Use styles in Android

Attrs. xml defines attributes:
If I define the control mycustomwidget myself, in Main. XML, I want to use this control and set the property Android: textsize =. How can I set this?

Where does this property come from? You need to set attrs. XML, create such a file in the values directory, and then the content is as follows:
<Resources>

<Declare-styleable name = "mycustomview">

<ATTR name = "text" format = "string"/>

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

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

</Declare-styleable>

</Resources>

What is the value type of some attribute names?

Well, now that we have this property type, we can set the property in layout.

Xmlns: Android = "http://schemas.android.com/apk/res/android"

Add one sentence below.

Xmlns: myview = "http://schemas.android.com/apk/res/com.ui"

Myview is the namespace. you can name it at will. com. UI is the name of the package that declares the control property.

With this, you should understand why the control attributes are set to Android.
<Com. UI. mycustomview

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

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Myview: text = "@ string/app_name"
Myview: textsize = "32dp"
Myview: textcolor = "@ drawable/yellow"/>

In this way, you can set attributes.
Styles usage:

Styles. XML is used to define a set of attribute values. Format.
<? XML version = "1.0" encoding = "UTF-8"?>

<Resources>

<Style name = "mycustomview">

<Item name = "textcolor"> # ffff0000 </item>

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<Item name = "textsize"> 60dp </item>

</Style>

</Resources>
Styles is essentially a set of attribute values.

In this way, the style can be referenced by the style name in layout. For example, style = "@ style/mycustomview.