Android Learning Essay UI Landscaping (i)---------styles and Themes

1. use of styles and themes

Styles and themes are the same, and are collections of a series of properties that apply to a single control , such as Textview,button, if the object is applied differently. The theme app appears as an attribute in the <application> or <activity> tab of the feature manifest file , such as:

<application theme= "XXX"/>

<activity theme= "XXX"/>

To see a list file:

Here are the two points to be clear:

1, the theme is applied to the application or activity tag, used to set the overall appearance properties of an entire application or an activity .

2. if a theme is specified at the same time , the subject on the Activity tab will prevail .

Androidmanifest.xml

<?xml version= "1.0" encoding= "Utf-8"? ><manifest xmlns:android= "http://schemas.android.com/apk/res/ Android "package=" Com.example.day27_uitest "android:versioncode=" 1 "android:versionname=" 1.0 "> &LT;USES-SD K android:minsdkversion= "android:targetsdkversion="/> <application android:allowback Up= "true" android:icon= "@drawable/ic_launcher" android:label= "@string/app_name"android:theme= "@style/apptheme"> <activity android:name= ". Mainactivity "android:label=" @string/app_name "android:theme= "@style/apptheme"> <intent-filter> <action android:name= "Android.intent.action.MAIN"/> <category android:name= "Android.intent.category.LAUNCHER"/> </intent-filter> </acti Vity> </application></manifest>

　2, custom style (here I understand: Here style is like css< cascading style sheet, to standardize some of the appearance)

MyStyle. Xml

<Resourcesxmlns:android= "Http://schemas.android.com/apk/res/android">    <!--Base application theme, dependent on API level.       This theme are replaced by Appbasetheme from Res/values-vxx/styles.xml on newer devices.  -    <stylename= "Appbasetheme"Parent= "Theme.AppCompat.Light"><!--Theme customizations available in newer API levels can go in res/values-vxx/styl         Es.xml, while customizations related to Backward-compatibility can go. -</style>    <!--application theme. -    <stylename= "Apptheme"Parent= "Appbasetheme"><!--all customizations, that is, specific to a particular api-level can go.</style>    <!--Customizing a style to an application use the Parent property to specify the style of the current style, either by referencing the system style or by referring to a user-defined style -    <stylename= "Myapptheme"Parent= "Apptheme"><!--All customizations that is not specific to a particular api-level can go here--<item Name= "Android:textcolor" > @android:color/white</item></style>    <!--Customizing a style for the current interface activity, the style defined in acvitity, which is valid for all controls in the interface -    <stylename= "Mymainactivitytheme"Parent= "Myapptheme"><item name= "android:textsize" >10sp</item> <item name= "Android:textcolor" > #00FF00 </ Item></style>    <!--Customizing the style of a control in a layout file create a sub-style using the parent style prefix, but this usage can only refer to user-defined styles and cannot reference system styles. In other words, referencing a system style can only use the Parent property.             If you use a custom style for both the prefix and the parent property, the parental style specified by the parents property will prevail.  -    <stylename= "Mymainactivitytheme.mytextviewstyle" ><item name= "android:textsize" >20sp</item> <item name= "Android:textcolor" > #FF0000 < ;/item></style>    <stylename= "Mymainactivitytheme.mytextviewstyle2"><item name= "android:textsize" >40sp</item> <item name= "Android:textcolor" > #0000FF < /item></style>        <stylename= "Style_mine"><!--ctrl+alt+ down ARROW key to complete line copy--<item name= "Android:layout_width" >wrap_content</item> <item name= "Android:layout_height" >wrap_content</item></style>    </Resources>

In this file: the first and second styles are the system's own style

The third fourth is a custom style with the parent style

The fifth sixth is a custom style with a parent style prefix, which should be noted at this point:

  If you use a custom style for both the prefix and the parent property, the parental style specified by the parents property will prevail.

The seventh is a custom style without any parent style.

Android Learning Essay UI Landscaping (i)---------styles and Themes