Move a ball with the accelerometer andengine - andengine

Question

I had written a code to move a ball with the help of accelerometer andengine, but i get force close.
My problem is the use of PhysicsWorld.
My library is:
andengine.jar
andenginephysicsbox2dextension.jar
my code is:
public class SnakeGameActivity extends BaseGameActivity implements IAccelerometerListener
{
private static final int CAMERA_WIDTH = 480;
private static final int CAMERA_HEIGHT = 320;
private float mGravityX;
private float mGravityY;
private Sprite splash ;
private final Vector2 mTempVector = new Vector2();
protected PhysicsWorld mPhysicsWorld;
private Camera mCamera;
private Texture mTexture;
private TextureRegion mSplashTextureRegion;
#Override
public Engine onLoadEngine() {
// TODO Auto-generated method stub
this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
return new Engine(new EngineOptions(true, ScreenOrientation.LANDSCAPE,
new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), this.mCamera));
}
#Override
public void onLoadResources() {
// TODO Auto-generated method stub
this.mTexture = new Texture(512, 512, TextureOptions.BILINEAR_PREMULTIPLYALPHA);
this.enableAccelerometerSensor(this);
this.mSplashTextureRegion = TextureRegionFactory.createFromAsset(this.mTexture, this, "ball_enemy.png", 0, 0);
this.mEngine.registerUpdateHandler(new FPSLogger());
this.mEngine.getTextureManager().loadTexture(this.mTexture);
}
#Override
public Scene onLoadScene() {
this.mEngine.registerUpdateHandler(new FPSLogger());
Scene scene = new Scene(1);
this.mPhysicsWorld = new PhysicsWorld(new Vector2(0, SensorManager.GRAVITY_EARTH), false);
final int centerX = (CAMERA_WIDTH - this.mSplashTextureRegion.getWidth()) / 2;
final int centerY = (CAMERA_HEIGHT - this.mSplashTextureRegion.getHeight()) / 2;
splash = new Sprite(centerX, centerY, this.mSplashTextureRegion);
scene.getLastChild().attachChild(splash);
scene.registerUpdateHandler(this.mPhysicsWorld);
return scene;
}
#Override
public void onLoadComplete() {
// TODO Auto-generated method stub
}
public void onAccelerometerChanged(AccelerometerData pAccelerometerData) {
final Vector2 gravity = Vector2Pool.obtain(pAccelerometerData.getX(), pAccelerometerData.getY());
this.mPhysicsWorld.setGravity(gravity);
Vector2Pool.recycle(gravity);
}
}
my log error:
02-25 21:08:22.334: E/ActivityManager(69): Start proc com.android.deskclock for
broadcast com.android.deskclock/.AlarmInitReceiver: pid=255 uid=10019 gids={}
CPU usage from 16953ms to 19171ms later:
Thank you very much for your help