Error when calling broadcastrecivercallback in kivy when build apk in buildozer

[MonsterGege]

2021-11-26 13:54:12.888 28011-28050/com.alfamart.pos I/python: File "./common/func/broadcastreceiver.py", line 56, in init
2021-11-26 13:54:12.889 28011-28050/com.alfamart.pos I/python: self.listener = BroadcastReceiver.Callback(self.callback)
2021-11-26 13:54:12.889 28011-28050/com.alfamart.pos I/python: File "./common/func/broadcastreceiver.py", line 20, in init
2021-11-26 13:54:12.890 28011-28050/com.alfamart.pos I/python: super(PythonJavaClass ,self).init(*args,**kwargs)
2021-11-26 13:54:12.891 28011-28050/com.alfamart.pos I/python: File "jnius/jnius_proxy.pxi", line 28, in jnius.jnius.PythonJavaClass.init
2021-11-26 13:54:12.891 28011-28050/com.alfamart.pos I/python: File "jnius/jnius_proxy.pxi", line 34, in jnius.jnius.PythonJavaClass._init_j_self_ptr
2021-11-26 13:54:12.891 28011-28050/com.alfamart.pos I/python: File "jnius/jnius_proxy.pxi", line 182, in jnius.jnius.create_proxy_instance
2021-11-26 13:54:12.892 28011-28050/com.alfamart.pos I/python: File "jnius/jnius_export_class.pxi", line 768, in jnius.jnius.JavaMethod.call
2021-11-26 13:54:12.892 28011-28050/com.alfamart.pos I/python: File "jnius/jnius_export_class.pxi", line 934, in jnius.jnius.JavaMethod.call_staticmethod
2021-11-26 13:54:12.893 28011-28050/com.alfamart.pos I/python: File "jnius/jnius_utils.pxi", line 91, in jnius.jnius.check_exception
2021-11-26 13:54:12.893 28011-28050/com.alfamart.pos I/python: jnius.jnius.JavaException: JVM exception occurred: interface org.kivy.android.GenericBroadcastReceiverCallback is not visible from class loader
2021-11-26 13:54:12.893 28011-28050/com.alfamart.pos I/python: Python for android ended.

Code:

-------------------------------------------------------------------

Broadcast receiver bridge

from jnius import autoclass, PythonJavaClass, java_method

JNI_NAMESPACE = u'org/kivy/android'
JAVA_NAMESPACE = u'org.kivy.android'
ACTIVITY_CLASS_NAME = 'org.kivy.android.PythonActivity'
SERVICE_CLASS_NAME = 'org.kivy.android.PythonService'

class BroadcastReceiver(object):

class Callback(PythonJavaClass):
    __javainterfaces__ = [JNI_NAMESPACE + '/GenericBroadcastReceiverCallback']
    __javacontext__ = 'app'

    def __init__(self, callback, *args, **kwargs):
        self.callback = callback
        super(PythonJavaClass ,self).__init__(*args,**kwargs)

    @java_method('(Landroid/content/Context;Landroid/content/Intent;)V')
    def onReceive(self, context, intent):
        self.callback(context, intent)

def __init__(self, callback, actions=None, categories=None):
    super().__init__()
    self.callback = callback

    if not actions and not categories:
        raise Exception('You need to define at least actions or categories')

    def _expand_partial_name(partial_name):
        if '.' in partial_name:
            return partial_name  # Its actually a full dotted name
        else:
            name = 'ACTION_{}'.format(partial_name.upper())
            if not hasattr(Intent, name):
                raise Exception('The intent {} doesnt exist'.format(name))
            return getattr(Intent, name)

    # resolve actions/categories first
    Intent = autoclass('android.content.Intent')
    resolved_actions = [_expand_partial_name(x) for x in actions or []]
    resolved_categories = [_expand_partial_name(x) for x in categories or []]

    # resolve android API
    GenericBroadcastReceiver = autoclass(JAVA_NAMESPACE + '.GenericBroadcastReceiver')
    IntentFilter = autoclass('android.content.IntentFilter')
    HandlerThread = autoclass('android.os.HandlerThread')

    # create a thread for handling events from the receiver
    self.handlerthread = HandlerThread('handlerthread')

    # create a listener
    self.listener = BroadcastReceiver.Callback(self.callback)
    self.receiver = GenericBroadcastReceiver(self.listener)
    self.receiver_filter = IntentFilter()
    for x in resolved_actions:
        self.receiver_filter.addAction(x)
    for x in resolved_categories:
        self.receiver_filter.addCategory(x)

def start(self):
    Handler = autoclass('android.os.Handler')
    self.handlerthread.start()
    self.handler = Handler(self.handlerthread.getLooper())
    self.context.registerReceiver(
        self.receiver, self.receiver_filter, None, self.handler)

def stop(self):
    self.context.unregisterReceiver(self.receiver)
    self.handlerthread.quit()

@property
def context(self):
    from os import environ
    if 'PYTHON_SERVICE_ARGUMENT' in environ:
        PythonService = autoclass(SERVICE_CLASS_NAME)
        return PythonService.mService
    PythonActivity = autoclass(ACTIVITY_CLASS_NAME)
    return PythonActivity.mActivity

[akshayaurora]

some reference on the cause of the issue https://stackoverflow.com/questions/13263340/findclass-from-any-thread-in-android-jni

[Julian-O]

@akshayaurora Does this mean p4a should be modified to take care of this, or are you saying it is the app developer's job? [Basically, can I close this?]

[jsnieg]

Has this been solved at all? BroadcastReceiver supposedly is in its own thread as specified here. I'm currently facing an issue where I have threads for Bluetooth and WiFi scans and Kivy seems to be confused and is not able to find GenericBroadcastReceiver.