Preferences.java

/*
    DroidFish - An Android chess program.
    Copyright (C) 2011  Peter Österlund, peterosterlund2@gmail.com

    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 org.petero.droidfish.activities;

import org.petero.droidfish.R;
import org.petero.droidfish.Util;

import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;

public class Preferences extends PreferenceActivity {
    private static int currentItem = -1;
    private static int initialItem = -1;

    public static class Fragment extends PreferenceFragment {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.preferences);
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View v = super.onCreateView(inflater, container, savedInstanceState);
            if (v == null)
                return null;

            final ListView lv = (ListView) v.findViewById(android.R.id.list);
            if (lv != null) {
                lv.setOnScrollListener(new OnScrollListener() {
                    @Override
                    public void onScrollStateChanged(AbsListView view, int scrollState) {
                    }
                    @Override
                    public void onScroll(AbsListView view, int firstVisibleItem,
                                         int visibleItemCount, int totalItemCount) {
                        currentItem = firstVisibleItem;
                    }
                });
                lv.post(new Runnable() {
                    @Override
                    public void run() {
                        if (initialItem >= 0)
                            lv.setSelection(initialItem);
                    }
                });
            }

            return v;
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
        initialItem = settings.getInt("prefsViewInitialItem", -1);
        getFragmentManager().beginTransaction()
                            .replace(android.R.id.content, new Fragment())
                            .commit();
        Util.setFullScreenMode(this, settings);
    }

    @Override
    protected void onPause() {
        super.onPause();
        SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
        Editor editor = settings.edit();
        editor.putInt("prefsViewInitialItem", currentItem);
        editor.commit();
    }
}