Question

I would like to use lxml to change some attribute values of an android xml file.

For example:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent">
    <TextView android:id="@+id/version_label"
              android:layout_marginLeft="5sp"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:text="version"/>
</LinearLayout>

I want to change the “android:text” value, but

textViewTagNode.attrib['android:text'] = "new value" 

couldn’t work, neither

textViewTagNode.set('android:text', 'new value')

could work. All I get is “Invalid attribute name u’android:text’ “

I know it’s the namespace problem, but I don’t know how to fix it.

Thanks a lot.

Answer 1

Your key is not 'android:text' but '{http://schemas.android.com/apk/res/android}text'

In [23]: s = '''<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent">
    <TextView android:id="@+id/version_label"
              android:layout_marginLeft="5sp"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:text="version"/> </LinearLayout>'''

In [24]: tree = etree.XML(s)                                          


In [25]: c = tree.getchildren()[0]

In [26]: c.items()
Out[26]:  [('{http://schemas.android.com/apk/res/android}id', '@+id/version_label'),  ('{http://schemas.android.com/apk/res/android}layout_marginLeft', '5sp'),  ('{http://schemas.android.com/apk/res/android}layout_width', 'fill_parent'),  ('{http://schemas.android.com/apk/res/android}layout_height', 'wrap_content'),  ('{http://schemas.android.com/apk/res/android}text', 'version')]