An Android Game Development Framework - Beginning Android Games - page 192

public SharedPreferences getPreferences() {
return PreferenceManager.getDefaultSharedPreferences(context);
}
}
Everything is straightforward. We implement the FileIO interface, store the Context instance,
which is the gateway to almost everything in Android, store an AssetManager , which we pull
from the Context , store the external storage's path, and implement the four methods based on
this path. Finally, we pass through any IOException is that get thrown so we'll know if anything is
irregular on the calling side.
Our Game interface implementation will hold an instance of this class and return it via
Game.getFileIO() . This also means that our Game implementation will need to pass through the
Context in order for the AndroidFileIO instance to work.
Note that we do not check if the external storage is available. If it's not available, or if we forget
to add the proper permission to the manifest file, we'll get an exception, so checking for errors is
implicit. Now, we can move on to the next piece of our framework, which is audio.
AndroidAudio, AndroidSound, and AndroidMusic:
Crash, Bang, Boom!
In Chapter 3, we designed three interfaces for all our audio needs: Audio , Sound , and Music .
Audio is responsible for creating sound and Music instances from asset files. Sound lets us play
back sound effects that are stored in RAM, and Music streams bigger music files from the disk
to the audio card. In Chapter 4, you learned which Android APIs are needed to implement this.
We will start with the implementation of AndroidAudio , as shown in Listing 5-2, interspersed with
explanatory text where appropriate.
Listing 5-2. AndroidAudio.java; Implementing the Audio Interface
package com.badlogic.androidgames.framework.impl;
import java.io.IOException;
import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.media.AudioManager;
import android.media.SoundPool;
import com.badlogic.androidgames.framework.Audio;
import com.badlogic.androidgames.framework.Music;
import com.badlogic.androidgames.framework.Sound;
public class AndroidAudio implements Audio {
AssetManager assets;
SoundPool soundPool;