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.DateFormat; 23 import java.text.SimpleDateFormat; 24 import java.util.Date; 25 26 /** 27 * A simple logger that uses shared preferences to log messages, their reads 28 * and replies. Don't use this in a real world application. This logger is only 29 * used for displaying the messages in the text view. 30 */ 31 class MessageLogger { 32 33 private static final String PREF_MESSAGE = "MESSAGE_LOGGER"; 34 private static final DateFormat DATE_FORMAT = SimpleDateFormat.getDateTimeInstance(); 35 private static final String LINE_BREAKS = "\n\n"; 36 37 public static final String LOG_KEY = "message_data"; 38 logMessage(Context context, String message)39 public static void logMessage(Context context, String message) { 40 SharedPreferences prefs = getPrefs(context); 41 message = DATE_FORMAT.format(new Date(System.currentTimeMillis())) + ": " + message; 42 prefs.edit() 43 .putString(LOG_KEY, prefs.getString(LOG_KEY, "") + LINE_BREAKS + message) 44 .apply(); 45 } 46 getPrefs(Context context)47 public static SharedPreferences getPrefs(Context context) { 48 return context.getSharedPreferences(PREF_MESSAGE, Context.MODE_PRIVATE); 49 } 50 getAllMessages(Context context)51 public static String getAllMessages(Context context) { 52 return getPrefs(context).getString(LOG_KEY, ""); 53 } 54 clear(Context context)55 public static void clear(Context context) { 56 getPrefs(context).edit().remove(LOG_KEY).apply(); 57 } 58 } 59