对准的LinearLayout低于RecyclerView [英] Aligning a RecyclerView below a LinearLayout

问题描述

我有一个名为页脚我希望把我下面的 RecyclerView （新类型列表的API引入21）的线性布局。

I have a linear layout called "footer" I want to place below my RecyclerView (a new type of list introduced in API 21).

1. 的 recyclerview 可能会希望有一个match_parent高度有效地使用内存（避免不必要的计算） 。


2. 我不应该在 recyclerview 第一，因为那会占用整个屏幕和页脚不会是可见的。


3. 因为 recyclerview 排第二的的LinearLayout 不应该有一个match_parent 的高度，因为那么 recyclerview 不会被看到，而我不需要页脚反正伸展。

1. The recyclerview will probably want to have a "match_parent" height to efficiently use memory (avoid unecessary calculation).
2. I shouldn't have the recyclerview first because then it will take up the whole screen and the footer wont be visible.
3. Since the recyclerview comes second the linearlayout shouldn't have a "match_parent" height, because then the recyclerview won't be seen, and I don't need the footer to stretch anyways.

所以我有的LinearLayout 页脚，高度先在我的根 RelativeLayout的，那么 recyclerview 将match_parent，和上面的页脚指定

So I have the linearlayout "footer", a height first in my root relativelayout, then the recyclerview will be "match_parent", and specified above the "footer":

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">

<LinearLayout
    android:id="@+id/footer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <ImageView
        android:id="@+id/addTaskImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end"
        android:src="@drawable/ic_edit"
        android:visibility="visible" />

    <RelativeLayout
        android:id="@+id/addTaskRL"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="gone">

        <EditText
            android:id="@+id/taskET"
            android:layout_width="match_parent"
            android:layout_height="150sp"
            android:background="@color/White">
        </EditText>

        <RelativeLayout
            android:id="@+id/paletteRed"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_below="@id/taskET"
            android:layout_marginLeft="50dp"
            android:layout_marginTop="10dp"
            android:background="@color/Red" />

        <RelativeLayout
            android:id="@+id/paletteOrange"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_below="@id/taskET"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_toRightOf="@id/paletteRed"
            android:background="@color/Orange" />

        <RelativeLayout
            android:id="@+id/paletteGreen"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_below="@id/taskET"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_toRightOf="@id/paletteOrange"
            android:background="@color/Green" />

        <RelativeLayout
            android:id="@+id/paletteRoyalBlue"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_below="@id/taskET"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_toRightOf="@id/paletteGreen"
            android:background="@color/RoyalBlue" />

        <RelativeLayout
            android:id="@+id/palettePurple"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_below="@id/taskET"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_toRightOf="@id/paletteRoyalBlue"
            android:background="@color/Purple" />

        <Button
            android:id="@+id/submitBtn"
            android:layout_width="70dp"
            android:layout_height="30dp"
            android:layout_below="@id/taskET"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_toRightOf="@id/palettePurple"
            android:background="@color/SkyBlue"
            android:textColor="@color/White"
            android:text="@string/submit">
        </Button>
    </RelativeLayout>
</LinearLayout>

<android.support.v7.widget.RecyclerView
    android:id="@+id/tasksRV"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@id/footer"/>
</RelativeLayout>

我知道这是一个布局问题，只是因为如果我删除页脚我 recyclerview 显示。什么是我的布局上面的误解？

I know this is a layout issue only because if I remove the footer my recyclerview is displayed. What is my misunderstanding of layouts above?

推荐答案

您刚才忘了添加此行

android:layout_alignParentBottom="true"

到您的页脚的布局，所以把它锚定到RelativeLayout的底部。

to your footer layout, so to anchor it to the bottom of the RelativeLayout.

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