android - Loading content from database for listview on click of the button? -

i created application based on quiz.for used listview populate questions database populates question @ time.can u me how 1 question on button click?mainactivity contains code in oncreate

   l1=(listview)findviewbyid(r.id.listview);    myadap adap1=new myadap(this,c1);    c1=db.rawquery("select * donut",null);    l1.setadapter(adap1); 

myadapter class contains 4 textviews.

try using api displaying list database http://developer.android.com/reference/android/support/v4/widget/cursoradapter.html