The FlexbloxLayout tag is simply not working ?

[Aryanr64x]

• [x] 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

[vsd-codesode]

I could confirm that issue is valid in flexbox version 1.1.0. How could we be certain that it is issue with flex library or IDE itself?

[Aryanr64x]

@vsd-codesode This is because because when I launch the app in my android device it still does not shows anything there. Hence its not only an IDE problem

[thagikura]

Hi,

Thanks for the report.

The issue that nothing appeared is highly likely an issue with the Android Studio. If so, could you report the issue to the Android Studio issue tracker?

If the issue that nothing appeared on the phone is reproducible, it's an issue with the flexbox-layout library. But I couldn't reproduce it on my phone. Is the issue that nothing appeared on your phone still reproducible?

[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

[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.

[Ozaoujal]

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.

After many hours stucking in this issue, this one worked for me!