How to empty an NSMutableArray ?

Hi, Sometimes you may need to empty an NSMutableArray which is already initialized with some objects. You don’t need to release it and again alloc it for future use! You can simply empty an NSMutableArray using the following line of code. [yourArray removeAllObjects]; Here ‘yourArray’ is your NSMutableArray.

Make your own gesture application in ANDROID or How to use gestures in ANDROID?

Hi all…. In this tutorial I will teach you how to make use of Gestures in ANDROID and make your own application. Follow the below steps exactly to get an idea of how to use gestures. 1. Make a gesture Library. 2. Add your own gestures into it. 3. Export it to your applications and… Read More »

How to get information about all the applications installed in your ANDROID Emulator or Phone? / How to use getPackageManager() in ANDROID ?

Hi all, In this tutorial I will show you how to get the information about all the applications installed in your ANDROID phone. What you have to do is create a ANDROID project inside the package pack.GetAllInstalledApplications amd name the java file “GetAllInstalledApplicationsExample.java” and copy the following code into it. Here the “getPackageManager().getInstalledPackages(0);” gets information… Read More »

How to make Sprite Sheets ?

Hi, If you are a game developer then you will always need a sequence of images to be animated & the best way to do it is via sprite sheet animations. But how can a sprite sheet be made? Suppose you have a sequence of images of any animations, how will you convert it into… Read More »

How to sign Android project apk

This is a very tricky part and initially i was also ran in to strange problems . Before uploading to android market you must do the following steps. Create a Certificate Signing your application apk Finally Zip align the signed apk First the application you created should be converted to apk format. For this if… Read More »

“Conversion to Dalvik format failed with error 1” Error in ANDROID / Eclipse.

This is a normal error when you import some project into eclipse. I will show you how to solve this First try cleaning the project from project->Clean. If this didn’t work, then try these Follow these steps 1. Go to Project » Properties » Java Build Path » Libraries and remove all except the “Android… Read More »

"Conversion to Dalvik format failed with error 1" Error in ANDROID / Eclipse.

This is a normal error when you import some project into eclipse. I will show you how to solve this First try cleaning the project from project->Clean. If this didn’t work, then try these Follow these steps 1. Go to Project » Properties » Java Build Path » Libraries and remove all except the “Android… Read More »

Cocos2D Sprite Sheet Animation

Hi, Suppose you have a sprite sheet of the desired animation you want. But how will you use that sprite sheet animation in your program using cocos2D? That’s simple. See the following code first. Note : But how to make a sprite sheet? That topic can be found here. Making of sprite sheets from individual… Read More »

Email id verification using Objective C

Hi, In order to verify an email address you have entered is valid or not using Objective C, use the following code. – (BOOL) checkYourMail: (NSString *) myEmail{ NSString *checkMail= @”[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}”; NSPredicate *matchMail = [NSPredicate predicateWithFormat:@”Matching %@”, checkMail]; return [matchMail evaluateWithObject:myEmail]; }

Using Gestures in ANDROID,A Simple example.

This is a really simple example illustrating gestures in ANDROID. You Know that everything you do with your hand inside the phone is a gesture like SingleTap, doubleTap etc. Here is a quick illustration of this. For this the activity must implement OnGestureListener. The GestureDetector detects the gestures. Let’s look at the example. The layout… Read More »

How to open browser in an ANDROID application? How to open a URL from an ANDROID application?

Hi all,In this tutorial I will show you how to open browser from an ANDROID application. This is done through intents. You know that intents are used to invoke other activities. So we here invoke the browser activity. The following code will open the default browser in your ANDROID phone. This is the manifest file… Read More »

How to change the Z value of a Sprite during an action in Cocos2D ?

Hi, There may arise some situations where you need to change the z value of a particular sprite during an action in Cocos2D. So how can you do that? See the following lines of code. CCSprite *sample= [CCSprite spriteWithFile:@”trialImage.png”]; sample.position = ccp(160,240); [self addChild:sample z:1]; /* Some of your actions goes here! */ [self reorderChild:sample… Read More »

Creating a Button using Objective C

Hi, Sometimes you may need to create some buttons to the View using Objective C code rather than using Interface Builder. Here is how you can do that easily and efficiently. //You can create button with type. Here I am creating a Custom Button UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom]; //Then what? Give action to be… Read More »