Code crunch
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This document provides an overview of Android development. It discusses that Android is an open source software stack that includes an operating system, middleware and key applications. It also describes the Android software development kit which contains libraries and tools for building Android apps. The document then covers how to set up an Android development environment using Eclipse and the Android SDK, and demonstrates how to use the Android emulator to test apps. It also provides an overview of activities, intents and the activity lifecycle which are fundamental concepts in Android development.
Code crunch
- 1. CODE CRUNCH QUICKSTART TO ANDROID DEVELOPMENT By: Obed Ademang – GDG, UCC Lead
- 2. NO ANDROID DEVICE I LIKE APPS Nene Padi Ademang (Obed) NOT A DEVELOPER NO KNOWLEDGE OF PROGRAMMING 2/18/2014 2
- 3. Overview of the Platform Nene Padi Ademang (Obed) 2/18/2014 3
- 4. Android Platform It is a software stack for mobile devices. It contains: OS Kernel, system libraries, application frameworks and key apps Android Software Development Kit (SDK): Libraries and development tools for creating android applications There are lots of documentation on: http://developer.android.com/training Nene Padi Ademang (Obed) 2/18/2014 4
- 5. Applications Application Framework Libraries Android Runtime Linux Kernel Nene Padi Ademang (Obed) 2/18/2014 5
- 6. Development Nene Padi Ademang (Obed) 2/18/2014 6
- 7. Android Development Environment ADT Bundle Eclipse + ADT Plugin Latest system image for emulator Latest Android platform Additional development tools Prerequisite Windows 7 / Mac OS X (Intel x86) / Various Linux Distros At least Java SE 6 Knowledge about Java Programming Nene Padi Ademang (Obed) 2/18/2014 7
- 8. Demo Nene Padi Ademang (Obed) 2/18/2014 8
- 9. Pros & Cons of the Emulator Pros Nene Padi Ademang (Obed) Cons 2/18/2014 9
- 10. Advance Features of Emulator The emulator helps test some advance features like Network speed/Latency Battery power Location coordinates Emulated calls Nene Padi Ademang (Obed) 2/18/2014 10
- 11. Demo Nene Padi Ademang (Obed) 2/18/2014 11
- 12. Overview of Activity Life Cycle and Intents Nene Padi Ademang (Obed) 2/18/2014 12
- 13. Activity An application component that provides a screen with which users can interact in order to do something. An application usually consists of multiple activities that are loosely bound to each other. Each time a new activity starts, the previous activity is stopped, but the system preserves the activity in a stack (the "back stack"). startActivity() startActivityForResult() Nene Padi Ademang (Obed) 2/18/2014 13
- 14. Nene Padi Ademang (Obed) 2/18/2014 14
- 15. Intents Explicit intent Intent intent = new Intent(this, SignInActivity.class); startActivity(intent); Implicit Intent Intent intent = new Intent(Intent.ACTION_SEND); intent.putExtra(Intent.EXTRA_EMAIL, recipientArray); startActivity(intent); Nene Padi Ademang (Obed) 2/18/2014 15
- 16. Demo Nene Padi Ademang (Obed) 2/18/2014 16
- 17. Nene Padi Ademang (Obed) 2/18/2014 17
Editor's Notes
- #5: 1. Primarily for mobile devices but not exclusively
- #6: 1. Linux Kernel: a. Provides core services such as security, memory process m’gt, File and network I/O, Device drivers b. Android specific services like power m’gt, low memory killer, shared memory etc2. Libraries: a. Written in C/C++, for purposes of performance sensitive and computations b. System C libraries, for bionic libc c. Surface m’ger for display d. Media framework, controls audio and video e. Webkit for browser engine f. Open GL for graphics 3. Runtime: a. Core Java libraries which can be reused to develop apps b. Dalvik Virtual Machine, software that executes android apps.i. App is written ii. Compile to java bytecode iii. DX converts bytecode to a single dexbytecode (classes.dex) iv. DVM executes dexbytecode Was designed to work in resource restrained environment unlike the JVM4. App framework: a. Package manager, a dbase used to store all the apps installed on the device b. Window manager, demo c. Activity manager, manages app life cycle and navigation stack. Demo with music player d. Content provider, dbase that stores shared data among apps eg. Phone system
- #7: Learn details of the android platformLearn and master the tools used to create the apps.
- #14: Such as dial the phone, take a photo, send an email, or view a map.Typically, one activity in an application is specified as the "main" activity, which is presented to the user when launching the application for the first time.When a new activity starts, it is pushed onto the back stack and takes user focus. The back stack abides to the basic "last in, first out" stack mechanism, so, when the user is done with the current activity and presses the Back button, it is popped from the stack (and destroyed) and the previous activity resumes.
- #15: The entire lifetime of an activity happens between the call to onCreate() and the call to onDestroy(). Your activity should perform setup of "global" state (such as defining layout) in onCreate(), and release all remaining resources in onDestroy(). The visible lifetime of an activity happens between the call to onStart() and the call to onStop(). During this time, the user can see the activity on-screen and interact with it. For example, onStop() is called when a new activity starts and this one is no longer visible. Between these two methods, you can maintain resources that are needed to show the activity to the user. The foreground lifetime of an activity happens between the call to onResume() and the call to onPause(). During this time, the activity is in front of all other activities on screen and has user input focus. An activity can frequently transition in and out of the foreground—for example, onPause() is called when the device goes to sleep or when a dialog appears. Because this state can transition often, the code in these two methods should be fairly lightweight in order to avoid slow transitions that make the user wait.