RecyclerView and gridView

问题

I implemented gridview using recyclerview the problem is that images are not showing properly like there is so much space between images, here is xml of mainactivity and griditem.xml

mainactivity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    android:elevation="4dp"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

<android.support.v7.widget.RecyclerView
    android:id="@+id/rv"
    android:layout_below="@+id/toolbar"
    android:layout_width="match_parent"
    android:scrollbars="vertical"
    android:layout_height="match_parent"/>
</RelativeLayout>

griditem.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">

<ImageView
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:layout_gravity="center"
    android:id="@+id/iv"/>
</LinearLayout>

And in mainactivity:

GridLayoutManager grid = new GridLayoutManager(this,2);
recyclerView.setAdapter(new MovieRecyclerAdapter());
recyclerView.setLayoutManager(grid);

and the result is like this

you can see there is space around two columns of image, how can i remove these spaces?

After height to wrap content

回答1:

girditem.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/iv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

To add spaces between items set the margin to your desired number of dp

回答2:

Do this:

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    android:elevation="4dp"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

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

Your item xml outer layout should also have the height as wrap_content

来源：https://stackoverflow.com/questions/45555970/recyclerview-and-gridview