复制键盘错误

Question

我从 android 源复制了键盘视图，但源无法获取 xml 标签值源是

    private void parseKeyboardAttributes(Resources res, XmlResourceParser parser) {
        //attributeSet.getAttributeCount();  = 2 
        AttributeSet attributeSet = Xml.asAttributeSet(parser);
        // but   a.getIndexCount();  = 0 
        // why? i do not know 
        TypedArray a = res.obtainAttributes(attributeSet,
               R.styleable.QmKeyboard);

        mDefaultWidth = getDimensionOrFraction(a,
               R.styleable.QmKeyboard_keyWidth,
                mDisplayWidth, mDisplayWidth / 10);
// cannot get this 
        mDefaultHeight = getDimensionOrFraction(a,
               R.styleable.QmKeyboard_qmKeyHeight,
                mDisplayHeight, 50);

我的 xml 是

<?xml version="1.0" encoding="utf-8"?>
<QmKeyboard xmlns:app="http://schemas.app.com/apk/res-auto"
    app:keyHeight="51dp"
    app:keyWidth="33.0%p">
    <Row>
        <Key
            app:codes="49"
            app:keyLabel="1" />
        <Key
            app:codes="50"
            app:keyLabel="2" />
        <Key
            app:codes="51"
            app:keyLabel="3" />
    </Row>
    // ignore...
</QmKeyboard>

[ https://github.com/guduwangwei/QmKeyboardView][github]

任何人帮助我谢谢