fix origin RecyclerView$LayoutParams cast to com.google.android.flexb…

[LuckyJayce]

…ox.FlexItem error

java.lang.ClassCastException: android.support.v7.widget.RecyclerView$LayoutParams cannot be cast to com.google.android.flexbox.FlexItem

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

:memo: Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here (e.g. I signed it!) and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

[thagikura]

Thanks for the PR. Is it possible to add a test for this case?

[LuckyJayce]

has origin LayoutParams

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FlexItemViewHolder {
    var textView = TextView(parent.context);
    textView.setPadding(20, 20, 20, 20)
    textView.id = R.id.textview

    var f = FrameLayout(parent.context)
    f.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
    f.addView(textView)
    return FlexItemViewHolder(f)
} 

or

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FlexItemViewHolder {
    var textView = TextView(parent.context);
    textView.setPadding(20, 20, 20, 20)
    textView.id = R.id.textview

    var f = FrameLayout(parent.context)
    f.layoutParams = FlexboxLayoutManager.LayoutParams(FlexboxLayoutManager.LayoutParams.WRAP_CONTENT, FlexboxLayoutManager.LayoutParams.WRAP_CONTENT)
    f.addView(textView)
    return FlexItemViewHolder(f)
}

[thagikura]

Oh sorry I wanted to say is it possible to add test code to FlexboxLayoutManagerTest?

Also could you accept the CLA?

[thagikura]

I checked your PR in my local, looks like the fix is not enough because the original class's (e.g. FrameLayout) measure is called in FlexboxHelper. And it expects the original class's LayoutParams (FrameLayout.LayoutParams).

Example log.

java.lang.ClassCastException: com.google.android.flexbox.FlexboxLayoutManager$LayoutParams cannot be cast to android.widget.FrameLayout$LayoutParams
at android.widget.FrameLayout.onMeasure(FrameLayout.java:186)
at android.view.View.measure(View.java:22071)
at com.google.android.flexbox.FlexboxHelper.calculateFlexLines(FlexboxHelper.java:470)
at com.google.android.flexbox.FlexboxHelper.calculateHorizontalFlexLines(FlexboxHelper.java:244)
at com.google.android.flexbox.FlexboxLayoutManager.updateFlexLines(FlexboxLayoutManager.java:958)
at com.google.android.flexbox.FlexboxLayoutManager.onLayoutChildren(FlexboxLayoutManager.java:734)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3924)
at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3641)
at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4194)
at android.view.View.layout(View.java:19659)
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(View.java:19659)
at android.view.ViewGroup.layout(ViewGroup.java:6075)
at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:498)
at android.view.View.layout(View.java:19659)
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 com.android.internal.policy.DecorView.onLayout(DecorView.java:761)
at android.view.View.layout(View.java:19659)
at android.view.ViewGroup.layout(ViewGroup.java:6075)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2496)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2212)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1392)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6752)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
at android.view.Choreographer.doCallbacks(Choreographer.java:723)
at android.view.Choreographer.doFrame(Choreographer.java:658)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)