declare-styleable的使用

declare-styleable是給自定義控件添加自定義屬性用的

1.首先,先寫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指的是是從string.xml引用過來

flag是本身定義的,相似於 android:gravity="top"

dimension 指的是是從dimension.xml裏引用過來的內容.注意,這裏若是是dp那就會作像素轉換 2.在佈局文件裏的寫法

<?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 先引用這個dtd

xmlns:attrstest="http://schemas.android.com/apk/res/com.arlos.attrstest"

attrstest是隨便寫的.後面的包名是你所在的項目的根包.也就是在manifest裏的com.arlos.attrstest

 2.2 在自定義的控件裏寫屬性 3. 最後在控件的構造方法裏取得這些值

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();
    }
}