Is there a way to pass parameters to a Runnable? [duplicate]

Question

I have a thread that uses a handler to post a runnable instance. it works nicely but I'm curious as to how I would pass params in to be used in the Runnable instance? Maybe I'm just not understanding how this feature works.

To pre-empt a "why do you need this" question, I have a threaded animation that has to call back out to the UI thread to tell it what to actually draw.

Answer 1

Simply a class that implements Runnable with constructor that accepts the parameter can do,

public class MyRunnable implements Runnable {   private Data data;   public MyRunnable(Data _data) {     this.data = _data;   }    @override   public void run() {     ...   } } 

You can just create an instance of the Runnable class with parameterized constructor.

MyRunnable obj = new MyRunnable(data); handler.post(obj); 

Answer 2

There are various ways to do it but the easiest is the following:

final int param1 = value1; final int param2 = value2; ... new Runnable() {     public void run() {         // use param1 and param2 here     } }