Need help on Android car game [closed] - andengine

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I'm developing a 2D car game for my University project.
I have developed it up to the point that user's car can move and traffic cars come from above. But I have no clue about how to destroy the user's car when it collied with a traffic car. Can anyone tell how to detect collision and after that how to destroy it.
public class MainActivity extends BaseGameActivity{
Scene scene; // declare a scene object
protected static final float CAMERA_WIDTH = 800; // define camera width
protected static final float CAMERA_HEIGHT = 520; //define camera height
/*----- background -----------*/
BitmapTextureAtlas backbitmapTextureAtlas; // declare a bitmap texture
ITextureRegion backiTextureRegion; // declare a i texture region to hold image
Sprite backsPlayer; // sprite to display the image
PhysicsWorld backpWorld;
SensorManager backsensor;
Vector2 backvec;
ITexture backparallax_background;
protected VertexBufferObjectManager backvbom;
org.andengine.engine.camera.Camera camera;
/*----- /background -----------*/
/*----user's car---------*/
BitmapTextureAtlas bitmapTextureAtlas;
ITextureRegion iTextureRegion;
Vector2 vec;
PhysicsWorld pWorld;
SensorManager sensor;
Sprite sPlayer;
/*----/user's car---------*/
/*------ traffic cars----------*/
BitmapTextureAtlas bitmapTextureAtlasTraffic1;
ITextureRegion iTextureRegionTraffic1;
Sprite sPlayerTraffic1;
BitmapTextureAtlas bitmapTextureAtlasTraffic2;
ITextureRegion iTextureRegionTraffic2;
Sprite sPlayerTraffic2;
BitmapTextureAtlas bitmapTextureAtlasTraffic3;
ITextureRegion iTextureRegionTraffic3;
Sprite sPlayerTraffic3;
BitmapTextureAtlas bitmapTextureAtlasTraffic4;
ITextureRegion iTextureRegionTraffic4;
Sprite sPlayerTraffic4;
MoveXModifier mod1;
MoveXModifier mod2;
MoveXModifier mod3;
MoveXModifier mod4;
/*------ /traffic cars----------*/
#Override
public EngineOptions onCreateEngineOptions() {
// TODO Auto-generated method stub
camera = new org.andengine.engine.camera.Camera(0,0,CAMERA_WIDTH,CAMERA_HEIGHT); // create camera
EngineOptions options= new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH,CAMERA_HEIGHT), camera); //create engine options
return options;
}
#Override
public void onCreateResources(
OnCreateResourcesCallback pOnCreateResourcesCallback)
throws Exception {
// TODO Auto-generated method stub
/* ---------------parallax back code------------------*/
backparallax_background = new AssetBitmapTexture(this.getTextureManager(), this.getAssets(), "gfx/back2.png");
backiTextureRegion = TextureRegionFactory.extractFromTexture(this.backparallax_background);
this.backparallax_background.load();
/* ---------------/parallax back code------------------*/
loadGfx(); // load user's car
loadTraffic();
pOnCreateResourcesCallback.onCreateResourcesFinished();
}
/*--------load traffic cars------------*/
private void loadTraffic() {
// TODO Auto-generated method stub
BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/"); // give the path of image folder
bitmapTextureAtlasTraffic1 = new BitmapTextureAtlas(getTextureManager(), 256, 256);// create a bit map to hold the picture and give size according to the image
iTextureRegionTraffic1 = BitmapTextureAtlasTextureRegionFactory.createFromAsset(bitmapTextureAtlasTraffic1, this, "traffic1.png", 0,0);
bitmapTextureAtlasTraffic1.load();
//----- traffic 2--------------
bitmapTextureAtlasTraffic2 = new BitmapTextureAtlas(getTextureManager(), 256, 256);// create a bit map to hold the picture and give size according to the image
iTextureRegionTraffic2 = BitmapTextureAtlasTextureRegionFactory.createFromAsset(bitmapTextureAtlasTraffic2, this, "traffic2.png", 0,0);
bitmapTextureAtlasTraffic2.load();
//----- traffic 3--------------
bitmapTextureAtlasTraffic3 = new BitmapTextureAtlas(getTextureManager(), 256, 256);// create a bit map to hold the picture and give size according to the image
iTextureRegionTraffic3 = BitmapTextureAtlasTextureRegionFactory.createFromAsset(bitmapTextureAtlasTraffic3, this, "traffic3.png", 0,0);
bitmapTextureAtlasTraffic3.load();
//----- traffic 4--------------
bitmapTextureAtlasTraffic4 = new BitmapTextureAtlas(getTextureManager(), 256, 256);// create a bit map to hold the picture and give size according to the image
iTextureRegionTraffic4 = BitmapTextureAtlasTextureRegionFactory.createFromAsset(bitmapTextureAtlasTraffic4, this, "traffic4.png", 0,0);
bitmapTextureAtlasTraffic4.load();
}
/*--------load user's car------------*/
private void loadGfx() {
// TODO Auto-generated method stub
BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/"); // give the path of image folder
bitmapTextureAtlas = new BitmapTextureAtlas(getTextureManager(), 256, 256);// create a bit map to hold the picture and give size according to the image
iTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(bitmapTextureAtlas, this, "usercar.png", 0,0);
bitmapTextureAtlas.load();
}
/*--------load user's car------------*/
#Override
public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback)
throws Exception {
// TODO Auto-generated method stub
scene = new Scene(); // create the object of scene
/*------ parallax background---------*/
final AutoParallaxBackground auto_background = new AutoParallaxBackground(0, 0, 0, 200);
final Sprite background_sprite = new Sprite(0,0, this.backiTextureRegion,backvbom);
auto_background.attachParallaxEntity(new ParallaxEntity(1.7f,background_sprite));
scene.setBackground(auto_background);
pOnCreateSceneCallback.onCreateSceneFinished(scene);
}
#Override
public void onPopulateScene(Scene pScene,
OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception {
// TODO Auto-generated method stub
// set traffic car1
sPlayerTraffic1 = new Sprite(10,350,iTextureRegionTraffic1,this.mEngine.getVertexBufferObjectManager());
sPlayerTraffic2 = new Sprite(300,280,iTextureRegionTraffic2,this.mEngine.getVertexBufferObjectManager());
sPlayerTraffic3 = new Sprite(400,190,iTextureRegionTraffic3,this.mEngine.getVertexBufferObjectManager());
sPlayerTraffic4 = new Sprite(50,70,iTextureRegionTraffic4,this.mEngine.getVertexBufferObjectManager());
mod1=new MoveXModifier(5,-600,800){
#Override
protected void onModifierFinished(IEntity pItem) {
// TODO Auto-generated method stub
Random r = new Random();
int y = r.nextInt(370-350)+350;// set y randomly
int speed = r.nextInt(3-2)+3; // set speed randomly
sPlayerTraffic1.setY(y); // set y
int x = r.nextInt(800-500)+200; // set x randomly
x = -x;
mod1.reset(speed, x, 800);
super.onModifierFinished(pItem);
}
};// moving down the traffic1 car
mod2=new MoveXModifier(4,200,800){
#Override
protected void onModifierFinished(IEntity pItem) {
// TODO Auto-generated method stub
Random r = new Random();
int y = r.nextInt(300-285)+285; // set y randomly
int speed = r.nextInt(5-3)+3; // set speed randomly
sPlayerTraffic2.setY(y); // set y
int x = r.nextInt(600-200)+200; // set x randomly
x = -x;
mod2.reset(speed, x, 800);
super.onModifierFinished(pItem);
}
};// moving down the traffic2 car
mod3=new MoveXModifier(3,-600,800){
#Override
protected void onModifierFinished(IEntity pItem) {
// TODO Auto-generated method stub
Random r = new Random();
int y = r.nextInt(190-150)+150;
int speed = r.nextInt(3-2)+2;
if(speed == 2){
y = 150;
}
sPlayerTraffic3.setY(y);
int x = r.nextInt(2000-800)+800;
x = -x;
mod3.reset(speed, x, 800);
super.onModifierFinished(pItem);
}
};// moving down the traffic3 car
mod4=new MoveXModifier(3,50,800){
#Override
protected void onModifierFinished(IEntity pItem) {
// TODO Auto-generated method stub
Random r = new Random();
int y = r.nextInt(100-70)+70;
int speed = r.nextInt(3-2)+2;
sPlayerTraffic4.setY(y);
int x = r.nextInt(600-200)+200;
x = -x;
mod4.reset(speed, x, 800);
super.onModifierFinished(pItem);
}
};// moving down the traffic4 car
sPlayerTraffic1.registerEntityModifier(mod1);
sPlayerTraffic2.registerEntityModifier(mod2);
sPlayerTraffic3.registerEntityModifier(mod3);
sPlayerTraffic4.registerEntityModifier(mod4);
//now set the x,y coordination of the image to display the right position we want
sPlayer = new Sprite(500,350,iTextureRegion,this.mEngine.getVertexBufferObjectManager()){ // user's car x,y
// touch event for user's car
#Override
public boolean onAreaTouched(org.andengine.input.touch.TouchEvent pSceneTouchEvent, float pTouchAreaLocalX, float pTouchAreaLocalY)
{
this.setPosition(500 , pSceneTouchEvent.getY());
//website code
this.setPosition(pSceneTouchEvent.getX(),
this.getY());
//Detects if player is outside of bounds
final float width = this.getWidth();
final float height = this.getHeight();
float x = pSceneTouchEvent.getX() - width / 2 ;
float y = pSceneTouchEvent.getY() - height / 2;
if (x < 0)
x = 0;
if (y < 65) // right side of the road
y = 65;
if (x > (CAMERA_WIDTH - width))
x = CAMERA_WIDTH - width;
if (y > (CAMERA_HEIGHT - height-70)) // left side of the road
y = (CAMERA_HEIGHT - height-70);
this.setPosition(500, y);
return true;
}
};
//touch ----------------------------------------------------------
scene.registerTouchArea(sPlayer);
//-----------------------------------------------------------------
this.scene.attachChild(sPlayer);
this.scene.attachChild(sPlayerTraffic1);
this.scene.attachChild(sPlayerTraffic2);
this.scene.attachChild(sPlayerTraffic3);
this.scene.attachChild(sPlayerTraffic4);
pOnPopulateSceneCallback.onPopulateSceneFinished();
}
}

Answer 1

private ContactListener createContactListener()
{
ContactListener contactListener = new ContactListener()
{
#Override
public void beginContact(Contact contact)
{
final Fixture x1 = contact.getFixtureA();
final Fixture x2 = contact.getFixtureB();
if(x1==PlayerBody && x2==EnemyBody){
DestroyMethod();
}
}
};
return contactListener;
}
YourPhysicsWorld.setContactListener(createContactListener());
private void DestroyMethod(){
YourPhysicsWorld.destroyBody(EnemyBody);
}