Android Application Development All-in-One For Dummies by Barry Burd

By Barry Burd

A must-have pedagogical source from a professional Java educator
As a Linux-based working process designed for cellular units, the Android OS permits courses to run on all Android units and seem loose within the Android industry. no matter if you're a newbie programmer desirous to create cellular functions or you're Android-savvy and searching to post your apps to the Android industry, this compilation of 8 minibooks takes you thru the fine details of programming for Android telephones. Java professional Barry Burd walks you thru Android programming fundamentals, stocks concepts for constructing nice Android functions, stories Android undefined, and lots more and plenty more.* makes use of the straightforward-but-fun For Dummies sort to stroll you thru the fine details of programming for Android cellular units* gains 8 minibooks that take you from beginner Android person to expectantly constructing Android purposes* Addresses Android programming fundamentals, the working procedure, undefined, and defense* information what it takes to enhance striking Android apps* Covers the Eclipse atmosphere and SQLite
Start constructing purposes for the Android OS this day with the specialist recommendation in Android software improvement All-in-One For Dummies.

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Chapter 4 Math with Lua Love it or hate it, if you have decided to be a developer, you will have to come face to face with math. It is indeed surprising to see how many students dislike or shy away from math, but it just comes back to us in some form or the other, irrespective of our profession. An accountant needs to look at the accounts and add them up (requiring math), a surveyor needs to apply trigonometric principles to get elevation and terrain information, a banker needs to calculate interest and yield for investments, and so on.

Another important concept that we touched upon is the namespace. Namespaces help to distinguish between the functions available in the main namespace (the global functions) and the functions in a custom library. Chapter 3 File Operations When creating an app or a game, you need file I/O (input/output). You may not be working with a database, but there will always be the need to save something back to the disk; it could be the levels, the high score, a character the player might have unlocked, or some information regarding in-app purchases.

So, let’s write out lives variable to the storage so that it persists. open(filename,"w") if hfile==nil then return end -- Did not get a handle on the file hfile:write(value) hfile:close() end In the preceding code, we declare a function called writeToFileSingle that takes two parameters: value and filename. The function opens a file, writes the data to the file, and then closes the file. CHAPTER 3: File Operations 35 If we open a file, we are responsible for closing it too. open function, it returns the file handle and a string that contains the reason for the failure (if it fails to open the file).

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