大约有 47,000 项符合查询结果（耗时：0.0779秒） [XML]
How to check if AlarmManager already has an alarm set?
...o check if a particular alarm (registered via AlarmManager) is already set and running. Results from google seem to indicate that there is no way to do this. Is this still correct? I need to do this check in order to advise the user before any action is taken to create a new alarm.
...
What data is stored in Ephemeral Storage of Amazon EC2 instance?
I am trying to stop a Amazon EC2 instance and get the warning message
4 Answers
4
...
Remove all child elements of a DOM node in JavaScript
... will be faster than innerHTML as browsers won't invoke their HTML parsers and will instead immediately replace all children of the element with a single #text node.
doFoo.onclick = () => {
const myNode = document.getElementById("foo");
myNode.textContent = '';
}
<div id='foo' st...
Why are my basic Heroku apps taking two seconds to load?
... gets unloaded (from the server memory).
On the first hit it gets loaded and stays loaded until some time passes without anyone accessing it.
This is done to save server resources. If no one uses your app why keep resources busy and not let someone who really needs use them ?
If your app has a ...
Print an integer in binary format in Java
I have a number and I want to print it in binary. I don't want to do it by writing an algorithm, Is there any built-in function for that in Java?
...
Why should casting be avoided? [closed]
...as possible since I am under the impression that it's poor coding practice and may incur a performance penalty.
14 Answers...
Is the primary key automatically indexed in MySQL?
...implicit when defining the primary key? Is the answer the same for MyISAM and InnoDB?
9 Answers
...
Can a foreign key be NULL and/or duplicate?
...als. Suppose further that each proposal only has one sales person assigned and one client. So your proposal table would have two foreign keys, one with the client ID and one with the sales rep ID. However, at the time the record is created, a sales rep is not always assigned (because no one is fre...
How do I detect if software keyboard is visible on Android Device or not?
Is there a way in Android to detect if the software (a.k.a. "soft") keyboard is visible on screen?
30 Answers
...
How to Git stash pop specific stash in 1.8.3?
...ash@{1} is ambiguous?" for some detailed hints of what may be going wrong, and how to work around it in various shells and platforms.
git stash list
git stash apply stash@{n}
git stash apply version
share
|
...