Simple download JSON example using koush/Ion

ionExample.java

Ion.with(this, "http://your-url.com/file.json")
  .asJsonObject()
  .setCallback(new FutureCallback<JsonObject>() {
    @Override
    public void onCompleted(Exception e, JsonObject result) {
        if( e!=null ) {} // do stuff on fail
        if( json!=null ) {} // do stuff on success
    }
});