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Download a file with Android, and showing the progress in a ProgressDialog
...Dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(true);
// execute this when the downloader must be fired
final DownloadTask downloadTask = new DownloadTask(YourActivity.this);
downloadTask.execute("the url to the file you want to download");
mProgressDialog....
Default constructor vs. inline field initialization
...ne ivar depends on another through a series of heuristic steps to execute, etc).
@Michael B said:
... I'd prefer to put all initialization code into those (and chain them) rather than splitting it up between constructors and field initializers.
MichaelB (I bow to the 71+ K rep) makes perfect ...
How do I find where an exception was thrown in C++?
...32 structured exception handling (used by the instrumentation) for logging etc.
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var functionName = function() {} vs function functionName() {}
...nction declaration inside a control structure like try, if, switch, while, etc., like this:
if (someCondition) {
function foo() { // <===== HERE THERE
} // <===== BE DRAGONS
}
And since they're processed before step-by-step code is run, it's tricky to know what ...
Execution of Python code with -m option or not
...sion 3.4):
python -Im pdb
usage: pdb.py [-c command] ... pyfile [arg] ...
etc...
from the docs:
-I
Run Python in isolated mode. This also implies -E and -s. In isolated mode sys.path contains neither the script’s directory nor the user’s site-packages directory. All PYTHON* environme...
@property retain, assign, copy, nonatomic in Objective-C
...p track of them. These classes include NSTextView, NSFont and NSColorSpace,etc. If you need to use a weak reference to one of these classes, you must use an unsafe reference.
An unsafe reference is similar to a weak reference in that it doesn’t keep its related object alive, but it won’t be s...
Difference between timestamps with/without time zone in PostgreSQL
...tores a point on the UTC time line. How it looks (how many hours, minutes, etc.) depends on your time zone, but it always refers to the same "physical" instant (like the moment of an actual physical event). The
input is internally converted to UTC, and that's how it's stored. For that, the offset of...
When do we have to use copy constructors?
...creating a separate worker thread
allocating a separate OpenGL framebuffer
etc
Self-registering objects
Consider a class where all objects - no matter how they have been constructed - MUST be somehow registered. Some examples:
The simplest example: maintaining the total count of currently exi...
Writing your own STL Container
...mplistic, skipping over many concepts like const_iterator, validity checks etc.
Code is runnable out of the box.
#include <iostream>
#include <string>
#include <vector>
template<typename T>
struct It
{
std::vector<T>& vec_;
int pointer_;
It(std::vec...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
...idea of thinking of 11011 as the polynomial with coefficients [1,1,0,1,1], etc. This is a clever and often useful idea, which goes all the way back to Euler. [See Wilf's awesome book "generatingfunctionology" for a modern exposition: math.upenn.edu/~wilf/DownldGF.html ] So it depends on whether the ...