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Officially, what is typename for?
...
Following is the quote from Josuttis book:
The keyword typename was introduced to
specify that the identifier that
follows is a type. Consider the
following example:
template <class T>
Class MyClass
{
typename T::SubType * ptr;
...
};
Here, typename is used to clarify t...
Using setImageDrawable dynamically to set image in an ImageView
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Try this,
int id = getResources().getIdentifier("yourpackagename:drawable/" + StringGenerated, null, null);
This will return the id of the drawable you want to access...
then you can set the image in the imageview by doing the follow...
AsyncTask Android example
... protected String doInBackground(Void... params) {
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// We were cancelled; stop sleeping!
}
...
Why doesn't await on Task.WhenAll throw an AggregateException?
...ere that with new async/await keywords, they unwrap the AggregateException into the actual exception.
So, in catch block, you get the actual exception and not the aggregated one. This helps us write more natural and intuitive code.
This was also needed for easier conversion of existing code into usi...
add column to mysql table if it does not exist
...for the schema. Just a table with a single column and single row, with an integer indicating which revision is current in effect. When you update the schema, increment the number.
Another solution would be to just try the ALTER TABLE ADD COLUMN command. It should throw an error if the column alr...
Allow user to select camera or gallery for image
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You'll have to create your own chooser dialog merging both intent resolution results.
To do this, you will need to query the PackageManager with PackageManager.queryIntentActivities() for both original intents and create the final list of possible Intents with one new Intent for eac...
NSDate get year/month/day
...e information.
Despite its name, NSDate in and of itself simply marks a point in machine time, not a date. There's no correlation between the point in time specified by an NSDate and a year, month, or day. For that, you have to refer to a calendar. Any given point in time will return different date...
Single quotes vs. double quotes in C or C++
...er literal is char, but note that in C, the type of a character literal is int, that is sizeof 'a' is 4 in an architecture where ints are 32bit (and CHAR_BIT is 8), while sizeof(char) is 1 everywhere.
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Why does one often see “null != variable” instead of “variable != null” in C#?
...ment requires a Boolean expression to start with, and the type of "x=5" is Int32, not Boolean.
I suggest that if you see this in your colleagues' code, you educate them in the ways of modern languages, and suggest they write the more natural form in future.
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Should I call Close() or Dispose() for stream objects?
...h as Stream , StreamReader , StreamWriter etc implements IDisposable interface. That means, we can call Dispose() method on objects of these classes. They've also defined a public method called Close() . Now that confuses me, as to what should I call once I'm done with objects? What if I ...