elements are not showing in the design editor android studio - layout-editor

Question

Elements are not showing in the design editor android studio.
I have added image views in the layout editor but it is showing up in the editor. I have also tried to change theme types but still it's not working. I have also tryed changing the layout type.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:id="#+id/relativeLayout">
<GridLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/board"
android:columnCount="3"
android:rowCount="3"
tools:targetApi="ice_cream_sandwich"
tools:layout_conversion_absoluteHeight="0dp"
tools:layout_editor_absoluteY="0dp"
tools:layout_editor_absoluteX="0dp"
tools:layout_conversion_absoluteWidth="0dp">
<ImageView
android:id="#+id/imageView8"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_alignParentBottom="true"
android:layout_column="0"
android:layout_marginLeft="27dp"
android:layout_marginTop="10dp"
android:layout_row="0"
android:contentDescription="TODO"
android:src="#drawable/red" />
<ImageView
android:id="#+id/imageView7"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_alignParentBottom="true"
android:layout_column="2"
android:layout_marginLeft="35dp"
android:layout_marginTop="10dp"
android:layout_row="0"
android:contentDescription="TODO"
android:src="#drawable/red" />
<ImageView
android:id="#+id/imageView6"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_alignParentBottom="true"
android:layout_column="0"
android:layout_marginLeft="10dp"
android:layout_row="1"
android:contentDescription="TODO"
android:src="#drawable/red" />
<ImageView
android:id="#+id/imageView5"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_alignParentBottom="true"
android:layout_column="1"
android:layout_marginLeft="27dp"
android:layout_row="1"
android:contentDescription="TODO"
android:src="#drawable/red" />
<ImageView
android:id="#+id/imageView4"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_alignParentBottom="true"
android:layout_column="2"
android:layout_marginLeft="35dp"
android:layout_row="1"
android:contentDescription="TODO"
android:src="#drawable/red" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_column="0"
android:layout_marginLeft="10dp"
android:layout_row="3"
android:contentDescription="TODO"
android:src="#drawable/red" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_column="1"
android:layout_marginLeft="27dp"
android:layout_row="2"
android:contentDescription="TODO"
android:src="#drawable/red"
android:layout_marginStart="27dp" />
<ImageView
android:id="#+id/imageView"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_column="0"
android:layout_margin="10dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:layout_row="0"
android:contentDescription="TODO"
android:src="#drawable/red" />
<ImageView
android:id="#+id/imageView9"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_alignParentBottom="true"
android:layout_column="2"
android:layout_marginLeft="35dp"
android:layout_row="2"
android:contentDescription="TODO"
android:src="#drawable/red" />
</GridLayout>
</RelativeLayout>

Answer 1

Go to the project view on the left side of android studio.
Then select app-> res-> values-> styles :
Inside the styles.xml file you'll find something like this :
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
Change it to :
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
Simply add "Base." before Theme and the design view should work just fine.