错误：无法解析“：app @ debugAndroidTest / compileClasspath”的依赖项：无法解析junit：junit：4.12

我创建了一个新的android项目,它在构建时显示错误@H_489_2@

我尝试了现有的答案@H_489_2@

> Failed to resolve: com.android.support:appcompat-v7 24.0.1
>我试图使Android studio无效并重新启动@H_489_2@

错误是@H_489_2@

我的gradle文件的依赖项部分@H_489_2@

 dependencies 
    {
       implementation 'androidx.appcompat:appcompat:1.0.2'
    testImplementation 'junit:junit:4.12'

    }

我不明白这是我的第一个项目.@H_489_2@

我的项目gradle是@H_489_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:3.4.1'

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

allprojects {
    repositories {
        jcenter()
        maven {
            url 'https://maven.google.com'
        }
    }
}

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

我的应用程式gradle是@H_489_2@

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.0"
    defaultConfig {
        applicationId "com.example.myapplication"
        minSdkVersion 28
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testinstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'),'proguard-rules.pro'
        }
    }
}
android
        {
            configurations.all
                    {
                        resolutionStrategy.force 'com.google.code.findbugs:jsr305:1.3.9'
                    }
        }

dependencies
        {
    implementation 'androidx.appcompat:appcompat:1.0.2'
    testImplementation 'junit:junit:4.12'


}