Android example source code file (Preferences.java)

This example Android source code file (Preferences.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, checkboxpreference, content, default_difficulty, difficulty, easy, hard, key_difficulty, key_vibrate, listpreference, medium, os, override, preference, preferenceactivity, preferences, preferencescreen, sharedpreferences, string

The Preferences.java Android example source code

/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.android.divideandconquer;

import android.os.Bundle;
import android.preference.*;
import android.content.Context;
import android.content.SharedPreferences;

/**
 * Holds preferences for the game
 */
public class Preferences extends PreferenceActivity {

    public static final String KEY_VIBRATE = "key_vibrate";
    public static final String KEY_DIFFICULTY = "key_difficulty";

    public enum Difficulty {
        Easy(5),
        Medium(3),
        Hard(1);

        private final int mLivesToStart;

        Difficulty(int livesToStart) {
            mLivesToStart = livesToStart;
        }

        public int getLivesToStart() {
            return mLivesToStart;
        }
    }

    public static Difficulty getCurrentDifficulty(Context context) {
        final SharedPreferences preferences =
                PreferenceManager.getDefaultSharedPreferences(context);
        final String diffic = preferences
                .getString(KEY_DIFFICULTY, DEFAULT_DIFFICULTY.toString());
        return Difficulty.valueOf(diffic);
    }

    public static final Difficulty DEFAULT_DIFFICULTY = Difficulty.Medium;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setPreferenceScreen(createPreferenceHierarchy());
    }

    private PreferenceScreen createPreferenceHierarchy() {
        // Root
        PreferenceScreen root = getPreferenceManager().createPreferenceScreen(this);

        // vibrate on/off
        CheckBoxPreference vibratePref = new CheckBoxPreference(this);
        vibratePref.setDefaultValue(true);
        vibratePref.setKey(KEY_VIBRATE);
        vibratePref.setTitle(R.string.settings_vibrate);
        vibratePref.setSummary(R.string.settings_vibrate_summary);
        root.addPreference(vibratePref);

        // difficulty level
        ListPreference difficultyPref = new ListPreference(this);
        difficultyPref.setEntries(new String[] {
                getString(R.string.settings_five_lives),
                getString(R.string.settings_three_lives),
                getString(R.string.settings_one_life)});
        difficultyPref.setEntryValues(new String[] {
                Difficulty.Easy.toString(),
                Difficulty.Medium.toString(),
                Difficulty.Hard.toString()});
        difficultyPref.setKey(KEY_DIFFICULTY);
        difficultyPref.setTitle(R.string.settings_difficulty);
        difficultyPref.setSummary(R.string.settings_difficulty_summary);
        final SharedPreferences sharedPrefs =
                PreferenceManager.getDefaultSharedPreferences(this);
        if (!sharedPrefs.contains(KEY_DIFFICULTY)) {
            difficultyPref.setValue(DEFAULT_DIFFICULTY.toString());
        }
        root.addPreference(difficultyPref);
        return root;
    }
}