android-studio-3.0 - 未找到类 "android.support.constraint.ConstraintLayout"

Question

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
implementation 'androidx.constraintlayout:constraintlayout:1.1.2'

testImplementation 'junit:junit:4.12'
//androidTestImplementation 'androidx.test:runner:1.1.0-beta01'
//androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-beta01'

implementation 'com.google.android.material:material:1.0.0-beta01'
implementation 'androidx.cardview:cardview:1.0.0-beta01'

我正在尝试使用 androidx 库。虽然我已经添加了“实现 'androidx.constraintlayout:constraintlayout:1.1.2'"我收到此错误。

Answer 1

检查您的 xml 并查看您是否使用 androidx.constraintlayout.widget.ConstraintLayout 。