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Client-server synchronization pattern / algorithm?
...eral use cases.
Synchronize changes. Your change-log (or delta history) approach looks good for this. Clients send their deltas to the server; server consolidates and distributes the deltas to the clients. This is the typical case. Databases call this "transaction replication".
Client has lost...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
创建 Apps 首页 关于我们 关于我们 发布日志 服务条款 教育 中文教程 中文社区 反馈 我要反馈 var _hmt = _hmt || []; (function() ...
Cannot change version of project facet Dynamic Web Module to 3.0?
I am using maven to create a dynamic webapp in Eclipse. I added some folders like src/test/java and src/test/resources . Also I changed the library in Java Build Path to obtain the JavaSE-1.7. It's all OK up to here.
...
Simulate airplane mode in iPhone Simulator
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It's harder than it sounds, though our team has asked Apple for similar functionality. The problem is that apps running in the simulator are really Mac apps. The iPhone Simulator doesn't emulate the iPhone; it's just an environment for Mac apps to link against and look like an i...
How can I make the Android emulator show the soft keyboard?
... found out how to do this on the Android emulator itself (Menu, "Settings" App - not the settings of the emulator outside). All you need to do is:
open settings app -> Language & Input -> Go to the "Keyboard & Input Methods -> click Default
This will bring up a Dialog in which case ...
使用Activity启动器组件 · App Inventor 2 中文网
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使用Ac...
How to enable/disable bluetooth programmatically in android
... permission to turn on Bluetooth. The enable() method is provided only for applications that include a user interface for changing system settings, such as a "power manager" app. What does it mean? For ex. I made a little app from your code and it worked. But if I want to upload to Play Store, it wo...
Deleting all pending tasks in celery / rabbitmq
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From the docs:
$ celery -A proj purge
or
from proj.celery import app
app.control.purge()
(EDIT: Updated with current method.)
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Runtime vs. Compile time
...specially for people without much background in programming languages. To approach this problem, I find it helpful to ask
What invariants does the program satisfy?
What can go wrong in this phase?
If the phase succeeds, what are the postconditions (what do we know)?
What are the inputs and output...
iOS Detection of Screenshot?
The app Snapchat , on the App Store, is an app that lets you share pictures with a self-destruct on them. You can only view the pics for X seconds. If you attempt to take a screenshot while the picture is showing using the home-power key combo, it will tell the sender you tried to take a screenshot...