add permissions request method

CHANGELOG.rst

@@ -18,6 +18,7 @@ Changed
 * Don't change ctypes' global state ``bleak.backends.winrt.util``.
 * Improved performance of BlueZ backend when there are many adapters.
 * Added support for Python 3.13.
+* **BREAKING CHANGE** Android backend do not request permissions in background. ``request_permissions()`` has to be called explicitly.
 
 `0.22.2`_ (2024-06-01)
 ======================

bleak/backends/p4android/defs.py

@@ -36,6 +36,7 @@
     BLEAK_JNI_NAMESPACE + ".PythonBluetoothGattCallback"
 )
 
+VERSION = autoclass('android.os.Build$VERSION')
 
 class ScanFailed(enum.IntEnum):
     ALREADY_STARTED = ScanCallback.SCAN_FAILED_ALREADY_STARTED

bleak/backends/p4android/scanner.py

@@ -12,7 +12,6 @@
     from asyncio import timeout as async_timeout
 
 from android.broadcast import BroadcastReceiver
-from android.permissions import Permission, request_permissions
 from jnius import cast, java_method
 
 from ...exc import BleakError
@@ -73,30 +72,6 @@ async def start(self) -> None:
             if self.__callback is None:
                 self.__callback = _PythonScanCallback(self, loop)
 
-            permission_acknowledged = loop.create_future()
-
-            def handle_permissions(permissions, grantResults):
-                if any(grantResults):
-                    loop.call_soon_threadsafe(
-                        permission_acknowledged.set_result, grantResults
-                    )
-                else:
-                    loop.call_soon_threadsafe(
-                        permission_acknowledged.set_exception(
-                            BleakError("User denied access to " + str(permissions))
-                        )
-                    )
-
-            request_permissions(
-                [
-                    Permission.ACCESS_FINE_LOCATION,
-                    Permission.ACCESS_COARSE_LOCATION,
-                    "android.permission.ACCESS_BACKGROUND_LOCATION",
-                ],
-                handle_permissions,
-            )
-            await permission_acknowledged
-
             self.__adapter = defs.BluetoothAdapter.getDefaultAdapter()
             if self.__adapter is None:
                 raise BleakError("Bluetooth is not supported on this hardware platform")

bleak/backends/p4android/utils.py

@@ -3,10 +3,14 @@
 import asyncio
 import logging
 import warnings
+from typing import List, Optional
 
+from android.permissions import Permission
+from android.permissions import request_permissions as request_android_permissions
 from jnius import PythonJavaClass
 
 from ...exc import BleakError
+from . import defs
 
 logger = logging.getLogger(__name__)
 
@@ -92,3 +96,34 @@ def _result_state_unthreadsafe(self, failure_str, source, data):
                 else:
                     # send it on the event thread
                     raise exception
+
+async def request_permissions(permissions: Optional[List[str]] = None) -> None:
+    loop = asyncio.get_running_loop()
+    permission_acknowledged = loop.create_future()
+    def handle_permissions(permissions, grantResults):
+        if any(grantResults):
+            loop.call_soon_threadsafe(
+                permission_acknowledged.set_result, grantResults
+            )
+        else:
+            loop.call_soon_threadsafe(
+                permission_acknowledged.set_exception(
+                    BleakError("User denied access to " + str(permissions))
+                )
+            )
+    if permissions is None:
+        permissions = [
+            Permission.ACCESS_FINE_LOCATION,
+            Permission.ACCESS_COARSE_LOCATION,
+            Permission.ACCESS_BACKGROUND_LOCATION,
+        ]
+        if defs.VERSION.SDK_INT >= 31:
+            permissions.extend([
+                Permission.BLUETOOTH_SCAN,
+                Permission.BLUETOOTH_CONNECT,
+            ])
+    request_android_permissions(
+            permissions,
+            handle_permissions,
+        )
+    await permission_acknowledged

examples/kivy/main.py

@@ -1,4 +1,5 @@
 import asyncio
+import os
 
 import bleak
 from kivy.app import App
@@ -38,6 +39,9 @@ def on_stop(self):
         self.running = False
 
     async def example(self):
+        if os.environ.get("P4A_BOOTSTRAP") is not None:
+            from bleak.backends.p4android.utils import request_permissions
+            await request_permissions()
         while self.running:
             try:
                 self.line("scanning")