将 Android studio 更新到 3.1.2 后，我收到“无法加载 AppCompat ActionBar 并出现未知错误." [英] After Updating Android studio to 3.1.2 , I get "Failed to load AppCompat ActionBar with unknown error. "

问题描述

我尝试在 stackoverflow 上寻找其他类似的问题，他们建议我们使用buildToolsVersion"的 changw 版本，但我在我的 gradle 文件中没有看到这样的词.

I tried looking other similar questions on stackoverflow, they advice us to changw version of "buildToolsVersion" but I dont see word like that in my gradle file.

我的 Gradle 文件(项目):-

My Gradle File (PROJECT):-

buildscript {

repositories {
    google()
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.1.2'


    // 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
}

我的 build.gradle (Module:app):这是我的第二个 gradle 文件

My build.gradle (Module:app): This the my second gradle file

     apply plugin: 'com.android.application'

 android {
 compileSdkVersion 28
 defaultConfig {
    applicationId "com.example.dhruv.testhello"
    minSdkVersion 15
    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.constraint:constraint-layout:1.1.1'
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'
 }

推荐答案

我遇到了同样的问题.我搜索了这么多，我终于发现 appcompat-v7:28.0.0-alpha3 在 Android Studio 的设计视图"部分存在一些错误.

I had the same problem. I searched so much and I finally found that appcompat-v7:28.0.0-alpha3 has some bug with "Design View" part of Android Studio.

所以我建议将 com.android.support:appcompat-v7:28.0.0-alpha3 改为 com.android.support:appcompat-v7:28.0.0-alpha1 version 然后点击 File -> Invalidate Caches/Restart.沃拉一切正常.

So I suggest to change com.android.support:appcompat-v7:28.0.0-alpha3 to com.android.support:appcompat-v7:28.0.0-alpha1 version and then click File -> Invalidate Caches / Restart. Volla everything is OK.

当然，您应该可以上网下载com.android.support:appcompat-v7:28.0.0-alpha1

Of course you should have internet access to download com.android.support:appcompat-v7:28.0.0-alpha1

这篇关于将 Android studio 更新到 3.1.2 后，我收到“无法加载 AppCompat ActionBar 并出现未知错误."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！