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Android: How can I validate EditText input?
I need to do form input validation on a series of EditTexts. I'm using OnFocusChangeListeners to trigger the validation after the user types into each one, but this doesn't behave as desired for the last EditText.
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How do I display the current value of an Android Preference in the Preference summary?
This must come up very often.
34 Answers
34
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Why use multiple columns as primary keys (composite primary key)
...elopers that are not sql developers or sql DBA's and don't spend all their time in sql. Even in pure sql I'd rather have a meaningless auto-generated key as the primary key when joining than have to remember to pass n bits of data around being the natural key. You're welcome to your viewpoint, but w...
Dynamic Anonymous type in Razor causes RuntimeBinderException
...t access internal members),
instead of letting you do what the CLR
runtime allows.
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adding header to python requests module
Earlier I used httplib module to add a header in the request. Now I am trying the same thing with the requests module.
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Using awk to print all columns from the nth to the last
This line worked until I had whitespace in the second field.
24 Answers
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How to insert a text at the beginning of a file?
So far I've been able to find how to add a line at the beginning of a file but that's not exactly what I want. I'll show it on a example
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When and why JPA entities should implement Serializable interface?
... be deserialized and activated (assuming they have not expired in the mean time) when the application reload is completed.
In order to successfully restore the state of session attributes, all such attributes MUST implement the java.io.Serializable interface.
So, if the entity is stored in the Http...
OS detecting makefile
I routinely work on several different computers and several different operating systems, which are Mac OS X, Linux, or Solaris. For the project I'm working on, I pull my code from a remote git repository.
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In Javascript, how to conditionally add a member to an object?
... @Andrew, that answer requires ES6, which did not exist at the time I wrote mine.
– Frédéric Hamidi
Nov 24 '16 at 17:00
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