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How to check if a json key exists?
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JSONObject class has a method named "has":
http://developer.android.com/reference/org/json/JSONObject.html#has(java.lang.String)
Returns true if this object has a mapping for name. The mapping may be NULL.
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Error handling in C code
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Use setjmp.
http://en.wikipedia.org/wiki/Setjmp.h
http://aszt.inf.elte.hu/~gsd/halado_cpp/ch02s03.html
http://www.di.unipi.it/~nids/docs/longjump_try_trow_catch.html
#include <setjmp.h>
#include <stdio.h>
jmp_buf x;
void...
Android preferences onclick event
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android:action="android.intent.action.VIEW"
android:data="http://www.example.com"
/>
</PreferenceScreen>
to launch a specific activity:
<PreferenceScreen android:title="something">
<intent
android:action="android.intent.action.MAIN"
a...
Running a specific test case in Django when your app has a tests directory
The Django documentation ( http://docs.djangoproject.com/en/1.3/topics/testing/#running-tests ) says that you can run individual test cases by specifying them:
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Virtualbox “port forward” from Guest to Host [closed]
...change host port if you prefer
Go to host system and try it in browser:
http://127.0.0.1:8000
or your network ip address (find out on the host machine by running: ipconfig).
Network communication Guest -> Host
In this case port forwarding is not needed, the communication goes over the LAN bac...
Convert string to a variable name
... looking for.
assign("x", 5)
x
[1] 5
but buyer beware.
See R FAQ 7.21
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
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How to use glyphicons in bootstrap 3.0
...rch"></span>
Here is a helpful list of changes for Bootstrap 3: http://bootply.com/bootstrap-3-migration-guide
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Struct like objects in Java
...ct), then it's appropriate to make the class's instance variables public.
http://www.oracle.com/technetwork/java/javase/documentation/codeconventions-137265.html#177
http://en.wikipedia.org/wiki/Plain_old_data_structure
http://docs.oracle.com/javase/1.3/docs/guide/collections/designfaq.html#28
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Returning JSON from PHP to JavaScript?
...There is no obligation that the end result of that JSON will be emitted as HTTP response. The "add a header" information, while useful for one situation, is not going to help you if what you're doing with that JSON isn't simply "return it verbatim to the web page". The question didn't add clarificat...
How to center buttons in Twitter Bootstrap 3?
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According to the Twitter Bootstrap documentation: http://getbootstrap.com/css/#helper-classes-center
<!-- Button -->
<div class="form-group">
<label class="col-md-4 control-label" for="singlebutton"></label>
<div class="col-md-4 center-block...