Where should I put my AdminManager.java in a QT project?

Question

Android

Hi all. Trying to make a kiosk mode app for android 5.1 using QT 5.9.9
AndroidManifest.xml

<?xml version="1.0"?>
<manifest package="inc.garage.ncf05m" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="0.1" android:versionCode="1" android:installLocation="auto">
    <application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="-- %%INSERT_APP_NAME%% --" android:icon="@drawable/icon">
        <receiver android:name=".AdminManager" android:permission="android.permission.BIND_DEVICE_ADMIN">
            <meta-data android:name="android.app.device_admin" android:resource="@xml/policies" />
            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
            </intent-filter>
        </receiver>

        <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation" android:name="org.qtproject.qt5.android.bindings.QtActivity" android:label="-- %%INSERT_APP_NAME%% --" android:screenOrientation="portrait" android:launchMode="singleTask">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
                <category android:name="android.intent.category.HOME"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
            <intent-filter>
                <action android:name="android.settings.SETTINGS"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
.....

/android/res/xml/policies.xml

<device-admin>
</device-admin>

/android/src/inc/garage/nfc05m/AdminManager.java

package inc.garage.nfc05m;
import android.app.admin.DeviceAdminReceiver;
public class AdminManager extends DeviceAdminReceiver{
}

After deploying the application, I try to get the device owner adb:

$adb shell dpm set-device-owner inc.garage.ncf05m/.AdminManager
Success: Device owner set to package inc.garage.ncf05m
Active admin set to component {inc.garage.ncf05m/inc.garage.ncf05m.AdminManager}

At the same time, the application crashes and application output qt creatora says the following:

LOGCAT: E/AndroidRuntime( 2110): FATAL EXCEPTION: main

LOGCAT: E/AndroidRuntime( 2110): Process: inc.garage.ncf05m, PID: 2110

LOGCAT: E/AndroidRuntime( 2110): java.lang.RuntimeException: Unable to instantiate receiver inc.garage.ncf05m.AdminManager: java.lang.ClassNotFoundException: Didn't find class "inc.garage.ncf05m.AdminManager" on path: DexPathList

The question is where to put the file with the AdminManager class so that everyone can find it if necessary. Thank you!