build; import android.os.Bundle; import android.support.v4.app.Fragment; import android.text.TextUtils; import android.view.ContextMenu; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.ContextMenu.ContextMenuInfo; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; public class HistoryFragment extends Fragment implements AdapterView.OnItemClickListener { private MainActivity activity; private HistoryAdapter adapter; private ListView listView; private static LinkedList<Database.HistoryEntry> lastClosed = new LinkedList<>(); public static void setLastClosed(TabModel tab) { if (tab != null && tab.pageModel != null) { switch (tab.pageModel.type) { case UrlPageModel.TYPE_INDEXPAGE: lastClosed.add(new Database.HistoryEntry(tab.pageModel.chanName, null, null, null, tab.title, tab.webUrl, 0)); break; case UrlPageModel.TYPE_BOARDPAGE: lastClosed.add(new Database.HistoryEntry(tab.pageModel.chanName, tab.pageModel.boardName, Integer.toString(tab.pageModel.boardPage), null, tab.title, tab.webUrl, 0)); break; case UrlPageModel.TYPE_THREADPAGE: lastClosed.add(new Database.HistoryEntry(tab.pageModel.chanName, tab.pageModel.boardName, null, tab.pageModel.threadNumber, tab.title, tab.webUrl, 0)); break; } if (MainApplication.getInstance().tabsSwitcher.currentFragment instanceof HistoryFragment) { ((HistoryFragment) MainApplication.getInstance().tabsSwitcher.currentFragment).init(); } if (lastClosed.size() > 30) lastClosed.removeFirst(); } } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); activity = (MainActivity) getActivity(); setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { activity.setTitle(R.string.tabs_history); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) CompatibilityImpl.setActionBarDefaultIcon(activity); listView = (ListView) inflater.inflate(R.layout.history_fragment, container, false); listView.setOnItemClickListener(this); registerForContextMenu(listView); init(); return listView; } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (adapter == null) return; Object item = adapter.getItem(position); if (item instanceof Database.HistoryEntry) { if (((Database.HistoryEntry) item).date == 0) lastClosed.removeLast(); UrlHandler.open(((Database.HistoryEntry) item).url, activity); } } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); menu.add(Menu.NONE, R.id.menu_clear_history, 101, R.string.menu_clear_history) .setIcon(android.R.drawable.ic_menu_close_clear_cancel); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == R.id.menu_clear_history) { if (adapter != null) { MainApplication.getInstance().database.clearHistory(); lastClosed = new LinkedList<>(); init(); } return true; } return false; } private void init() { adapter = new HistoryAdapter(activity); listView.setAdapter(adapter); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); if (adapter == null) return; AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo; Object item = adapter.getItem(info.position); if (item instanceof Database.HistoryEntry) { Database.HistoryEntry entry = (Database.HistoryEntry) item; if (entry.date != 0) { menu.add(Menu.NONE, R.id.context_menu_remove_history, 1, R.string.context_menu_remove_history); menu.add(Menu.NONE, R.id.context_menu_open_browser, 2, R.string.context_menu_open_browser); menu.add(Menu.NONE, R.id.context_menu_favorites_from_fragment, 3, MainApplication.getInstance().database.isFavorite(entry.chan, entry.board, entry.boardPage, entry.thread) ? R.string.context_menu_remove_favorites : R.string.context_menu_add_favorites); } } } @Override public boolean onContextItemSelected(MenuItem item) { int position = ((AdapterView.AdapterContextMenuInfo) item.getMenuInfo()).position; Object listItem = adapter.getItem(position); if (listItem instanceof Database.HistoryEntry) { Database database = MainApplication.getInstance().database; Database.HistoryEntry entry = (Database.HistoryEntry) listItem; switch (item.getItemId()) { case R.id.context_menu_remove_history: database.removeHistory(entry.chan, entry.board, entry.boardPage, entry.thread); adapter.remove(entry); break; case R.id.context_menu_open_browser: UrlHandler.launchExternalBrowser(activity, entry.url); break; case R.id.context_menu_favorites_from_fragment: if (database.isFavorite(entry.chan, entry.board, entry.boardPage, entry.thread)) { database.removeFavorite(entry.chan, entry.board, entry.boardPage, entry.thread); } else { database.addFavorite(entry.chan, entry.board, entry.boardPage, entry.thread, entry.title, entry.url); } } return true; } return false; } private static class HistoryAdapter extends ArrayAdapter<Object> { private static final int SEPARATOR = 0; private static final int NORMAL_ITEM = 1; private LayoutInflater inflater; private int drawablePadding; public HistoryAdapter(MainActivity activity) { super(activity, 0); Resources resources = activity.getResources(); inflater = LayoutInflater.from(activity); drawablePadding = (int) (resources.getDisplayMetrics().density * 5 + 0.5f); long midnight = getMidnight(); int current = 0; int previous = -1; if (lastClosed.size() > 0) { add(resources.getString(R.string.history_last_closed)); add(lastClosed.getLast()); } for (Database.HistoryEntry entity : MainApplication.getInstance().database.getHistory()) { while (entity.date < midnight) { if (current == 0) { current = 1; midnight -= 86400 * 1000; } else if (current == 1) { current = 2; midnight -= 86400 * 1000 * 6; } else { current = 3; midnight = 0; } } if (previous != current) { switch (current) { case 0: add(resources.getString(R.string.history_today)); break; case 1: add(resources.getString(R.string.history_yesterday)); break; case 2: add(resources.getString(R.string.history_last_week)); break; case 3: add(resources.getString(R.string.history_other)); break; } previous = current; } add(entity); } if (getCount() == 0) add(resources.getString(R.string.history_empty)); } private long getMidnight() { Calendar cal = Calendar.getInstance(); cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); cal.set(Calendar.MILLISECOND, 0); return cal.getTimeInMillis(); } @Override public View getView(int position, View convertView, ViewGroup parent) { Object item = getItem(position); View v; if (item instanceof Database.HistoryEntry) { v = convertView == null ? inflater.inflate(android.R.layout.simple_list_item_2, parent, false) : convertView; TextView tv1 = (TextView) v.findViewById(android.R.id.text1); TextView tv2 = (TextView) v.findViewById(android.R.id.text2); tv1.setSingleLine(); tv2.setSingleLine(); tv1.setEllipsize(TextUtils.TruncateAt.END); tv2.setEllipsize(TextUtils.TruncateAt.START); tv1.setText(((Database.HistoryEntry) item).title); tv2.setText(((Database.HistoryEntry) item).url); ChanModule chan = MainApplication.getInstance().getChanModule(((Database.HistoryEntry) item).chan); if (chan != null) { tv1.setCompoundDrawablesWithIntrinsicBounds(chan.getChanFavicon(), null, null, null); tv1.setCompoundDrawablePadding(drawablePadding); } } else { v = convertView == null ? inflater.inflate(R.layout.list_separator, parent, false) : convertView; TextView tv = (TextView) v; tv.setText((String) item); } return v; } @Override public int getViewTypeCount() { return 2; } @Override public int getItemViewType(int position) { return getItem(position) instanceof Database.HistoryEntry ? NORMAL_ITEM : SEPARATOR; } } }