Android Open Source - feup-lpoo-android-tower-defense Music Player

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Back to project page feup-lpoo-android-tower-defense.

License

The source code is released under:

MIT License

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Java Source Code

package pt.up.fe.lpoo.towerdefense;
/*w w  w  . jav  a2s  .co m*/
import pt.up.fe.lpoo.framework.Music;

/**
 * This class serves as a handler for the application's music, allowing the themes to be easily swapped and providing
 *  fade out and fade in effects for smooth transitions between songs
 *  
 * @author Joao Marinheiro
 * @author Luis Cleto
 */
public class MusicPlayer {
  /** current theme being played */
  public static Music currentTheme = null;
  private static Music nextTheme = null;
  private static boolean changingThemes = false;
  private static boolean resettingSound = false;
  /** Volume for the background music */
  public static final float MAX_VOLUME = 0.85f;
  private static float currentVolume = 0.85f;
  /** Volume for game sounds */
  public static float SOUNDS_VOLUME = 0.5f;

  /**
   * Sets a new theme to be played next and toggles the theme transition
   * @param newTheme theme to be played
   */
  public static void changeCurrentTheme(Music newTheme){
    if(newTheme.equals(currentTheme))
      return;
    if(currentTheme != null){
      nextTheme = newTheme;
      changingThemes = true;
    }
    else{
      currentTheme = newTheme;
      currentTheme.setVolume(MAX_VOLUME);
      currentTheme.play();
    }
  }

  /**
   * Handles the theme transition to make it smooth by lowering the volume of the current theme before stopping it
   *  and increasing the volume of the new theme until it reaches the preset volume
   * @param deltaTime time elapsed since the last update
   */
  public static void update(float deltaTime){
    if(changingThemes){
      currentVolume -= deltaTime/100.0f;
      if(currentVolume <= 0){
        currentTheme.stop();
        currentTheme.setVolume(0);
        currentTheme = nextTheme;
        nextTheme = null;
        changingThemes = false;
        resettingSound = true;
        currentTheme.setVolume(0);
        currentTheme.play();
      }
      else{
        currentTheme.setVolume(currentVolume);
      }
    }
    else if(resettingSound){
      currentVolume += deltaTime/100.0f;
      if(currentVolume >= MAX_VOLUME){
        currentVolume = MAX_VOLUME;
        resettingSound = false;
      }
      currentTheme.setVolume(currentVolume);
    }
  }
}

Java Source Code List