Pro Java ME Apps by Ovidiu Iliescu (auth.)

By Ovidiu Iliescu (auth.)

Pro Java ME Apps delivers, the developer, the information required for writing refined Java ME functions and for making the most of this large power industry. Java ME is the most important cellular software program platform on the planet, supported by way of over eighty% of all telephones. you are going to disguise what Java ME is and the way it compares to different cellular software program systems, tips to appropriately layout and constitution Java ME purposes, tips on how to imagine like an skilled Java ME developer, what universal difficulties and pitfalls you could run into, how one can optimize your code, and plenty of different key issues.

in contrast to different Java ME books available in the market, which in simple terms train the reader the fundamentals of Java ME in terms of a couple of uncomplicated examples, this booklet offers a broader, eagle-eye photo of a whole Java ME program and what writing one contains. From there, the publication provides, explains, and enables you to enforce all of the crucial facets of Java ME improvement, from the consumer interface to client-server conversation. As this unfolds, the choices and reasoning at the back of the code also are presented.

The e-book assumes that the reader is already conversant in Java ME and Java purposes in general.

  • Based on and geared in the direction of real-life Java ME eventualities
  • Guides the reader during the complete means of constructing a solid Java ME program
  • Explains the choices made at every one step, offers recommendation and examples of excellent practices vs. undesirable practices

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CHAPTER 1: Getting Started Finally, decentralization also means that components should be able to “think for themselves,” so to speak. For example, in the GUI layer, rather than having a central entity decide where each widget should be placed and how big it should be, you can have the widgets format themselves. All the “central authority” has to do is provide information, such as how much space is available in the current row. This approach can be used on all software platforms, but it’s even more important for Java ME because of all the different (and small) screen sizes, UI layouts, and interaction paradigms it has to support.

Listing 1–3. Changing the Direction a Game Entity Is Facing public void entityMoved(int x, int y) { ... setFacingAngle(angle); ... } public int getAngleForTile(int x, int y) { // some complex calculations involving sine and cosine here } The main problem with this code is that the CPU-heavy getAngleForTile() method will always calculate the angle for any given (x,y) pair passed as an argument. Usually this is not a concern, but when CPU resources are low, the time spent in this method might add up to something substantial.

Listing 1–3. Changing the Direction a Game Entity Is Facing public void entityMoved(int x, int y) { ... setFacingAngle(angle); ... } public int getAngleForTile(int x, int y) { // some complex calculations involving sine and cosine here } The main problem with this code is that the CPU-heavy getAngleForTile() method will always calculate the angle for any given (x,y) pair passed as an argument. Usually this is not a concern, but when CPU resources are low, the time spent in this method might add up to something substantial.

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