使用RecyclerView

Question

我有RecyclerView和Button。按钮来自recyclerView。我想将按钮放在屏幕的屏幕底部中央。这不应该在任何设备中改变。因为在某些设备中按钮会消失。

我的Xml。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#33DADADA"
    android:fitsSystemWindows="true"
    android:gravity="center_horizontal"
    android:orientation="vertical">

    <include
        android:id="@+id/app_bar"
        layout="@layout/app_toolbar"></include>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="#4dabf5"
        android:gravity="center"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Distribution  Channel  "
            android:textSize="18sp" />

        <Spinner
            android:id="@+id/selectDistribChannel"
            android:layout_width="150dp"
            android:layout_height="wrap_content"></Spinner>

    </LinearLayout>

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView"
        android:layout_width="320dp"
        android:layout_height="35dp"
        android:layout_marginBottom="8dp"
        android:layout_marginTop="8dp"
        android:background="@drawable/rounded_edittext"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:gravity="center"
        android:hint="Search Products"
        android:singleLine="true" />


    <android.support.v7.widget.RecyclerView
        android:id="@+id/selectedItemRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="350dp"
        android:background="#33DADADA"
        android:padding="5dp">

    </android.support.v7.widget.RecyclerView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center|bottom">

        <Button
            android:id="@+id/bAdd"
            android:layout_width="250dp"
            android:layout_height="48dp"
            android:text="Send"
            android:textColor="@color/btn_login" />

    </LinearLayout>


</LinearLayout>

Answer 1

试试这个（由Relativelayout取代） -

 <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <Button
            android:id="@+id/bAdd"
            android:layout_width="250dp"
            android:layout_height="48dp"
            android:layout_alignParentBottom="true"
            android:text="Send"
            android:textColor="@color/btn_login" />

    </RelativeLayout>

让我知道这是否有效

Answer 2

   <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

  <android.support.v7.widget.RecyclerView
    android:id="@+id/selectedItemRecyclerView"
    android:layout_above="@id/button"
    android:layout_weight=1
    android:layout_width="match_parent"
    android:layout_height="350dp"
    android:background="#33DADADA"
    android:padding="5dp">

  </android.support.v7.widget.RecyclerView>

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_gravity="center"
        android:layout_alignParentBottom="true"
        android:text="write your text"
        android:textColor="@color/colorPrimary" />

</RelativeLayout>