how to make bottom app bar or bottom navigation bar like google home app?

问题

I want to make a layout like above. Can anyone help me how to do that? I have tried the new material bottom app bar. but I couldn't achieve this view.

回答1:

Finally got the solution. Just place bottomAppBar under your bottomNavigationView with transparent background. And add empty menu item to menu.xml to free space for the FAB.

XML:

<?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"
android:id="@+id/coordinator_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:fitsSystemWindows="false">



<com.google.android.material.bottomappbar.BottomAppBar
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/bottom_bar"
    android:clickable="false"
    app:fabAlignmentMode="center"
    android:layout_gravity="bottom"/>

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:clickable="false"
        android:layout_height="wrap_content"
        app:menu="@menu/bottom_menu" />
</FrameLayout>

<FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_anchor="@id/bottom_bar"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Also you need to add an empty item in your menu.xml like this:

<item
android:id="@+id/action_empty"
android:title=""
android:checkable="false"
android:checked="false"
app:showAsAction="always"
android:enabled="false"
>

回答2:

@Artur's solution is a huge kick in the right direction, although it needs more fine tuning as google's material components has evolved.

my solution's screenshot:

build.gradle's dependencies:

implementation 'com.google.android.material:material:1.1.0-alpha10'
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta2'

layout/activity_main.xml file:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".ui.main.MainActivity"
        android:background="@color/orange_500"
        >

        <!-- blah blah blah other content...   -->
        <!--         android:visibility="gone" -->

        <androidx.coordinatorlayout.widget.CoordinatorLayout
                android:id="@+id/coordinator_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:fitsSystemWindows="false"
                android:clickable="false"
                android:focusable="false"
                >


                <com.google.android.material.bottomappbar.BottomAppBar
                        android:id="@+id/bottom_bar"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_gravity="bottom"
                        android:background="@android:color/transparent"
                        android:clickable="false"
                        app:fabAlignmentMode="center"
                        app:contentInsetStart="0dp"
                        app:contentInsetStartWithNavigation="0dp"
                        >

                        <com.google.android.material.bottomnavigation.BottomNavigationView
                                android:background="@color/clear"
                                android:id="@+id/bottom_navigation"
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                app:menu="@menu/menu_bottom_navigation_main"
                                android:outlineAmbientShadowColor="@android:color/transparent"
                                android:outlineSpotShadowColor="@android:color/transparent"
                                />

                </com.google.android.material.bottomappbar.BottomAppBar>

                <com.google.android.material.floatingactionbutton.FloatingActionButton
                        android:id="@+id/fab"
                        style="@style/Widget.Design.FloatingActionButton"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        app:layout_anchor="@id/bottom_bar"
                        android:src="@drawable/ic_add_white_24dp"
                        android:tint="@color/white"
                        />
        </androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

menu/menu_bottom_navigation_main.xml file:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
            android:id="@+id/action_view_all_expenses"
            android:enabled="true"
            android:icon="@drawable/ic_list_black_24dp"
            android:title="View All"
            app:showAsAction="always" />


    <item
    android:enabled="false"
    android:title="Add Expense"
    app:showAsAction="always"
            android:checkable="false"
            android:checked="false"
            />


    <item

            android:id="@+id/action_view_dashboard"
            android:enabled="true"
            android:icon="@drawable/ic_dashboard_black_24dp"
            android:title="Dashboard"
            app:showAsAction="withText" />
</menu>

A few remarks:

1. I had to remove the FrameLayout as the middle-man, it didn't go well.

2. My main root is a ConstraintLayout. I only needed to add a coordinator layout for the bottom to behave well. notice that the coordinator's height is match_parent although it is only needed for the bottom app bar.

3. the bottom navigation view had to add android:outlineAmbientShadowColor and android:outlineSpotShadowColor as transparent and also transparent background, or devices running android q will have strange shadows painted on top of the bottom app bar.

4. the bottom app bar had to add app:contentInsetStart and app:contentInsetStartWithNavigation to be 0dp so that the navigation view won't get moved aside from the screen's start and look strange.

5. if you will use ConstraintLyaout as the root view, you can't constraint to the bottom navigation view. instaed you will need to constraint's bottom to bottom of parent, and add margin bottom like this: android:layout_marginBottom="@dimen/design_bottom_navigation_height"

回答3:

You also can use android.support.design.widget.TabLayout aligned at the bottom of the screen with four normal tabs with icons and one special tab in the middle of the other tabs with a customized view.

回答4:

You can find another solution here. @barenluth suggest to put a linear layout inside the bottom app bar and use it like navigation view:

<com.google.android.material.bottomappbar.BottomAppBar
    android:id="@+id/bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"
    android:gravity="center"
    app:layout_anchorGravity="start"
    app:hideOnScroll="true"
    app:fabAnimationMode="scale"
    app:fabAlignmentMode="center"
    app:backgroundTint="@color/colorPrimary">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="5"
        android:paddingEnd="16dp">
        <ImageButton
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            app:srcCompat="@drawable/ic_home_white_24dp"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:tint="@color/secondary_text"/>
        <ImageButton
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            app:srcCompat="@drawable/ic_map_black_24dp"
            android:background="?attr/selectableItemBackgroundBorderless"/>
        <ImageButton
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@android:color/transparent"/>
        <ImageButton
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            app:srcCompat="@drawable/ic_people_white_24dp"
            android:background="?attr/selectableItemBackgroundBorderless"/>
        <ImageButton
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            app:srcCompat="@drawable/ic_account_circle_24dp"
            android:background="?attr/selectableItemBackgroundBorderless"/>
    </LinearLayout>
</com.google.android.material.bottomappbar.BottomAppBar>

回答5:

If you using newest Material components with related themes and want to put some layout into BottomAppBar you have to override BottomAppBar style in your themes.xml to remove nav drawer icon space at start (left side)

<style name="AppTheme.BottomAppBar" parent="@style/Widget.MaterialComponents.BottomAppBar">
    <item name="contentInsetStart">0dp</item>
    <item name="contentInsetStartWithNavigation">0dp</item>
</style>

and apply in your layout

        <com.google.android.material.bottomappbar.BottomAppBar
        android:id="@+id/bar"
        style="@style/AppTheme.BottomAppBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        app:fabAlignmentMode="center">

        <com.google.android.material.bottomnavigation.BottomNavigationView
            android:id="@+id/nav_view"
            style="@style/Widget.MaterialComponents.BottomNavigationView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/bgDefault"
            app:labelVisibilityMode="unlabeled"
            app:menu="@menu/bottom_nav_menu" />

    </com.google.android.material.bottomappbar.BottomAppBar>

回答6:

Re'em remarks are important. And I have one addition:

Replace android:outlineAmbientShadowColor and android:outlineSpotShadowColor as transparent by single outlineProvider=none

回答7:

I think you are new to Android Studio aswell.

I recommend you to watch tutorials on youtube.

I searched for the one I used before which worked out for me Bottom Navigation View. It is pretty short and you get the idea quickly.

来源：https://stackoverflow.com/questions/52809778/how-to-make-bottom-app-bar-or-bottom-navigation-bar-like-google-home-app