adding an image for the widget preview

app/src/main/AndroidManifest.xml

@@ -244,7 +244,7 @@
 
         <receiver
             android:name=".helpers.MyWidgetProvider"
-            android:icon="@mipmap/ic_launcher">
+            android:icon="@drawable/img_widget_preview">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
             </intent-filter>

app/src/main/res/xml/widget_info.xml

@@ -3,6 +3,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:configure="com.simplemobiletools.gallery.pro.activities.WidgetConfigureActivity"
     android:initialLayout="@layout/widget"
+    android:previewImage="@drawable/img_widget_preview"
     android:minWidth="@dimen/widget_initial_size"
     android:minHeight="40dp"
     android:minResizeWidth="40dp"