Failed to load AppCompat ActionBar with unknown er

Question

Below is my xml file. In preview there is two error'Failed to load AppCompat ActionBar with unknown error' & 'Failed to instaniate more than one class'. How ever am able to run the app.But the app crashes and in Logcat no errors are shown.

This is my preview screen shot

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 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:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">


    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="506dp" />

    <LinearLayout
        android:id="@+id/layout_main"
        android:orientation="vertical"
        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"
        android:weightSum="1"
        tools:context=".Activity.MainActivity">


    <LinearLayout
        android:id="@+id/main_layout"
        android:orientation="vertical"
        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"
        android:layout_weight="0.7"
        tools:context=".Activity.MainActivity">

        <!-- our tablayout to display tabs  -->
        <android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            app:tabMode="scrollable"
            app:tabSelectedTextColor="@color/colorBlack"
            app:tabTextColor="@color/colorWhite"
            android:background="@color/colorOran"
            android:minHeight="?attr/actionBarSize"
            />

        <!-- View pager to swipe views -->
        <android.support.v4.view.ViewPager
            android:id="@+id/pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

    </LinearLayout>

        <LinearLayout
            android:id="@+id/ll"
            android:layout_width="match_parent"
            android:layout_height="64dp"
            android:layout_alignParentBottom="true"
            android:background="#ffffff"
            android:orientation="horizontal"
            android:layout_weight="0.3"
            android:weightSum="4"
            tools:layout_editor_absoluteX="8dp"
            android:layout_marginBottom="8dp"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true">

            <ImageView
                android:id="@+id/btn_home"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:src="@drawable/ta_home_icon"
                android:background="@color/colorOran"
                android:layout_marginRight="1dp"
                android:scaleType="fitCenter"/>

            <ImageView
                android:id="@+id/btn_new"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:src="@drawable/ta_todaydeals_icon"
                android:background="@color/colorOran"
                android:layout_marginRight="1dp"
                android:scaleType="fitCenter"/>

            <ImageView
                android:id="@+id/btn_fav"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:src="@drawable/ta_fav_icon"
                android:background="@color/colorOran"
                android:layout_marginRight="1dp"
                android:scaleType="fitCenter"/>

            <ImageView
                android:id="@+id/btn_auth"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:src="@drawable/ta_franchie_icon"
                android:background="@color/colorOran"
                android:scaleType="fitCenter"
                android:layout_marginRight="1dp"
                />

        </LinearLayout>

    </LinearLayout>


    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />


</android.support.v4.widget.DrawerLayout>

Below is appbar_main

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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="com.jeyashri.kitchen.jeyashriskitchen.Activity.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">


        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@color/colorOran"
            app:popupTheme="@style/AppTheme.PopupOverlay">

            <ImageView
                android:id="@+id/app_logo"
                android:layout_width="80dp"
                android:layout_height="match_parent"
                android:src="@drawable/img"/>

            <ImageView
                android:id="@+id/btn_social"
                android:layout_width="75dp"
                android:layout_height="35dp"
                android:layout_marginRight="1dp"
                android:src="@drawable/share_icon" />

    </android.support.v7.widget.Toolbar>

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />


</android.support.design.widget.CoordinatorLayout>

Answer 1

in android 3.0.0 canary 6 you must change all 2.6.0 beta2 to beta1 (appcompat,design,supportvector)

Answer 2

Use this one:

implementation 'com.android.support:appcompat-v7:26.0.0-beta1'
implementation 'com.android.support:design:26.0.0-beta1'

instead of

implementation 'com.android.support:appcompat-v7:26.0.0-beta2'
implementation 'com.android.support:design:26.0.0-beta2'

In my case it removed the rendering problem.

Answer 3

Open preview mode

follow the below link to fix the issue

Fix - Rendering Problems The Following classes could not be found : android.support.v7.internal

goto appTheme ----> select Holo Theme ---> refresh

https://www.youtube.com/watch?v=4MxBnwpcUjA

Answer 4

Method 1:

Locate /res/values/styles.xml

Change

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

To

<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

Method 2:

Modify template file(locate: android-studio/plugins/android/lib/templates/gradle-projects/NewAndroidModule/root/res/values/styles.xml.ftl)

Change

backwardsCompatibility!true>Theme.AppCompat<#else><#if

To

backwardsCompatibility!true>Base.Theme.AppCompat<#else><#if

Watch Solution On YouTube

Answer 5

June 2018 Issue fixed by using a different appcompact version. Use these codes onto your project dependencies...

In build.gradle(Module: app) add this dependency

implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'

Happy Coding... :)

Answer 6

Try this:

Just change:

compile 'com.android.support:appcompat-v7:26.0.0-beta2'

to:

compile 'com.android.support:appcompat-v7:26.0.0-beta1'

Reference