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【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
... map’s drawn view. The value is a list of lists containing the northwest and southeast coordinates of the current view in the form ((North West) (South East)).设置或获取地图的边界，值是一个包含了西北和东南坐标的嵌套列表，格式为((北西)(南东))CenterFromString地...
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?
...that are not marked as being in __block storage are retained by the block, and get released by the block when it is destroyed (when its retain count goes to 0). Here's the documentation on that: developer.apple.com/library/mac/documentation/Cocoa/Conceptual/…
– Ryan
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Overflow to left instead of right
...e number as the user types it. The text inside the div is aligned to right and incoming characters are added to right as the text grows to left.
...
How to equalize the scales of x-axis and y-axis in Python matplotlib?
... indeed works like charm. Could you please tell me what plt.plot(range(5)) and plt.gca().set_aspect('equal', adjustable='box') do, if you don't mind? Also, I notice that even if I don't have plt.draw(), the plot will still show up. Then what is the use of it?
– Sibbs Gambling
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How to keep environment variables when using sudo
When I use any command with sudo the environment variables are not there. For example after setting HTTP_PROXY the command wget works fine without sudo . However if I type sudo wget it says it can't bypass the proxy setting.
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String to LocalDate
... Also submitted an edit for the format "yyyy-MMM-dd". YYYY is year of era, and (more egregiously) DD is day of year.
– Spencer Kormos
Jan 5 '12 at 16:55
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Android Fragments: When to use hide/show or add/remove/replace?
...longer visible. So you could technically still interact with the fragment and reattach its UI later you need to. If you replace the fragment, the you are actually pulling it out of the container and it will go through all of the teardown events in the lifecycle (onPause, onStop, etc) and if for so...
java SSL and cert keystore
...Java keystore file containing an
application process's own certificate
and private key. On Windows, the
specified pathname must use forward
slashes, /, in place of backslashes.
javax.net.ssl.keyStorePassword - Password
to access the private key from the
keystore file specified by
...
EF LINQ include multiple and nested entities
... bool operator other list
Update
To learn more, download LinqPad and look through the samples.
I think it is the quickest way to get familiar with Linq and Lambda.
As a start - the difference between Select and Include is that that with a Select you decide what you want to return (aka pro...
call a static method inside a class?
...@Ian Dunn Put simply, $this only exists if an object has been instantiated and you can only use $this->method from within an existing object. If you have no object but just call a static method and in that method you want to call another static method in the same class, you have to use self::. So...