android - ConstraintLayout intermittent layout failure -


constraintlayout intermittently fails layout correctly when view set gone visible shortly after activity resumed:

<android.support.constraint.constraintlayout     android:id="@+id/constraint_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     app:layout_behavior="@string/appbar_scrolling_view_behavior">      <textview         android:id="@+id/text1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         app:layout_constraintleft_toleftof="parent"         app:layout_constrainttop_totopof="parent"/>      <textview         android:id="@+id/text2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         app:layout_constraintleft_torightof="@id/text1"         app:layout_constrainttop_totopof="parent"/> </android.support.constraint.constraintlayout>    override fun onresume() {         super.onresume()          text1.text = ""         text1.visibility = view.gone          text2.text = ""         text2.visibility = view.gone          text1.postdelayed({                     text1.text = "hello"                     text1.visibility = view.visible                      text2.text = "world"                     text2.visibility = view.visible                 }, 100         )     }

full source code here

instrumenting textview class reveals textview instances measured correctly width set 0 when laid out.

i wonder if constraintlayout linearsystem non-deterministic. there maps iterated on iteration order undefined? (i've seen cassowary)

i'm looking statement in github page:

constraintlayout intermittently fails layout correctly when view set gone visible shortly after activity resumed

i've checked out project , changed 100ms 1000ms. here's output:

enter image description here

it seems me, expect moment perform textview.setvisibility(view.gone) expect view not visible. that's not way android works. merely posting event messagequeue handled later looper, , 100ms not enough human eye see changes happening.


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