1. Development of custom components

I. Custom Component Classification

Customized component: inherits the view and adds more attributes and events. Horizontal scaling

Compound component:

Inherit viewgroup and assemble multiple simple controls into one composite control by layout. Horizontal scaling

 

Ii. Define component steps

1. Select an inheritance class (it must be a subclass of view or view ).

Class 2 initialization: Initial Value Setting of new property attributes.

3. overload method:

Layout and rendering ondraw (), onmeasure ()

Event (Custom Event) onkeyevent ()... listener/overload Function

Principle]

For this project only, you can use inner class;

If you are planning to release it commercially, you need to use a separate class file;

If you plan to release the product commercially, do not use the XML layout file instead of dynamic code generation;

 

3. Use Components

[Internal class]

<View

Class = "com. Android. notepad. noteeditor $ myedittext"

Id = "@ + ID/Note"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

Android: Background = "@ Android: drawable/empty"

Android: padding = "10dip"

Android: scrollbars = "vertical"

Android: fadingedge = "vertical"/>

 

[Non-internal class]

<Com. Android. notepad. myedittext

Id = "@ + ID/Note"

.../>

 

1. Development of custom components