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JumpingJack / src / com.example.android.wearable.jumpingjack /

Utils.java

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/*
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 * Copyright (C) 2014 Google Inc. All Rights Reserved.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.wearable.jumpingjack;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.os.Vibrator;
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import android.preference.PreferenceManager;
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/**
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 * A utility class for some helper methods.
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 */
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public class Utils {
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    private static final int DEFAULT_VIBRATION_DURATION_MS = 200; // in millis
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    private static final String PREF_KEY_COUNTER = "counter";
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    /**
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     * Causes device to vibrate for the given duration (in millis). If duration is set to 0, then it
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     * will use the <code>DEFAULT_VIBRATION_DURATION_MS</code>.
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     */
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    public final static void vibrate(Context context, int duration) {
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        if (duration == 0) {
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            duration = DEFAULT_VIBRATION_DURATION_MS;
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        }
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        Vibrator v = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
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        v.vibrate(duration);
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    }
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    /**
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     * Saves the counter value in the preference storage. If <code>value</code>
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     * is negative, then the value will be removed from the preferences.
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     */
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    public static void saveCounterToPreference(Context context, int value) {
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        SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context);
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        if (value < 0) {
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            // we want to remove
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            pref.edit().remove(PREF_KEY_COUNTER).apply();
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        } else {
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            pref.edit().putInt(PREF_KEY_COUNTER, value).apply();
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        }
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    }
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    /**
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     * Retrieves the value of counter from preference manager. If no value exists, it will return
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     * <code>0</code>.
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     */
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    public static int getCounterFromPreference(Context context) {
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        SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context);
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        return pref.getInt(PREF_KEY_COUNTER, 0);
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    }
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}
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