[android] Preference設定ヘルパークラス

Settings.java

import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;

public class Settings {
    // TODO: ここに各設定のGetter/Setterを追加
    
    /**
     * ヘルパーメソッド
     **/
    private static void saveBooleanValue(Context context, String key, boolean enabled) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putBoolean(key, enabled);
        editor.apply();
    }

    private static boolean restoreBooleanValue(Context context, String key, boolean defaultValue) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        return sharedPreferences.getBoolean(key, defaultValue);
    }

    private static void saveIntValue(Context context, String key, int value) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putInt(key, value);
        editor.apply();
    }

    private static int restoreIntValue(Context context, String key, int defaultValue) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        return sharedPreferences.getInt(key, defaultValue);
    }

    private static void saveLongValue(Context context, String key, long value) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putLong(key, value);
        editor.apply();
    }

    private static long restoreLongValue(Context context, String key, long defaultValue) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        return sharedPreferences.getLong(key, defaultValue);
    }

    private static void saveFloatValue(Context context, String key, float value) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putFloat(key, value);
        editor.apply();
    }

    private static float restoreFloatValue(Context context, String key, float defaultValue) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        return sharedPreferences.getFloat(key, defaultValue);
    }

    private static void saveDoubleValue(Context context, String key, double value) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putLong(key, Double.doubleToRawLongBits(value));
        editor.apply();
    }

    private static double restoreDoubleValue(Context context, String key, double defaultValue) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        return Double.longBitsToDouble(
                sharedPreferences.getLong(key, Double.doubleToLongBits(defaultValue)));
    }

    public static void saveStringValue(Context context, String key, String value) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(key, value);
        editor.apply();
    }

    public static String restoreStringValue(Context context, String key, String defaultValue) {
        SharedPreferences sharedPreferences
                = PreferenceManager.getDefaultSharedPreferences(context);
        return sharedPreferences.getString(key, defaultValue);
    }
}