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  • 1. What is Android ? • Android is a software stack that consists of key applications , hardware and software. • Android was developed by OHA(open handset Alliance) • Android was first deployed in the htc G1 (dream ) • Android is developed with the help of Java.
  • 2. What is Open Handset Alliance?
  • 3. • Open handset Alliance is a collaboration of companies that developed the android.
  • 4. • Linux kernel This provides basic system functionality like process management, memory management, device management like camera, keypad, display etc. • Libraries On top of Linux kernel there is a set of libraries including open-source Web browser engine WebKit, well known library libc, SQLite database which is a useful repository for storage and sharing of application data, libraries to play and record audio and video, SSL libraries responsible for Internet security etc.
  • 5. • Android Runtime • The Dalvik VM makes use of Linux core features like memory management and multi-threading, which is intrinsic in the Java language. • The Dalvik VM enables every Android application to run in its own process, with its own instance of the Dalvik virtual machine. • The Android runtime also provides a set of core libraries which enable Android application developers to write Android applications using standard Java programming language.
  • 6. • Application Framework • The Application Framework layer provides many higher-level services to applications in the form of Java classes. Application developers are allowed to make use of these services in their applications. • Applications • You will find all the Android application at the top layer. You will write your application to be installed on this layer only. Examples of such applications are Contacts Books, Browser, Games etc.
  • 7. Android Emulator
  • 8. Android Emulator • It is a tool on which android applications will be deployed and tested.
  • 9. Android Versions