zodsoft / android-coding-guidelines

Android cod

Android Coding Guidelines

Follow Android coding style except for:

• No warnings
• No switch/case statements
• Use CamelCase for instance members
• Use underscore_case for variables
• All variables must be final (except int i)
• By default, all methods private and final
• Hungarian notation:
  • btSomething is a Button
  • frSomething is a Fragment
  • ivSomething is an ImageView
  • lvSomething is a ListView
  • tvSomething is a TextView
  • vpSomething is a ViewPager
  • mSomething for the rest
  • sSomething for static members

Activities

• Activity class names must end with "Activity"
• Activity classes are final by default
• onCreate must call private methods findViews(), setListeners(), fetchData() and loadData()
• findViews(): sets all view instance members (findViewById goes here)
• setListeners(): sets all listeners on views. Let the Activity implement OnClickListener, etc.
• fetchData(): retrieve data to be displayed by this activity, be it from the filesystem, database, network, etc.
• loadData(): display the data on the views (tv.setText, lv.setAdapter goes here)

Layouts

• Layout file for SomethingActivity is something_layout.xml
• View ids use the same name as the activity instance member variables, i.e. tvSomething, lvSomething, etc.
• Separate layout files in folders by minimum screen width. Make scrollable on shorter screens

Resources

• Resource names must contain a class prefix. A string resource used in SomethingActivity will be R.string.something_astring
• Do not use drawable/ folder, use drawable-nodpi instead. No bitmaps