callback

问题 Following is my adapter for a RecyclerView where i need to update one of the TextView which shows distance of current location to another location . Now , to get the current location , i am using mFusedLocationClient.requestLocationUpdates(mFusedLocationRquest,mLocationCallback,null); If i am going with the below code and have just enabled gps in app with runtime permission , i face NPE on line : float distance = updatedLoc.distanceTo(des); App does not crash when i open with gps already

问题 I have a custom view component. I used it in either fragment or activity. I would like to know if there's a callback when it's destroyed from fragment/activity? 回答1: View does not have a callback (except finalize() , but I don't think that's what you're asking for). View has onDetachedFromWindow() when it is removed from the screen, but this is not related to it being destroyed -- it could be attached again, which will call onAttachedToWindow() . Fragment has onDestroyView() , which may be

问题 I am using Picasso library to load image from url. The code I used is below. Picasso.with(getContext()).load(url).placeholder(R.drawable.placeholder) .error(R.drawable.placeholder).into(imageView); What I wanna do is to get the image that loaded from url. I used Drawable image = imageView.getDrawable(); However, this will always return placeholder image instead of the image load from url. Do you guys have any idea? How should I access the drawable image that it's just loaded from url. Thanks

问题 There is a tricky post handler, sometimes it can take a lots of time (depending on a input values), sometimes not. What I want is to write back whenever 1 second passes, dynamically allocating the response. def post(): def callback(): self.write('too-late') self.finish() timeout_obj = IOLoop.current().add_timeout( dt.timedelta(seconds=1), callback, ) # some asynchronous operations if not self.request.connection.stream.closed(): self.write('here is your response') self.finish() IOLoop.current(

问题 There is a tricky post handler, sometimes it can take a lots of time (depending on a input values), sometimes not. What I want is to write back whenever 1 second passes, dynamically allocating the response. def post(): def callback(): self.write('too-late') self.finish() timeout_obj = IOLoop.current().add_timeout( dt.timedelta(seconds=1), callback, ) # some asynchronous operations if not self.request.connection.stream.closed(): self.write('here is your response') self.finish() IOLoop.current(

问题 Is it possible to use the argument of a function definition in an interface as type ( into an array of type or interface ? ) export interface MiddlewareEvent { onNewAccount: (accountId: string, timestamp: number) => void, onAccountDelete: (accountId:string, timestamp:number)=>void, } const middlewareMap: Map<keyof MiddlewareEvent,((...arg: any) => void )[]> = new Map(); function fireMiddleware<EventName extends keyof MiddlewareEvent>( eventId: EventName, args: any[] ) { const middleware =

问题 I am trying to get the dependency between a slider, user input and a table to work. I have tried outputting the data and using a callback to update it. I was advised to just create the table in a callback and just use a "Div." to define its location in the display. other info: table is created from a pandas DataFrame, using dash_table library. data is in dictionary format. with a the variable threshold being the value adjusted by user input (slider or input) I would be grateful if someone

问题 I have a callback that computes a couple of additional metrics in on_epoch_end for validation data and every 10 epochs for test data. I also have a CSVLogger callback that saves normal metrics to a log file. Is there an easy way from my callback to add a column or two to the logs that gets properly written by CSVLogger ? 回答1: You can insert your additional metrics into the dictionary logs . from keras.callbacks import Callback class ComputeMetrics(Callback): def on_epoch_end(self, epoch, logs

问题 I have passed as callback a C++ member function to a C# project through a C++/CLI wrapper (this works fine). The C# project is going to call this delegate when receiving data from another .exe process: an event will be raised and a method will call this callback. So, I needed to "save" this Action delegate using an static instance of a C# class already created. I got the following code: // C++ unmanaged function WRAPPER_API void dispatchEvent(std::function<void(int)> processEvent) { Iface:

问题 I have passed as callback a C++ member function to a C# project through a C++/CLI wrapper (this works fine). The C# project is going to call this delegate when receiving data from another .exe process: an event will be raised and a method will call this callback. So, I needed to "save" this Action delegate using an static instance of a C# class already created. I got the following code: // C++ unmanaged function WRAPPER_API void dispatchEvent(std::function<void(int)> processEvent) { Iface: