我正在尝试使用Androidx.该应用程序非常新,因此代码不多.我确实在android studio中使用了“Refactor to Androidx”选项.但在那之后的某个时候,它停止了工作.我不知道是什么让它停止工作.

我应该做些什么？

但它得到了这个错误

Error inflating class androidx.constraintlayout.widget.ConstraintLayout

主要活动

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        pick_image.setOnClickListener {
            toast("Pick image clicked")
        }

    }
}

XML

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/pick_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:text="Pick image"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

build.gradle(app)

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.alvarlagerlof.blurr"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

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

    // Androidx
    implementation 'androidx.core:core-ktx:1.0.0-alpha3'
    implementation 'androidx.appcompat:appcompat:1.0.0-alpha1'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.1'


    // Testing
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.0-alpha3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha3'
}

解决方法:

编辑2：自新版本以来,他们又回到了androidx.constraintlayout.widget.ConstraintLayout.
如果您正在使用约束布局版本1.1.1,请继续阅读

编辑：作为Arturo Mejia’s answer,只需按⇧⌘R或Ctrl Shift R即可

替换任何

androidx.constraintlayout.widget.ConstraintLayout

同

androidx.constraintlayout.ConstraintLayout

在使用Constraint Layout的所有XML文件中.

这是自约束布局版本v1.1.1以来的一个变化(在v1.1.0中,ConstraintLayout类仍在“.widget”包内)

旧的解决方法答案：

Change from

implementation 'androidx.constraintlayout:constraintlayout:1.1.1'

to

implementation 'androidx.constraintlayout:constraintlayout:1.1.0'

I tried to press Command + Click at ConstraintLayout in
androidx.constraintlayout.widget.ConstraintLayout from XML file to
show the original class but it doesn’t find any thing. After I edited
the constraint layout version to 1.1.0 then it’s there.