工具栏未在Android Studio预览中显示

多巴格纳

Android工具栏未在android studio中显示,但已显示在设备上。我跟踪了很多主题,但是没有具体的解决方案。我在android上创建了一个新项目,但始终没有显示,也没有显示我的旧项目。

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设备

我也得到那些错误

渲染问题

无法加载具有未知错误的AppCompat ActionBar。提示:尝试刷新布局。

无法实例化一个或多个类

The following classes could not be instantiated: - android.support.v7.widget.ActionBarContainer (Open Class, Show Exception, Clear Cache) - android.support.v7.widget.ActionBarContextView (Open Class, Show Exception, Clear Cache) - android.support.v7.app.WindowDecorActionBar (Open Class, Show Exception, Clear Cache) Tip: Use View.isInEditMode() in your custom views to skip code or show sample data when shown in the IDE.

But those problems deosn't show when I add "Base." inside to style apptheme.

What did I so far

  1. Someone says it's about "com.android.support:appcompat-v7:28.0.0" So use "com.android.support:appcompat-v7:28.0.0-alpha1" but it's didn't work.Also I tried with alpha3.

  2. I change apptheme on style.xml I tried "NoActionBar","Dark.ActionBar" and so many others.But nothing change.

  3. 清除缓存,但是没有用。

  4. 我在样式.xml(应用程序)中添加“ .Base”。

主要活动

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


</android.support.constraint.ConstraintLayout>

摇篮

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.test.parala"
        minSdkVersion 17
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support:cardview-v7:28.0.0'
    implementation 'com.android.support:customtabs:28.0.0'
    implementation 'com.android.support:support-v4:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

摇篮2

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

表现

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test.parala">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

风格

<!-- Base application theme. -->
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:windowActionBar">false</item>
    <item name="android:windowNoTitle">true</item>
</style>

<style name="koko" parent="ThemeOverlay.AppCompat.Dark.ActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:windowActionBar">true</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:actionBarSize">40dp</item>
</style>

多巴格纳

这可能不是一个完全正确的答案,但是在其他情况下都太实用了。降落在v27上,这样工具栏就会出现在布局管理器上,并在发布项目之前再次升级到v28。

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