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google android services

                     Google Services

Google offers a variety of services that help you build new revenue streams, enhance your app's capabilities, manage distribution and payloads, and track usage and installs. Many of the services use static libraries that you download through the Android SDK Manager and build into your app. Others are configurable directly from Google Play Android Developer Console.

android apps connectivity

                         Connectivity

Android provides rich APIs to let your app connect and interact with other devices over Bluetooth, NFC, Wi-Fi Direct, USB, and SIP, in addition to standard network connections.The Android platform includes support for the Bluetooth network stack, which allows a device to wirelessly exchange data with other Bluetooth devices. The application framework provides access to the Bluetooth functionality through the Android Bluetooth APIs. These APIs let applications wirelessly connect to other Bluetooth devices, enabling point-to-point and multipoint wireless features.

android apps location and sensors

               

              Location and Sensors

Use sensors on the device to add rich location and motion capabilities to your app, from GPS or network location to accelerometer, gyroscope, temperature, barometer, and more.Location and maps-based applications are compelling for mobile device users. You can build these capabilities into your applications using the classes of the android.location package and the Google Maps external library.Android gives your applications access to the location services supported by the device through the classes in theandroid.location package. The central component of the location framework is the LocationManager system service, which provides APIs to determine location and bearing of the underlying device (if available).

android apps media and camera

                 

               Media and Camera

Add video, audio, and photo capabilities to your app with Android's robust APIs for playing and recording media.The Android multimedia framework includes support for playing variety of common media types, so that you can easily integrate audio, video and images into your applications. You can play audio or video from media files stored in your application's resources (raw resources), from standalone files in the filesystem, or from a data stream arriving over a network connection, all using MediaPlayerAPIs.

android apps animatin and graphics

              Animation and Graphics                  

Make your apps look and perform their best using Android's powerful graphics features such as OpenGL, hardware acceleration, and built-in UI animations.Android provides a variety of powerful APIs for applying animation to UI elements and drawing custom 2D and 3D graphics. The sections below provide an overview of the APIs and system capabilities available and help you decide with approach is best for your needs.The Android framework provides two animation systems: property animation (introduced in Android 3.0) and view animation. Both animation systems are viable options, but the property animation system, in general, is the preferred method to use, because it is more flexible and offers more features. In addition to these two systems, you can utilize Drawable animation, which allows you to load drawable resources and display them one frame after another.

android apps resources

             

                        App Resources

It takes more than just code to build a great app. Resources are the additional files and static content that your code uses, such as bitmaps, layout definitions, user interface strings, animation instructions, and more.You should always externalize resources such as images and strings from your application code, so that you can maintain them independently. Externalizing your resources also allows you to provide alternative resources that support specific device configurations such as different languages or screen sizes, which becomes increasingly important as more Android-powered devices become available with different configurations. In order to provide compatibility with different configurations, you must organize resources in your project's res/ directory, using various sub-directories that group resources by type and configuration.

android apps user interface

                   

                        User Interface

Your app's user interface is everything that the user can see and interact with. Android provides a variety of pre-build UI components such as structured layout objects and UI controls that allow you to build the graphical user interface for your app. Android also provides other UI modules for special interfaces such as dialogs, notifications, and menus.

The user interface for each component of your app is defined using a hierarchy of View and ViewGroup objects, Each view group is an invisible container that organizes child views, while the child views may be input controls or other widgets that draw some part of the UI. This hierarchy tree can be as simple or complex as you need it to be (but simplicity is best for performance).

android app components

                                   

                               App Components

Android's application framework lets you create extremely rich and innovative apps using a set of reusable components. This section explains how Android apps work and how you use components to build them.Android applications are written in the Java programming language. The Android SDK tools compile the code—along with any data and resource files—into an Android package, an archive file with an .apk suffix. All the code in a single .apk file is considered to be one application and is the file that Android-powered devices use to install the application.

for more reference please visit to http://developer.android.com/guide/components/index.html 

this will show you complete way to create android apps.