In depth parsing of the Android custom property format

1. reference: refer to ID.
(1) property definition:

<declare-styleable name = " The name of the ">
   <attr name = "background" format = "reference" />
</declare-styleable>

(2) property use:

 <ImageView
 android:layout_width = "42dip"
 android:layout_height = "42dip"
 android:background = "@drawable/ The picture ID"
 />

2. color: color value.
(1) property definition:

<declare-styleable name = " The name of the ">
   <attr name = "textColor" format = "color" />
</declare-styleable>

(2) property use:

<TextView
 android:layout_width = "42dip"
 android:layout_height = "42dip"
 android:textColor = "#00FF00"
 />

3. boolean: Boolean value.
(1) property definition:

<declare-styleable name = " The name of the ">
   <attr name = "focusable" format = "boolean" />
</declare-styleable>

(2) property use:

<Button
android:layout_width = "42dip"
android:layout_height = "42dip"
android:focusable = "true"
/>

4. dimension: size value.
(1) property definition:

<declare-styleable name = " The name of the ">
   <attr name = "layout_width" format = "dimension" />
</declare-styleable>

(2) property use:

<Button
android:layout_width = "42dip"
android:layout_height = "42dip"
/>

5. float: floating point value.
(1) property definition:

<declare-styleable name = "AlphaAnimation">
   <attr name = "fromAlpha" format = "float" />
   <attr name = "toAlpha" format = "float" />
</declare-styleable>

(2) property use:

<alpha
   android:fromAlpha = "1.0"
   android:toAlpha = "0.7"
   />

6. integer: integer value.
(1) property definition:

<declare-styleable name = "AnimatedRotateDrawable">
   <attr name = "visible" />
   <attr name = "frameDuration" format="integer" />
   <attr name = "framesCount" format="integer" />
   <attr name = "pivotX" />
   <attr name = "pivotY" />
   <attr name = "drawable" />
</declare-styleable>

(2) property use:

<animated-rotate
   xmlns:android = "http://schemas.android.com/apk/res/android"  
   android:drawable = "@drawable/ The picture ID"  
   android:pivotX = "50%"  
   android:pivotY = "50%"  
   android:framesCount = "12"  
   android:frameDuration = "100"
   />

7. string: string.
(1) property definition:

<declare-styleable name = "MapView">
   <attr name = "apiKey" format = "string" />
</declare-styleable>

(2) property use:

<com.google.android.maps.MapView
android:layout_width = "fill_parent"
android:layout_height = "fill_parent"
android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"
/>

8. fraction: percentage.
(1) property definition:

<declare-styleable name="RotateDrawable">
   <attr name = "visible" />
   <attr name = "fromDegrees" format = "float" />
   <attr name = "toDegrees" format = "float" />
   <attr name = "pivotX" format = "fraction" />
   <attr name = "pivotY" format = "fraction" />
   <attr name = "drawable" />
</declare-styleable>

(2) property use:

<rotate
   xmlns:android = "http://schemas.android.com/apk/res/android" 
　　 android:interpolator = "@anim/ animation ID"
   android:fromDegrees = "0" 
　　 android:toDegrees = "360"
   android:pivotX = "200%"
   android:pivotY = "300%" 
　　 android:duration = "5000"
   android:repeatMode = "restart"
   android:repeatCount = "infinite"
   />

9. enum: enumeration values.
(1) property definition:

<declare-styleable name=" The name of the ">
   <attr name="orientation">
  <enum name="horizontal" value="0" />
  <enum name="vertical" value="1" />
   </attr>
</declare-styleable>

(2) property use:

<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: bit or operation.
(1) property definition:

 <ImageView
 android:layout_width = "42dip"
 android:layout_height = "42dip"
 android:background = "@drawable/ The picture ID"
 />

8
(2) property use:

 <ImageView
 android:layout_width = "42dip"
 android:layout_height = "42dip"
 android:background = "@drawable/ The picture ID"
 />

9
Note:
You can specify multiple type values when defining a property.
(1) property definition:

<declare-styleable name = " The name of the ">
   <attr name = "textColor" format = "color" />
</declare-styleable>

0
(2) property use:

 <ImageView
 android:layout_width = "42dip"
 android:layout_height = "42dip"
 android:background = "@drawable/ The picture ID|#00FF00"
 />