android while loop alternative

Question

This is my first Android application and I am finding troubles with while loop, I am trying to use a while loop on my Android application but the application freezes.

What I'm trying to do is track the user location (using onlocationChanged) and keep querying on the location until the query returns a result. It's a GIS application so I am going to describe the application behavior: the application keeps tracking the user position using a listener "onLocationChangedListener" and store it in a variable "myPosition". I am using a boolean"noResults=true". I will use a method "query(myPosition)" in the while loop, this method has a callback that when a result is found, and changes a boolean "noResults" to false. the loop will keep on until "noResults" is false (that means query's callback changed the boolean's value)

, here's what I did:

while(noResults)
{
//myPosition keeps changing 
      query(myPosition);
//query has a callback that when a result is found it changes noResults to false
}

Answer 1

I resolved the problem using a "Handler" that query the Feature Layer every 5 seconds, this stops the main thread from generating application not responding error:

   Handler m_handler=new Handler();
    Runnable m_runnable;
    m_runnable = new Runnable(){
   public void run() {

  //query code here
m_handler.postDelayed(m_runnable, 5000);

    }
   };
  m_handler.postDelayed(m_runnable, 0);