How can you pass multiple primitive parameters to AsyncTask?

Question

There are related questions, such as How can I pass in 2 parameters to a AsyncTask class? , but I ran into the difficulty of trying in vain to pass multiple primitives as parameters to an AsyncTask, so I want to share what I discovered. This subtlety is not captured in the existing questions and answers, so I want to help out anyone who runs into the same problem as I did and save them the pain.

The question is this: I have multiple primitive parameters (e.g. two longs) that I want to pass to an AsyncTask to be executed in the background--how can it be done? (My answer...after struggling with this for awhile...can be found below.)

Answer 1

Just wrap your primitives in a simple container and pass that as a parameter to AsyncTask, like this:

private static class MyTaskParams {     int foo;     long bar;     double arple;      MyTaskParams(int foo, long bar, double arple) {         this.foo = foo;         this.bar = bar;         this.arple = arple;     } }  private class MyTask extends AsyncTask<MyTaskParams, Void, Void> {     @Override     protected void doInBackground(MyTaskParams... params) {         int foo = params[0].foo;         long bar = params[0].bar;         double arple = params[0].arple;         ...     } } 

Call it like this:

MyTaskParams params = new MyTaskParams(foo, bar, arple); MyTask myTask = new MyTask(); myTask.execute(params); 

Answer 2

Another way: You just need add MyTask constructor in your MyTask class:

private class MyTask extends AsyncTask<String, Void, Void> {     int foo;     long bar;     double arple;      MyTask(int foo, long bar, double arple) {           // list all the parameters like in normal class define         this.foo = foo;         this.bar = bar;         this.arple = arple;     }     ......   // Here is doInBackground etc. as you did before } 

Then call

new MyTask(int foo, long bar, double arple).execute(); 

A second way like David Wasser's Answer.