The FlexbloxLayout tag is simply not working ?

• I have searched existing issues and confirmed this is not a duplicate

I install the Flexbox layout and typed the following code in android studio

    <com.google.android.flexbox.FlexboxLayout
      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"
      app:flexWrap="wrap"
      app:alignItems="stretch"
      app:alignContent="stretch" >

    <TextView
        android:id="@+id/textview1"
        android:layout_width="120dp"
        android:layout_height="80dp"
        app:layout_flexBasisPercent="50%"
        />

    <TextView
        android:id="@+id/textview2"
        android:layout_width="80dp"
        android:layout_height="80dp"
        app:layout_alignSelf="center"
        />

    <TextView
        android:id="@+id/textview3"
        android:layout_width="160dp"
        android:layout_height="80dp"
        app:layout_alignSelf="flex_end"
        />
    </com.google.android.flexbox.FlexboxLayout>

But the previwer is unable to display any thing on the screen . When I ran the app even then noting appeared on the phone (just like the previer). The previwer does gives an error though

java.lang.NoClassDefFoundError: android/view/View$OnUnhandledKeyEventListener at com.google.android.flexbox.FlexboxLayout.onLayout_Original(FlexboxLayout.java:564) at com.google.android.flexbox.FlexboxLayout.onLayout(FlexboxLayout.java) at android.view.View.layout_Original(View.java:19659) at android.view.View_Delegate.layout(View_Delegate.java:91) at android.view.View.layout(View.java:19645) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout_Original(View.java:19659) at android.view.View_Delegate.layout(View_Delegate.java:91) at android.view.View.layout(View.java:19645) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083) at android.view.View.layout_Original(View.java:19659) at android.view.View_Delegate.layout(View_Delegate.java:91) at android.view.View.layout(View.java:19645) at android.view.ViewGroup.layout(ViewGroup.java:6075) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:346) at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:384) at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:193) at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:544) at com.android.tools.idea.rendering.RenderTask.lambda$inflate$3(RenderTask.java:678) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ClassNotFoundException: android.view.View$OnUnhandledKeyEventListener at org.jetbrains.android.uipreview.ModuleClassLoader.load(ModuleClassLoader.java:180) at com.android.tools.idea.rendering.RenderClassLoader.findClass(RenderClassLoader.java:61) at org.jetbrains.android.uipreview.ModuleClassLoader.findClass(ModuleClassLoader.java:118) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.jetbrains.android.uipreview.ModuleClassLoader.loadClass(ModuleClassLoader.java:213) ... 26 more

I am also using the right version of the library

Version of the flexbox library

flexbox:1.0.0

[SmileHub]

Updated android studio tu 3.3, Migrated to android x, successfully compiled the project and launched and tested it. Then decided to try Flexbox and added dependency: implementation 'com.google.android:flexbox:1.1.0'

pasted in new fragment`s xml and it seems all worked out.

[Aryanr64x]

I ended up migrating to android x. It works there (version 1.1.0) . The error was in version 1.0.0 (Without android x). Also I was using android studio 3.2 and 3.3 (The current stable) … to which I have now migrated