AndEngine mEngine null reference? - android

I am having some issues with some of the boiler plate code on Android Studio. I was running through the debugger and discovered that mEngine is not initialized and is getting accessed as a null value. I was following this tutorial:
http://www.makethegame.net/android-andengine/how-to-setup-andengine-with-android-studio/
I am not sure how to fix this error since I do not know how to initialize mEngine. Any tips?
public class gameplay extends LayoutGameActivity {
//AndEngine variables//
private Camera camera;
private int CAMERA_WIDTH = 320;
private int CAMERA_HEIGHT = 480;
public Scene currentScene;
//End of AndEngine variables//
//AndEngine boiler plate code//
#Override
protected int getLayoutID() {
return R.layout.activity_gameplay;
}
#Override
protected int getRenderSurfaceViewID() {
return R.id.gameView;
}
#Override
public EngineOptions onCreateEngineOptions() {
this.camera = new Camera(0,0, CAMERA_WIDTH, CAMERA_HEIGHT);
EngineOptions engineOptions = new EngineOptions(true, ScreenOrientation.PORTRAIT_FIXED, new FillResolutionPolicy(), camera);
engineOptions.getAudioOptions().setNeedsMusic(true).setNeedsSound(true);
engineOptions.setWakeLockOptions(WakeLockOptions.SCREEN_ON);
return engineOptions;
}
#Override
public void onCreateResources(OnCreateResourcesCallback pOnCreateResourcesCallback) throws IOException {
pOnCreateResourcesCallback.onCreateResourcesFinished();
}
//ERROR IN THIS METHOD BELOW
#Override
public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback) throws IOException {
mEngine.registerUpdateHandler(new FPSLogger());
//Attempt to read from field 'org.andengine.engine.Engine org.andengine.opengl.view.EngineRenderer.mEngine' on a null object reference
currentScene = new Scene();
currentScene.setBackground(new org.andengine.entity.scene.background.Background(0.09804f, 0.7274f, 0.8f));
}
#Override
public void onPopulateScene(Scene pScene, OnPopulateSceneCallback pOnPopulateSceneCallback) throws IOException {
pOnPopulateSceneCallback.onPopulateSceneFinished();
}
//End of AndEngine boiler plate code//
}
Attached below is my error log:

Is it necessary for you to extend the LayoutGameActivity.
Try BaseGameActivity instead.
Try running your error line
mEngine.registerUpdateHandler(new FPSLogger()); in OnPopulateScene.

Related

SurfaceView and xml

I have program where i use my SurfaceView class. But i want to add ad in my game.To do it i must add xml and use it (i never use xml file and know few about it). Help me pls whith it.
Main Activity on create:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ThisActivity=this;
new Game(this);
setContentView(Game.game);
}
Game:
public class S_Game extends SurfaceView implements CallBack{
public S_Game(Context context){
super(context);
getHolder().addCallback(this);
game=this;
sinh0=false;
sinh1=false;
sinh2=true;
String abas=" "+"";
spacekey=abas.hashCode();
paint=new Paint();
paint.setColor(0xffff0000);
paint.setTextSize(20);
pickx=new AtomicInteger[3];
picky=new AtomicInteger[3];
ifpick0=new AtomicBoolean[3];
for(int i=0;i<3;i++){
pickx[i]=new AtomicInteger();
picky[i]=new AtomicInteger();
ifpick0[i]=new AtomicBoolean();
}
pickt=new AtomicInteger();
NewTimer();
}
public void NewTimer(){
upd=new S_Updater(this);
timer=new Timer();
timer.schedule(upd,250,40);
}
public void Init(){
if(getHeight()>getWidth()){
S_Graff.thisindgraff=0;
}else{
S_Graff.thisindgraff=1;
}
DisplayMetrics metrics = new DisplayMetrics();
MainActivity.ThisActivity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
xdpi=SK(metrics.xdpi);
ydpi=SK(metrics.ydpi);
xdpi=SK(metrics.densityDpi);
float sm=xdpi/3;
float sms=(55/sm);
dpi=sms;
wind=new S_Window(0,0,760,1430);
Board.psize=KonK(18);
Board.DY/=sms;
if(dpi<=0.55){
dpi=0.55f;
}
String s="|";
Board.LINE=s.hashCode();
}
public void Update(Canvas cnv){
if(getHeight()>getWidth()){
maxx=smaxx;
maxy=smaxy;
kx=maxx/getWidth();
ky=maxy/getHeight();
kk=kx;
S_Graff.thisindgraff=0;
debug0=""+maxy+"/"+getHeight();
debug1=""+maxx+"/"+getWidth();
}else{
maxx=smaxy;
maxy=smaxx;
kx=maxx/getWidth();
ky=maxy/getHeight();
kk=ky;
S_Graff.thisindgraff=1;
}
if(binit){LInit();binit=false;}
for(int i=0;i<3;i++){
if(!ifpick0[i].get()){
float px=pickx[i].get();
px/=1000;
float py=picky[i].get();
py/=1000;
ifpick0[i].set(true);
S_Window.Pick(px,py,i);
}
}
S_Graff.OnRotAll();
cnv.drawColor(0xffffffff);
//I draw all S_Graffs in Update
S_Graff.Update(cnv);
Board.UpdateText(cnv);
}
#Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {}
#Override
public void surfaceCreated(SurfaceHolder holder) {
//new Timer().schedule(upd,250,40);
/*Canvas c = getHolder().lockCanvas();
Update(c);
getHolder().unlockCanvasAndPost(c);*/
}
#Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
}
S_Updater:
public class S_Updater extends TimerTask{
public S_Game game;
public SurfaceHolder surfaceHolder;
static boolean isrun=true,ispause;
public S_Updater(S_Game g) {
game=g;
surfaceHolder=g.getHolder();
}
#Override
public void run() {
Canvas canvas=null;
try {
synchronized (surfaceHolder) {
if(surfaceHolder.getSurface().isValid()){
canvas=surfaceHolder.lockCanvas(null);
if(canvas!=null){
game.Update(canvas);
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
}
finally {}
}
}

why arent my ITextureRegions being displayed on my scene

I'm just learning AndEngine Anchor center and I'm working my way through the cookbook. However I'm having some trouble with loading the images to the screen (code compiles fine). Trying to load 3 rectangles(30x40, 40x30,70x50) in the oncreateResources method, code compiles, but does not display images.Thanks
public class GameActivity extends BaseGameActivity {
// The following constants will be used to define the width and height
// of our game's camera view
private static final int WIDTH = 800;
private static final int HEIGHT = 480;
// Declare a Camera object for our activity
private Camera mCamera;
// Declare a Scene object for our activity
private Scene mScene;
#Override
public EngineOptions onCreateEngineOptions() {
// Define our mCamera object
mCamera = new Camera(0, 0, WIDTH, HEIGHT);
// Declare & Define our engine options to be applied to our Engine
// object
EngineOptions engineOptions = new EngineOptions(true,
ScreenOrientation.LANDSCAPE_FIXED, new FillResolutionPolicy(),
mCamera);
engineOptions.setWakeLockOptions(WakeLockOptions.SCREEN_ON);
return engineOptions;
}
#Override
public void onCreateResources(
OnCreateResourcesCallback pOnCreateResourcesCallback) {
BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
BitmapTextureAtlas mBitmapTextureAtlas = new BitmapTextureAtlas(mEngine.getTextureManager(), 120, 120);
ITextureRegion mRetangleOneTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mBitmapTextureAtlas, this, "rectangle_one.png", 10, 10);
ITextureRegion mRetangleTwoTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mBitmapTextureAtlas, this, "rectangle_two.png", 50, 10);
ITextureRegion mRetangleThreeTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mBitmapTextureAtlas, this, "rectangle_three.png", 10, 60);
mBitmapTextureAtlas.load();
pOnCreateResourcesCallback.onCreateResourcesFinished();
}
#Override
public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback) {
mScene = new Scene();
pOnCreateSceneCallback.onCreateSceneFinished(mScene);
}
#Override
public void onPopulateScene(Scene pScene,
OnPopulateSceneCallback pOnPopulateSceneCallback) {
pOnPopulateSceneCallback.onPopulateSceneFinished();
}
}
I haven't used the center anchor branch yet, but your problem seems to be that you need to create sprites with the loaded ITextures. Then, you need to attach those sprites in the scene.

How to avoid reinitialization of variable in Live Wallpaper

I have the following Live Wallpaper:
public class GLWallpaperVideoDemo extends GLWallpaperService {
public static final String folder = "video";
public static final String TAG = "GLWVD";
public static String videoName="VIDEOWALL.avi";
//video variables
public int videoWidth,videoHeight;
public boolean videoWideScreen=false;
VideoRenderer renderer = null;
public GLWallpaperVideoDemo() {
super();
Log.e(TAG,"constructor()");
}
#Override
public void onCreate() {
Log.e(TAG,"onCreate()");
super.onCreate();
//transfer video to sdcard
Log.d(TAG,"transferring video asset to sdcard");
copyVideoToCard();
Log.d(TAG,"transferred");
//if videoName == blankVideo, then don't load anything
//TODO
NativeCalls.initVideo();
Log.d(TAG,"Opening video");
NativeCalls.loadVideo("file:/"+"sdcard/"
+GLWallpaperVideoDemo.videoName);
//set video dimensions (now that we opened the video)
videoWidth = NativeCalls.getVideoWidth();
videoHeight = NativeCalls.getVideoHeight();
videoWideScreen = ( videoWidth > videoHeight ) ? true : false;
}
private VideoEngine mEngine=null;
#Override
public Engine onCreateEngine() {
Log.e(TAG,"onCreateEngine()");
mEngine = new VideoEngine();
return mEngine;
}
class VideoEngine extends GLEngine {
VideoEngine() {
super();
Log.e(TAG,"VideoEngine VideoEngine()");
if(renderer==null)renderer = new VideoRenderer(GLWallpaperVideoDemo.this,
this);
setRenderer(renderer);
//setRenderMode(RENDERMODE_WHEN_DIRTY);
setRenderMode(RENDERMODE_CONTINUOUSLY);
}
VideoRenderer getRenderer() { return renderer; }
}
}
And this is the renderer:
public class VideoRenderer implements GLWallpaperService.Renderer {
static private String TAG="Renderer>>>>>>>>>>>>";
static boolean runOnce = false;
//MediaPlayer mediaPlayer = MediaPlayer.create(MyApp.getContext(), R.raw.gunfireusedforboardstage);
//screen variables
int screenWidth=50,screenHeight=50;
int drawWidth, drawHeight; //dimensions of fit-to-screen video
int paddingX, paddingY; //padding for fit-to-screen-video
//texture variables
int powWidth,powHeight;
//pointers
GLWallpaperVideoDemo mParent;
GLWallpaperVideoDemo.VideoEngine mParentEngine;
//lock
static public Object lock = new Object();
//fps
long fpsTime;
public int framecount;
public VideoRenderer() {
super();
Log.e(TAG,"Constructor()");
}
public VideoRenderer(GLWallpaperVideoDemo p,
GLWallpaperVideoDemo.VideoEngine e) {
super();
mParent = p;
mParentEngine = e;
Log.e(TAG,"constructor()");
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
Log.e(TAG, "onSurfaceCreated()");
}
void process(int width, int height) {
setScreenDimensions( width, height );
Log.d(TAG,"Killing texture");
NativeCalls.closeOpenGL();
setTextureDimensions( screenWidth, screenHeight );
setFitToScreenDimensions( mParent.videoWidth,
mParent.videoHeight );
if ( !runOnce ) {
Log.e(TAG,"Preparing frame");
NativeCalls.prepareStorageFrame();
}
NativeCalls.initOpenGL();
runOnce = true;
}
//This gets called whenever you preview the wallpaper or set the
//wallpaper
public void onSurfaceChanged(GL10 gl, int width, int height) {
Log.e(TAG,"onSurfaceChanged()");
synchronized(lock) {
process(width, height);
}
}
public void onDrawFrame(GL10 gl) {
synchronized(lock) {
//Log.d(TAG,"Drawing ....");
NativeCalls.getFrame(); // from video
NativeCalls.drawFrame(); // using openGL
if(framecount>300)framecount=0;
framecount++;
//Log.e("framecount",Integer.toString(framecount));
if(framecount==117 || framecount==124 ||framecount==137 ||framecount==145||framecount==159||framecount==167)
{new Thread(new Runnable() {
public void run() {
MediaPlayer mp= MediaPlayer.create(MyApp.getContext(), R.raw.gunfireusedforboardstage);
mp.start();
mp.setOnCompletionListener(new OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
mp.release();
};
});
}
}).start();}
if (MyDebug.showFPS) {
final float fpsRate;
fpsRate = 1000f/((float) (SystemClock.uptimeMillis()
- fpsTime) );
fpsTime = SystemClock.uptimeMillis();
Log.d(TAG,
TAG+"drawFrame(): fps: "
+String.valueOf(fpsRate)
);
}
}
}
Now you see the variable framecount inside the renderer?
It gets reinitialized every time open the settings of the Wallpaper !!!
The result is that the renderer continues its work, but framecount is set again to 0,
the consequence is that the frames are not in sync with the MediaPlayer anymore.
SOLVED:
I made the variable static :-)

Andengine Troubles, Nothing showing on screen? SimpleBaseGameActivity

I have this code:
public class GameActivity extends SimpleBaseGameActivity{
static final int CAMERA_WIDTH = 800;
static final int CAMERA_HEIGHT = 480;
public Font mFont;
public Camera mCamera;
public Scene mCurrentScene;
public static BaseActivity instance;
#Override
public EngineOptions onCreateEngineOptions() {
// TODO Auto-generated method stub
instance = this;
mCamera = new Camera(0,0, CAMERA_WIDTH, CAMERA_HEIGHT);
return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera);
}
#Override
protected void onCreateResources() {
// TODO Auto-generated method stub
mFont = FontFactory.create(this.getFontManager(), this.getTextureManager(), 256, 256, Typeface.create(Typeface.DEFAULT, Typeface.BOLD), 32);
mFont.load();
}
#Override
protected Scene onCreateScene() {
// TODO Auto-generated method stub
mEngine.registerUpdateHandler(new FPSLogger());
mCurrentScene = new Scene();
mCurrentScene.setBackground(new Background(0.09804f, 0.7274f, 0.8f));
return mCurrentScene;
}
}
My Whole goal is to just get something on the screen, just a simple bitmap. Ive followed a bunch of tutorials on andengine on youtube and google, but for some reason when i start the basegameactivity it doesnt display anything at all just a blank white screen. I also downloaded an example from github and copied and pasted the code and the example gave me the same thing just a blank white screen. Can anyone help me? Id appreciate it :]
I think you are using GLES2 andengine branch and may be your phone is not supporting GLES2.

Basic Sprite not loading - AndEngine

Hello I have just started with AndEngine. I have been working with a tutorial here. I thought it was pretty straightforward but I can't seem to get it to work properly. The purpose is simply to display a simple Sprite. I did the code precisely how the tutorial instructed but when I run the game, nothing loads at all. I threw in some Log.i statements and it doesn't appear that any of the basic methods (OnCreateResources etc...) run at all. I'm not getting any errors but the nothing is running either. Does anyone know what I am doing wrong?
(I hope this isn't a stupid question) Code is below:
public class GameMain extends BaseGameActivity {
Scene scene;
protected static final int CAMERA_WIDTH = 800;
protected static final int CAMERA_HEIGHT = 480;
BitmapTextureAtlas playerTexture;
ITextureRegion playerTextureRegion;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_main);
Log.i("TEST", "CREATE GAME");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.game_main, menu);
return true;
}
#Override
public EngineOptions onCreateEngineOptions() {
// TODO Auto-generated method stub
Camera mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
EngineOptions options = new EngineOptions(true,
ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(
CAMERA_WIDTH, CAMERA_HEIGHT), mCamera);
return options;
}
#Override
public void onCreateResources(
OnCreateResourcesCallback pOnCreateResourcesCallback)
throws Exception {
// TODO Auto-generated method stub
Log.i("TEST", "LOADING GFX");
loadGFX();
pOnCreateResourcesCallback.onCreateResourcesFinished();
}
private void loadGFX() {
// TODO Auto-generated method stub
Log.i("TEST", "LOAD GFX");
BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
playerTexture = new BitmapTextureAtlas(getTextureManager(), 64, 64);
playerTextureRegion = BitmapTextureAtlasTextureRegionFactory
.createFromAsset(playerTexture, this, "star.png", 0, 0);
playerTexture.load();
}
#Override
public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback)
throws Exception {
// TODO Auto-generated method stub
Log.i("TEST", "Scene Background");
this.scene = new Scene();
this.scene.setBackground(new Background(0, 125, 58));
pOnCreateSceneCallback.onCreateSceneFinished(this.scene);
}
#Override
public void onPopulateScene(Scene pScene,
OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception {
// TODO Auto-generated method stub
Sprite sPlayer = new Sprite(CAMERA_WIDTH / 2, CAMERA_HEIGHT / 2,
playerTextureRegion,
this.mEngine.getVertexBufferObjectManager());
sPlayer.setRotation(45.0f);
this.scene.attachChild(sPlayer);
pOnPopulateSceneCallback.onPopulateSceneFinished();
}
}
in a short look at the tutorial, i didn't see anything about overwriting the onCreate method, esp. the setContentView part could be wrong.
makes me wonder, that none of the Log.i calls appear in your log, did you set your log to a higher level than info?
let me take a deeper look, if these two hints where not right ;-)

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