Java DOM: How to add a namespace with a specific prefix?

Question

I am trying to build a simple XML DOM in Java for Android. This works fine but the Android namespace prefix is always set to "ns0" but it should be "android"

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);

doc = factory.newDocumentBuilder().newDocument();
doc.setXmlStandalone(true);

Element manifest = doc.createElement("manifest");
manifest.setAttributeNS("http://www.w3.org/2000/xmlns/","xmlns:android",NS_ANDROID);
manifest.setAttributeNS(NS_ANDROID, "versionName", "bla");
doc.appendChild(manifest);

The output I get is the following:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:ns0="http://schemas.android.com/apk/res/android" ns0:versionName="bla"/>

What do I need to change to get the following result:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
android:versionName="bla"/>

helderdarocha · Accepted Answer · 2014-05-24 14:36:24Z

1

The setAttributeNS() method requires a QName. In your second call you passed an unqualified attribute name, so a default prefix (ns0) was added to it. Since you called it twice, you got two attributes.

To obtain the result you expect, you just have to call setAttributeNS() once with a qualified attribute name:

Element manifest = doc.createElement("manifest");
manifest.setAttributeNS(NS_ANDROID, "android:versionName", "bla");
doc.appendChild(manifest);

answered May 24, 2014 at 14:36

helderdarocha

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