Mind Map Gallery Android
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Android
A mind map about android.
Edited at 2020-09-08 01:24:18
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- Outline
Android
Components
Activitie
Presents a single visual user interface
each activity is indepentdent of the others
one of the activities is marked as the first
intents
Service
Broadcast receiver
Content Provider
User Interface
View Class
represent the basic bulding block for UI component
A view occupies arectangular area on the screen and is responsible for drawing and event handling
base class for widgets
Group view
Xml Layouts
LinearLayout
are lined up in a column or row
areas of control
orientation
fill model
weight
gravity
padding
margin
RelativeLayout
TableLayout
ScrollView
AbsoluteLayout
Each element in XML layout is either a view or groupView
is the base class for layouts
Menus
Increase the functionality of an app
2 types
option menu
context menu
Observation
text
Icons
Radio Buttons
Checkboxs
Sub-Menus
Short-cut Keys
using
step1
Indicate which widget(s) on your activity have contextMenu
step2
Implement onCreateContextMenu(...)
onCreateContextMenu() is called each time the context menu is requested
context menus are discarded once they are used or dismissed
onContextItemSelected()
delegate on the applyMenuChoice() Method the performing of the actions associated to the choices made by user
Widgets
Life cycle
Components lifecycle
A beginning when android instantiates them response to intents
A end when the instances are destroyed
In between they somtimes be active / inactive ,visible/invisible
Activity Stack
States
Event
Project
YourActivity.java
R.java
Android Library/
assets/
res/
res/drawable
res/layout
res/values
AndroidManifest.xml