Android Java: .setText() every x ms -

i want following: give string global function in app , function opens framelayout looks speech bubble. 1 includes textview string. works pretty far - want "live speech". text shouldn't appear, every single character after x miliseconds. like:
h
he
hel
hell
(etc.)

do have ideas that? thanks!

i've written class extending asynctask quick example of how can this:

public class typertask extends asynctask<void, string, void> {     textview mtextview;     string mmessage;     int mtypingdelay;      typertask(textview textview, string message, int typingdelay) {         this.mtextview = textview;         this.mmessage = message;         this.mtypingdelay = typingdelay;     }      @override     protected void doinbackground(void... params) {         (int = 0; < mmessage.length(); i++) {             publishprogress(string.valueof(mmessage.charat(i)));             try {                 thread.sleep(mtypingdelay);             } catch (interruptedexception e) {                 e.printstacktrace();             }         }         return null;     }      @override     protected void onprogressupdate(string... typedchar) {         mtextview.append(typedchar[0]);     }  } 

here's how use it:

textview mytextview = (textview) findviewbyid(r.id.mytextview); new typertask(mytextview, "this test message.", 100).execute();