LayoutTransition disappears and changes at the same time

Question

I have this usual “bottom action bar” here: https://youtu.be/TPi5jtcs2wE that appears and disappears with certain types of web pages (e.g. article / not article). I set the external LinearLayoutusing animateLayoutTransitionand created another object LayoutTransition, but I want the panel to disappear at the same time as the webview adjusts its height. To be clear, the bar (relativeLayout) is set to View.GONE, and the webView needs to expand to fit the parent (due to layout_weight) as the strip is skipped, but it does not work at the same time. I tried to change LayoutTransition.setDuration()and .setStartDelay().

ArticleActivity xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:id="@+id/container_article"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="app.morningsignout.com.morningsignoff.ArticleActivity"
    tools:ignore="MergeRootFrame"
    android:background="@android:color/white"
    android:animateLayoutChanges="true">
    <app.com.morningsignout.morningsignout.CustomWebView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:id="@+id/webView_article"
        android:layout_gravity="center"
        android:layout_weight="9" />
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="?android:attr/actionBarSize"
        android:layout_weight="0"

LayoutTransition Configuration:

LinearLayout container = (LinearLayout) findViewById(R.id.container_article);
LayoutTransition customTransition = new LayoutTransition();
customTransition.enableTransitionType(LayoutTransition.CHANGING);
customTransition.disableTransitionType(LayoutTransition.CHANGE_APPEARING);
customTransition.disableTransitionType(LayoutTransition.CHANGE_DISAPPEARING);
customTransition.setAnimator(LayoutTransition.APPEARING, showArticleBar);
customTransition.setAnimator(LayoutTransition.DISAPPEARING, hideArticleBar);
customTransition.setStartDelay(LayoutTransition.APPEARING, 0);
customTransition.setStartDelay(LayoutTransition.DISAPPEARING, 0);
customTransition.setStartDelay(LayoutTransition.CHANGING, 0);
customTransition.setDuration(LayoutTransition.APPEARING, showArticleBar.getDuration());
customTransition.setDuration(LayoutTransition.DISAPPEARING, hideArticleBar.getDuration());
customTransition.setDuration(LayoutTransition.APPEARING, showArticleBar.getDuration());

container.setLayoutTransition(customTransition);

hide_action_bar.xml:

<?xml version="1.0" encoding="utf-8"?>
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:propertyName="translationY"
    android:duration="300"
    android:valueFrom="0"
    android:valueTo="?android:attr/actionBarSize"/>

show_action_bar.xml:

<?xml version="1.0" encoding="utf-8"?>
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:propertyName="translationY"
    android:duration="300"
    android:valueFrom="?android:attr/actionBarSize"
    android:valueTo="0"/>

LayoutTransition.CHANGING , . webView ? , . , , CHANGING View.GONE - . , CHANGING.

Answer 1

. , CHANGE_APPEARING CHANGE_DISAPPEARING, , . , . ()/show(), , .

LinearLayout container = (LinearLayout) findViewById(R.id.container_article);
LayoutTransition customTransition = new LayoutTransition();
// customTransition.enableTransitionType(LayoutTransition.CHANGING);
// customTransition.disableTransitionType(LayoutTransition.CHANGE_APPEARING);
// customTransition.disableTransitionType(LayoutTransition.CHANGE_DISAPPEARING);
customTransition.setAnimator(LayoutTransition.APPEARING, showArticleBar);
customTransition.setAnimator(LayoutTransition.DISAPPEARING, hideArticleBar);
customTransition.setStartDelay(LayoutTransition.APPEARING, 0);
customTransition.setStartDelay(LayoutTransition.DISAPPEARING, 0);
customTransition.setStartDelay(LayoutTransition.CHANGE_APPEARING, 0);
customTransition.setStartDelay(LayoutTransition.CHANGE_DISAPPEARING, 0);
// customTransition.setStartDelay(LayoutTransition.CHANGING, 0);
customTransition.setDuration(LayoutTransition.APPEARING, showArticleBar.getDuration());
customTransition.setDuration(LayoutTransition.DISAPPEARING, hideArticleBar.getDuration());
customTransition.setDuration(LayoutTransition.CHANGE_APPEARING, showArticleBar.getDuration());
customTransition.setDuration(LayoutTransition.CHANGE_DISAPPEARING, hideArticleBar.getDuration());
// customTransition.setDuration(LayoutTransition.APPEARING, showArticleBar.getDuration());

container.setLayoutTransition(customTransition);

, - scrollY, -, ( ). , webview linearLayout.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:id="@+id/container_article"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="app.morningsignout.com.morningsignoff.ArticleActivity"
    tools:ignore="MergeRootFrame"
    android:background="@android:color/transparent"
    android:animateLayoutChanges="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="9">

        <app.com.morningsignout.morningsignout.CustomWebView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/webView_article"
            android:layout_gravity="center" />
    </LinearLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="?android:attr/actionBarSize"
        android:layout_weight="0"...