ParallaxBackground AndEngine

ParallaxBackground AndEngine

I'm new to game development andengine. I want to add ParallaxBackground
but I don't know how to change background on player move. I'm using arrow
for moving a player. Now my question is where I write the code
parallaxBackground.setParallaxValue(5); I was written this line in
onAreaTouched method of arrow but it not work. please help me. Thanks.
Code
private Camera mCamera;
private static int CAMERA_WIDTH = 800;
private static int CAMERA_HEIGHT = 480;
private BitmapTextureAtlas bgTexture;
private ITextureRegion bgTextureRegion;
@Override
protected void onCreateResources() {
BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
bgTexture = new
BitmapTextureAtlas(getTextureManager(),2160,480,TextureOptions.REPEATING_BILINEAR);
bgTextureRegion =
BitmapTextureAtlasTextureRegionFactory.createFromAsset(bgTexture,
this, "background.png", 0, 0);
bgTexture.load();
}
@Override
protected Scene onCreateScene() {
this.getEngine().registerUpdateHandler(new FPSLogger());
Scene scene = new Scene();
scene.setBackground(new Background(Color.BLACK));
final ParallaxBackground parallaxBackground = new
ParallaxBackground(0, 0, 0);
final VertexBufferObjectManager vertexBufferObjectManager =
this.getVertexBufferObjectManager();
parallaxBackground.attachParallaxEntity(new ParallaxEntity(0.0f, new
Sprite(0, CAMERA_HEIGHT - this.bgTextureRegion.getHeight(),
this.bgTextureRegion, vertexBufferObjectManager)));
scene.setBackground(parallaxBackground);
Robot robot = new Robot();
// add Player
final AnimatedSprite animatedRobotSprite = new
AnimatedSprite(robot.centerX, robot.centerY, 122, 126,
(ITiledTextureRegion) robotTextureRegion,
getVertexBufferObjectManager());
scene.attachChild(animatedRobotSprite);
animatedRobotSprite.animate(new long[]{1250,50,50});
// add right arrow button
Sprite rightArrowSprite = new Sprite(0, CAMERA_HEIGHT-70,
rightArrowTextureRegion, getVertexBufferObjectManager()){
@Override
public boolean onAreaTouched(TouchEvent pSceneTouchEvent,float
pTouchAreaLocalX, float pTouchAreaLocalY) {
switch (pSceneTouchEvent.getAction()) {
case TouchEvent.ACTION_DOWN:
moveRight = true;
parallaxBackground.setParallaxValue(5);
break;
case TouchEvent.ACTION_MOVE:
moveRight = true;
break;
case TouchEvent.ACTION_UP:
moveRight = false;
break;
default:
break;
}
return super.onAreaTouched(pSceneTouchEvent, pTouchAreaLocalX,
pTouchAreaLocalY);
}
};
scene.attachChild(rightArrowSprite);
scene.registerTouchArea(rightArrowSprite);
scene.setTouchAreaBindingOnActionDownEnabled(true);
scene.setTouchAreaBindingOnActionMoveEnabled(true);
scene.registerUpdateHandler(new IUpdateHandler() {
@Override
public void reset() {
}
@Override
public void onUpdate(float pSecondsElapsed) {
if ( moveRight ){
animatedRobotSprite.setPosition(animatedRobotSprite.getX()+speedX,
animatedRobotSprite.getY());
}
}
});
return scene;
}