具有CoordinatorLayout和AppbarLayout的页脚闪烁

Question

我正在使用`implementation'androidx.constraintlayout：constraintlayout：1.1.3'

下面的布局是我的应用程序的根目录。单击BottomNavigation时，会将片段添加到FrameLayout @+id/fragment_container。每个片段都将其“标题”添加到AppBarLayout中。在以下情况下，其为CollapsingToolbarLayout。

我使用以下行为https://stackoverflow.com/a/35405095/5925091来偏移底部，但是当直接滚动CollapsingToolbarLayout时，它会闪烁。从RecyclerView中滚动时，一切正常。

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根布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:id="@+id/cl_coordinator"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/app_bar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:elevation="0dp" />

        <FrameLayout
            android:id="@+id/fragment_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="xyz.FixScrollingFooterBehavior" />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

    <com.aurelhubert.ahbottomnavigation.AHBottomNavigation
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom" />

</LinearLayout>

标题（CollapsingToolbarLayout）

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.appbar.CollapsingToolbarLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/collapsing_toolbar"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:collapsedTitleTextAppearance="@style/CollapsingToolbarTitleAppearance"
    app:contentScrim="?attr/colorPrimary"
    app:expandedTitleTextAppearance="@style/CollapsingToolbarTitleAppearance"
    app:layout_scrollFlags="scroll|exitUntilCollapsed|enterAlwaysCollapsed">


    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        // multiple views

    </androidx.constraintlayout.widget.ConstraintLayout>


    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:minHeight="?attr/actionBarSize"
        android:theme="@style/Theme.GuidelinesCompat.Toolbar"
        app:layout_collapseMode="pin"
        app:popupTheme="@style/Theme.GuidelinesCompat.Toolbar.PopUp" />


</com.google.android.material.appbar.CollapsingToolbarLayout>

自定义行为

public class FixScrollingFooterBehavior extends AppBarLayout.ScrollingViewBehavior {

    public FixScrollingFooterBehavior() {
        super();
    }

    public FixScrollingFooterBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
    }


    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
        final boolean result = super.onDependentViewChanged(parent, child, dependency);
        final int bottomPadding = calculateBottomPadding((AppBarLayout) dependency);
        final boolean paddingChanged = bottomPadding != child.getPaddingBottom();

        if (paddingChanged) {
            child.setPadding(
                    child.getPaddingLeft(),
                    child.getPaddingTop(),
                    child.getPaddingRight(),
                    bottomPadding);
            child.requestLayout();
        }
        return paddingChanged || result;
    }


    private int calculateBottomPadding(AppBarLayout dependency) {
        final int totalScrollRange = dependency.getTotalScrollRange();
        return totalScrollRange + dependency.getTop();
    }
}