android - Camera preview not working on layout using ConstraintLayout/Guidelines -


i'm trying create custom barcode scanner ui using zxing android embedded (https://github.com/journeyapps/zxing-android-embedded), camera preview not render anything, rectangle , laser rendered.

is there known issue or mistake in code?

activity

<android.support.constraint.constraintlayout 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="com.fcagroup.abtrace.activities.scanneractivity"     android:id="@+id/fullscreen_content"     android:descendantfocusability="beforedescendants"     android:focusableintouchmode="true">        <android.support.constraint.guideline         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:id="@+id/guideline"         android:orientation="horizontal"         app:layout_constraintguide_percent="0.85"         tools:layout_editor_absolutey="482dp"         tools:layout_editor_absolutex="0dp" />      <android.support.constraint.constraintlayout         android:layout_width="0dp"         android:layout_height="0dp"         app:layout_constraintbottom_tobottomof="parent"         app:layout_constraintleft_toleftof="parent"         app:layout_constrainttop_totopof="@+id/guideline"         app:layout_constraintright_torightof="parent"         app:layout_constrainthorizontal_bias="1.0"         app:layout_constraintvertical_bias="1.0"         android:background="@color/black_overlay">          <edittext             android:id="@+id/edittext"             android:layout_width="0dp"             android:layout_height="wrap_content"             android:ems="10"             android:inputtype="textpersonname"             android:text="name"             app:layout_constraintbottom_tobottomof="parent"             android:layout_marginbottom="6dp"             android:layout_marginleft="8dp"             app:layout_constraintleft_toleftof="parent"             app:layout_constraintright_toleftof="@+id/button"             android:layout_marginright="8dp"             app:layout_constrainthorizontal_bias="0.508"             android:layout_marginstart="8dp"             android:layout_marginend="8dp" />          <button             android:id="@+id/button"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="button"             android:layout_marginright="8dp"             app:layout_constraintright_torightof="parent"             app:layout_constraintbottom_tobottomof="parent"             android:layout_marginbottom="8dp"             android:layout_marginend="8dp" />          <textview             android:id="@+id/textview"             android:layout_width="0dp"             android:layout_height="wrap_content"             android:text="textview"             android:layout_marginright="8dp"             app:layout_constraintright_torightof="parent"             android:layout_marginleft="8dp"             app:layout_constraintleft_toleftof="parent"             app:layout_constrainttop_totopof="parent"             android:layout_margintop="8dp"             android:layout_marginbottom="8dp"             app:layout_constraintbottom_totopof="@+id/edittext"             android:layout_marginstart="8dp"             android:layout_marginend="8dp" />     </android.support.constraint.constraintlayout>      <relativelayout         android:layout_width="0dp"         android:layout_height="0dp"         android:layout_marginleft="0dp"         android:layout_marginright="0dp"         android:layout_margintop="0dp"         app:layout_constrainthorizontal_bias="0.0"         app:layout_constraintleft_toleftof="parent"         app:layout_constraintright_torightof="parent"         app:layout_constrainttop_totopof="parent"         android:layout_marginbottom="0dp"         app:layout_constraintbottom_totopof="@+id/guideline">          <com.journeyapps.barcodescanner.decoratedbarcodeview             android:id="@+id/zxing_barcode_scanner"             android:layout_width="match_parent"             android:layout_height="match_parent"             app:zxing_scanner_layout="@layout/custom_barcode_scanner" />      </relativelayout>  </android.support.constraint.constraintlayout>

custom_barcode_scanner layout

<?xml version="1.0" encoding="utf-8"?> <merge xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     xmlns:app="http://schemas.android.com/apk/res-auto">      <com.journeyapps.barcodescanner.barcodeview         android:layout_width="match_parent"         android:layout_height="match_parent"         android:id="@+id/zxing_barcode_surface"         app:zxing_framing_rect_width="250dp"         app:zxing_framing_rect_height="50dp"/>      <com.journeyapps.barcodescanner.viewfinderview         android:layout_width="match_parent"         android:layout_height="match_parent"         android:id="@+id/zxing_viewfinder_view"         app:zxing_possible_result_points="@color/zxing_custom_possible_result_points"         app:zxing_result_view="@color/zxing_custom_result_view"         app:zxing_viewfinder_laser="@color/zxing_custom_viewfinder_laser"         app:zxing_viewfinder_mask="@color/zxing_custom_viewfinder_mask"/>  </merge>

here's how rendered (this code based on sample @ https://github.com/journeyapps/zxing-android-embedded/blob/master/sample/src/main/res/layout/activity_custom_scanner.xml):

screenshot


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