Qt6.5.0: Resource theme link error

TheoSys

I try to port an app for Android running with Qt5.15 to Qt6.5.0. The code is already ported and compiles fine. Everything but the manifest file seems to compile. I fixed the qt5 part in the paths. Here is the top of my manifest file

<?xml version="1.0"?>
<manifest
    package="org.qtproject.theosys"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:versionName="-- %%INSERT_VERSION_NAME%% --"
    android:versionCode="-- %%INSERT_VERSION_CODE%% --"
    android:installLocation="auto"
    android:requestLegacyExternalStorage="true">
    <!-- %%INSERT_PERMISSIONS -->
    <!-- %%INSERT_FEATURES -->
    <supports-screens
        android:largeScreens="true"
        android:normalScreens="true"
        android:anyDensity="true"
        android:smallScreens="true"/>
    <application
        android:hardwareAccelerated="true"
        android:name="org.qtproject.android.qt.android.bindings.QtApplication"
        android:label="-- %%INSERT_APP_NAME%% --"
        android:extractNativeLibs="true"
        android:requestLegacyExternalStorage="true"
        android:allowNativeHeapPointerTagging="false"
        android:allowBackup="true"
        android:fullBackupOnly="false"
        android:icon="@drawable/icon"
        android:theme="@style/Theme.AppCompat.NoActionBar">
        <activity
            android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density"
            android:name="org.qtproject.qt.android.bindings.QtActivity"
            android:label="-- %%INSERT_APP_NAME%% --"
            android:launchMode="singleTop"
            android:screenOrientation="nosensor"
            android:exported="true">
[...]

And here is the error I get:

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.
-----------
* What went wrong:
Execution failed for task ':processReleaseResources'.
> A failure occurred while executing com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask$TaskAction
   > Android resource linking failed
     error: resource style/Theme.AppCompat.NoActionBar (aka org.qtproject.theosys:style/Theme.AppCompat.NoActionBar) not found.
     error: resource style/Theme.AppCompat.NoActionBar (aka org.qtproject.theosys:style/Theme.AppCompat.NoActionBar) not found.
     error: resource style/Theme.AppCompat (aka org.qtproject.theosys:style/Theme.AppCompat) not found.
     error: failed linking references.


* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
==============================================================================

What is wrong with the theme? It worked this way wth Qt5. What do I miss?

A.T.

TheoSys

I've to answer my own question. The problem was that I had do add a dependency to the file build.gradle. The section should look like:

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'androidx.preference:preference:1.1.0'
}

The second dependency ('androidx.preference:preference:1.1.0) is necessary if you use the new setup system (preferences) from Android.

A.T.