java - Xmlparser.getText() 给出 null

Question

我正在尝试从预设的 xml 文件中提取值，但当我尝试检查该值是什么时，我总是得到 null。

if (pulled.equals("preset")) {
    presetName = xmlParser.getAttributeValue(null,"name");
    Log.d(TAG, presetName + " = " + xmlParser.getText());
}

这是从中提取值的 xml im

<?xml version="1.0" encoding="utf-8"?>
<sports>
    <sport name="Baseball" paid="false">
        <preset name="Pitching Mound">726.0</preset>
        <preset name="Base Distance">1080.0</preset>
    </sport>
    <sport name="Basketball" paid="false">
        <preset name="NBA Free Throw Line">181.08</preset>
        <preset name="NBA 3pt Line">265.8</preset>
    </sport>
    <sport name="Cricket" paid="true">
        <preset name="Cricket Pitch">2012.0</preset>
        <preset name="Testing">0.8</preset>
    </sport>
</sports>

我做错了什么吗？

Answer 1

在 XmlPullParser api 上，getText() 方法具有以下描述:

Returns the text content of the current event as String. The value returned depends on current event type, for example for TEXT event it is element content (this is typical case when next() is used). See description of nextToken() for detailed description of
possible returned values for different types of events.

NOTE: in case of ENTITY_REF, this method returns the entity replacement text (or null if not available). This is the only case where getText() and getTextCharacters() return different values.

因此根据此描述，首先您必须检查当前 xml 节点是否为 TEXT，以便 getText() 不会返回 null。

if (pulled.equals("preset")) {
    presetName = xmlParser.getAttributeValue(null,"name");
    if (xmlParser.getEventType() == XmlPullParser.TEXT) {
       Log.d(TAG, presetName + " = " + xmlParser.getText());
    }
}

希望对您有所帮助，