1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.messagingservice; 18 19 import android.content.Context; 20 import android.content.SharedPreferences; 21 22 import java.text.SimpleDateFormat; 23 import java.util.Date; 24 25 /** 26 * A simple logger that uses shared preferences to log messages, their reads 27 * and replies. Don't use this in a real world application. This logger is only 28 * used for displaying the messages in the text view. 29 */ 30 public class MessageLogger { 31 32 private static final String PREF_MESSAGE = "MESSAGE_LOGGER"; 33 private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 34 35 public static final String LOG_KEY = "message_data"; 36 public static final String LINE_BREAKS = "\n\n"; 37 38 public static void logMessage(Context context, String message) { 39 SharedPreferences prefs = getPrefs(context); 40 message = DATE_FORMAT.format(new Date(System.currentTimeMillis())) + ": " + message; 41 prefs.edit() 42 .putString(LOG_KEY, prefs.getString(LOG_KEY, "") + LINE_BREAKS + message) 43 .apply(); 44 } 45 46 public static SharedPreferences getPrefs(Context context) { 47 return context.getSharedPreferences(PREF_MESSAGE, Context.MODE_PRIVATE); 48 } 49 50 public static String getAllMessages(Context context) { 51 return getPrefs(context).getString(LOG_KEY, ""); 52 } 53 54 public static void clear(Context context) { 55 getPrefs(context).edit().remove(LOG_KEY).apply(); 56 } 57 } 58