Custom control's property definition and use

Sometimes in order to complete some functions, you need to combine some system controls, for later use, you can separate this function into a separate control, the use of some parameters can be set the properties of the control, set in the XML, the steps are as follows:

1. Create a custom control Extendsview extends View

2. Define a Attrs.xml file under the values file

1 <?xml version= "1.0" encoding= "Utf-8"?>  2 <resources>  3     < Declare-styleable name= "extendsview" >  4         <attr name= "myattr" format= "Boolean"/>  5     </declare-styleable>  6 </resources>  

3. Get the property value in the constructor of the custom control

1  PublicExtendsview (Context context,attributeset attrs)2     {  3         Super(Context,attrs); 4    5TypedArray A =context.obtainstyledattributes (Attrs,6 r.styleable.  Extendsview); 7           8         BooleanMyAttr =A.getcolor (r.styleable.  Extendsview_myattr,9                 false); Ten   One a.recycle ();  A}

4. Use in XML, root layout add xmlns:app= "Http://schemas.android.com/apk/res-auto"

<view app:myattr= "true"/>

Custom control's property definition and use