[Interest] Android 6.0 breaks Qt Bluetooth and requires check for dangerous permissions at run time?

Edward Sutton edward.sutton at subsite.com
Thu Apr 14 19:59:03 CEST 2016

Adding ACCESS_COARSE_LOCATION to my AndroidManifest seemed to restore Bluetooth functionality.

Does Qt 5.5 somehow take care of checking Android permissions for me?

Location permissions are considered “Dangerous Permissions”  and the following article states the app needs to check whether it has the permissions every time it runs.   A user can deny a permission if he chooses.


  *   If the device is running Android 6.0 (API level 23) or higher, and the app's targetSdkVersion<http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#target> is 23 or higher, the app requests permissions from the user at run-time. The user can revoke the permissions at any time, so the app needs to check whether it has the permissions every time it runs. For more information about requesting permissions in your app, see the Working with System Permissions<http://developer.android.com/training/permissions/index.html> training guide.


Check For Permissions


If your app needs a dangerous permission, you must check whether you have that permission every time you perform an operation that requires that permission. The user is always free to revoke the permission, so even if the app used the camera yesterday, it can't assume it still has that permission today.

To check if you have a permission, call the ContextCompat.checkSelfPermission()<http://developer.android.com/reference/android/support/v4/content/ContextCompat.html#checkSelfPermission(android.content.Context,%20java.lang.String)> method. For example, this snippet shows how to check if the activity has permission to write to the calendar:

// Assume thisActivity is the current activity
int permissionCheck = ContextCompat.checkSelfPermission(thisActivity,

If the app has the permission, the method returns PackageManager.PERMISSION_GRANTED<http://developer.android.com/reference/android/content/pm/PackageManager.html#PERMISSION_GRANTED>, and the app can proceed with the operation. If the app does not have the permission, the method returns PERMISSION_DENIED<http://developer.android.com/reference/android/content/pm/PackageManager.html#PERMISSION_DENIED>, and the app has to explicitly ask the user for permission.

Does Qt do the ContextCompat.checkSelfPermission?  Or do I need a JNI to call this?


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