Qt 6.4 and permissions

Francky033

Hello,

I'm trying to access the Android permissions under 6.4 but it doesn't seem to work. I proceed as follows:

bool checkPermission(QString string)
{
	auto result = QtAndroidPrivate::checkPermission(string).then([](
		QtAndroidPrivate::PermissionResult result) {
			return result;
		});
	result.waitForFinished();
	return result.result() != QtAndroid::PermissionResult::Denied;
}

bool requestPermission(QString string)
{
	auto result = QtAndroidPrivate::requestPermission(string);
	return result.result() != QtAndroid::PermissionResult::Denied;
}

In my main.cpp, I have :

if (!checkPermission("android.permission.ACCESS_FINE_LOCATION"))
		requestPermission("android.permission.ACCESS_FINE_LOCATION");

In my AndroidManifest, I have:

<uses-permission android:name="com.android.vending.CHECK_LICENSE"/>
<uses-permission android:name="com.android.vending.BILLING"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CAMERA"/>

And at runtime, I hold:

W qt.positioning.android: : Position data not available due to missing permission 4

I saw that the teams are working on a permissions system for Qt 6.x (https://bugreports.qt.io/browse/QTBUG-90498)
Should we wait until it is ready or can we use a method similar to mine but that works?

Thank you!

hamer

Does this only happen with the location permission? From my experience you have to request the location permission separately when the app has been loaded (i.e. the user interface is visible).

voltron

I can confirm the issue with permission requesting. I am porting Android application from Qt5 to Qt6 and have problems with requesting various permissions, for example for camera.

All permissions are listed in the manifest and here is the code I use to check and acquire permission

auto check = QtAndroidPrivate::checkPermission( "android.permission.CAMERA" );
if ( check.result() == QtAndroidPrivate::PermissionResult::Denied )
{
  auto req = QtAndroidPrivate::requestPermission( permissionString );
  if ( req.result() == QtAndroidPrivate::PermissionResult::Denied )
  {
   return false;
  }
}

return true;

In the log I see following message after calling QtAndroidPrivate::requestPermission()

I Timeline: Timeline: Activity_launch_request time:1197901544 intent:Intent { act=android.content.pm.action.REQUEST_PERMISSIONS pkg=com.google.android.packageinstaller (has extras) }
I art     : Thread[3,tid=8328,WaitingInMainSignalCatcherLoop,Thread*=0x7f9e244e00,peer=0x12cd5a60,"Signal Catcher"]: reacting to signal 3

After this app freezes and needs to be killed.

Maybe this is a bug in Qt6.

Francky033

So, it finally seems to work under Qt6. I use :

bool checkPermission(QString chaine)
{
	auto result = QtAndroidPrivate::checkPermission(chaine).then([](
		QtAndroidPrivate::PermissionResult result) {
			return result;
		});
	result.waitForFinished();

	return result.result() != QtAndroidPrivate::PermissionResult::Denied;
}

bool requestPermission(QString chaine)
{
	auto result = QtAndroidPrivate::requestPermission(chaine).then([](
		QtAndroidPrivate::PermissionResult result) {
			return result;
		});
	result.waitForFinished();

	return result.result() != QtAndroidPrivate::PermissionResult::Denied;
}

I don't know if this is satisfactory as a method but it seems to work with Qt 6.4