为什么自从我更新了Android Studio之后，我就有无法修复的问题？

Question

在大量无效缓存、重新启动和重新构建项目后，错误消失了，它运行良好，但当我关闭Android Studio并再次打开它时，错误又出现了。

在同步Gradle文件时也会出现这个错误：

错误：无法解析“:app@debug/compileClasspath”的依赖项：无法解析com.android.support:support-v4:22.+.显示受影响模块得详细信息：应用程序

// 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:3.3.2'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
    classpath 'com.google.gms:google-services:4.2.0'
    }
}

allprojects {
repositories {
    google()
    jcenter()
    maven { url 'https://www.jitpack.io' }
    }
}

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

apply plugin: 'com.android.application'

android {
compileSdkVersion 28
defaultConfig {
    applicationId "com.app.myapp"
    minSdkVersion 19
    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'
implementation 'com.google.android.gms:play-services-auth:16.0.1'
implementation 'com.google.firebase:firebase-messaging:17.5.0'
implementation 'com.google.firebase:firebase-core:16.0.8'
implementation 'com.google.firebase:firebase-auth:16.2.0'
implementation 'org.nanohttpd:nanohttpd:2.2.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.google.firebase:firebase-database:16.1.0'
implementation 'com.google.firebase:firebase-ml-vision:19.0.3'
implementation 'com.google.firebase:firebase-ml-vision-image-label-model:17.0.2'
implementation 'com.google.code.gson:gson:2.8.2'
implementation 'com.melnykov:floatingactionbutton:1.3.0'
implementation 'com.github.vajro:MaterialDesignLibrary:1.6'
implementation 'com.github.devendroid:SquareMenu:1.0.0'
implementation 'org.aviran.cookiebar2:cookiebar2:1.1.1'
//implementation 'com.github.navasmdc:MaterialDesign:1.5@aar' // this was the reason for duplicated value error
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'
}

apply plugin: 'com.google.gms.google-services'

我不明白出了什么问题。如果有任何帮助，我将不胜感激。

Answer 1

我也面临同样的错误，当我迁移到更新版本的Android Studio相当长的时间后。该错误可能是由于较新版本的android studio中的一些错误导致它无法构建非androidX迁移的项目。

我只是有一天随随便便地迁移到androidX，这个问题就神奇地被解决了。我也提交了一个类似的bug与您的，也声明这导致了问题的修复。

迁移到AndroidX：