My preview application looks like this:

How can I make it look like viewing a WhatsApp chat, small with shadow. Also, other applications on my phone use the same type of preview.
My xml widget:
<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
xmlns:android="http://schemas.android.com/apk/res/android"
android:initialLayout="@layout/appwidget"
android:minHeight="40dp"
android:minWidth="320dp"
android:previewImage="@mipmap/ic_launcher"
android:updatePeriodMillis="300000" >
</appwidget-provider>
manifest:
<receiver
android:name=".activities.MyWidgetProvider"
android:label="Example Widget">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/widget_info" />
</receiver>
UPDATE:
In fact, I noticed all the shortcuts, not widgets, they all look like this.
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