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NullPointerException accessing views in onCreate()
...n the activity layout (activity_main.xml). onCreate() is too early in the lifecycle to find it in the activity view hierarchy, and a null is returned. Invoking a method on null causes the NPE.
The preferred solution is to move the code to the fragment onCreateView(), calling findViewById() on the i...
Psql list all tables
I would like to list all tables in the liferay database in my PostgreSQL install. How do I do that?
6 Answers
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Copy folder structure (without files) from one location to another
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This solutions won't work if you have spaces in your directory names.
– Jealie
Mar 11 '15 at 20:35
33
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source command not found in sh shell
...s used which does not support source. Most shells use . instead of source. If you cannot edit the script, try to change the shell which runs it.
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how to deal with google map inside of a hidden div (Updated picture)
...yself and here's how I approached it. Pretty straight forward, let me know if you need any clarification
HTML
<div id="map_canvas" style="width:700px; height:500px; margin-left:80px;" ></div>
<button onclick="displayMap()">Show Map</button>
CSS
<style type="text/css"&...
Show diff between commits
...
Try
git diff k73ud^..dj374
to make sure to include all changes of k73ud in the resulting diff.
git diff compares two endpoints (instead of a commit range).
Since the OP want to see the changes introduced by k73ud, he/she needs to d...
How to perform element-wise multiplication of two lists?
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On the other hand, if they want to do anything else beyond the trivial case here the OP would be well advised to use Numpy.
– Henry Gomersall
Apr 22 '12 at 20:41
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Passing multiple error classes to ruby's rescue clause in a DRY fashion
...operator *.
EXCEPTIONS = [FooException, BarException]
begin
a = rand
if a > 0.5
raise FooException
else
raise BarException
end
rescue *EXCEPTIONS
puts "rescued!"
end
If you are going to use a constant for the array as above (with EXCEPTIONS), note that you cannot define it w...
Are empty HTML5 data attributes valid?
...like to write a simple jQuery plugin that displays inline modals under specified elements. My idea is for the script to auto-init based on data attributes specified on elements.
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Java Class that implements Map and keeps insertion order?
... remove, according to the Javadocs, while LinkedHashMap is O(1) for each.
If your API that only expects a predictable sort order, as opposed to a specific sort order, consider using the interfaces these two classes implement, NavigableMap or SortedMap. This will allow you not to leak specific imple...