This article will explain how to create fragments inside an Activity, how to dynamically add a fragment to an Activity, how to create transition animations between fragments, how to hide the previous fragment and finally how to use the fragment backstack. Continue reading →
This article describes how to create a reusable class that can upload images from our Gallery or take a picture, put them on a canvas and move them around the screen, resize them, erase them and convert them to black and white. This tutorial uses a class that extends View and uses onTouchEvents. This is class also takes care of the VM Budget issue of loading images from the gallery by optimizing the memory each image uses. It uses android 2.2 and above.
This article describes how to create/access a MYSQL database in a remote server from Android using PHP and display it on a ListView. Because most online tutorials did not show the full process or all source code, I decided how to create a fully functional prototype. Currently you can see my JSON objects by going to this link: http://www.ece301.com/food.php which accesses my database and extracts the information. This article uses Cpanel, php and Android API 2.1. Continue reading →
This article describes how to create an XML Parser for Android. The files are located in the SD card and use a SAX parser. Why use XML? If you are designing an application that has static data, it might be simpler to keep information in a flat file instead of creating a database and query for values. Continue reading →
This article describes how to create a project using an SQLite database. Most online tutorials show how to input one value. Here I will create a database of users with three values: first name, last name and age. This is then displayed in a ListView. This article includes adding and deleting users, using a Cursor, dynamically loading data to a ListView and using an AlertDialog to input user information. Continue reading →
This article describes how to create a secure socket from an android device to a server using a certificate. It explains how to create a key that Android can use, write a secure server socket, a client socket and send information back and forth between them.
This article describes how to draw a bounding box on top of a camera preview to capture part of the image just like Google goggles does. This article mainly involves looking at a SurfaceView for generating a camera view and a View to create a canvas and draw on top of the camera view. Also shows how to use the onTouchInterceptEvent to pass touch events to lower Views. Android 2.2 API needs to be used for this. Continue reading →
This article describes how to create an HTTP connection from an android device to a web server, grab JSON data, parse and display it on a ListView. The ListView is custom thus allowing me to add other Views along the ListView. This was written using Android 2.1 APIs.
This article describes a simple way to take pictures using Android’s built in classes and save them to the SD card. It also shows how to display the picture on the screen. All of this in less than 40 lines of code. This was written using Android 2.1 APIs. Continue reading →