96 lines
3.1 KiB
Java
96 lines
3.1 KiB
Java
/*
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* Copyright 2016 devemux86
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*
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* This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
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*
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* This program is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.oscim.android;
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import android.app.Activity;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.content.SharedPreferences.Editor;
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import org.oscim.core.MapPosition;
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import org.oscim.map.Map;
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public class MapPreferences {
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private static final String KEY_LATITUDE = "latitude";
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private static final String KEY_LONGITUDE = "longitude";
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private static final String KEY_SCALE = "scale";
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private final String PREFERENCES_FILE;
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Context ctx;
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public MapPreferences(String name, Context ctx) {
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this.ctx = ctx;
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this.PREFERENCES_FILE = name;
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}
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public void clear() {
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Editor editor = ctx.getSharedPreferences(PREFERENCES_FILE, Activity.MODE_PRIVATE).edit();
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editor.clear();
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editor.apply();
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}
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private void putDouble(Editor editor, String key, double value) {
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editor.putLong(key, Double.doubleToLongBits(value));
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}
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private double getDouble(SharedPreferences prefs, String key) {
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return Double.longBitsToDouble(prefs.getLong(key, 0));
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}
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public void save(Map map) {
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save(map.getMapPosition());
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}
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public void save(MapPosition pos) {
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Editor editor = ctx.getSharedPreferences(PREFERENCES_FILE,
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Activity.MODE_PRIVATE).edit();
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editor.clear();
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putDouble(editor, KEY_LATITUDE, pos.y);
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putDouble(editor, KEY_LONGITUDE, pos.x);
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putDouble(editor, KEY_SCALE, pos.scale);
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editor.apply();
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}
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private static boolean containsViewport(SharedPreferences prefs) {
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return prefs.contains(KEY_LATITUDE)
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&& prefs.contains(KEY_LONGITUDE)
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&& prefs.contains(KEY_SCALE);
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}
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public boolean load(Map map) {
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MapPosition pos = map.getMapPosition();
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if (load(pos)) {
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map.setMapPosition(pos);
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return true;
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}
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return false;
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}
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public boolean load(MapPosition pos) {
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SharedPreferences prefs = ctx.getSharedPreferences(PREFERENCES_FILE,
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Activity.MODE_PRIVATE);
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if (containsViewport(prefs)) {
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pos.x = getDouble(prefs, KEY_LONGITUDE);
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pos.y = getDouble(prefs, KEY_LATITUDE);
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pos.scale = getDouble(prefs, KEY_SCALE);
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return true;
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}
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return false;
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}
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}
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