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What is the intent of the methods getItem and getItemId in the Android class BaseAdapter?
...operations on(update/delete/etc).
So instead of accessing the ID from the raw data object like myListData.get(position).getId() you can use adapter.getItemId(position).
One example of where i've felt like I needed to use these methods was in a project using the SeparatedListViewAdapter. This adapt...
Enums and Constants. Which to use when?
...
Use enums when you want to define a range of values that something can be. Colour is an obvious example like:
public enum Colour
{
White,
Red,
Blue
}
Or maybe a set of possible things like:
(Example I stole from here as I'm lazy)
[FlagsAttribute...
What is causing this ActiveRecord::ReadOnlyRecord error?
...ork around.
Using find_by_sql is not really an alternative as it returns raw row/column data, not ActiveRecords. You have two options:
Force the instance variable @readonly to false in the record (hack)
Use :include => :card instead of :join => :card
Rails 2.3.4 and above
Most of the a...
What does Provider in JAX-RS mean?
...on gives you the ability to examine incoming and outgoing messages at the raw XML level, and in this way Provider is the counterpart to Dispatch on the client.
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Fragment or Support Fragment?
...ncluded in your application. Each of these libraries supports
a specific range of Android platform versions and set of features.
This guide explains the important features and version support
provided by the Support Libraries to help you decide which of them you
should include in your app...
Scala: What is the difference between Traversable and Iterable traits in Scala collections?
...oreach, to traverse all elements at once without stopping.
Something like Range(1, 10) needs to have only 2 integers as state as a Traversable. But Range(1, 10) as an Iterable gives you an iterator which needs to use 3 integers for state, one of which is an index.
Considering that Traversable also...
How to safely open/close files in python 2.4
...name)
print txt.read()
txt.close()
print "Change the file name"
file_again=raw_input('>')
print "New file name %r" %(file_again)
txt_again=open(file_again)
print txt_again.read()
txt_again.close()
It's necessary to how many times you opened file have to close that times.
...
Algorithm to return all combinations of k elements from n
..., with minor changes – I used the index of the sets rather than a number range to represent the set, so we are always working from 0...n.
Note:
Since combinations are unordered, {1,3,2} = {1,2,3} --we order them to be lexicographical.
This method has an implicit 0 to start the set for the first ...
Adding a regression line on a ggplot
... regression line:
fit: your fit of a logistic regression curve
#Create a range of doses:
mm <- data.frame(DOSE = seq(0, max(data$DOSE), length.out = 100))
#Create a new data frame for ggplot using predict and your range of new
#doses:
fit.ggplot=data.frame(y=predict(fit, newdata=mm),x=mm$DOSE)...
Forward declaring an enum in C++
...m type will be determined by the compiler to be any type that will fit the range of values you have for your enum.
What does that mean?
It means that your enum's underlying type cannot be fully determined until you have all of the values of the enum defined. Which mans you cannot separate the d...