پاورپوینت کامل Programming the Android 27 اسلاید در PowerPoint

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پاورپوینت کامل Programming the Android 27 اسلاید در PowerPoint

اسلاید ۴: Section IIntroduction, Mobile Programming, Android overview

اسلاید ۵: Why is mobile programming differentSo why can’t we just put our desktop code on a mobile device verbatimEasy answer: mobile devices have different types of resources (RAM, long term storage, etc…) than your laptop.Slightly more difficult answer:The field is moving quickly, driven by industry, companies are driven by time to market.Consequence: APIs are specific to devices.Mobile devices have increased RAM daily, so why don’t we wait until we have enoughEasy answer, we never willHarder answer:Other differences too.Device manufacturers or other big companies give you the tool chain.The API is restricted:Don’t want a program to send data or text without your knowledge!User interaction is different on a mobile device (small screen)

اسلاید ۶: Practical Matters…You’ll write your code in Java, and using the android API.It might not do everything you want!I had to write my own class to output DOM based XML.Also, it changes, your app might require the newer APIs.The SDK, emulator, etc… Is all free!Uses Eclipse for the IDE, you might be able to get VS to workA few basic classes, then lots of smaller utility classes:Some classes are Android specificI strongly encourage you to do the following:Go through the slides in this talk first, and then the sample application.Go to the Android developer documentation, and read through the main pages / classes.Start working on your own applications, and then when you get stuck, read the documentation

اسلاید ۷: Installing the SDKhttp://developer./sdk/installing.htmlDescribes in lengthy detail how to do this, but I’ll give a quick overview.First download Eclipse:http:// download the Android SDK:http://developer./sdk/index.htmlUnzip the SDK and run the SDK manager in the directory you unzip, then install all of the extra required packages, etc…Be sure to poke around in the SDK directory, there are lots of samples, documentation, and more!Create a new virtual device so that you can run an emulator.Then go into eclipse and download the Android developer tools:Go to Help->Install new software… and add the following URLhttps://dl-ssl/android/eclipse/Now add a new name (just make one up) and downloadYou should be good to go from here! Try doing a New->Project and selecting a sample application!

اسلاید ۸: Section IIBasic Android programming overview

اسلاید ۹: The Android ApproachBased on the Model View Controller design pattern.Don’t think of your program as a linear execution model:Think of your program as existing in logical blocks, each of which performs some actions.The blocks communicate back and forth via message passing, etc…Added advantage, physical user interaction (screen clicks) and inter process interaction can have the same programming interfaceAlso the scheduler can bring different pieces of the app to life depending on memory needs and program useFor each distinct logical piece of program behavior you’ll write a Java class (derived from a base class).Activities: Things the user can see on the screen. Basically, each different screen in your program.Services: Code that isn’t associated with a screen (background, fairly common)Content providers: Provides an interface to exchange data between programs (usually SQL based)Kind of vague, but we’ll given an example.

اسلاید ۱۰: ActivitiesActivities describe individual screens with which a user could be interacting.Your program specifies a top level screen that runs upon application startup.Each Activity performs its own actions, to execute a method in another Activity use an Intent.The Activity base class already provides you with enough functionality to have a screen which “does nothing”Provides you with an empty canvas!No pun intended…The activity allows you to set the top level GUI container.Then you instantiate some Views (widgets), put them in a container View, and set the container as the Activity’s top level View:This is what gets displayed on the screen when the Activity is running.We won’t go too in depth on GUI programming here, lo