javaandroidandroid-layoutandroid-coordinatorlayout
How to prevent bottom navigation from hiding when scrolling a CoordinatorLayout
I added a ListView with a collapsing toolbar at the top and bottom navigation at the bottom. My problem is that the bottom navigation keeps hiding when scrolling up. I want it to stay visible. I enabled nested scrolling programmatically. I tried many solutions, none of them worked.
This is my problem and my XML at the bottom:
This my main.xml
<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:id="@+id/_coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/_app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="@+id/collapse"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentScrim="#000000"
android:fitsSystemWindows="true"
app:layout_scrollFlags="scroll|enterAlways|snap">
<LinearLayout
android:id="@+id/header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp"
android:gravity="center_horizontal|center_vertical"
android:orientation="horizontal">
<TextView
android:id="@+id/textview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="collapsing toolbar"
android:textSize="20sp"
android:textColor="#FFFFFF"/>
</LinearLayout>
<androidx.appcompat.widget.Toolbar
android:id="@+id/_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay"/>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<ListView
android:id="@+id/listview1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:choiceMode="none"
android:layout_weight="1"/>
<LinearLayout
android:id="@+id/nav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp"
android:background="#1565C0"
android:gravity="center_horizontal|center_vertical"
android:orientation="horizontal">
<TextView
android:id="@+id/textview2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="bottom navigation"
android:textSize="20sp"
android:textColor="#FFFFFF"/>
</LinearLayout>
</LinearLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Solution
use a ConstraintLayout as a Root ViewGroup, and wrap in it the CoordinatorLayout, and the BottomNavigation
Then you can need to add some padding at the end of the ListView
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="@+id/_coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/_app_bar"
android:layout_width="match_parent"
android:theme="@style/AppTheme.AppBarOverlay"
android:layout_height="wrap_content">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="@+id/collapse"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:contentScrim="#000000"
app:layout_scrollFlags="scroll|enterAlways|snap">
<androidx.appcompat.widget.Toolbar
android:id="@+id/_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay"/>
<LinearLayout
android:id="@+id/header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal|center_vertical"
android:orientation="horizontal"
android:padding="8dp">
<TextView
android:id="@+id/textview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="collapsing toolbar"
android:textColor="#FFFFFF"
android:textSize="20sp" />
</LinearLayout>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<ListView
android:id="@+id/listview1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:choiceMode="none"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<LinearLayout
android:id="@+id/nav"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#1565C0"
android:gravity="center"
android:orientation="horizontal"
android:padding="8dp"
app:layout_constraintBottom_toBottomOf="parent">
<TextView
android:id="@+id/textview2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="bottom navigation"
android:textColor="#FFFFFF"
android:textSize="20sp" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
RelativeLayout version
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:id="@+id/_coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/_app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="@+id/collapse"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:contentScrim="#000000"
app:layout_scrollFlags="scroll|enterAlways|snap">
<androidx.appcompat.widget.Toolbar
android:id="@+id/_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
<LinearLayout
android:id="@+id/header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal|center_vertical"
android:orientation="horizontal"
android:padding="8dp">
<TextView
android:id="@+id/textview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="collapsing toolbar"
android:textColor="#FFFFFF"
android:textSize="20sp" />
</LinearLayout>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<ListView
android:id="@+id/listview1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:choiceMode="none"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<LinearLayout
android:id="@+id/nav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#1565C0"
android:gravity="center"
android:orientation="horizontal"
android:padding="8dp"
app:layout_constraintBottom_toBottomOf="parent">
<TextView
android:id="@+id/textview2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="bottom navigation"
android:textColor="#FFFFFF"
android:textSize="20sp" />
</LinearLayout>
</RelativeLayout>
Preview (replace ListView with NestedScrollView for simplicity)
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