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Uses for Optional
... so, I'm pretty happy with the new API changes. One area I'm still not confident in is when to use Optional . I seem to swing between wanting to use it everywhere something may be null , and nowhere at all.
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How do I access call log for android?
...ellybean (4.1) you need the following permission:
<uses-permission android:name="android.permission.READ_CALL_LOG" />
Code:
Uri allCalls = Uri.parse("content://call_log/calls");
Cursor c = managedQuery(allCalls, null, null, null, null);
String num= c.getString(c.getColumnIndex(CallLog.Cal...
How to quit android application programmatically
I Found some codes for quit an Android application programatically. By calling any one of the following code in onDestroy() will it quit application entirely?
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In JavaScript can I make a “click” event fire programmatically for a file input element?
...ow to trigger file input.
The only convenient alternative is to create a "hidden" file input (using opacity, not "hidden" or "display: none"!) and afterwards create the button "below" it. In this way the button is seen but on user click it actually activates the file input.
Hope this helps! :)
&l...
How can I filter a Django query with a list of values?
...n you can't use =.
The sql query will be like SELECT * FROM mytable WHERE ids=[1, 3, 6, 7, 9] which is not true. You have to use in operator for this so you query will be like SELECT * FROM mytable WHERE ids in (1, 3, 6, 7, 9) for that Django provide __in operator.
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What is the pythonic way to avoid default parameters that are empty lists?
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Existing answers have already provided the direct solutions as asked for. However, since this is a very common pitfall for new Python programmers, it worth to add the explanation why python behaves this way, which is nicely summarized in "the Hitchhikers Guid...
PostgreSQL: insert from another table
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Just supply literal values in the SELECT:
INSERT INTO TABLE1 (id, col_1, col_2, col_3)
SELECT id, 'data1', 'data2', 'data3'
FROM TABLE2
WHERE col_a = 'something';
A select list can contain any value expression:
But the expressions in the select list do not have to reference any co...
Is JavaScript guaranteed to be single-threaded?
...d question. I'd love to say “yes”. I can't.
JavaScript is usually considered to have a single thread of execution visible to scripts(*), so that when your inline script, event listener or timeout is entered, you remain completely in control until you return from the end of your block or functio...
Why does ASP.NET webforms need the Runat=“Server” attribute?
....
It continues:
If <runat=client> was required for all client-side tags, the parser would need to parse all tags and strip out the <runat=client> part.
He continues:
Currently,
If my guess is correct, the parser
simply ignores all text (tags or no
tags) unless it is a...
Invalidating JSON Web Tokens
...ing over from a cookie based session approach (by this, I mean, storing an id to a key-value store containing user sessions in a user's browser) to a token-based session approach (no key-value store) using JSON Web Tokens (jwt).
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