Java talks. Android intoduction for develompment
- 1. introduction for development 2016 Aleksei Miliutin
- 2. - Android as OS - Android vs Java - General concepts in development - Interestingness - Features Agenda
- 3. File-oriented system Android as OS What does it mean? It doesn't matter where the file is, in all programms which support it, we see it. *.doc for office *.fb2 for readers
- 4. Work with memory Android as OS Android knows when it needs more memory and can close your application. We need to save important info.
- 5. Android is not framework Android vs Java The Android SDK provides the tools and APIs necessary to begin developing applications on the Android platform using the Java programming language.
- 6. Many APIs are similars Android vs Java but you don't have all J2SE APIs. Android uses its own library built on a subset of the Apache Harmony Java implementation. You can use java jars if they use only compatible APIs.
- 7. Android doesn’t use JVM Android vs Java it has has special VM Dalvik*. Code compiles to standart java byte-code and next it converts, with utility dx, to .dex formart to next interpritation on VM Dalvik. *Dalvik - fishers island in Iceland
- 8. General concepts in development Gradle Gradle is an open source build automation system that builds upon the concepts of Apache Ant and Apache Maven and introduces a Groovy-based domain-specific language (DSL) instead of the XML form used by Apache Maven of declaring the project configuration.
- 9. General concepts in development Activity An Activity is an application component that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a map. Each activity is given a window in which to draw its user interface.
- 10. General concepts in development Activity An Activity is an application component that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a map. Each activity is given a window in which to draw its user interface.
- 11. General concepts in development Layout A layout defines the visual structure for a user interface, such as the UI for an activity or app widget. You can declare a layout in two ways: Declare UI elements in XML. Instantiate layout elements at runtime.
- 12. General concepts in development Layout
- 13. General concepts in development Layout
- 14. General concepts in development Layout
- 15. General concepts in development Service. Broadcast receiver A service is a component that runs in the background to perform long-running operations without needing to interact with the user and it works even if application is destroyed. Broadcast Receivers simply respond to broadcast messages from other applications or from the system itself. These messages are sometime called events or intents.
- 16. General concepts in development Android manifest Every application must have an AndroidManifest.xml file (with precisely that name) in its root directory. The manifest file presents essential information about your app to the Android system, information the system must have before it can run any of the app's code.
- 17. General concepts in development Android manifest
- 18. Features Lifecycles Many components in Android have its own lifecycle. Android system calls a series of lifecycle methods on the component which running now in the user interface or other components in background. Activity lifecycle
- 19. 1 dp = 0.75 px 1 dp = 1 px 1 dp = 1.5 px 1 dp = 2 px 1 dp = 3 px Features dp instead of px Density-independent pixels (pronounced “dips”) are flexible units that scale to uniform dimensions on any screen. When developing an Android application, use dp to display elements uniformly on screens with different densities. low (ldpi) medium (mdpi) high (hdpi) extra high (xhdpi) extra-extra-high (xxhdpi)
- 20. Features Simple localization Put the application's default text in a file with the following location and name:res/values/strings.xml (required directory) You want to localize all the text in your application to Ukranian. In this case, you could create second alternative strings.xml files, each stored in a locale-specific resource directory:res/values-uk/strings.xml If the device is set to any language other than Ukranian, Android will load title from the res/values/strings.xml file. If the device is set to Ukranian, Android will load title from the res/values- uk/strings.xml file.
- 21. Interestingness Firebase Firebase's is a NoSQL database which provides an API that allows developers to store and sync data in realtime to every connected client. Database is storing in JSON. When data changes, the Firebase automatically sycn it with connected clients. Before data has been writen to server it saves in local, what gives possibility to working offline.
- 25. THANKS FOR ATTENTION Aleksei Miliutin Contact info: skype: leshkou email: leshkou@gmail.com