The preview is a bit distorted

[Elip-kio]

Is there any solution？ My xml file is follow:

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

    <com.dlazaro66.qrcodereaderview.QRCodeReaderView
        android:id="@+id/qrReader"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>