Sort collection by object property in Java

A lot of time, we are sorting something in our applications. Sort numbers, sort string, etc. What about when we are sorting objects with their property. For example, you have a person class and you have a list of persons. And you need to sort this list by age property of person.

Marker Clusterer for Google Maps on Android

Google Maps Android API v2 is a great library for Android developers to create maps application. It is very clear and easy to use. Creating map items and events are very easy. But, it has no facility for marker clustering. There are some samples on the net for clustering. Here is my solution about that.

Touchable Google Maps in Android

Google Maps Android API v2 is a great library for Android developers to create maps application. It is very clear and easy to use. Creating map items and events are very easy. But, when i was working on it, there is no touch event on the map. What happens if user tap the map, zoom the map, etc. What is the new position of camera? What is the new zoom level?