background-process

问题 I have a background service in my android application.In which a thread listening recent tasks running frequently.My service overrides both onCreate() and onStartCommand() methods. When i tried to open some applications like Gallery , Camera etc..., the service will be stopped.It calls the onCreate() method only and not onDestroy() or onStartCommand() .I tried to override onLowMemory() in this service but it logs nothing.The application saved internally by specifying android:installLocation=

问题 When i remove my app from task manager.0 process and 1 service left. App do crash again and again what should i do to resolve it? This is my service class. I want to ask one more thing the difference between OnStart() method and OnStartCommand() method? package com.example.vaccinationsystem; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import org.ksoap2.SoapEnvelope; import org.ksoap2.serialization.PropertyInfo; import org.ksoap2.serialization

问题 I'm developing a great feature for my app which requires HTTP requests to be sent periodically in background. I have read already many articles and discussions here, but haven't come up with a solution because all suggestions I met on stackoverflow.com solve the problem only partially. Let me explain in details what do I want my application to do. Consider there is a website with API and I want to send requests (when app is in background mode) periodically to check the state of data on the

问题 Ok so forgive me if this is a repeat of another question, but after searching I have not found a clear answer. What I basically want to do is have my php web application fire off some event (like an emailer or report generator) that may take a few minutes to complete and immediately return control to the page. I come from a .NET world where this can easily be accomplished with a thread. So here's the workflow: User clicks 'generate Report' button ajax call made to '../blah/generate-report'

问题 I am sending email from Django (using Webfaction). This is, however, quite slow so I'd like to send the email in the background, returning a response to the user even if the email has not yet been sent. Any ideas for what is the best way to do this? I have read about celery, but it seems like a lot of steps to set it up: http://markliu.me/2011/sep/29/django-celery-on-webfaction-using-rabbitmq/ That's Ok, but I'd like to know that this is the way to go before trying it out. How about threads?

问题 I'm currently using MPNowPlayingInfoCenter for my app to show which song is playing, but I am looking to incorporate HTTP Live Streaming into my application, which will have any number of different tracks occurring in the background. Is there a way to set the nowPlayingInfo while the application is in the background (Call a function after a certain amount of time?), even though applications technically don't actually run in the background? Or is there a way to set the now playing information

问题 I'm currently using MPNowPlayingInfoCenter for my app to show which song is playing, but I am looking to incorporate HTTP Live Streaming into my application, which will have any number of different tracks occurring in the background. Is there a way to set the nowPlayingInfo while the application is in the background (Call a function after a certain amount of time?), even though applications technically don't actually run in the background? Or is there a way to set the now playing information

问题 I've looked up and down for this problem, but no one seems to have it. I have two iPads. One is acting as a Bluetooth peripheral that is always in the foreground. Since I am more interested in the central side, I have made my central iPad background-capable for BLE-central. My workflow is as follows: Central app runs and starts scanning Peripheral advertises service (or comes within range) Central device connects to peripheral and stops scanning Peripheral stops advertisement (or leaves range

问题 I have a problem keeping the GPS running in background. I succeded to keep the GPS running when the app is in background, but it stops sometimes. I noticed that it stops when i enter in a building and i stay there for 2-3 hours. "Stops" means that i don't receive any GPS point even though the location service icon is still on. Then when i get out i don't receive any points until I bring my application to foreground. I set the pausesLocationUpdatesAutomatically property to NO. So, everything

问题 Im quite new to iOS programming and now want to implement a periodic background synchronization to synchronize my server data with client data. What I want to achieve is comparable with Androids SyncAdapter where you can define a time interval (for example each 30 minutes) and the system will trigger the defined task automatically in the background. Until now I could not find such mechanism for Swift 3.0 so I need to ask if somone has experience or some hints for me how I can achieve this.