The Main Activity
As usual, have a main activity that derives from the GLGame class. It is responsible for loading the assets through a call to Assets.load() on startup, as well as pausing and resuming the music when the activity is paused or resumed. As the start screen, just return the MainMenuScreen, which you will implement shortly. One thing to remember is the definition of the activity in the manifest file. Make sure that you have the orientation set to landscape! Listing 12–3 shows you the code.
Listing 12–3. DroidInvaders.java, the Main Activity
package com.badlogic.androidgames.droidinvaders;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import com.badlogic.androidgames.framework.Screen;
import com.badlogic.androidgames.framework.impl.GLGame;
public class DroidInvaders extends GLGame {
boolean firstTimeCreate = true;
@Override
public Screen getStartScreen() {
return new MainMenuScreen(this);
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
super.onSurfaceCreated(gl, config);
if (firstTimeCreate) {
Settings.load(getFileIO());
Assets.load(this);
firstTimeCreate = false;
} else {
Assets.reload();
}
}
@Override
public void onPause() {
super.onPause();
if (Settings.soundEnabled)
Assets.music.pause();
}
}
This is exactly the same as in Super Jumper. On a call to getStartScreen(), return a new instance of the MainMenuScreen that you'll write next. In onSurfaceCreated(), make sure your assets are reloaded, and in onPause(), pause the music if it is playing.
As you can see, there are a lot of things that can be repeated once you have a good idea how to approach the implementation of a simple game. Think about how you could reduce the boilerplate code even more by moving things to the framework!