SoFunction
Updated on 2025-04-11

Detailed introduction to Android custom control properties

Detailed introduction to Android custom control properties

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/picture 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.

(1) Attribute definition:

       &lt;declare-styleable name = "name"&gt;
          &lt;attr name = "focusable" format = "boolean" /&gt;
      &lt;/declare-styleable&gt;
 

(2) Attribute usage:

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

4. dimension: dimension value.

(1) Attribute definition:

      &lt;declare-styleable name = "name"&gt;
          &lt;attr name = "layout_width" format = "dimension" /&gt;
      &lt;/declare-styleable&gt;

(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:fromAlpha = "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 = "pivotY" />
          <attr name = "drawable" />
      </declare-styleable>

(2) Attribute usage:

   &lt;animated-rotate
          xmlns:android = "/apk/res/android" 
          android:drawable = "@drawable/picture ID" 
          android:pivotX = "50%" 
          android:pivotY = "50%" 
          android:framesCount = "12" 
          android:frameDuration = "100"
          /&gt;

7. string: string.

(1) Attribute definition:

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

(2) Attribute usage:

  <
          android:layout_width = "fill_parent"
          android:layout_height = "fill_parent"
          android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_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 = "pivotX" format = "fraction" />
          <attr name = "pivotY" format = "fraction" />
          <attr name = "drawable" />
      </declare-styleable>
 

(2) Attribute usage:

 &lt;rotate
          xmlns:android = "/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"
          /&gt;

 9. enum: enum value. 

(1) Attribute definition:

      &lt;declare-styleable name="name"&gt;
          &lt;attr name="orientation"&gt;
             &lt;enum name="horizontal" value="0" /&gt;
             &lt;enum name="vertical" value="1" /&gt;
          &lt;/attr&gt;      
      &lt;/declare-styleable&gt;

(2) Attribute usage:

     <LinearLayout
          xmlns:android = "/apk/res/android"
          android:orientation = "vertical"
          android:layout_width = "fill_parent"
          android:layout_height = "fill_parent"
          >
      </LinearLayout>

10. flag: bit or operation

(1) Attribute definition:

  &lt;declare-styleable name="name"&gt;
          &lt;attr name="windowSoftInputMode"&gt;
              &lt;flag name = "stateUnspecified" value = "0" /&gt;
              &lt;flag name = "stateUnchanged" value = "1" /&gt;
              &lt;flag name = "stateHidden" value = "2" /&gt;
              &lt;flag name = "stateAlwaysHidden" value = "3" /&gt;
              &lt;flag name = "stateVisible" value = "4" /&gt;
              &lt;flag name = "stateAlwaysVisible" value = "5" /&gt;
              &lt;flag name = "adjustUnspecified" value = "0x00" /&gt;
              &lt;flag name = "adjustResize" value = "0x10" /&gt;
              &lt;flag name = "adjustPan" value = "0x20" /&gt;
              &lt;flag name = "adjustNothing" value = "0x30" /&gt;
           &lt;/attr&gt;     
       &lt;/declare-styleable&gt;

(2) Attribute usage:

     <activity
          android:name = ".StyleAndThemeActivity"
          android:label = "@string/app_name"
          android:windowSoftInputMode = "stateUnspecified | stateUnchanged | stateHidden">
          <intent-filter>
             <action android:name = "" />
             <category android:name = "" />
          </intent-filter>
       </activity>

Notice:

Multiple type values ​​can be specified when defining attributes.

(1) Attribute definition:

 
      &lt;declare-styleable name = "name"&gt;
          &lt;attr name = "background" format = "reference|color" /&gt;
      &lt;/declare-styleable&gt;

(2) Attribute usage:

       &lt;ImageView
           android:layout_width = "42dip"
           android:layout_height = "42dip"
           android:background = "@drawable/Image ID|#00FF00"
           /&gt;

Thank you for reading, I hope it can help you. Thank you for your support for this site!