Android Starting App Development
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The document provides an overview of Android architecture and app development. It discusses that Android is built on a Linux kernel and consists of libraries, runtime, and core applications. It also covers creating layouts with UI components like ImageView, EditText, Button. Additionally, it summarizes running and debugging apps, activity navigation, and the activity lifecycle.
Android Starting App Development
- 2. Contents Android Architecture Creating New Layouts UI components Running and Debugging apps Activity Navigation
- 4. Android Architecture Linux Kernel Libraries Android Runtime and Core libraries Application Framework Applications
- 6. Linux Kernel Provides Basic System Functionality such as process management, memory management and device management. Provides all device drivers to communicate all different hardware in device like Camera, Sensors, Bluetooth, WiFi, Audio and others.
- 7. Basic Libraries Low level libraries which provide basic features like SQLite Database, web browser, LibC, library for playing and recording Audio/Video etc. Mainly written in C/C++. Interact with device drivers to handle all the basic features of the OS.
- 8. Android Core Libraries Java based libraries that are specific to Android. Interact with Basic libraries to perform desired functionality such as handling recording of Audio and Video. User interface building, Graphics design(2D and 3D) and Database access.
- 9. Dalvik Virtual Machine Each application run in its own instance of Dalvik Virtual machine. Multiple instances of Dalvik VM’s can run efficiently.
- 10. Application Framework Application Manager Activity Manager Notification Manager Location Manager ..and others
- 11. Applications All built in apps And the third party apps ***
- 12. “Till 29th September, 2015 Android activations were 1.4 billion.”
- 13. Let’s Make Layouts - some basics Height and Width - “match_parent” or “wrap_content” or digital value in “dp” Unique id - “@+id/xxx” Naming convention for Id’s - “@+id/tv_login_username”, “@+id/button_login_submit” Naming convention for layouts - activity_login.xml, activity_settings.xml
- 15. Drawables Located in res/drawable/filename.png Support different size/resolution devices. hdpi, mdpi, xhdpi, xxhdpi. Referred in xml as “@drawable/abc” (for abc.png) Usually prefer PNG images, can also use JPG images.
- 18. Button OnClickListener mButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //Do the required task } });
- 20. “Android share in Chinese mobile market is 76.5%”
- 21. Running and Debugging Android Studio features - Clean, Build, Run Android Emulator(Android Virtual Device) Third Party Simulator - Genymotion Displaying Logs ***
- 22. “Average daily Android subscription is 1.5 million.”
- 23. Activities Every Activity will inherit an “Activity”. Inheritance
- 24. Inheritance
- 25. Inheritance Extending a class. Accessing inherited methods and member variables. Overriding methods.
- 26. Start Another Activity - Intents Intent - “A message either to start another Activity or to communicate to another Activity.” Intent Actions - What it should do? Passing Arguments to next Activity
- 27. Sending Data To Activity Intent Parameters
- 28. Arrangement of Activities - Backstack
- 29. Why Activities are Important Application performance and behaviour. Interview Questions!!
- 31. Activity Lifecycle - Callback methods onCreate onStart onResume onPause onStop onDestroy
- 33. ListView
- 34. PlayStore
- 36. But Not To Worry... 800,0000 apps have < 100 downloads. Another 700,000 have < 1000 downloads. Another 400,000 have < 10,000 downloads. Only 35,000 apps are downloaded more than 500,000. ###
- 37. Paramvir Singh, Android Developer and Trainer [email protected] https://in.linkedin.com/in/paramvir-singh-android-developer-b45b5321
Editor's Notes
- #33: See all the methods in code.