This tutorial explains how to download Image using AsyncTask in Android. The example below download image while showing progress bar while during download.
Understanding Android AsyncTask
Async task enables you to implement MultiThreading without get Hands dirty into threads. AsyncTask enables pro...
Let's say you need to implement an automatic search box, but the search operation is somewhat costly, like sending a web request or hitting up a database. You may want to limit the amount of search being done.
For example, the user is typing "C# Reactive Extensions" in the search box :
I...
We can bind a class as a Singleton:
public function register()
{
App::singleton('my-database', function()
{
return new Database();
});
}
This way, the first time an instance of 'my-database' will be requested to the service container, a new instance will be created. Al...
First define the service (in this case it uses the factory pattern):
.factory('dataService', function() {
var dataObject = {};
var service = {
// define the getter method
get data() {
return dataObject;
},
// define the setter method
...
import flash.net.URLRequest;
import flash.media.Sound;
import flash.events.Event;
var req:URLRequest = new URLRequest("filename.mp3");
var snd:Sound = new Sound(req);
snd.addEventListener(Event.COMPLETE, function(e: Event)
{
snd.play(0, int.MAX_VALUE); // There is no way to...
File streams are buffered by default, as are many other types of streams. This means that writes to the stream may not cause the underlying file to change immediately. In oder to force all buffered writes to take place immediately, you can flush the stream. You can do this either directly by invokin...
To filter a slice without allocating a new underlying array:
// Our base slice
slice := []int{ 1, 2, 3, 4 }
// Create a zero-length slice with the same underlying array
tmp := slice[:0]
for _, v := range slice {
if v % 2 == 0 {
// Append desired values to slice
tmp = append(tmp, ...
rgdal
ESRI shape files can easily be imported into R by using the function readOGR() from the rgdal package.
library(rgdal)
shp <- readORG(dsn = "/path/to/your/file", layer = "filename")
It is important to know, that the dsn must not end with / and the layer does not all...
explode and strstr are simpler methods to get substrings by separators.
A string containing several parts of text that are separated by a common character can be split into parts with the explode function.
$fruits = "apple,pear,grapefruit,cherry";
print_r(explode(",",$fruits))...
The normal orElse method takes an Object, so you might wonder why there is an option to provide a Supplier here (the orElseGet method).
Consider:
String value = "something";
return Optional.ofNullable(value)
.orElse(getValueThatIsHardToCalculate()); // returns "some...
A session is usually obtained using sessionmaker, which creates a Session class unique to your application. Most commonly, the Session class is bound to an engine, allowing instances to use the engine implicitly.
from sqlalchemy.orm import sessionmaker
# Initial configuration arguments
Session ...
The <algorithm> header provides a number of useful functions for working with sorted vectors.
An important prerequisite for working with sorted vectors is that the stored values are comparable with <.
An unsorted vector can be sorted by using the function std::sort():
std::vector<int&...
If it is important for a sequence of numbers generated by random() to differ, it is a good idea to specify a seed with randomSeed():
void setup() {
Serial.begin(9600);
// If analog pin 0 is left unconnected, analogRead(0) will produce a
// different random number each time the ...
You can also use regular expressions to split a string. For example,
import re
data = re.split(r'\s+', 'James 94 Samantha 417 Scarlett 74')
print( data )
# Output: ['James', '94', 'Samantha', '417', 'Scarlett', '74']
If you have a string that contains Python literals, such as strings, floats etc, you can use ast.literal_eval to evaluate its value instead of eval. This has the added feature of allowing only certain syntax.
>>> import ast
>>> code = """(1, 2, {'foo': 'bar'})"...
Let's say we have the following function:
(defn nat-num-count [nums] (count (remove neg? nums)))
We can write a spec for this function by defining a function spec of the same name:
(clojure.spec/fdef nat-num-count
:args (s/cat :nums (s/coll-of number?))
:ret integer?
...
Assuming we want to modify bit n of an integer primitive, i (byte, short, char, int, or long):
(i & 1 << n) != 0 // checks bit 'n'
i |= 1 << n; // sets bit 'n' to 1
i &= ~(1 << n); // sets bit 'n' to 0
i ^= 1 << n; // toggles the value of bit 'n'
Us...
