使用declare-styleable给自定义控件添加自定义属性

1.首先,先写attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

<declare-styleable name="TestAttr">
<attr name="name" format="reference" />
<attr name="age">
<flag name="child" value="10" />
<flag name="young" value="18" />
<flag name="oldman" value="60" />
</attr>
<attr name="textSize" format="dimension" />
</declare-styleable>
</resources>

reference指的是是从string.xml引用过来
flag是自己定义的,类似于 android:gravity="top"
dimension 指的是是从dimension.xml里引用过来的内容.注意,这里如果是dp那就会做像素转换

2.在布局文件里的写法

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:attrstest="http://schemas.android.com/apk/res/com.arlos.attrstest"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >s

<com.arlos.attrstest.MyTestView
android:id="@+id/tvTest"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
attrstest:name="@string/myname"
android:gravity="top"
attrstest:age="young"
attrstest:textSize="@dimen/aa"
android:text="@string/hello" />

</LinearLayout>

2.1 先引用这个dtd

xmlns:attrstest="http://schemas.android.com/apk/res/com.arlos.attrstest"
attrstest是随便写的.后面的包名是你所在的项目的根包.也就是在manifest里的com.arlos.attrstest

2.2 在自定义的控件里写属性

3. 最后在控件的构造方法里取得这些值
public class MyTestView extends TextView {

public MyTestView(Context context, AttributeSet attrs) {
super(context, attrs);

TypedArray tArray = context.obtainStyledAttributes(attrs,
R.styleable.TestAttr);
String name = tArray.getString(R.styleable.TestAttr_name);
System.out.println("name = " + name);
int age = tArray.getInt(R.styleable.TestAttr_age, 200);
System.out.println("age = " + age);
float demin = tArray.getDimension(R.styleable.TestAttr_textSize,0);
System.out.println("demin = " + demin);
tArray.recycle();
}
}