Android_declare-styleable_自己定义控件的属性
1.简单实例
(1).在res/values文件下定义一个attrs.xml文件
<?(2).布局文件使用xml version="1.0" encoding="utf-8"?
> <resources> <declare-styleable name="my"> <attr name="content" format="string" /> <attr name="backcolor" format="reference|color" /> </declare-styleable> </resources>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:my="http://schemas.android.com/apk/res/com.example.xmpptest" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <com.example.xmpptest.MyTextView android:layout_width="match_parent" android:layout_height="wrap_content" my:content="mycolor" > </com.example.xmpptest.MyTextView> </LinearLayout>(3).自己定义控件设置public class MyTextView extends TextView { public MyTextView(Context context) { this(context, null); } public MyTextView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.my); String str = a.getString(R.styleable.my_content); setText(str + "@@"); a.recycle(); } }
2.其他备注
(1).定义的每一个attr中format应该为指定的类型,string/integer/dimension/reference(引用R文件)/color/enum/boolean。多个format能够使用|隔开,其他都一样。实例enum
<declare-styleable name="my"> <attr name="content" format="string" /> <attr name="backcolor" format="reference|color" /> <attr name="size"> <enum name="fill_parent" value="-1" /> <enum name="wrap_content" value="-2" /> </attr> </declare-styleable>(2).布局文件里的XML namespace规则。xmlns:toolbar=http://schemas.android.com/apk/res/[packagename]