com.openquartz.glassmemo.Utils.java Source code

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Here is the source code for com.openquartz.glassmemo.Utils.java

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/**
 * OpenQuartz Memo for Glass
 * Github - https://github.com/jaredsburrows/OpenQuartz
 * @author Andre Compagno
 * 
 * Copyright (C) 2014 OpenQuartz
 *
 * 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.openquartz.glassmemo;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;

import com.google.android.glass.widget.CardScrollView;

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

public class Utils {
    public static CardScrollView cardScroll;

    /**
     * Checks if there exists an object in shared preferences with the chosen key
     * @param context
     * @param key
     * @return
     */
    public static boolean checkForObjectInSharedPrefs(final Context context, final String key) {
        return PreferenceManager.getDefaultSharedPreferences(context).contains(key);
    }

    public static void commitNewMemoList(final Context context, final String key, final List<String> memoList) {
        SharedPreferences.Editor sharedPrefEditor = PreferenceManager.getDefaultSharedPreferences(context).edit();

        if (!memoList.isEmpty()) {
            sharedPrefEditor.putString(key, new JSONArray(memoList).toString());
        } else {
            sharedPrefEditor.putString(key, null);
        }

        sharedPrefEditor.commit();
    }

    /**
     * Gets the arraylist from shared preferences 
     * @param context
     * @param key
     * @return
     */
    public static ArrayList<String> getStringArrayPref(final Context context, String key) {

        SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(context);
        String json = sharedPref.getString(key, null);
        ArrayList<String> memoList = new ArrayList<String>();

        if (json != null) {
            try {
                JSONArray a = new JSONArray(json);

                for (int i = 0; i < a.length(); i++) {
                    memoList.add(a.optString(i));
                }
            } catch (JSONException e) {
            }
        }

        return memoList;
    }

    /**
     * Deletes an item from the list stored in shared preferences 
     * @param index
     * @param context
     * @param key
     */
    public static void deleteMemoAtIndex(int index, Context context, String key) {
        ArrayList<String> memoList = new ArrayList<String>(getStringArrayPref(context, key));
        memoList.remove(index);
        commitNewMemoList(context, key, memoList);
    }

}