Predictive Input turned off but still word suggestion box pops up

I could turn off Predictive Input by NO_COMPLEX_INPUT. So while I am typing into EditField, no transformation kicks in. Happy about that.

But still word suggestion box pops up when I type in "bo" and click Trackpad. How can I prevent this?

I noticed right after I typed 'o', dotted line appears under the "bo" which probably indicates it has some suggestion, then suggestion box appears开发者_高级运维 on click. Also when suggestion box appeared, trackwheelClick() is not being called.

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I found NON_SPELLCHECKABLE prevents word suggestion:

editUsername = new EditField("" , "", 25, EditField.NON_SPELLCHECKABLE | EditField.NO_COMPLEX_INPUT);