Practical Android Course Part II - Layouts, resources, adapters

ANDROID II

CONTACTSYLWESTER MADEJ@smdremedysmd@soldiersofmobile.com

TODAY'S MISSION● Learn LinearLayouts● Play with some views● Get to know onClick vs onClickListener● Understand resources and assets● Learn some Git/Eclipse tricks

ANDROID UI● procedural (java code)● declarative (xml)

LAYOUTS AND VIEWS

COMPOSITE PATTERN

LAYOUT PARAMS● layout_width, layout_height● wrap_content vs match_parent● layout_weight● layout_gravity, gravity● mm, in, px, dp(dip), sp● mdpi 160ppi -> 1dp=1px

RESOURCES: TYPES● layout● drawable● color● values:

– strings.xml– dimens.xml– styles.xml

RESOURCES: SELECTORS● density (ldpi, mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi)● lang (en, pl...)● orientation (land)● version (v14)● sw (720dp)● size (small, large)

DEMO I

Let's do some layouts● activity_login● add colors● add styles.xml + enable it● add dimens● make it look nice● move to strings.xml

TOOLS: HIERARCHY VIEWER

Quick demo

DEMO II

ListView + ArrayAdapterGoogle Gson

HOMEWORK II● Homework:

Create ItemDetailsActivity simillar to this.

This activity should be opened after one of meals was selected on list and should return to list with info was meal ordered.

Want more?

NEXT MISSION● Learn Ajax calls (Aquery or Volley)● Load images dynamically● Implement login/logout● Use preferences (save session)● Make first working (kind of) app!

FOR MORE GO TO:SoldiersOfMobile.com