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>

Shobhit Puri · Accepted Answer · 2013-07-02T23:40:53.367

85

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.

edited Jul 02 '13 at 23:40

answered Feb 17 '13 at 00:22

Shobhit Puri

25,769
11
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2

It's very odd (and non-conformant) that the parser should reject a duplicate namespace declaration. Which XML parser is this? – Michael Kay Feb 17 '13 at 08:55
1

Sir, How to see which parser is being used? I have been using the default parser that came with Eclipse ADT bundle. – Shobhit Puri Feb 18 '13 at 06:30
1

Thanks, leaving the xmlns line in the main linear layout, and removing it from the rest of the nested layouts worked. – cwiggo Jul 01 '13 at 09:07

Sudhir · Answer 2 · 2013-08-27T04:29:33.097

43

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.

edited Aug 27 '13 at 04:29

answered Mar 24 '13 at 19:56

Sudhir

431
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Absolutely. This is the first thing that one should try. Many a times cleaning the project works and some other solution suggest the same. But, it was not working for me even after that and removing that line worked. – Shobhit Puri Apr 02 '13 at 23:44
If you even don't want to wait projects cleaning time, open the Problems view in eclispe, select the error coming from the xml namespace and delete them(press Canc or select Delete in the contextual menu). Funny eclipse, isn't it? – hara Jan 19 '14 at 10:34
Hello guys, the above solution does not match with me, but this solution is so perfect and it worked fine ... Big Thanks @Sudhir .. – Ahmad MOUSSA Sep 17 '14 at 06:50

score 6 · Answer 3 · answered Jun 02 '13 at 01:46

In an Android xml file, the Android namespace can:

only be declared once
only be declared in the top ('outer') Android View in the xml hierarchy

or you'll receive an error when building the project. In your case, the top Android view is the ScrollView, so keep

xmlns:android="http://schemas.android.com/apk/res/android"

in the ScrollView, and remove it from all other nested Views, including the LinearLayout.

user26676 · Answer 4 · 2013-04-16T09:54:02.957

4

for people who suddenly see this message appear, the comment from Sudhir should be the accepted answer.. the English wasn't that good I thought : so if you struggle: in eclipse go to project menu click clean... and pick clean all projects this will remove the random appearance of this as a message in a situation where it was missing before

edited Apr 16 '13 at 09:54

answered Apr 09 '13 at 09:11

user26676

280
3
21

In my case @Shobhit's answer is correct. Sudhir's recommendation to do a full Clean/Rebuild, although valid, is too obvious for the majority of users. – David Manpearl May 10 '13 at 21:28
I agree with @DavidManpearl, Sudhir's answer is a workaround, Shobhit's one is a permanent solution – Jose_GD Aug 07 '13 at 21:59

score 1 · Answer 5 · edited Dec 24 '15 at 07:29

1

I think remove the unneeded line is a more suitable way because:

1) Clean the Project will only resolve the problem once. And if you launch the project again or switch from another file to this xml file, it will show the error again.

2) More importantly, "xmlns:XXX" should be the property of the first node.

edited Dec 24 '15 at 07:29

ngrashia

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answered Mar 20 '14 at 02:05

lilingmzai

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score 0 · Answer 6 · edited Mar 05 '14 at 14:34

0

xmlns:android="http://schemas.android.com/apk/res/android

remove the above tag

and keep

<fragment
..........
........
........
......../>

or </fragment>

edited Mar 05 '14 at 14:34

TLama

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answered Mar 05 '14 at 14:15

user3040657

1

18446744073709551615 · Answer 7 · 2015-06-19T12:40:18.050

0

To make this problem disappear once and forever without mass changes in the source (that would introduce noise to version tracking):

Go to the "Problems" tab -- right click on the message -- select "Quick fix". A window appears where you can tell Eclipse to ignore this problem in the project (or in just one file, if you wish).

After that, the XML will compile ok.

edited Jun 19 '15 at 12:40

answered Jun 19 '15 at 12:33

18446744073709551615

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Unexpected namespace prefix "xmlns" found for tag LinearLayout

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