Unexpected namespace prefix "xmlns" found for tag LinearLayout

Question

I am having an error in following xml file. "Unexpected namespace prefix "xmlns" found for tag LinearLayout". I tried the solutions provided in other similar questions also but it didn't work for me. Same error is occurring in 3 lines where LinearLayout is used.

<?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:background="@drawable/background" >      <LinearLayout         xmlns:android="http://schemas.android.com/apk/res/android"         android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:orientation="vertical" >          <TextView             android:id="@+id/menu_top_text"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="@string/name_version"             android:textColor="@color/black"             android:textSize="20sp" />          <LinearLayout             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:orientation="horizontal" >         </LinearLayout>          <!-- A horizontal line -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="30px" >         </FrameLayout>          <LinearLayout             xmlns:android="http://schemas.android.com/apk/res/android"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:gravity="center_horizontal"             android:orientation="vertical" >              <LinearLayout                 xmlns:android="http://schemas.android.com/apk/res/android"                 android:layout_width="fill_parent"                 android:layout_height="wrap_content"                 android:gravity="center"                 android:orientation="horizontal" >                  <Button                     android:id="@+id/start_stop_button"                     android:layout_width="74dp"                     android:layout_height="74dp"                     android:text="@string/start_server" />                  <Button                     android:id="@+id/instructions"                     android:layout_width="120dp"                     android:layout_height="74dp"                     android:text="@string/instructions_label" />                  <Button                     android:id="@+id/setup"                     android:layout_width="74dp"                     android:layout_height="74dp"                     android:text="@string/setup_label" />             </LinearLayout>         </LinearLayout>          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="30px" >         </FrameLayout>          <!-- A horizontal line -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="1px"             android:background="#666666" >         </FrameLayout>          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="10px" >         </FrameLayout>          <TableLayout             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:shrinkColumns="2" >              <TableRow>                  <TextView                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:gravity="left"                     android:text="@string/server_status"                     android:textColor="@color/black"                     android:textSize="16sp" />                 <!-- A small spacer between the columns -->                  <FrameLayout                     android:layout_width="3sp"                     android:layout_height="wrap_content" />                  <TextView                     android:id="@+id/server_status"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:text="@string/unknown"                     android:textColor="@color/black"                     android:textSize="16sp" />             </TableRow>         </TableLayout>          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="10px" >         </FrameLayout>          <!-- A horizontal line -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="1px"             android:background="#666666" >         </FrameLayout>          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="10px" >         </FrameLayout>          <TableLayout             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:shrinkColumns="2" >              <TableRow>                  <TextView                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:gravity="left"                     android:text="@string/my_url_is"                     android:textColor="@color/black"                     android:textSize="16sp" />                 <!-- A small spacer between the columns -->                  <FrameLayout                     android:layout_width="3sp"                     android:layout_height="wrap_content" />                  <TextView                     android:id="@+id/ip_address"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:text="@string/no_url_yet"                     android:textColor="@color/black"                     android:textSize="16sp" />             </TableRow>              <TableRow>                  <TextView                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:gravity="left"                     android:text="@string/wifi_status"                     android:textColor="@color/black"                     android:textSize="16sp" />                 <!-- A small spacer between the columns -->                  <FrameLayout                     android:layout_width="3sp"                     android:layout_height="wrap_content" />                  <TextView                     android:id="@+id/wifi_status"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:text="@string/unknown"                     android:textColor="@color/black"                     android:textSize="16sp" />             </TableRow>              <TableRow>                  <TextView                     android:id="@+id/last_error_label"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:gravity="left"                     android:text="@string/last_error"                     android:textSize="16sp"                     android:visibility="gone" />                 <!-- A small spacer between the columns -->                  <FrameLayout                     android:layout_width="3sp"                     android:layout_height="wrap_content" />                  <TextView                     android:id="@+id/last_error"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:text="@string/unknown"                     android:textColor="#ff0000"                     android:textSize="16sp"                     android:visibility="gone" />             </TableRow>         </TableLayout>          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="10px" >         </FrameLayout>          <!-- A horizontal line -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="1px"             android:background="#666666" >         </FrameLayout>          <!--           <TextView android:id="@+id/proxy_header"         android:layout_height="wrap_content"         android:layout_width="wrap_content"         android:text="@string/proxy_experimental"         android:textSize="16sp"         />         -->          <TableLayout             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:shrinkColumns="2" >              <TableRow>                  <!--                  <TextView                 android:layout_height="wrap_content"                 android:layout_width="wrap_content"                 android:text="@string/proxy_status"                 android:textSize="16sp"                 android:gravity="left"                 />                 -->                 <!-- A small spacer between the columns -->                  <FrameLayout                     android:layout_width="3sp"                     android:layout_height="wrap_content" />             </TableRow>              <TableRow>                  <!-- A small spacer between the columns -->                  <FrameLayout                     android:layout_width="3sp"                     android:layout_height="wrap_content" />             </TableRow>              <TableRow>                  <!-- A small spacer between the columns -->                  <FrameLayout                     android:layout_width="3sp"                     android:layout_height="wrap_content" />             </TableRow>              <TableRow>                  <!-- A small spacer between the columns -->                  <FrameLayout                     android:layout_width="3sp"                     android:layout_height="wrap_content" />             </TableRow>         </TableLayout>          <!-- A horizontal line -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="1dp"             android:background="#666666" >         </FrameLayout>          <!-- A horizontal line -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="1dp"             android:background="#666666" >         </FrameLayout>          <LinearLayout             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:orientation="horizontal"             android:visibility="gone" >              <TextView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="@string/server_log"                 android:textColor="#ffffff" />              <CheckBox                 android:id="@+id/server_log_checkbox"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:checked="false" />         </LinearLayout>          <TextView             android:id="@+id/server_log"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:background="#333333" />          <!-- A horizontal line -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="1dp"             android:background="#666666"             android:visibility="gone" >         </FrameLayout>          <LinearLayout             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:orientation="horizontal"             android:visibility="gone" >              <TextView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="@string/session_monitor"                 android:textColor="#ffffff"                 android:visibility="gone" />              <CheckBox                 android:id="@+id/session_monitor_checkbox"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:checked="false"                 android:visibility="gone" />         </LinearLayout>          <TextView             android:id="@+id/session_monitor"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:background="#333333"             android:visibility="gone" />          <!-- A horizontal line -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="1dp"             android:background="#666666" >         </FrameLayout>          <!-- It's visually pleasing to have some empty space at the bottom -->          <FrameLayout             android:layout_width="fill_parent"             android:layout_height="15dp" />     </LinearLayout>  </ScrollView> 

Answer 1

Please try following:

Remove xmlns:android="http://schemas.android.com/apk/res/android from all the places excluding the ScrollView. I believe it is sufficient to inform it to the application once and in the outermost Layout or View of the xml file.

Answer 2

I encountered this problem multiple times with various codes.

The codes were running absolutely fine in the past but now they are showing these errors....

I found a very simple solution, doesn't require any code changes (Addition, edit or deletion).

Go to the Project Tab at the tab Click on the tab Select the "Clean...." from the list

You will see the list of all the projects opened in your work space.

You can either select one project or all (I generally do "Clean all projects"). Click Ok. The process takes around 5-7 sec for around 10 projects. All the XMLNS errors are resolved... You should try this before trying any other solution.... This is like restarting the system for Window's error which resolves problems 70% of the times...

The above solution is more of a temp solution working in all situation.. To avoid the situation in future, I all xmlns codes together at the top. (there may be a duplicate statement that may be required to be deleted)

I was having this issue when integrating Admob on the XML file.