Namespace is not Bound in Android Studio

Question

If I create a new XML-file (using the default Android Studio "Create Linear Layout"), Studio makes a file with content:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

</LinearLayout>

If I (right)-click "Analyze... → Inspect Code" the result window throws 2 times: "Namespace is not bound" and references to line 3 and 7 (the LinearLayout-tags). Is it a bug in Studio?

Answer 1

If you get the error:

Namespace 'tools' is not bound:

Example:

<activity
    android:name="com.google.android.gms.ads.AdActivity"
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
    tools:replace="android:theme"
    />

Add xmlns:tools="http://schemas.android.com/tools" at the top of the manifest (or activity).

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mypackage"
    xmlns:tools="http://schemas.android.com/tools">