You must specifiy a layout in the include tag: include layout="@layout/layoutID

Problem Descrption:

Caused by: android.view.InflateException: You must specifiy a layout in the include tag:<include layout="@layout/layoutID"/>"

Solution 1:

I find answer to my own question. In my tool activity_main xml layout i replaced android:layout="@layout/tool_bar" with layout="@layout/tool_bar" and in tool bar layout android.widget.Toolbar with android.support.v7.widget.Toolbar Check out below my both xml files

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <include
        android:id="@+id/tool_bar"
        android:layout="@layout/tool_bar" />
</RelativeLayout>

Corrected and working xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <include
        android:id="@+id/tool_bar"
        layout="@layout/tool_bar" />
</RelativeLayout>

Solution 2:

layout="@layout/view_toolbar"

instead:

android:layout="@layout/view_toolbar

Solution 3:

In my case I added a layout with the correct attribute (layout="@layout/digits_layout"), but Android Studiokept throwing this annoying exception. I pressed File> Invalidate and restart, Build > Rebuild Project. Also removed <include> tag from XML. Only after that the exception disappeared. So I suppose only rebuild helps to avoid the problem if you already threw out the <include> tag.So, in a fragment a have a layout like:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"

    <include
        layout="@layout/digits_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />

    ...
</android.support.constraint.ConstraintLayout>

digits_layout also contains included views:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:baselineAligned="false"
    android:orientation="horizontal"
    >

    <include
        android:id="@+id/digit_1"
        layout="@layout/item_digit"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="25dp"
        android:layout_marginLeft="25dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_weight="1"
        />
    ...

I think that was the reason.I use Kotlin with Kotlin Android Extensions for importing resources like import kotlinx.android.synthetic.main.fragment_my.*, that simplifies accessing to views (no findViewById() needed). In my project I separated resources (drawables, layouts) by folders. Maybe it matters. Replacing <include> with <merge> as in solution didn’t help. Also accessing to any view inside this included layout made it null.

My own:
xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".HomeActivity">
    <include
        layout="@layout/top_actionbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</RelativeLayout>

xml:

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.appbar.AppBarLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

            <android.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_collapseMode="pin"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:titleTextColor="#ffffff"/>
<!--    pin 无论下面的页面怎么滑动始终顶部栏  /*androidx.appcompat.widget.Toolbar-->

</com.google.android.material.appbar.AppBarLayout>

solution:我的主要是删掉了注释//，ctr+/注释。起初尝试了很多的解决方法，添加/去掉android：都没用。我这应该就是注释问题