I'm encountering an issue with a simple Android layout containing a Button
and a TextView
. Initially, the TextView
is hidden, and upon clicking the button, I set its visibility to VISIBLE
and populate it with text.
However, I'm facing a peculiar behavior: when I set a single-line text, the TextView
appears correctly upon clicking the button. But when I set a multi-line text, the TextView
doesn't show up on the first click; instead, I need to click the button twice to make it visible.
Here's a minimal example of my code:
main_activity.xml
<androidx.constraintlayout.motion.widget.MotionLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutDescription="@xml/activity_main_scene"
tools:context=".MainActivity">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.motion.widget.MotionLayout>
MainActivity.kt
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val button = findViewById<Button>(R.id.button)
val textView = findViewById<TextView>(R.id.textView)
button.setOnClickListener {
//textView.setText("Some dummy text") // it works
// not working
textView.setText("Some dummy text jtext text text text texte text texte txjkk ggg gggg ggggg gg trdff rrrrrr rrrr")
textView.visibility = View.VISIBLE
}
}
}
activity_main_scene.xml
<MotionScene
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:motion="http://schemas.android.com/apk/res-auto">
<Transition
motion:constraintSetEnd="@+id/end"
motion:constraintSetStart="@id/start"
motion:duration="1000">
<KeyFrameSet>
</KeyFrameSet>
</Transition>
<ConstraintSet android:id="@+id/start">
</ConstraintSet>
<ConstraintSet android:id="@+id/end">
</ConstraintSet>
</MotionScene>
TextView
visible, but it didn't help.textView.invalidate()
, but the problem remains.Any suggestions or solutions would be greatly appreciated. Thank you for your help!
I found a solution to the issue in this post. I fixed it by placing the TextView
inside the scene and added motion:visibilityMode="ignore"
like this:
<MotionScene
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:motion="http://schemas.android.com/apk/res-auto">
<Transition
motion:constraintSetEnd="@+id/end"
motion:constraintSetStart="@id/start"
motion:duration="1000">
<KeyFrameSet>
</KeyFrameSet>
</Transition>
<ConstraintSet android:id="@+id/start">
<Constraint
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:visibility="invisible"
motion:visibilityMode="ignore"
motion:layout_constraintBottom_toBottomOf="parent"
motion:layout_constraintEnd_toEndOf="parent"
motion:layout_constraintStart_toStartOf="parent" />
</ConstraintSet>
<ConstraintSet android:id="@+id/end">
</ConstraintSet>
</MotionScene>