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App Inventor 2 中的响应式设计 · App Inventor 2 中文网
... and animation
Responsive design and Google Play
One tricky issue in designing apps is making apps that look good on devices with screens of differing sizes. For example, apps designed for a given phone should also look good on tablets or phones with a different screen size. Making ...
What is the difference between javac and the Eclipse compiler?
Is Eclipse's Java compiler just a wrapper around the same core that the javac program is wrapped around, or is it a separate compiler altogether? If the latter, why would they reinvent the wheel?
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Is it possible to disable floating headers in UITableView with UITableViewStylePlain?
...prefer it if they didn't float but stayed static as they do when the style is set to UITableViewStyleGrouped .
29 Answers
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Differences between cookies and sessions?
...ion. Sessions have a unique identifier that maps them to specific users. This identifier can be passed in the URL or saved into a session cookie.
Most modern sites use the second approach, saving the identifier in a Cookie instead of passing it in a URL (which poses a security risk). You are probab...
How do I check if a Sql server string is null or empty
...o check for data, but ignore it if it's null or empty. Currently the query is as follows...
18 Answers
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How to remove time portion of date in C# in DateTime object only?
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edited Mar 13 '13 at 6:48
Vishal Suthar
15.8k22 go...
Test for existence of nested JavaScript object key
...t step by step if you don't want a TypeError because if one of the members is null or undefined, and you try to access a member, an exception will be thrown.
You can either simply catch the exception, or make a function to test the existence of multiple levels, something like this:
function checkN...
How can I disable logging while running unit tests in Python Django?
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logging.disable(logging.CRITICAL)
will disable all logging calls with levels less severe than or equal to CRITICAL. Logging can be re-enabled with
logging.disable(logging.NOTSET)
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Delete directory with files in it?
...ays.
Before deleting the folder, delete all its files and folders (and this means recursion!). Here is an example:
public static function deleteDir($dirPath) {
if (! is_dir($dirPath)) {
throw new InvalidArgumentException("$dirPath must be a directory");
}
if (substr($dirPath, ...
Choosing the default value of an Enum type without having to change values
In C#, is it possible to decorate an Enum type with an attribute or do something else to specify what the default value should be, without having the change the values? The numbers required might be set in stone for whatever reason, and it'd be handy to still have control over the default.
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