helper for shared prefs - java version

PreferenceHelper.java

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

/**
 * helper for shared prefs - java version
 */

public class PreferenceHelper {

        private PreferenceHelper() {}

        /**
         * Helper method to retrieve a String value from {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @return The value from shared preferences, or null if the value could not be read.
         */
        public static String getStringPreference(Context context, String key) {
            String value = null;
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                value = preferences.getString(key, null);
            }
            return value;
        }

        /**
         * Helper method to write a String value to {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @return true if the new value was successfully written to persistent storage.
         */
        public static boolean setStringPreference(Context context, String key, String value) {
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null && !TextUtils.isEmpty(key)) {
                SharedPreferences.Editor editor = preferences.edit();
                editor.putString(key, value);
                return editor.commit();
            }
            return false;
        }

        /**
         * Helper method to retrieve a float value from {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @param defaultValue A default to return if the value could not be read.
         * @return The value from shared preferences, or the provided default.
         */
        public static float getFloatPreference(Context context, String key, float defaultValue) {
            float value = defaultValue;
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                value = preferences.getFloat(key, defaultValue);
            }
            return value;
        }

        /**
         * Helper method to write a float value to {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @return true if the new value was successfully written to persistent storage.
         */
        public static boolean setFloatPreference(Context context, String key, float value) {
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                SharedPreferences.Editor editor = preferences.edit();
                editor.putFloat(key, value);
                return editor.commit();
            }
            return false;
        }

        /**
         * Helper method to retrieve a long value from {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @param defaultValue A default to return if the value could not be read.
         * @return The value from shared preferences, or the provided default.
         */
        public static long getLongPreference(Context context, String key, long defaultValue) {
            long value = defaultValue;
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                value = preferences.getLong(key, defaultValue);
            }
            return value;
        }

        /**
         * Helper method to write a long value to {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @return true if the new value was successfully written to persistent storage.
         */
        public static boolean setLongPreference(Context context, String key, long value) {
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                SharedPreferences.Editor editor = preferences.edit();
                editor.putLong(key, value);
                return editor.commit();
            }
            return false;
        }

        /**
         * Helper method to retrieve an integer value from {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @return The value from shared preferences, or the provided default.
         */
        public static int getIntegerPreference(Context context, String key, int defaultValue) {
            int value = defaultValue;
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                value = preferences.getInt(key, defaultValue);
            }
            return value;
        }

        /**
         * Helper method to write an integer value to {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @return true if the new value was successfully written to persistent storage.
         */
        public static boolean setIntegerPreference(Context context, String key, int value) {
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                SharedPreferences.Editor editor = preferences.edit();
                editor.putInt(key, value);
                return editor.commit();
            }
            return false;
        }

        /**
         * Helper method to retrieve a boolean value from {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @param defaultValue A default to return if the value could not be read.
         * @return The value from shared preferences, or the provided default.
         */
        public static boolean getBooleanPreference(Context context, String key, boolean defaultValue) {
            boolean value = defaultValue;
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                value = preferences.getBoolean(key, defaultValue);
            }
            return value;
        }

        /**
         * Helper method to write a boolean value to {@link SharedPreferences}.
         *
         * @param context a {@link Context} object.
         * @return true if the new value was successfully written to persistent storage.
         */
        public static boolean setBooleanPreference(Context context, String key, boolean value) {
            SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
            if (preferences != null) {
                SharedPreferences.Editor editor = preferences.edit();
                editor.putBoolean(key, value);
                return editor.commit();
            }
            return false;
        }
}