Android article---Styles and themes common usage possible suspects summary

The difference between 1.style and theme: In short, style refers to the style of a UI control in Android, while themes refers to an activity interface in Android or a whole Android app. The range of theme is larger than the range of style. 2.style Inheritance Usage: (all by the author according to the official document Pro-Test, can be used with confidence, note: the definition of the style is in/res/values/style.xml, and the style is used in the Activity layout file)

• For inheriting the original Android style, use the following block of code, which means to change the TextColor property in the Textappearance style of the Android system to green and the other properties unchanged:

  <name= "Greentext"  parent= "@android: Style/textappearance" >        <  name= "Android:textcolor">#00FF00</Item >    </ style >

  The style is then referenced in the UI control through the value of the <style> label's Name property, for example, referencing the style code block defined above in <TextView> as follows:

  < TextView         Android:text = "Hello style"         android:layout_width= "Match_parent"        android:layout_height= "Wrap_ Content "        style=" @style/greentext "        />

• There are two ways to inherit a custom style, for example, if we already have a custom-defined parent style, the code is as follows:

  <stylename= "Codefont"Parent= "@android: Style/textappearance.medium">        <Itemname= "Android:layout_width">Fill_parent</Item>        <Itemname= "Android:layout_height">Wrap_content</Item>        <Itemname= "Android:textcolor">#00FF00</Item>        <Itemname= "Android:typeface">Monospace</Item>    </style>

  The first is the same as the previous method, with the parent property, followed by the parents style, for example:

  <name= "Red"  parent= "@style/codefont">         <name= "Android:textcolor">#FF0000</  Item>    </style>

  The second is to inherit custom parent style-specific ways, using symbols. Represents an inheritance relationship. For example:

  <name= "codefont.red">        <name = "Android:textcolor" >#FF0000</item>    </style >

  The style is still used in the UI control by referencing the style through the value of the <style> tag's Name property, note that the name is the value of the Name property in the <style> tag

3. When do I use @android:style with @style? @android: Style is reference to the style of the Android system, and @style is a reference to our own style in the/res/values/styles.xml file, the actual principle is this, the format of the resource reference is this:

@[package:]style/style_name

When a style is referenced in a UI control, it is referenced by name, not the file name of the XML, and the file name of the XML can be arbitrary, but in order to see the naming convention, the style is defined for styles.xml. The Android native style is in a package called Android, so the reference is written as @android:style.

Android article---Styles and themes common usage possible suspects summary