Convert volume from 0-100 integer, which corresponds to what a user sees in the UI, to a 0-1 float - Android Media

Android examples for Media:Media Volume

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Description

Convert volume from 0-100 integer, which corresponds to what a user sees in the UI, to a 0-1 float

Demo Code

/*******************************************************************************
 * Copyright (c) 2013 See AUTHORS file./*from w w w  . j  av a 2 s. c o m*/
 * 
 * This file is part of SleepFighter.
 * 
 * SleepFighter is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * SleepFighter is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with SleepFighter. If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
//package com.java2s;

public class Main {
    /**
     * Convert volume from 0-100 integer, which corresponds to what a user sees
     * in the UI, to a 0-1 float, which MediaPlayer uses 
     * ({@link MediaPlayer#setVolume(float, float)}).
     * <p>
     * The scaling method used is to approximate using x^3 as described by
     * Alexander Thomas
     * <a href="http://www.dr-lex.be/info-stuff/volumecontrols.html">here</a>.
     * </p>
     * 
     * @param volume
     *            the volume in the range 0-100
     * @return the scaled volume in the range 0-1
     */
    public static float convertUIToFloatVolume(int volume) {
        float f = volume / 100f;
        float powEstimate = (float) Math.pow(f, 3);
        return powEstimate;
    }
}

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