<uiautomator2.Device>.dump_hierarchy() causes java.lang.NullPointerException in certain screens (java.lang.NullPointerException)

[felipegetulio]

Hi, is there already an issue for this?

device.dump_hierarchy(compressed=compressed, pretty=pretty, max_depth=max_depth)
my-venv/lib/python3.10/site-packages/uiautomator2/__init__.py:107: in dump_hierarchy
    content = self._do_dump_hierarchy(compressed, max_depth)
my-venv/lib/python3.10/site-packages/decorator.py:235: in fun
    return caller(func, *(extras + args), **kw)
my-venv/lib/python3.10/site-packages/retry/api.py:90: in retry_decorator
    return __retry_internal(partial(f, *args, **kwargs), exceptions, tries, delay, max_delay, backoff, jitter,
my-venv/lib/python3.10/site-packages/retry/api.py:35: in __retry_internal
    return f()
my-venv/lib/python3.10/site-packages/uiautomator2/__init__.py:122: in _do_dump_hierarchy
    content = self.jsonrpc.dumpWindowHierarchy(compressed, max_depth)
my-venv/lib/python3.10/site-packages/uiautomator2/base.py:158: in __call__
    return self.server.jsonrpc_call(self.method, params, http_timeout)
my-venv/lib/python3.10/site-packages/uiautomator2/core.py:311: in jsonrpc_call
    return _jsonrpc_call(self._dev, self._device_server_port, method, params, timeout, self._debug)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dev = AdbDevice(serial=NW6T110101), device_port = 9008
method = 'dumpWindowHierarchy', params = (False, 50), timeout = 300
print_request = False

    def _jsonrpc_call(dev: adbutils.AdbDevice, device_port: int, method: str, params: Any, timeout: float, print_request: bool) -> Any:
        """Send jsonrpc call to uiautomator2 server
    
        Raises:
            UiAutomationError
        """
        payload = {
            "jsonrpc": "2.0",
            "id": 1,
            "method": method,
            "params": params
        }
        r = _http_request(dev, device_port, "POST", "/jsonrpc/0", payload, timeout=timeout, print_request=print_request)
        data = r.json()
        if not isinstance(data, dict):
            raise RPCInvalidError("Unknown RPC error: not a dict")
    
        if isinstance(data, dict) and "error" in data:
            logger.debug("jsonrpc error: %s", data)
            code = data['error'].get('code')
            message = data['error'].get('message', '')
            stacktrace = data['error'].get('data')
            if "UiAutomation not connected" in r.text:
                raise UiAutomationNotConnectedError("UiAutomation not connected")
            if "android.os.DeadObjectException" in message:
                # https://developer.android.com/reference/android/os/DeadObjectException
                raise UiAutomationNotConnectedError("android.os.DeadObjectException")
            if "android.os.DeadSystemRuntimeException" in message:
                raise UiAutomationNotConnectedError("android.os.DeadSystemRuntimeException")
            if "uiautomator.UiObjectNotFoundException" in message:
                raise UiObjectNotFoundError(code, message, params)
            if "java.lang.StackOverflowError" in message:
                raise RPCStackOverflowError(f"StackOverflowError: {message}", params, stacktrace[:1000] + "..." + stacktrace[-1000:])
>           raise RPCUnknownError(f"Unknown RPC error: {code} {message}", params, stacktrace)
E           uiautomator2.exceptions.RPCUnknownError: ('Unknown RPC error: -32001 java.lang.NullPointerException', (False, 50), "java.lang.NullPointerException: Attempt to read from field 'int android.accessibilityservice.AccessibilityServiceInfo.flags' on a null object reference in method 'void uiautomator.InstrumentShellWrapper.setCompressedLayoutHierarchy(boolean)'
    at uiautomator.InstrumentShellWrapper.setCompressedLayoutHierarchy(InstrumentShellWrapper.java:77)
    at com.wetest.uia2.stub.AutomatorServiceImpl.dumpWindowHierarchy(AutomatorServiceImpl.java:273)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.googlecode.jsonrpc4j.JsonRpcBasicServer.invoke(JsonRpcBasicServer.java:467)
    at com.googlecode.jsonrpc4j.JsonRpcBasicServer.handleObject(JsonRpcBasicServer.java:352)
    at com.googlecode.jsonrpc4j.JsonRpcBasicServer.handleJsonNodeRequest(JsonRpcBasicServer.java:283)
    at com.googlecode.jsonrpc4j.JsonRpcBasicServer.handleRequest(JsonRpcBasicServer.java:251)
    at com.wetest.uia2.stub.AutomatorHttpServer.serve(AutomatorHttpServer.java:101)
    at fi.iki.elonen.NanoHTTPD.serve(NanoHTTPD.java:2244)
    at fi.iki.elonen.NanoHTTPD$HTTPSession.execute(NanoHTTPD.java:945)
    at fi.iki.elonen.NanoHTTPD$ClientHandler.run(NanoHTTPD.java:192)
    at java.lang.Thread.run(Thread.java:1012)")


my-venv/lib/python3.10/site-packages/uiautomator2/core.py:194: RPCUnknownError

[Zeros2619]

可能是因为系统的UiAutomation被其他进程占用了，可以试试重启设备