java - Android ScrollView only scroll to bottom if you're already there -


i have basic android app set scroll view , text added dynamically. want scroll bottom when text added (which happens) want scroll bottom if @ bottom, if you're reading doesn't scroll. here's have far.

private void addtext(final string msg){     this.runonuithread(new runnable() {         public void run() {             textview log = (textview) findviewbyid(r.id.chatlog);             if(log.gettext().equals("loading...")){                 log.settext(msg);             }else{                 scrollview scroller = (scrollview) findviewbyid(r.id.scroll_container);                 //set current scroll position                 int scroll_pos = scroller.getscrolly();                 //scroll bottom                 scroller.fullscroll(scrollview.focus_down);                 //set bottom position                 int scroll_bot = scroller.getscrolly();                 //add text                 log.append("\r\n" + msg);                 //if weren't @ bottom                 //scroll were.                 //this isn't working, scroll bot same                 //as scroll pos.                 if(scroll_pos != scroll_bot){                     scroller.scrollto(0, scroll_pos);                 }                 //system.out.println("pos: " + scroll_pos);                 //system.out.println("bot: " + scroll_bot);             }         }     }); }

the best solution found far use scrollview.post() method runnable invoked after text change:

final scrollview scrollview = (scrollview) findviewbyid(r.id.consoletab); textview textview = (textview) findviewbyid(r.id.consoleview); boolean autoscroll = (textview.getbottom() - (scrollview.getheight() + scrollview.getscrolly())) <= 0; textview.settext(state.getconsole().gettext());  if (autoscroll) {    scrollview.post(new runnable() {       public void run() {          scrollview.fullscroll(scrollview.focus_down);       }    }); }

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