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Detect whether there is an Internet connection available on Android [duplicate]
...e, but does not check that device is connected to the internet. To really know about active internet connection, you should to use HttpURLConnection to some host, ping some host (e.g. google.com) or try to use InetAddress.getByName(hostName).isReachable(timeOut)
– Dimon
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Should each and every table have a primary key?
... thinking I wouldn't need one, I've ended up going back and adding one. I now create even my join tables with an auto-generated identity field that I use as the primary key.
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Browser detection in JavaScript? [duplicate]
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Would be nice to know all the results this function returns...
– Diego
Jan 27 '14 at 17:12
33
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Save ArrayList to SharedPreferences
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I'm sorry, I don't have an Android SDK to test it now, but take a look here: benjii.me/2010/04/deserializing-json-in-android-using-gson . You should iterate over the json array and do what they do there for each object, hopefully I'll be able to post an edit to my answer wit...
Get epoch for a specific date using Javascript
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You can also use Date.now() function.
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sql primary key and index
...ate your own alternate index on that column, then drop the default index.
Now for the fun part--when do you NOT want a unique primary key index? You don't want one, and can't tolerate one, when your table acquires enough data (rows) to make the maintenance of the index too expensive. This varies ...
Regex - Does not contain certain Characters
...special characters: the shell interprets some of them. Look to see if you now have a file named ']+$' in your directory. Put the entire regex inside single quotes to make it work.
– Ned Batchelder
Sep 11 '17 at 23:50
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Importing data from a JSON file into R
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x$user$name, x$user$user_id should now be x$user['name'], x$user['user_id']. Also, m <- do.call(rbind, m) might be a better way of converting the list to a matrix.
– jbaums
Oct 10 '13 at 1:16
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How do you add Boost libraries in CMakeLists.txt?
... can also use FIND_PACKAGE(Boost REQUIRED COMPONENTS system) if you don't know the exact version of boost to use
– smac89
Aug 17 '17 at 6:39
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Python string class like StringBuilder in C#?
...(str)
def __str__(self):
return self._file_str.getvalue()
now using it
sb = StringBuilder()
sb.Append("Hello\n")
sb.Append("World")
print sb
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