Using JSON for mobile object exchange – Tutorial

I’ve been working with various object encoding schemes to get information transferred over the network between services and mobile apps running on Android and BlackBerry. On Android, I figured I would try using Java object serialization, and that works some of the time, and not for anything complex. I wish the object serialization and deserialization mechanism in GWT would be ported over to all these mobile environments, but I digress. This tutorial outlines the use of JSON for this purpose.

Android Animation Framework Tutorial

This tutorial is an introduction to the built in animation frameworks that are part of the Android UI library. Without writing any animation/drawing code, you can do 2 types of animations – layout transitions that affect ViewGroups, and sequences inside a View. You can also do frame by frame animation, but this tutorial will not cover that. The basics covered here affect layout transitions, and animation of a View itself, using tweening animation, which includes each of the following effects (or any combination) – Alpha, Rotate, Scale, and Translate.

Android ListView and custom adapter Tutorial

This tutorial will show you how to use ListView to display selectable lists of non trivial data, using complex cell renderers. The ListView is a selectable list. You can attach a variety of data models to it and load different display layouts (cell renderers). You can create your own model and cell renderer. This model-view combo is called an Adapter. In this tutorial, I will show you how to extend create your own Adapter from scratch, and create your own cell renderers from scratch as well.

Android LinearLayout Tutorial

This tutorial shows you how to use the LinearLayout container (using Java code, not XML markup), which is the simplest layout mechanism available on Android. If you’re familiar with Swing’s BoxLayout then you will have a good idea of what this container has to offer. Linear layouts are really simple… you can add components horizontally or vertically to a ‘bag’ or ‘box’.

Android TableLayout Tutorial

This tutorial will show you how to use the TableLayout container, which is like an HTML table. The UI layout code is done in Java, not XML. A class (LayoutUtils) is provided to make it easier to attach layout params to View objects.

Android Activity and sub-Activity Tutorial

This tutorial will show you how to create a sub-Activity from a calling-Activity, and process the results produced by the sub-Activity, if you want to do so. Also, the various ways of launching a sub-Activity are covered, along with the Android Activity history stack. A subclass of Activity is also provided that makes it trivial to launch sub-Activities and respond to results from them.