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);