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How to construct a WebSocket URI relative to the page URI?
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Using the Window.URL API - https://developer.mozilla.org/en-US/docs/Web/API/Window/URL
Works with http(s), ports etc.
var url = new URL('/path/to/websocket', window.location.href);
url.protocol = url.protocol.replace('http', 'ws');
url.hre...
Best practices for in-app database migration for Sqlite
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I maintain an application that periodically needs to update a sqlite database and migrate old databases to the new schema and here's what I do:
For tracking the database version, I use the built in user-version variable that sqlite provides (sqlite does nothing w...
CORS Access-Control-Allow-Headers wildcard being ignored?
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Support for wildcards in the Access-Control-Allow-Headers header was added to the living standard only in May 2016, so it may not be supported by all browsers. On browser which don't implement this yet, it must be an exact match: https://www.w3.org/TR/2014/REC-cors-201...
How to disable action bar permanently
...which gives custom themes and no action bar, is to create a SuperClass for all activities in my project and in it's onCreate() call the following line of code -
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
It always work for me. The only issue in this approach is, you'll see action bar fo...
Efficient way to remove ALL whitespace from String?
I'm calling a REST API and am receiving an XML response back. It returns a list of a workspace names, and I'm writing a quick IsExistingWorkspace() method. Since all workspaces consist of contiguous characters with no whitespace, I'm assuming the easiest way to find out if a particular workspace i...
Is it better practice to use String.format over string Concatenation in Java?
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They are all bad practice. Use StringBuilder.
– Amir Raminfar
Aug 11 '11 at 16:37
10
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How can I safely encode a string in Java to use as a filename?
...m with escape sequences.
The reverse of the above encoding should be equally straight-forward to implement.
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Why does the MongoDB Java driver use a random number generator in a conditional?
...k && Math.random() <= 0.1)
return res;
The commit that originally introduced this logic had
if (_ok == true) {
_logger.log( Level.WARNING , "Server seen down: " + _addr, e );
} else if (Math.random() < 0.1) {
_logger.log( Level.WARNING , "Server seen down: " + _addr );
}
—a...
launch sms application with an intent
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To start launch the sms activity all you need is this:
Intent sendIntent = new Intent(Intent.ACTION_VIEW);
sendIntent.setData(Uri.parse("sms:"));
You can add extras to populate your own message and such like this
sendIntent.putExtra("sms_body", ...
What are best practices for validating email addresses on iOS 2.0
... ; "]", or "\"
Yes, that means +, ', etc are all legit.
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