Android_declare-styleable_自己定义控件的属性

(1).在res/values文件下定义一个attrs.xml文件

<?

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>

(2).布局文件使用

<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();
}

}

(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]