Deployment descriptor of the sample application. The primary activity of the application The sample application consists of a single activity, namely SaySomething.
This article was written in and remains one of our most popular posts. Writing your first app and seeing it running on your phone is only half the fun when it comes to Android. Head over to http: Setting Up Your Development Environment Java developers, especially those using Eclipse, will have an easy transition to the Android development world.
Android development is supported on the three major operating systems: You can download the specific JDK for your system from http: Android SDK Tools available from http: Take note where this is installed or unzipped for the next step.
Select Developer Tools and click Next, and Next again when presented with the items to be installed. Read and accept the license terms, and click Finish. When the installation is complete, restart Eclipse.
Now configure the installed plugin by clicking on the Window menu and selecting Preferences. Click Apply, then OK. Using the tools now installed, you need to install the SDK components. Launch the manager and select Available packages. Running the Emulator Now that you have all the tools required to started developing and running Android apps, you need to create a virtual device for your apps to run on in the Android Emulator.
You can also create multiple AVDs to test against, which comes in handy when you want to test your app on different-sized screens and various versions of the SDK. Give the device a name and select the target SDK from the drop-down.
Creating a Project Leaving the Emulator running, restart Eclipse so as to create our first Android project. Fill in the Project and Application names, and then enter a package name for the app.
This package will not only become the top-level Java package for your source files, but also provides a unique identifier for your app. No two apps can have the same package identifier installed on the phone at the same time, and the same goes for apps submitted to the Android Market.
With Create Activity selected, provide a name for the Java class that will become the entry point to your app, and click Finish. Explore the contents of the generated project. You will find various Java, XML, and configuration files.
This is a good time to explain three key concepts used in Android app development. The Activity will display a user interface in the supplied Window, and interact with the user to perform the task.
A single Activity could be displaying a list of emails or showing a map of the current location.
Typically, multiple Activities together form a complete Android application. The generated Activity extends from the class android.In Android, there are several ways to store persistent data. SQLite is one way of storing app data. It is very lightweight database that comes with Android OS.
In Android, integrating SQLite is a tedious task as it needs writing lot of boilerplate code to store simple data. Java Web Application is used to create dynamic websites. Java provides support for web application through Servlets and yunusemremert.com can create a website with static HTML pages but when we want information to be dynamic, we need web application.
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