无法在Android Studio中加载未知错误的AppCompat ActionBar [英] Failed to load AppCompat ActionBar with unknown error in android studio

问题描述

下面是我的xml文件.在预览中，有两个错误无法加载未知错误的AppCompat ActionBar"和& 未能实例化一个以上的班级".如何运行该应用程序.但是该应用程序崩溃了，并且在Logcat中未显示任何错误.

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.

这是我的预览屏幕截图

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>

下面是appbar_main

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>

推荐答案

此问题的解决方案取决于您使用的Android支持库的版本:

The solution to this problem depends on the version of the Android support library you're using:

此android支持库版本存在导致上述问题的错误

This android support library version has a bug causing the mentioned problem

在您的Gradle构建文件中使用:

In your Gradle build file use:

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

具有:

buildToolsVersion '26.0.0' 

和

classpath 'com.android.tools.build:gradle:3.0.0-alpha8'

现在一切正常.

这些新版本似乎又遇到了类似的困难.

These new versions seem to suffer from similar difficulties again.

在您的res/values/styles.xml中，修改AppTheme的样式

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

到

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

(请注意添加的Base.)

或者降级库，直到问题解决:

Or alternatively downgrade the library until the problem is fixed:

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

这篇关于无法在Android Studio中加载未知错误的AppCompat ActionBar的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！