How to create a LiveWallpaper for Android in Qt?

public class QtWallpaperService extends WallpaperService {
/* тут все скопировано из QtService, но вместо onCreate() -> onCreateEngine() */
    @Override
    public Engine onCreateEngine() {
        Toast.makeText(getApplicationContext(), "onCreateEngine()", Toast.LENGTH_LONG).show(); // ok
        return new QtWallpaperEngine(m_loader);
    }

    private class QtWallpaperEngine extends Engine {
        private boolean mVisible = false;
        private final Handler mHandler = new Handler();
	private QtWallpaperServiceLoader m_loader;

        private final Runnable mUpdateDisplay = new Runnable() {
            public void run() {
                 Toast.makeText(getApplicationContext(), "run()", Toast.LENGTH_LONG).show(); // ничего
		 m_loader.onCreate();
            }
        };
 
    private class QtWallpaperEngine extends Engine {
        private boolean mVisible = false;
        private final Handler mHandler = new Handler();
        private QtWallpaperServiceLoader m_loader;

        private final Runnable mUpdateDisplay = new Runnable() {
            public void run() {
            Toast.makeText(getApplicationContext(), "run()", Toast.LENGTH_LONG).show(); // ничего
                m_loader.onCreate();
            }
        };
 
        public QtWallpaperEngine(QtWallpaperServiceLoader loader) {
            super();
            Toast.makeText(getApplicationContext(), "QtWallpaperEngine()", Toast.LENGTH_LONG).show(); // ok
            m_loader = loader;
        }
 
        private void draw() {
            Toast.makeText(getApplicationContext(), "draw()", Toast.LENGTH_LONG).show(); // ничего (ну оно и понятно)
            m_loader.onCreate();
        }
 
        @Override
        public void onVisibilityChanged(boolean visible) {
            Toast.makeText(getApplicationContext(), "onVisibilityChanged: " + visible, Toast.LENGTH_LONG).show(); // ok onVisibilityChanged: true
            m_loader.onCreate();
        }
 
        @Override
        public void onSurfaceChanged(SurfaceHolder holder,
                    int format, int width, int height) {
        }
 
        @Override
        public void onSurfaceDestroyed(SurfaceHolder holder) {
            
        }
 
        @Override
        public void onDestroy() {
            
        }
    }
}

<!--                                                            ФИНТ vvvvvvvvvvvvvvvvvvvvvvvv -->
    <service android:process=":qt" android:name="org.qtproject.qt5.android.bindings.QtWallpaperService"
            android:enabled="true"
            android:label="Wallpaper Example"
            android:permission="android.permission.BIND_WALLPAPER">
        <!-- android:process=":qt" is needed to force the service to run on a separate process than the Activity -->

            <intent-filter>
                <action android:name="android.service.wallpaper.WallpaperService" >
                </action>
            </intent-filter>

            <meta-data
                android:name="android.service.wallpaper" android:value="-- %%INSERT_APP_LIB_NAME%% --"
                android:resource="@xml/mywallpaper" >
            </meta-data>

            <!-- Ministro -->
            <meta-data android:name="android.app.qt_sources_resource_id" android:resource="@array/qt_sources"/>
            <meta-data android:name="android.app.repository" android:value="default"/>
            <meta-data android:name="android.app.qt_libs_resource_id" android:resource="@array/qt_libs"/>
            <meta-data android:name="android.app.bundled_libs_resource_id" android:resource="@array/bundled_libs"/>
            <!-- Ministro -->

            <!-- Deploy Qt libs as part of package -->
            <meta-data android:name="android.app.bundle_local_qt_libs" android:value="-- %%BUNDLE_LOCAL_QT_LIBS%% --"/>
            <meta-data android:name="android.app.bundled_in_lib_resource_id" android:resource="@array/bundled_in_lib"/>
            <meta-data android:name="android.app.bundled_in_assets_resource_id" android:resource="@array/bundled_in_assets"/>
            <!-- Deploy Qt libs as part of package -->

            <!-- Run with local libs -->
            <meta-data android:name="android.app.use_local_qt_libs" android:value="-- %%USE_LOCAL_QT_LIBS%% --"/>
            <meta-data android:name="android.app.libs_prefix" android:value="/data/local/tmp/qt/"/>
            <meta-data android:name="android.app.load_local_libs" android:value="-- %%INSERT_LOCAL_LIBS%% --"/>
            <meta-data android:name="android.app.load_local_jars" android:value="-- %%INSERT_LOCAL_JARS%% --"/>
            <meta-data android:name="android.app.static_init_classes" android:value="-- %%INSERT_INIT_CLASSES%% --"/>
            <!-- Run with local libs -->

            <!--  Messages maps -->
            <meta-data android:value="@string/ministro_not_found_msg" android:name="android.app.ministro_not_found_msg"/>
            <meta-data android:value="@string/ministro_needed_msg" android:name="android.app.ministro_needed_msg"/>
            <meta-data android:value="@string/fatal_error_msg" android:name="android.app.fatal_error_msg"/>
            <!--  Messages maps -->

            <meta-data android:name="android.app.background_running" android:value="true"/>
        </service>