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By Joshua Marinacci
Do you need to enhance cellular apps with Java—and have them paintings on numerous units powered through iOS and Android? You’ve come to the perfect place.
This project-driven ebook indicates you the way to construct transportable apps with remarkable open resource frameworks, Google internet instruments (GWT) and PhoneGap. With those instruments, you’ll use the way to write Java code that compiles into cross-platform Javascript and HTML, and realize the best way to make the most of positive factors in different well known units, equivalent to the digital camera, accelerometer, and GPS.
- start with GWT via development an instance Twitter seek app
- construct a instance internet app and adapt it for cellular with CSS
- upload contact centric controls with the GWT cellular UI library
- boost a operating wine magazine app that tracks a user’s GPS location
- Use strategies to make a cellular model of your internet or computing device app
- paintings with HTML5 Canvas to construct a cellular video game
- package deal your apps for iOS, webOS, and Android with PhoneGap
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starting Android four is an replace to starting Android three, initially written by way of Mark Murphy. it's your first step at the route to growing marketable apps for the burgeoning Android industry, Amazon's Android Appstore, and extra. Google’s Android operating-system has taken the by means of typhoon, going from its humble beginnings as a cellphone working method to its present prestige as a platform for apps that run throughout a gamut of units from telephones to pills to netbooks to televisions, and the checklist is bound to develop.
shrewdpermanent builders aren't sitting idly by means of within the stands, yet are leaping into the sport of constructing leading edge and salable functions for this fast-growing, cellular- and consumer-device platform. If you’re now not within the online game but, now's your probability!
starting Android four is clean with info at the most recent generation of the Android platform. start at the start via fitting the instruments and compiling a skeleton app. go through developing layouts, making use of widgets, taking consumer enter, and giving again effects. quickly you’ll be growing leading edge purposes regarding multi-touch, multi-tasking, location-based characteristic units utilizing GPS.
You’ll be drawing information reside from the web utilizing net prone and delighting your shoppers with life-enhancing apps. now not because the computing device period first all started has there been this a lot chance for the typical developer. What are you anticipating? seize your reproduction of starting Android four and start!
<h3>What you’ll learn</h3> * enhance Java-based cellular functions and video games for a variety of telephones and units.
* Create consumer interfaces utilizing WebKit and the Android widget framework.
* construct place- and map-based functions drawing on stay feeds over the net.
* contain actions, providers, content material companies, and broadcast receivers into your purposes.
* aid a number of Android types, a number of display sizes, and different device-specific features.
* construct and event the array of recent WebM video and different multimedia APIs for Android and extra.
Who this booklet is for
starting Android four is aimed toward programmers new to Android software improvement who wish to create marketable functions for the burgeoning industry of telephone, pill, and different Android machine clients.
desk of Contents * the large photograph
* how you can start
* Your First Android venture
* analyzing Your First undertaking
* a section approximately Eclipse
* improving Your First undertaking
* Rewriting Your First undertaking
* utilizing XML-Based Layouts
* making use of easy Widgets
* operating with packing containers
* The enter procedure Framework
* utilizing choice Widgets
* Getting Fancy with Lists
* nonetheless extra Widgets and packing containers
* Embedding the WebKit Browser
* utilising Menus
* displaying Pop-up Messages
* dealing with job Lifecycle occasions
* dealing with Rotation
* facing Threads
* growing cause Filters
* Launching actions and Sub-Activities
* operating with assets
* Defining and utilizing types
* dealing with a number of monitor Sizes
* Introducing the Honeycomb UI
* utilizing the motion Bar
* Fragments
* dealing with Platform adjustments
* gaining access to documents
* utilizing personal tastes
* handling and gaining access to neighborhood Databases
* Leveraging Java Libraries
* speaking through the net
* providers: the speculation
* simple provider styles
* Alerting clients through Notifications
* asking for and Requiring Permissions
* getting access to Location-Based companies
* Mapping with MapView and MapActivity
* dealing with cell Calls
* Fonts
* extra improvement instruments
* The function of other Environments
* HTML5
* PhoneGap
* different replacement Environments
* facing units
* the place can we pass from right here?
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Additional info for Building Mobile Applications with Java: Using the Google Web Toolkit and PhoneGap
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The wine object has several fields on it. name field as the value. variety. Saving the Wine Data | 43 Now suppose we want to store two wines? Storing both wine names with the key name wouldn’t work because the second wine would overwrite the first one. We need the two keys to be unique, and also associated with the actual wine object. We can do this by giving each wine an ID and using that ID as part of the key. variety); I added an id field to the Wine class. If the id is currently unset (null) then it generates a new random id.
That’s one less thing the user has to type in. Navigation can live by this principle as well. If the user is in the add wine screen when they quit the app then the app should return to the add screen when launched again rather than jumping back to the main screen. Keep the app in the state the user last left it in. Use device features When asking the user for information, much of it could actually be gathered by querying the device instead of the user. Photo apps use the device orientation to tell if the image is a landscape or portrait photo rather than actually asking the user which way it is.
Add the jar to your project as before. PhoneGap' /> Getting the User’s Location | 45 Now you can call the PhoneGap APIs directly from Java code. First, you need to initialize Phone Gap. This sets up a bunch of internal API mappings and can take a significant amount of time depending on the platform. To deal with this Phone Gap provides a callback for when it is done being initialized. That’s when we can safely start the rest of our app. initializePhoneGap(); Now that PhoneGap is initialized we can call the Location API.