Detailed description of Custom Attributes in Android

1. Reference: refer to a resource ID.

 

(1) attribute definition:

 

<Declare-styleable name = "name">

<ATTR name = "background" format = "Reference"/>

</Declare-styleable>

 

(2) attribute usage:

 

<Imageview

Android: layout_width = "42dip"
Android: layout_height = "42dip"
Android: Background = "@ drawable/image ID"

/>

 

2. Color: color value.

 

(1) attribute definition:

 

<Declare-styleable name = "name">

<ATTR name = "textcolor" format = "color"/>

</Declare-styleable>

 

(2) attribute usage:

 

<Textview

Android: layout_width = "42dip"
Android: layout_height = "42dip"
Android: textcolor = "#00ff00"

/>

 

3. boolean: Boolean value.

 

(1) attribute definition:

 

<Declare-styleable name = "name">

<ATTR name = "focusable" format = "Boolean"/>

</Declare-styleable>

 

(2) attribute usage:

 

<Button

Android: layout_width = "42dip"
Android: layout_height = "42dip"

Android: focusable = "true"

/>

 

4. dimension: dimension value.

 

(1) attribute definition:

 

<Declare-styleable name = "name">

<ATTR name = "layout_width" format = "dimension"/>

</Declare-styleable>

 

(2) attribute usage:

 

<Button

Android: layout_width = "42dip"
Android: layout_height = "42dip"

/>

 

5. Float: floating point value.

 

(1) attribute definition:

 

<Declare-styleable name = "alphaanimation">

<ATTR name = "fromalpha" format = "float"/>
<ATTR name = "toalpha" format = "float"/>

</Declare-styleable>

 

(2) attribute usage:

 

<Alpha
Android: fromalphi = "1.0"
Android: toalpha = "0.7"

/>

 

6. Integer: integer value.

 

(1) attribute definition:

 

<Declare-styleable name = "animatedrotatedrawable">

<ATTR name = "visible"/>
<ATTR name = "frameduration" format = "integer"/>
<ATTR name = "framescount" format = "integer"/>
<ATTR name = "pivotx"/>
<ATTR name = "ty"/>
<ATTR name = "drawable"/>

</Declare-styleable>

 

(2) attribute usage:

 

<Animated-Rotate

Xmlns: Android = "http://schemas.android.com/apk/res/android"
Android: drawable = "@ drawable/image ID"
Android: Required Tx = "50%"
Android: Ty = "50%"
Android: framescount = "12"
Android: frameduration = "100"

/>

 

7. String: string.

 

(1) attribute definition:

 

<Declare-styleable name = "mapview">
<ATTR name = "apikey" format = "string"/>
</Declare-styleable>

 

(2) attribute usage:

 

<Com. Google. Android. Maps. mapview
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Android: apikey = "0jokq80od1jl9c6haja99ugxcri2cgjko_bc_g"

/>

 

8. fraction: percentage.

 

(1) attribute definition:

 

<Declare-styleable name = "rotatedrawable">
<ATTR name = "visible"/>
<ATTR name = "fromdegrees" format = "float"/>
<ATTR name = "todegrees" format = "float"/>
<ATTR name = "effectx" format = "fraction"/>
<ATTR name = "ty" format = "fraction"/>
<ATTR name = "drawable"/>
</Declare-styleable>

 

(2) attribute usage:

 

<Rotate

Xmlns: Android = "http://schemas.android.com/apk/res/android"
Android: interpolator = "@ anim/animation ID"

Android: fromdegrees = "0"
Android: todegrees = "360"

Android: Required Tx = "200%"

Android: Ty = "300%"
Android: duration= "5000"

Android: repeatmode = "restart"

Android: repeatcount = "infinite"

/>

 

9. Enum: enumeration value.

 

(1) attribute definition:

 

<Declare-styleable name = "name">
<ATTR name = "orientation">
<Enum name = "horizontal" value = "0"/>
<Enum name = "vertical" value = "1"/>
</ATTR>

</Declare-styleable>

 

(2) attribute usage:

 

<Linearlayout

Xmlns: Android = "http://schemas.android.com/apk/res/android"
Android: Orientation = "vertical"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
>
</Linearlayout>

 

10. Flag: bitwise OR operation.

 

(1) attribute definition:

 

<Declare-styleable name = "name">
<ATTR name = "windowsoftinputmode">
<Flag name = "stateunspecified" value = "0"/>
<Flag name = "stateunchanged" value = "1"/>
<Flag name = "statehidden" value = "2"/>
<Flag name = "statealwayshidden" value = "3"/>
<Flag name = "statevisible" value = "4"/>
<Flag name = "statealwaysvisible" value = "5"/>
<Flag name = "adjustunspecified" value = "0x00"/>
<Flag name = "adjustresize" value = "0x10"/>
<Flag name = "adjustpan" value = "0x20"/>
<Flag name = "adjustnothing" value = "0x30"/>
</ATTR>

</Declare-styleable>

 

(2) attribute usage:

 

<Activity

Android: Name = ". styleandthemeactivity"
Android: Label = "@ string/app_name"
Android: windowsoftinputmode = "stateunspecified | stateunchanged | statehidden">
<Intent-filter>
<Action Android: Name = "android. Intent. Action. Main"/>
<Category Android: Name = "android. Intent. Category. launcher"/>
</Intent-filter>
</Activity>

 

Note:

 

You can specify multiple types of values when defining attributes.

 

(1) attribute definition:

 

<Declare-styleable name = "name">

<ATTR name = "background" format = "reference | color"/>

</Declare-styleable>

 

(2) attribute usage:

 

<Imageview

Android: layout_width = "42dip"
Android: layout_height = "42dip"
Android: Background = "@ drawable/image ID | #00ff00"

/>