Я не вижу нижнюю кнопку поддержки поддержки поддержки кнопок/android с поддержкой SupportMapFragment

Question

Я использую http://android-developers.blogspot.jp/2015/05/android-design-support-library.html с поддержкой SupportMapFragment и Button.

Почему я не могу увидеть кнопку на SupportMapFragment?

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/drawer_layout" 
    android:layout_height="match_parent" 
    android:layout_width="match_parent" 
    android:fitsSystemWindows="true"> 

    <include layout="@layout/include_list_viewpager"/> 

    <android.support.design.widget.NavigationView 
     android:id="@+id/nav_view" 
     android:layout_height="match_parent" 
     android:layout_width="wrap_content" 
     android:layout_gravity="start" 
     android:fitsSystemWindows="true" 
     app:headerLayout="@layout/nav_header" 
     app:menu="@menu/drawer_view"/> 

</android.support.v4.widget.DrawerLayout> 

map_fragment.xml с SupportMapFragment

<?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"> 

    <fragment xmlns:android="http://schemas.android.com/apk/res/android" 
     android:id="@+id/map" 
     class="com.google.android.gms.maps.SupportMapFragment" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

    <Button 
     android:id="@+id/start_button" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentBottom="true" 
     android:text="start" 

     /> 

</RelativeLayout> 

include_list_viewpager.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/main_content" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <android.support.design.widget.AppBarLayout 
     android:id="@+id/appbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:background="?attr/colorPrimary" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      app:layout_scrollFlags="scroll|enterAlways" /> 

     <android.support.design.widget.TabLayout 
      android:id="@+id/tabs" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" /> 

    </android.support.design.widget.AppBarLayout> 

    <android.support.v4.view.ViewPager 
     android:id="@+id/viewpager" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" 
     /> 

</android.support.design.widget.CoordinatorLayout> 

спасибо.

Answer 1

Я думаю, что проблема заключается в вашем файле map_fragment.xml с поддержкой SupportMapFragment. Попробуйте ниже.

<fragment xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/map" 
    class="com.google.android.gms.maps.SupportMapFragment" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/start_button"/> 
<Button 
    android:id="@+id/start_button" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:text="start" />