android - android studio 3.2.1 中 compileSDK 版本 28 的 gradle 依赖项应该是什么

Question

Here is the gradle code. It is unable to sync everytime. I'm really stuck here. Please help me. Thank you in advance. The error is Failed to resolve: and then all the lines between the dependencies { }

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    buildToolsVersion "28.0.3"
    defaultConfig {
        applicationId "global.alyssum.charcha"
        minSdkVersion 21
        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 {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'androidx.appcompat:appcompat:1.0.0-alpha1'
    compile 'androidx.constraintlayout:constraintlayout:1.1.2'
    compile 'com.google.android.material:material:1.0.0-alpha1'
    testCompile 'junit:junit:4.12'
    androidTestCompile 'androidx.test:runner:1.1.0-alpha3'
    androidTestCompile 'androidx.test.espresso:espresso-core:3.1.0-alpha3'

}

Answer 1

顶级构建文件:

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'

        // 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
}

模块级构建文件:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "global.alyssum.charcha"
        minSdkVersion 21
        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'
        }
        staging {
            signingConfig signingConfigs.debug
        }
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.android.material:material:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}