Android AsyncTask & starting new Activities

Question

I've been having some issues with starting a new activity once an AsyncTask has completed. I've read that I can put code like this:

protected void onPostExecute(String result) {
    super.onPostExecute(result);
    if (progress.isShowing()) {
        if (result.equals("true")) {
            progress.dismiss();
            activity.startActivity(new Intent(activity, Main.class));
        }
    }
}

But basically that just crashes and it's always on the line which it's starting the Activity, It comes up with the error NullPointerException but I can't figure out why?

Any idea?

Thanks Chris

Answer 1

检查以确保activity不为null ，因为它可能是NullPointerException的原因。