1 /* 2 * Copyright (C) 2014 Google Inc. All Rights Reserved. 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.wearable.jumpingjack; 18 19 import android.content.Context; 20 import android.content.SharedPreferences; 21 import android.os.Vibrator; 22 import android.preference.PreferenceManager; 23 24 /** 25 * A utility class for some helper methods. 26 */ 27 public class Utils { 28 29 private static final int DEFAULT_VIBRATION_DURATION_MS = 200; // in millis 30 private static final String PREF_KEY_COUNTER = "counter"; 31 32 /** 33 * Causes device to vibrate for the given duration (in millis). If duration is set to 0, then it 34 * will use the <code>DEFAULT_VIBRATION_DURATION_MS</code>. 35 */ 36 public final static void vibrate(Context context, int duration) { 37 if (duration == 0) { 38 duration = DEFAULT_VIBRATION_DURATION_MS; 39 } 40 Vibrator v = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE); 41 v.vibrate(duration); 42 } 43 44 /** 45 * Saves the counter value in the preference storage. If <code>value</code> 46 * is negative, then the value will be removed from the preferences. 47 */ 48 public static void saveCounterToPreference(Context context, int value) { 49 SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); 50 if (value < 0) { 51 // we want to remove 52 pref.edit().remove(PREF_KEY_COUNTER).apply(); 53 } else { 54 pref.edit().putInt(PREF_KEY_COUNTER, value).apply(); 55 } 56 } 57 58 /** 59 * Retrieves the value of counter from preference manager. If no value exists, it will return 60 * <code>0</code>. 61 */ 62 public static int getCounterFromPreference(Context context) { 63 SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); 64 return pref.getInt(PREF_KEY_COUNTER, 0); 65 } 66 67 } 68
