Implementing SurfaceGestureDetector Example Andengine

 

call this method in on loadScene( )

private void setupGestureDetaction(){

  SurfaceGestureDetector surfaceGestureDetector = new SurfaceGestureDetector(1f) {

   @Override

   protected boolean onSwipeUp() {

    System.out.println("onSwipeUp");

    return true;

   }

   @Override

   protected boolean onSwipeRight() {

    System.out.println("onSwipeRight");

    return true;

   }

   @Override

   protected boolean onSwipeLeft() {

    System.out.println("onSwipeLeft");

    return true;

   }

   @Override

   protected boolean onSwipeDown() {

    System.out.println("onSwipeDown");

    return true;

   }

   @Override

   protected boolean onSingleTap() {

    System.out.println("onSingleTap");

    return true;

   }

   @Override

   protected boolean onDoubleTap() {

    System.out.println("onDoubleTap");

    return true;

   }

   @Override

   public boolean onManagedTouchEvent(TouchEvent pSceneTouchEvent) {    

    return super.onManagedTouchEvent(pSceneTouchEvent);

   }

   @Override

   public boolean onSceneTouchEvent(Scene pScene,

     TouchEvent pSceneTouchEvent) {    

    return super.onSceneTouchEvent(pScene, pSceneTouchEvent);

   }

  };

  surfaceGestureDetector.setEnabled(true);

  mScene.setOnSceneTouchListener(surfaceGestureDetector);

}

 

 

How are the Android Market ratings (stars) calculated?

I was wondering that how Android market calculate rating (stars) for apps. Here see it is really very simple to calculate

see the image for detail

SUMPRODUCT(A2:A6,B2:B6) / SUM(B2:B6)

Tags: rating, android market, comments

get angle between two points

Hi,

In this post I am going to tell you how to get angle between two points.

private float Xlocal = 0.0f;

private float Ylocal = 0.0f;

private float X = 0;

private float Y = 0;

private float velocity = 50f;

@Override

    public boolean onSceneTouchEvent(Scene pScene, TouchEvent pSceneTouchEvent) {

        if (pSceneTouchEvent.isActionDown()) {            

            Xlocal = pSceneTouchEvent.getX();

            Ylocal = pSceneTouchEvent.getY();

        } else if (pSceneTouchEvent.isActionUp()) {

            X = (pSceneTouchEvent.getX() - Xlocal);

            Y = (pSceneTouchEvent.getY() - Ylocal);

            float angleRad =(float)Math.atan2(Y, X);                    

                float Vx = velocity * (float)Math.cos(angleRad);

                float Vy = velocity * (float)Math.sin(angleRad);

            //Now you can apply force or set velocity in direction Vx and Vy

        }

        return true;        

    }

Helpful post:

http://stackoverflow.com/questions/9372909/linearimpulse-slows-down-on-pressing-power-button-andengine-box2d

 

Tags:

shoot at angle, angle between two points, how to get angle between two points andengine android

Animate in reverse order Andengine

private int mAnimationDirection;

private int calculateCurrentFrameIndex() {

        final long animationProgress = this.mAnimationProgress;

        final long[] frameEnds = this.mFrameEndsInNanoseconds;

        final int frameCount = this.mFrameCount;

        for(int i = 0; i < frameCount; i++) {

                if(frameEnds[i] > animationProgress) {

                        return i * mAnimationDirection;

                }

        }

        return (frameCount - 1) * mAnimationDirection;

}

public AnimatedSprite animate(final long[] pFrameDurations, final int pFirstTileIndex, final int pLastTileIndex, final int pLoopCount, final IAnimationListener pAnimationListener) {

        if(pLastTileIndex == pFirstTileIndex) {

                throw new IllegalArgumentException("An animation needs at least two tiles to animate between.");

        }

        final int frameCount = Math.abs(pLastTileIndex - pFirstTileIndex) + 1;

        if(pFrameDurations.length != frameCount) {

                throw new IllegalArgumentException("pFrameDurations must have the same length as pFirstTileIndex to pLastTileIndex.");

        }

        this.mFrameCount = frameCount;

        this.mAnimationDirection = (pLastTileIndex > pFirstTileIndex ? 1 : -1);

        this.mAnimationListener = pAnimationListener;

        ...

}

 

 

http://www.andengine.org/forums/development/animatedsprite-how-to-animate-in-reverse-t83.html

Tags:

Android, AndEngine, Animated Sprite, Reverse order animate

How to check is connected to network

public boolean isNetworkConnected(){

    if (isGranted(android.Manifest.permission.ACCESS_NETWORK_STATE, getContext())) {

            return false;

        }

        ConnectivityManager conMan = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = conMan.getActiveNetworkInfo();

        return activeNetwork != null && activeNetwork.isConnected();

}

public boolean isGranted(String permission, Context ctx) {

        return PackageManager.PERMISSION_DENIED == ctx.getPackageManager().checkPermission(

                permission, ctx.getPackageName());

    }

Simple code snippet to check that is device connected to network. There are also other helpful methods of NetworkInfo like isConnectedOrConnecting, isAvailable, isFailover, isRoaming etc