Android：如何将listView与自定义actionBar的底部对齐？

Question

I am following instructions here to make the actionBar "float" on top of an activity's contents so that my background image extends from top edge of screen instead of under the actionBar . However, now I need to align my listView to the bottom of the actionBar because match_parent now aligns the listView to the top edge.

Is there a way to achieve that in xml only? What would the id of the actionBar be so I can set layout_below ?

I'm sure I can get/estimate the height of the actionBar in code to set the top margin of the listView accordingly but I'm hoping for a more elegant solution. Thanks

The listView activity xml:

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_users"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:srcCompat="@drawable/img_people_512"
        android:id="@+id/usersImageView"
        android:alpha="0.55"
        android:contentDescription="@string/backgroundImage"
        android:scaleType="centerCrop" />

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/userListView"
         />
</RelativeLayout>

the custom actionBar layout xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/mainActionBar"
    android:gravity="center">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/mainActionBarSpacer"
        android:text="@string/mainActionBarSpacer"
        android:textColor="@color/colourTransparent"
        android:textSize="35sp"
        android:fontFamily="cursive"
        android:onClick="onClick" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_toRightOf="@+id/mainActionBarSpacer"
        android:layout_toEndOf="@+id/mainActionBarSpacer"
        android:gravity="center"
        android:id="@+id/mainActionBarTitle"
        android:text="@string/app_name"
        android:textColor="@color/colourActionBarText"
        android:textSize="35sp"
        android:fontFamily="cursive"
        android:onClick="onClick" />

</RelativeLayout>

Answer 1

只需将layout_marginTop添加到您的列表视图

android:layout_marginTop="?actionBarSize"