如何将水平回收器视图居中？

Question

How can I make horizontal recyclerview in the center?

I have tried many ways putting android:layout_gravity="center" in recyclerView or putting recyclerview in linear layout.

But I didn't succeed.

This is my code.

This is xml file which contains my recyclerview.

    <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:orientation="horizontal">
   
       <android.support.v7.widget.RecyclerView
           android:layout_width="wrap_content"
           android:layout_height="40dp"
           android:visibility="invisible"
           android:layout_gravity="center_horizontal"
           android:layout_marginTop="-20dp"
           android:id="@+id/recycler_view">
       </android.support.v7.widget.RecyclerView>
   
   </LinearLayout>

item_row.xml file

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="horizontal" android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:layout_height="match_parent">
    
        <TextView
            android:layout_width="30dp"
            android:layout_height="match_parent"
            android:id="@+id/textview_size"
            android:background="@drawable/textview_border"
            android:gravity="center"
            android:textColor="#000000"
            />
    
    </LinearLayout>

Answer 1

You have to set the Recyleview's layout width to : wrap_content This one should work :

         <android.support.v7.widget.RecyclerView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                >

Answer 2

只需将android:gravity="center"到包含您的RecyclerView LinearLayout 。

Answer 3

use RelativeLayout insted of LinearLayout than use android:layout_centerInParent="true" of your RelativeLayout like this

    <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="horizontal">

    <android.support.v7.widget.RecyclerView
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:visibility="invisible"
        android:layout_centerInParent="true"
        android:layout_marginTop="-20dp"
        android:id="@+id/recycler_view">
    </android.support.v7.widget.RecyclerView>

</RelativeLayout>

Answer 4

3 years later but I hope my answer helps another dev.

In the parent of the element xml:

    android:layout_width="match_parent"

then set your child views to be a specific width

        android:layout_width="300dp"

And don't forget to add:

app:layout_constraintLeft_toLeftOf="parent" //If you're using constraint layout as parentw
app:layout_constraintRight_toRightOf="parent"

Answer 5

Use android:layout_gravity="center_horizontal" in your linear layout

<LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal"
                android:layout_gravity="center_horizontal">

            <android.support.v7.widget.RecyclerView
                android:layout_width="wrap_content"
                android:layout_height="40dp"
                android:visibility="invisible"
                android:layout_gravity="center_horizontal"
                android:layout_marginTop="-20dp"
                android:id="@+id/recycler_view">
            </android.support.v7.widget.RecyclerView>

    </LinearLayout>

Answer 6

Try this

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:layout_gravity="center_vertical|center_horizontal"
    android:gravity="center">

     <android.support.v7.widget.RecyclerView
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:visibility="invisible"
        android:layout_gravity="center_horizontal"
        android:id="@+id/recycler_view">
      </android.support.v7.widget.RecyclerView>

</LinearLayout>

Answer 7

<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <android.support.v7.widget.RecyclerView
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:visibility="visible"
        android:id="@+id/recycler_view">
    </android.support.v7.widget.RecyclerView>

</LinearLayout>

Answer 8

Just updated recyclerview version in gradle file and it worked now!

:)

Please update version of a library in gradle file OR to further :

compile 'com.android.support:recyclerview-v7:23.2.1'

Answer 9

For me, adding

android: layout_width = "match_parent" 

and

android: layout_weight = "1" 

to the recyclerview item xml worked.