Is there a way to show a preview of a RecyclerView's contents as Grid in the Android Studio editor?

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有刺的猬
有刺的猬 2021-02-01 01:45

When I add the RecyclerView to the layout, it shows up as a list view in vertical order. I am using tools:listitem for this. Is there a way, such that it displays a

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  • 2021-02-01 01:50

    You are able to build a preview using xmlns:tools="http://schemas.android.com/tools" namespace.

    AndroidX[About]

    <androidx.recyclerview.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
    
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    
        tools:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
        tools:listitem="@layout/item"
        tools:itemCount="7"
        tools:orientation="vertical"
        tools:scrollbars="vertical"
        tools:spanCount="4"/>
    

    Support

    <android.support.v7.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
    
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    
        tools:layoutManager="android.support.v7.widget.GridLayoutManager"
        tools:listitem="@layout/item"
        tools:itemCount="7"
        tools:orientation="vertical"
        tools:scrollbars="vertical"
        tools:spanCount="4"/>
    

    From Android studio 3.0 you can predefine a data through the @tools:sample/* resources

    item.xml

    <?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="100dp"
        android:layout_height="150dp"
        android:layout_marginBottom="15dp"
        android:orientation="vertical"
        tools:background="@tools:sample/avatars">
    
        <TextView
            android:layout_gravity="bottom"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/colorWhite"
            tools:text="@tools:sample/first_names" />
    
    </FrameLayout>
    

    As a result your preview will look like

    [More examples]

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  • 2021-02-01 01:55

    This Worked for me (AndroidX): For 3 column grid

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvServiceList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
        app:spanCount="3"
        tools:itemCount="20"
        tools:listitem="@layout/row_item_service" />
    
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  • 2021-02-01 01:56

    To show list horizontally in preview, just use these two attributes

    tools:orientation="horizontal"
    tools:layoutManager="android.support.v7.widget.LinearLayoutManager"
    

    here's the final code

    <android.support.v7.widget.RecyclerView
            ...
            tools:listitem="@layout/single_item_layout"
            tools:orientation="horizontal"
            tools:layoutManager="android.support.v7.widget.LinearLayoutManager"/>
    
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  • 2021-02-01 01:59

    If you want to see the effect only in the preview without change the app behavior you can use the "tools" namespace as you did with listitem:

    <android.support.v7.widget.RecyclerView
            android:id="@+id/rcv_collection"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:layoutManager="android.support.v7.widget.GridLayoutManager"
            tools:spanCount="2"
            tools:listitem="@layout/item_collection"/>
    
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  • 2021-02-01 02:05

    Use

    app:layoutManager="GridLayoutManager"
    app:spanCount="3"
    tools:listitem="@layout/table_grid_item"
    
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