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How to check internet access on Android? InetAddress never times out
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- does not work on some old devices (Galays S3, etc.), it blocks a while if no internet is available.
B) Connect to a Socket on the Internet (advanced)
// TCP/HTTP/DNS (depending on the port, 53=DNS, 80=HTTP, etc.)
public boolean isOnline() {
try {
int timeoutMs = 1500;
Socke...
How to decide font color in white or black depending on background color?
...ine the overall intensity of the color and choose the corresponding text.
if (red*0.299 + green*0.587 + blue*0.114) > 186 use #000000 else use #ffffff
The threshold of 186 is based on theory, but can be adjusted to taste. Based on the comments below a threshold of 150 may work better for you.
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Diff output from two programs without temporary files
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Use <(command) to pass one command's output to another program as if it were a file name. Bash pipes the program's output to a pipe and passes a file name like /dev/fd/63 to the outer command.
diff <(./a) <(./b)
Similarly you can use >(command) if you want to pipe something into...
Java: Get first item from a collection
If I have a collection, such as Collection<String> strs , how can I get the first item out? I could just call an Iterator , take its first next() , then throw the Iterator away. Is there a less wasteful way to do it?
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Difference between $.ajax() and $.get() and $.load()
What is the difference between $.ajax() and $.get() and $.load() ?
9 Answers
9
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How can I create a link to a local file on a locally-run web page?
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You need to use the file:/// protocol (yes, that's three slashes) if you want to link to local files.
<a href="file:///C:\Programs\sort.mw">Link 1</a>
<a href="file:///C:\Videos\lecture.mp4">Link 2</a>
These will never open the file in your local applications auto...
How do you reindex an array in PHP?
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If you want to re-index starting to zero, simply do the following:
$iZero = array_values($arr);
If you need it to start at one, then use the following:
$iOne = array_combine(range(1, count($arr)), array_values($arr));
H...
How do I quickly rename a MySQL database (change schema name)?
...ne;
Notes:
There is no space between the option -p and the password. If your database has no password, remove the -u username -ppassword part.
If some table has a trigger, it cannot be moved to another database using above method (will result Trigger in wrong schema error). If that is the case...
Why the switch statement cannot be applied on strings?
...ered by the history of the compiler. At the time they wrote it, C was glorified assembly and hence switch really was a convenient branch table.
– JaredPar
Mar 16 '09 at 13:34
121
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What is the Scala annotation to ensure a tail recursive function is optimized?
...unction. Do you just put it in front of the declaration? Does it also work if Scala is used in scripting mode (for instance using :load <file> under REPL)?
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