按鈕不是線性佈局內可見

Question

我有這個vehicle_list_fragment_layout.xml：

<?xml version="1.0" encoding="utf-8"?> 
<!-- Layout per il fragment VehicleListFragment. --> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

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

    <Button 
     android:id="@+id/btnAddVehicle" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_weight="1" 
     android:text="+"/> 
</LinearLayout> 

它以這種方式使用我的VehicleListFragment：

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
{ 
    View rootView = inflater.inflate(R.layout.vehicle_list_fragment_layout, container, false); 
    btnStartActivity = (Button) rootView.findViewById(R.id.btnAddVehicle); 
    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView); 
    mLayoutManager = new LinearLayoutManager(getActivity()); 

    setRecyclerViewLayoutManager(LayoutManagerType.LINEAR_LAYOUT_MANAGER); 
    initAdapter(); 
    mRecyclerView.setAdapter(mAdapter); 
    setButtonClickListener(); 

    return rootView; 
} 

的問題是RecyclerView顯示正確，但我未顯示btnAddVehicle。

這是activity_vehicle_layout.xml的Activity佈局哪些主機我VehicleListFragment：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout 
    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" 
    tools:context="clyky.cartracker.activities.VehicleActivity"> 

    <FrameLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/vehicleContainer"> 
    </FrameLayout> 
</android.support.constraint.ConstraintLayout> 

我用vehicleContainer作爲容器我的片段。 在此先感謝！

編輯

這是我recycler_view_fragment_layout：

<?xml version="1.0" encoding="utf-8"?> 
<!-- Layout per un fragment che contiene una RecyclerView --> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <android.support.v7.widget.RecyclerView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:scrollbars="vertical" 
     android:id="@+id/recyclerView"> 
    </android.support.v7.widget.RecyclerView> 
</LinearLayout> 

Answer 1

試試這個。 Basicall添加weightsum到父視圖和layout_weight自己的孩子像我以如下的添加，

<?xml version="1.0" encoding="utf-8"?><!-- Layout per il fragment VehicleListFragment. --> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:orientation="vertical" 
    android:layout_height="match_parent" 
    android:weightSum="1"> 

    <android.support.v7.widget.RecyclerView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:scrollbars="vertical" 
     android:layout_weight=".8" 
     android:id="@+id/recyclerView"> 
    </android.support.v7.widget.RecyclerView> 

    <Button 
     android:id="@+id/btnAddVehicle" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_weight=".2" 
     android:text="+" /> 
</LinearLayout> 

需要添加定位於母公司以及顯示回收視圖和按鈕垂直

Answer 2

在vehicle_list_fragment_layout.xml試試這個：

<?xml version="1.0" encoding="utf-8"?> 
<!-- Layout per il fragment VehicleListFragment. --> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

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

    <Button 
     android:id="@+id/btnAddVehicle" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:text="+"/> 

</LinearLayout> 

和recycler_view_fragment_layout.xml：

<?xml version="1.0" encoding="utf-8"?> 
<!-- Layout per un fragment che contiene una RecyclerView --> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="0dp" 
    android:layout_weight="1" 
    android:orientation="vertical" 
    tools:layout_height="match_parent" 
> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/recyclerView" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:scrollbars="vertical"/> 

</LinearLayout>