Getting JNI right to invoke camera on androidx

[m2dtkast]

Hi,

I am trying to get this example: https://github.com/minixxie/examples/tree/master/qt-for-mobile/TestExternalAndroidCamera1
to work on android abi 29 (added the android:requestLegacyExternalStorage="true" flag to application entry in manifest);

Faced some challenges most likely due to problems with this s*cker : https://stackoverflow.com/questions/57116335/environment-getexternalstoragedirectory-deprecated-in-api-level-29-java#57116787
getting a SIG33 error when running this "out of the box" , more specifically:

JNI DETECTED ERROR IN APPLICATION: JNI GetStaticMethodID called with pending exception android.os.FileUriExposedException: file:///storage/emulated/0/camera.jpg exposed beyond app through ClipData.Item.getUri()

Any help would be very much appreciated.

EDIT : might be related to not using getUriForFile, so I tried to throw in this :

    QAndroidJniObject filename = QAndroidJniObject::callStaticObjectMethod(
            "android/support/v4/content/FileProvider",
            "getUriForFile",  // only the function name!!
            "(Landroid/content/Context;Ljava/lang/String;Ljava/io/File;)Landroid/net/Uri;",
            QtAndroid::androidActivity().object(),
            "org.qtproject.qt5.android.bindings.QtApplication.provider",
            photo.object());

but it does not seem to yield a valid result, instead i get

java.lang.ClassNotFoundException: Didn't find class "android.support.v4.content.FileProvider" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib]]

most likely for the same reason above?

[ekkescorner]

@m2dtkast does your build.gradle contain

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
    compile 'com.android.support:support-v4:25.3.1'
}