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Topics
   
Image Processing in Android : Part 1 : How to make mirror image of an image Android
This is the first installment in my series of image processing tutorials. Before we go further, lets have an overlook on what image processing is. What is Image Processing? Image processing is a method to convert an image into digital form and perform some operations on it, in order to get an enhanced image or to extract some useful information from it. It is a type of signal dispensation in which input is image, like video frame or photograph and output may be image or characteristics associated with that image. Usually Image Processing system includes treating images as two dimensional signals while applying already set signal processing methods to them. ...
Posted By: Mujahid khan Date: 17 Nov 2012 View: 1861
How to make Live Wallpaper in Android Android
One of the amazing features of Android powered devices is the ability to run Live Wallpapers. Alive wallpaper is not simply an animated image (unlike other OSs supporting gif images) but is much more than that. We, as a developer, can build a Live Wallpaper that are richer, animated, interactive backgrounds and are very similar to a normal Android application where you can show a map of current location, a sequence of animations, fetch some data from web and show to user etc. ...
Posted By: Mujahid khan Date: 22 Sep 2012 View: 1429
How to use camera in your Android app. Android
Prerequisite : Basic knowledge of programming in Android. Camera is one of the most common features available on phones today and is also most desired one. Being a developer for smartphone apps, we must know how to implement camera functionality in our own app and how we can play around with it. In this tutorial, we are going to learn how we can use camera in our own app with full control over the camera functionality unlike launching the default camera of device. It covers everything you need to know from defining your own surface to show camera preview, to capturing the images and getting hold of image data to do whatever operations you want to do on it. Here, we have just displayed the clicked image in the bottom of screen for simplicity. This tutorial is based on eclipse Indigo Service Release 1, Android sdk v-2.2 and JDK 1.6 ...
Posted By: Mujahid khan Date: 01 Sep 2012 View: 931
How to add multiple sliding views in an activity Android
In this tutorial we are going to learn how we can add multiple views in an activity that changes when user drags the view. Similar functionality can be achieved using ViewFlipper that holds multiple views as children and provides methods to switch between them at runtime, but this is good for simpler views but for more complicated views, this will be a bit messy as we have to manage all the code for views in a single activity. To avoid this and to maintain modularity, we can alternatively use ViewPager which is provided by android support package (as it is a part of api level >3). This can be seen as an AdapterView (like ListView, GridView etc) containing Fragments as items. In ViewPager, Screen moves as we move our finger which is a cool effect unlike swipe detection which suddenly changes the screen as soon as swipe is done and that too by implementing our own logic for swipe detection. This can be used in applications like image viewers, e books etc where switching between multiple views along with a move-with-finger effect is needed. I personally emphasize on using Fragments where multiple screens are to be maintained in an activity, as they are like sub activities and retain the concept of modules as you can have different classes for different Fragments maintaining different views. ...
Posted By: Mujahid khan Date: 25 Aug 2012 View: 1331
How to highlight a particular item in ListView in Android ! Android
In this article, we are going to learn how we can highlight a particular item in ListView in Android in an Easy way. When user clicks the item, it will be colored in a different way than other items(to show that it is highlighted), This highlighting is maintained even when user scrolls the list. Full source code is available for download. ...
Posted By: Mujahid khan Date: 13 Aug 2012 View: 1220
How to drag and drop a view in Android in very easy way ! Android
Drag and Drop is one of the very basic and much needed functionality especially for apps running on touch screens. In this article, we are going to learn how we can achieve this in Android in a way that is damn easy to understand and implement. There are many posts over the web but most of them are limited to a particular API level or are very complicated that makes them difficult for a novice to understand. Here we are going to implement drag/drop functionality that is easy to understand and can be implemented from Android 4.0 to way back to Android 1.6 ...
Posted By: Mujahid khan Date: 07 Aug 2012 View: 1756
Voice recognition in Android Android
OBJECTIVE S: To introduce voice recognition ability of Android powered devices to app developers. PREREQUISITES : 1. Basic knowledge of Android app development 2. Fully configured PC(windows) for Android development. 3. Any Android powered device as Voice recognition might not work on emulators. LEVEL OF DIFFICULTY : Mediocre ...
Posted By: Mujahid khan Date: 01 Aug 2012 View: 908
How to record audio in android programmatically Android
In this tutorial, we are going to see how we can record audio and save it to a file. This tutorial assumes that you have basic knowledge of Android app development. This tutorial uses eclipse, Android sdk 2.3.3 running on Windows based pc ...
Posted By: Mujahid khan Date: 20 Jul 2012 View: 3892
How to generate and parse data in JSON format in Android Android
JSON (JavaScript Object Notation) is a lightweight computer data interchange format. It is a text-based, human-readable format for representing simple data structures and associative arrays (called objects). ...
Posted By: Mujahid khan Date: 17 Jul 2012 View: 930
How to store user preferences in Android Android
While developing apps for mobile devices, we often come across situation where we want to store user preferences so that user experience gets more friendly and more customized. In this article we will learn how we can manage these preferences in Android. ...
Posted By: Mujahid khan Date: 11 Jul 2012 View: 872
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