Java tutorial
/* * SettingsActivity.java * * Original work Copyright (C) 2014 Philipp Dreimann * Modified work Copyright (C) 2015 Bjoern Petri * * 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 2 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, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ package net.freifunk.android.discover; import android.annotation.TargetApi; import android.content.Context; import android.content.res.Configuration; import android.os.Build; import android.os.Bundle; import android.preference.CheckBoxPreference; import android.preference.EditTextPreference; import android.preference.ListPreference; import android.preference.Preference; import android.preference.PreferenceActivity; import android.preference.PreferenceCategory; import android.preference.PreferenceFragment; import android.preference.PreferenceManager; import android.preference.PreferenceScreen; import android.view.MenuItem; import android.support.v4.app.NavUtils; import net.freifunk.android.discover.helper.Database; import net.freifunk.android.discover.helper.EventBus; import net.freifunk.android.discover.model.MapMaster; import net.freifunk.android.discover.model.NodeMap; import net.freifunk.android.discover.model.NodeMapComparator; import net.freifunk.android.discover.model.NodeResult; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * A {@link PreferenceActivity} that presents a set of application settings. On * handset devices, settings are presented as a single list. On tablets, * settings are split by category, with category headers shown to the left of * the list of settings. * <p> * See <a href="http://developer.android.com/design/patterns/settings.html"> * Android Design: Settings</a> for design guidelines and the <a * href="http://developer.android.com/guide/topics/ui/settings.html">Settings * API Guide</a> for more information on developing a Settings UI. */ public class SettingsActivity extends PreferenceActivity { /** * Determines whether to always show the simplified settings UI, where * settings are presented in a single list. When false, settings are shown * as a master/detail two-pane view on tablets. When true, a single pane is * shown on tablets. */ private static final boolean ALWAYS_SIMPLE_PREFS = false; private static final String TAG = SettingsActivity.class.getName(); @Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.pref_data_sync); // get data via the key ArrayList<NodeMap> nodeMapArrayList = new ArrayList<NodeMap>(MapMaster.getInstance().getMaps().values()); PreferenceCategory communities = (PreferenceCategory) findPreference("communities"); // sort by Name Collections.sort(nodeMapArrayList, new NodeMapComparator()); if (nodeMapArrayList != null && communities != null) { for (final NodeMap nm : nodeMapArrayList) { PreferenceScreen communityPreferenceScreen = getPreferenceManager() .createPreferenceScreen(SettingsActivity.this); communityPreferenceScreen.setTitle(nm.getMapName()); communityPreferenceScreen.setKey(nm.getMapName()); final CheckBoxPreference deactivateCommunityPreference = new CheckBoxPreference( SettingsActivity.this); // TODO: move Strings to resources deactivateCommunityPreference.setTitle("Community aktiv"); deactivateCommunityPreference .setSummary("deaktivieren, falls Community nicht auf der Karte angezeigt werden soll"); deactivateCommunityPreference.setKey("community_deactivate_" + nm.getMapName()); deactivateCommunityPreference.setChecked(nm.isActive()); deactivateCommunityPreference .setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object newValue) { Database db = Database.getInstance(null); boolean newActive = newValue.toString().equals("true") ? true : false; nm.setActive(newActive); db.addNodeMap(nm); // reload if set to active if (newActive) { nm.loadNodes(); } else { nm.updateNodes(); } return true; } }); EditTextPreference editCommunityPreference = new EditTextPreference(SettingsActivity.this); // TODO: move Strings to resources editCommunityPreference.setTitle("URL bearbeiten"); editCommunityPreference.setSummary("aendern, falls eine andere Quelle genutzt werden soll."); editCommunityPreference.setKey("community_edit_" + nm.getMapName()); editCommunityPreference.setText(nm.getMapUrl()); editCommunityPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object newValue) { Database db = Database.getInstance(null); // remove old nodes from map nm.setActive(false); EventBus.getInstance().post(new NodeResult(NodeResult.NodeResultType.UPDATE_NODES, nm)); // we should probably do this async as well db.deleteAllNodesForMap(nm); // load new nodes NodeMap newMap = new NodeMap(nm.getMapName(), (String) newValue, true); db.addNodeMap(newMap); //HashMap<String, NodeMap> nodeResult = new HashMap<String, NodeMap>(1); //nodeResult.put(nm.getMapName(), nm); newMap.updateNodes(); //EventBus.getInstance().post(new NodeResult(NodeResult.NodeResultType.LOAD_NODES, nm)); //EventBus.getInstance().post(new NodeResult(NodeResult.NodeResultType.UPDATE_MAP, nodeResult)); return true; } }); communityPreferenceScreen.addPreference(deactivateCommunityPreference); communityPreferenceScreen.addPreference(editCommunityPreference); communities.addPreference(communityPreferenceScreen); } } setupActionBar(); } /** * Set up the {@link android.app.ActionBar}, if the API is available. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB) private void setupActionBar() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { // Show the Up button in the action bar. getActionBar().setDisplayHomeAsUpEnabled(true); } } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == android.R.id.home) { // This ID represents the Home or Up button. In the case of this // activity, the Up button is shown. Use NavUtils to allow users // to navigate up one level in the application structure. For // more details, see the Navigation pattern on Android Design: // // http://developer.android.com/design/patterns/navigation.html#up-vs-back // // TODO: If Settings has multiple levels, Up should navigate up // that hierarchy. NavUtils.navigateUpFromSameTask(this); return true; } return super.onOptionsItemSelected(item); } /** {@inheritDoc} */ @Override public boolean onIsMultiPane() { return isXLargeTablet(this) && !isSimplePreferences(this); } /** * Helper method to determine if the device has an extra-large screen. For * example, 10" tablets are extra-large. */ private static boolean isXLargeTablet(Context context) { return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE; } /** * Determines whether the simplified settings UI should be shown. This is * true if this is forced via {@link #ALWAYS_SIMPLE_PREFS}, or the device * doesn't have newer APIs like {@link PreferenceFragment}, or the device * doesn't have an extra-large screen. In these cases, a single-pane * "simplified" settings UI should be shown. */ private static boolean isSimplePreferences(Context context) { return ALWAYS_SIMPLE_PREFS || Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB || !isXLargeTablet(context); } /** {@inheritDoc} */ @Override @TargetApi(Build.VERSION_CODES.HONEYCOMB) public void onBuildHeaders(List<Header> target) { if (!isSimplePreferences(this)) { loadHeadersFromResource(R.xml.pref_headers, target); } } /** * A preference value change listener that updates the preference's summary * to reflect its new value. */ private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object value) { String stringValue = value.toString(); if (preference instanceof ListPreference) { // For list preferences, look up the correct display value in // the preference's 'entries' list. ListPreference listPreference = (ListPreference) preference; int index = listPreference.findIndexOfValue(stringValue); // Set the summary to reflect the new value. preference.setSummary(index >= 0 ? listPreference.getEntries()[index] : null); } else { // For all other preferences, set the summary to the value's // simple string representation. preference.setSummary(stringValue); } return true; } }; /** * Binds a preference's summary to its value. More specifically, when the * preference's value is changed, its summary (line of text below the * preference title) is updated to reflect the value. The summary is also * immediately updated upon calling this method. The exact display format is * dependent on the type of preference. * * @see #sBindPreferenceSummaryToValueListener */ private static void bindPreferenceSummaryToValue(Preference preference) { // Set the listener to watch for value changes. preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener); // Trigger the listener immediately with the preference's // current value. sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, PreferenceManager .getDefaultSharedPreferences(preference.getContext()).getString(preference.getKey(), "")); } /** * This fragment shows data and sync preferences only. It is used when the * activity is showing a two-pane settings UI. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB) public static class DataSyncPreferenceFragment extends PreferenceFragment { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.pref_data_sync); // Bind the summaries of EditText/List/Dialog/Ringtone preferences // to their values. When their values change, their summaries are // updated to reflect the new value, per the Android Design // guidelines. bindPreferenceSummaryToValue(findPreference("sync_wifi")); bindPreferenceSummaryToValue(findPreference("sync_frequency")); } } }