How to use Coordinatorlayout with Linearlayout?-CodePudding

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    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"
    tools:context=".activities.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <com.google.android.material.appbar.MaterialToolbar
            style="@style/Widget.MaterialComponents.Toolbar.Surface"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:elevation="4dp"
            app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
            app:title="@string/app_name" />

        <androidx.fragment.app.FragmentContainerView
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            app:defaultNavHost="true" />

        <com.google.android.material.bottomnavigation.BottomNavigationView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:labelVisibilityMode="unlabeled"
            app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
            app:menu="@menu/menu_bottom_navigation" />

    </LinearLayout>

</androidx.coordinatorlayout.widget.CoordinatorLayout>

This attribute app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior" does not work inside LinearLayout, I tried to put BottomNavigationView outside LinearLayout, and the attribute above worked but I want to put FragmentContainerView above BottomNavigationView and at the same time make the attribute above work. How can I solve the problem?

CodePudding user response：

Update your code like below:

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    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"
    tools:context=".activities.MainActivity">

    <com.google.android.material.appbar.AppBarLayout
      android:id="@ id/abl"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:theme="@style/AppTheme.AppBarOverlay">

        <com.google.android.material.appbar.MaterialToolbar
            style="@style/Widget.MaterialComponents.Toolbar.Surface"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:elevation="4dp"
            app:title="@string/app_name" />

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

    <androidx.fragment.app.FragmentContainerView
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        app:defaultNavHost="true" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:layout_gravity="bottom"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:labelVisibilityMode="unlabeled"
        app:layout_behavior="@string/hide_bottom_view_on_scroll_behavior"
        app:menu="@menu/menu_bottom_navigation" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>