frequent issues arising in android view, Error parsing XML: unbound prefix

Question

I have frequent problem in android view, Error parsing XML: unbound prefix on Line 2.

<?xml version="1.0" encoding="utf-8"?> <LinearLayout android:orientation="vertical" android:id="@+id/myScrollLayout"  android:layout_width="fill_parent"  android:layout_height="wrap_content">     <TextView android:layout_height="wrap_content" android:layout_width="fill_parent"      android:text="Family" android:id="@+id/Family"      android:textSize="16px" android:padding="5px"      android:textStyle="bold" android:gravity="center_horizontal">     </TextView>      <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"         android:layout_width="fill_parent" android:layout_height="wrap_content"         android:orientation="vertical" android:scrollbars="vertical">         <LinearLayout android:orientation="vertical" android:id="@+id/myMainLayout"          android:layout_width="fill_parent"  android:layout_height="wrap_content">         </LinearLayout>     </ScrollView>  </LinearLayout> 

Answer 1

A couple of reasons that this can happen:

1) You see this error with an incorrect namespace, or a typo in the attribute. Like 'xmlns' is wrong, it should be xmlns:android

2) First node needs to contain: xmlns:android="http://schemas.android.com/apk/res/android"

3) If you are integrating AdMob, check custom parameters like ads:adSize, you need

xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"

4) If you are using LinearLayout you might have to define tools:

xmlns:tools="http://schemas.android.com/tools"