在AndroidManifest的application裡面設定resizeableActivity的屬性為true

 <application
        android:name=".CompleteCarSellApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:resizeableActivity="true">