ilguzin’s gists

ilguzin / MyMapActivity.java

Created November 29, 2012 13:28

Simple way of making long tap event work in MapView. MapActivity class

	public class MyMapActivity extends MapActivity
	implements OnGestureListener {

	...

	private GestureDetector gestureDetector;



	@Override

ilguzin / ShowMapActivity.java

Created November 29, 2012 13:30

Simple way of making long tap event work in MapView. ShowMapActivity class

	public class ShowMapActivity extends MapActivity {



	...

	private long touchActionDownStartTime;

	private float histX;

ilguzin / set_height_to_ListView_wrapped_by_ScrollView.java

Last active December 12, 2015 04:28

The snippet gives you an ability to set ListView height according to elements number in it, when the ListView is placed inside ScrollView. Stolen from SO.

	class HackUtils {
	public static void setListViewHeightBasedOnChildren(ListView listView) {
	ListAdapter listAdapter = listView.getAdapter();
	if (listAdapter == null) {
	// pre-condition
	return;
	}

	int totalHeight = 0;
	for (int i = 0; i < listAdapter.getCount(); i++) {

ilguzin / pass_java_list_to_scala.scala

Created April 4, 2013 13:53

Calling Scala code from Java with java.util.List when Scala's List is expected

	// Implicit
	import scala.collection.JavaConverters._

	// For method:
	def doSomething(things: List[Thing]): List[Result] = { ... }

	// add the same method with another signature:
	def doSomething(things: java.util.List[Thing]): java.util.List[Result] =
	doSomething(things.asScala.toList).asJava

ilguzin / regexp_unpackaging.scala

Created April 8, 2013 18:48

regular expression vs patterns matching in Scala

	scala> val s = "Me Moscow 2012"
	s: String = some text 2012

	scala> val PersonLocation = """(.+) (.+) (.+)""".r
	PersonLocation: scala.util.matching.Regex = (.+) (.+) (.+)

	scala> val PersonLocation(person, city, year) = s
	person: String = Me
	city: String = Moscow
	year: String = 2012

ilguzin / scala_implicit_list_conversion

Last active December 16, 2015 00:38

Implicit conversions to work inside collections. Stolen from http://stackoverflow.com/questions/12447968/how-can-i-get-implicit-conversions-to-work-inside-collections

	Here are a few alternatives you might wish to consider:

	1. Use a view bound

	If it's possible to change the function that takes a List of Bs, this would be the simplest solution. Modify it to accept a List of things that can be converted to Bs. That is,

	def myfun(l: List[B]) = ...
	would become

	def myfun[X <% B](l: List[X]) = ...

ilguzin / mongo_unique_index_on_embedded_document

Last active December 16, 2015 02:59

As comes from official mongo documentation you cannot create unique index on fields from embedded documents. Here is a workaround for those using $push to append values to array of embedded documents.

	Mongo shell command

	> db.users.update(
	{ community:'Coomunity1',
	'users.login': {'$ne': 'Login1'}
	},
	{ $push:
	{ users: {login:'Login1', pwd:'*****'} }
	},
	{upsert: true})

ilguzin / implicits_create_and_import.scala

Created April 12, 2013 07:12

Useful way of injecting implicits in the scope. We add here a companion object with implicits for mongo database requests. Then make the object nested in the desired class by importing.

	object UserDaoImpl {

	object Implicits {

	implicit object AccountWriter extends BSONDocumentWriter[Account] {
	def write(acc: Account) = BSONDocument(
	"email" -> acc.email)
	}

	implicit object AccountReader extends BSONDocumentReader[Account] {

ilguzin / akka_custom_ser_config

Created April 25, 2013 20:46

Akka config for remoting + serialization cutomization

	akka {
	actor {
	provider = "akka.remote.RemoteActorRefProvider"
	serialize-messages = on

	serializers {
	proto = "akka.remote.serialization.ProtobufSerializer"
	}
	serialization-bindings {
	"scala.collection.immutable.List" = proto

ilguzin / socket_idle_timeout.java

Created June 5, 2013 08:44

The way to organize read timeout (read idle timeout) for socket connection with Netty. See. http://docs.jboss.org/netty/3.2/api/org/jboss/netty/handler/timeout/ReadTimeoutHandler.html

	public class MyPipelineFactory implements ChannelPipelineFactory {

	private final Timer timer;
	private final ChannelHandler timeoutHandler;

	public MyPipelineFactory(Timer timer) {
	this.timer = timer;
	this.timeoutHandler = new ReadTimeoutHandler(timer, 30), // timer must be shared.
	}

Denis Ilguzin ilguzin