在地图片段顶部的浮动行动按钮

Question

我想在地图片段顶部放置浮动操作按钮.我的地图片段完全填满整个屏幕.当我放置一个浮动动作按钮时它不会出现在地图片段的顶部请参考附图:

请在此处找到布局代码

<?xml version="1.0" encoding="utf-8"?>

<ScrollView 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"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillViewport="true">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"

        android:orientation="vertical"
        android:weightSum="1">


        <android.support.v7.widget.CardView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/margin_small"
            >

            <fragment
                android:id="@+id/autocomplete_fragment"
                android:name="com.google.android.gms.location.places.ui.PlaceAutocompleteFragment"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                />
            <!--<ImageView
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:src="@drawable/bell32"
                android:visibility="invisible"
                />
            <android.support.v7.widget.SwitchCompat
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:id="@+id/alarm_on_switch"
                android:layout_gravity="right|top"
                android:layout_marginRight="@dimen/margin_small"
                android:drawableLeft="@drawable/bell32"
                />-->

        </android.support.v7.widget.CardView>
        <fragment xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:tools="http://schemas.android.com/tools"
            android:id="@+id/map"
            android:name="com.google.android.gms.maps.SupportMapFragment"
            android:layout_width="match_parent"
            tools:context="reminder.locrem.com.locationreminder.MapsActivity"
            android:layout_height="match_parent" />

        <android.support.design.widget.FloatingActionButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="top|right"
            android:layout_margin="16dp"
            android:src="@drawable/done"
            app:layout_anchorGravity="bottom|right|end"
            app:elevation="4dp" />

    </LinearLayout>

</ScrollView>

Answer 1

您可以使用FrameLayout来实现您的需求.

    <?xml version="1.0" encoding="utf-8"?>
<ScrollView 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"
    android:fillViewport="true">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:weightSum="1">
        <android.support.v7.widget.CardView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/margin_small">
            <fragment
                android:id="@+id/autocomplete_fragment"
                android:name="com.google.android.gms.location.places.ui.PlaceAutocompleteFragment"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>

        </android.support.v7.widget.CardView>
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <fragment
                android:id="@+id/map"
                android:name="com.google.android.gms.maps.SupportMapFragment"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:context="reminder.locrem.com.locationreminder.MapsActivity" />

            <android.support.design.widget.FloatingActionButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="top|right"
                android:layout_margin="16dp"
                android:src="@drawable/done"
                app:elevation="4dp"
                app:layout_anchorGravity="bottom|right|end" />
        </FrameLayout>

    </LinearLayout>
</ScrollView>