Android declare-styleable: Use of custom control attributes (ATTR. XML, typedarray)

Take launcher as an example to describe the attributes of a custom control:

1. Define controls in layout, for example:

<Com. junction. launcher. draglayer

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

Xmlns: Launcher= "Http://schemas.android.com/apk/res/com.junction.launcher"

Android: Id = "@ + ID/drag_layer" Android: layout_width = "match_parent" Android: layout_height = "match_parent">

<Com. Android. launcher. Workspace

Android: Id = "@ + ID/workspace"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

Launcher: defaultscreen = "1">

<Include Android: Id = "@ + ID/cell1" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell2" layout = "@ layout/workspace_screen"/>

<Include Android: Id = "@ + ID/cell3" layout = "@ layout/workspace_screen"/>

</COM. Android. launcher. workspace>

2. There is an attribute under the workspace of the control:Launcher: defaultscreenThis attribute is not defined by viewgroup (workspace class is inherited from viewgroup), so weIt can be defined in attrs. XML in \ res \ values.

The specific definition method is as follows:

<Resources>

<Declare-styleable name = "workspace">

<ATTR name = "defaultscreen" format = "integer"/>

</Declare-styleable>

</Resources>

The reference method isDeclare xmlns: launcher first= "Http://schemas.android.com/apk/res/com.junction.launcher" (R. Java) so you can useLauncher: defaultscreen.

3. In this way, we can remove the value assigned to this attribute in layout in the workspace class. The method is as follows:

Int mdefaultscreen;

Typedarray A = context. obtainstyledattributes (attrs, R. styleable. workspace, defstyle, 0 );

Mdefaultscreen = A. getint (R. styleable. workspace_defaultscreen, 1 );

A. Recycle ();

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Your own case: You can see a GIF player demo program.

Other case: http://blog.csdn.net/Android_Tutor/archive/2010/04/20/5508615.aspx

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Reprinted from: http://blog.csdn.net/tinafhx/archive/2010/02/05/5290878.aspx