LayoutTransition同时消失和更改

Question

我在这里有这个自定义的“底部操作栏”：https : //youtu.be/TPi5jtcs2wE，它在某些类型的网页（例如，文章/非文章）中出现和消失。我将最外面的设置为LinearLayout，animateLayoutTransition并制作了另一个LayoutTransition对象，但是我希望条形图在Web视图调整其高度的同时消失。需要明确的是，条形图（relativeLayout）设置为，View.GONE并且由于条形图消失了，因此webView应该扩展为匹配父级（由于layout_weight），但是两者不能同时进行。我尝试更改LayoutTransition.setDuration()和.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的配置：

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"/>

我虽然LayoutTransition.CHANGING可以使动画工作，但没有。如何获取webView的高度变化并同时移除钢筋？尽管设置了持续时间和启动延迟，但仍无法正常工作。我认为问题是CHANGING必须在之后发生，View.GONE因为视图消失后需要知道高度。要么不是CHANGING动画，要么。

Answer 1

我想到了。结果我需要 CHANGE_APPEARING 和 CHANGE_DISAPPEARING 来使其更平滑，而不是 CHANGING。它并不完美，但现在两个动画同时发生。我尝试了实际的顶部操作栏的 hide()/show() 函数，我认为这是正常的。

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);

这会产生一个问题，即 webview 在新网页上保持滚动位置，这是错误的（应该位于新页面的页面顶部）。我通过将 webview 包含在 LinearLayout 中来修复它。

<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"...