Initialize fails on first call

Describe the bug The result of

bool initialized = await FlutterBackground.initialize(androidConfig: androidConfig);

is always false, since

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?): Boolean {
    try {
        if (alreadyCalled || requestCode != PermissionHandler.PERMISSION_CODE_IGNORE_BATTERY_OPTIMIZATIONS) {
            return false
        }

        alreadyCalled = true

        // THIS IS ALWAYS FALSE
        onSuccess(resultCode == Activity.RESULT_OK)
    } catch (ex: Exception) {
        onError("flutter_background.PermissionHandler", "Error while waiting for user to disable battery optimizations", ex.localizedMessage)
    }

    return true
}

resultCode always contains 0 no matter what the answer.

Even ignoring the return value of initialize in Flutter would not work, since the plugin does not continue to initialize itself.

To Reproduce On the first run with following code:

await FlutterBackground.initialize(androidConfig: androidConfig);

if (await FlutterBackground.hasPermissions) {
  await FlutterBackground.enableBackgroundExecution();
}

Confirm the allow permission request.

The application throws an exception and the background execution is not enabled. The second walk through works, since the permission is then already granted.

Expected behavior

Since the same code works on Android 11 I guess the solution is to find a way to get a proper result code from the permission request. I don't know how to achieve this.

As an alternative for me also works to ignore the result code and always return true.

Smartphone: Observed with:

Device: Motorola neo 30
OS: Android 12

Seems to work properly on

Device: ACEPAD A145
OS: Android 11

Thanks for your nice plugin.

JulianAssmann / flutter_background

Initialize fails on first call #76