每次我的应用程序崩溃时，因为它在类路径中找不到 Landroidx/constraintlayout/widget/R$styleable 。我尝试重建，使缓存无效，但它总是在运行时给我同样的错误。
我尝试了 1.1.2 和 1.1.3 两个版本。有趣的是：当使用 1.1.3 androidX Jetifier 时，只会强制使用 1.1.2，正如您从 gradle 报告中看到的那样
Caused by: android.view.InflateException: Binary XML file line #2: Binary XML file line #2: Error inflating class androidx.constraintlayout.widget.ConstraintLayout
Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class androidx.constraintlayout.widget.ConstraintLayout
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.view.LayoutInflater.createView(LayoutInflater.java:651)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:734)
at android.view.LayoutInflater.inflate(LayoutInflater.java:496)
at android.view.LayoutInflater.inflate(LayoutInflater.java:427)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:141)
at com.github.sharetaxi.LoginActivity.onCreate(LoginActivity.kt:24)
at android.app.Activity.performCreate(Activity.java:7050)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2809)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2931)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1620)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:6701)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/constraintlayout/widget/R$styleable;
at androidx.constraintlayout.widget.ConstraintLayout.init(ConstraintLayout.java:590)
at androidx.constraintlayout.widget.ConstraintLayout.<init>(ConstraintLayout.java:567)
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:334)
at android.view.LayoutInflater.createView(LayoutInflater.java:651)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:734)
at android.view.LayoutInflater.inflate(LayoutInflater.java:496)
at android.view.LayoutInflater.inflate(LayoutInflater.java:427)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:141)
at com.github.sharetaxi.LoginActivity.onCreate(LoginActivity.kt:24)
at android.app.Activity.performCreate(Activity.java:7050)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2809)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2931)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1620)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:6701)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:246)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)
Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.constraintlayout.widget.R$styleable" on path: DexPathList
我在用着安卓工作室3.3带有新的 android gradle 插件。在我的 gradle.properties 中，我启用了 jetifier：
android.useAndroidX=true
android.enableJetifier=true
依赖关系解决如下：
> Task :app:dependencyInsight
androidx.constraintlayout:constraintlayout:1.1.2
variant "default" [
org.gradle.status = release (not requested)
Requested attributes not found in the selected variant:
com.android.build.api.attributes.BuildTypeAttr = debug
org.gradle.usage = java-api
com.android.build.gradle.internal.dependency.AndroidTypeAttr = Aar
org.jetbrains.kotlin.platform.type = androidJvm
]
Selection reasons:
- Was requested
- Selected by rule : ENABLE_JETIFIER is enabled
- By constraint : debugRuntimeClasspath uses version 1.1.2
com.android.support.constraint:constraint-layout:1.1.3 -> androidx.constraintlayout:constraintlayout:1.1.2
+--- debugCompileClasspath
\--- project :general
\--- debugCompileClasspath
(*) - dependencies omitted (listed previously)
A web-based, searchable dependency report is available by adding the --scan option.
在 xml 中，它看起来如下：
<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"
android:background="@drawable/login_bg"
android:orientation="vertical">
...
</androidx.constraintlayout.widget.ConstraintLayout>
UPDATE:
最后我不得不使用 ConstraintLayout 2.0 alpha 版本，因为没有找到其他解决方案
