By Marko Gargenta, Masumi Nakamura
Are looking to construct apps for Android units? This booklet is the appropriate technique to grasp the basics. Written via specialists who've taught this cellular platform to enormous quantities of builders in huge companies and startups alike, this light creation indicates skilled object-oriented programmers the best way to use Android's simple construction blocks to create consumer interfaces, shop info, hook up with the community, and more.
during the publication, you'll construct a Twitter-like software, including new good points with every one bankruptcy. You'll additionally create your individual toolbox of code styles that can assist you application any kind of Android software with ease.
familiarize yourself with the Android platform and the way it matches into the cellular ecosystem
Dive into the Android stack, together with its software framework and the APK software package
research Android's construction blocks: actions, Intents, companies, content material services, and Broadcast Receivers
Create simple Android person interfaces and manage UI parts in perspectives and Layouts
construct a carrier that makes use of a heritage strategy to replace information on your program
Read Online or Download Learning Android: Develop Mobile Apps Using Java and Eclipse (2nd Edition) PDF
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Extra info for Learning Android: Develop Mobile Apps Using Java and Eclipse (2nd Edition)
We will use them to represent property values. We will also briefly consider tuples as a way of making things as groups of fixed numbers of property values. 2 Expressions and types SML programs consist of function definitions and expressions that use the defined functions. We will see how expressions are formed as the book progresses. At its simplest, an expression may be a value from a basic type. Types and typing are central to SML, as we shall see. They enable thorough checks on whether operations and functions are put together correctly.
3) Given the following table of people: name Chris pat Jo Chris Pat Jo sex female male female male female male age 22 17 21 20 19 18 swims yes no yes yes no yes describe how to solve the following problems in terms of doing something to the first entry having done something to the rest of the entries, or doing something with no entries: THINGS, COLLECTIONS AND PROPERTIES a) count how many female people swim b) find the ages of all the male people who don’t swim c) find the names and sexes of all the people whose ages are at least 20 d) find the total age of all the people e) find the total age of all the people called Jo f) find the total age of all the female people who swim g) count how many people are called Pat and are less than 20 h) count how many people are called Pat or called Jo i) check if everyone swims j) check if everyone swims or is called Jo k) check if everyone who is male also swims l) check if everyone who is female is also over 19 In each case, check your description by working through it by hand.
15 Tuple type operators div and mod are really special SML notation for operators which apply to tuples of two integers. The function op is used to convert such special operators into functions on tuples. For example: – (op div) (126, 3); > 42 : int is the same as: – 126 div 3; > 42 : int Similarly: – (op mod) (97, 55); > 42 : int is the same as: – 97 mod 55; > 42 : int Thus, we can use op to convert such operators into functions and thence display their types. For example: – op div; > fn : int*int -> int and: – op mod; > fn : int*int -> int shows that op div and op mod are functions from int * int domains to int ranges.