java - How much of this code should be inside the UI Thread? -

so have asynctask doing work in background. work list of commands done in loop. commands may run following method (inside loop):

public void print() {     // create , add textview     // variable "c" activity reference, in constructor passing "this" activity     textview tv = new textview(c);     // set text     tv.settext(text);     // set style     tv.settextcolor(color.white);     tv.settextsize(fontsize);     tv.setsingleline(false);     // add linear layout     display.addview(tv);     // add spacer     view spacer = new view(c);     // set bg color     spacer.setbackgroundcolor(color.argb(0x88, 0, 0, 0));     // set width , height     spacer.setlayoutparams(new linearlayout.layoutparams(linearlayout.layoutparams.match_parent, separatorheight));     // add layout     display.addview(spacer);     // screen should update     displaychanged = true; } 

at end of loop have line:

if (displaychanged) updatescreen(); 

and updatescreen() method:

private void updatescreen() {     // surround linear layout vertical scroll view     scrollview scrollview = new scrollview(c);     scrollview.setverticalscrollbarenabled(false);     scrollview.setlayoutparams(new relativelayout.layoutparams(relativelayout.layoutparams.match_parent, relativelayout.layoutparams.match_parent));     scrollview.addview(display);     // set code background color     scrollview.setbackgroundcolor(color.rgb(0xaa, 0xaa, 0xaa));     // finally, display     c.setcontentview(scrollview);     // screen shouldn't update again     displaychanged = false; } 

as can see, both methods (print , updatescreen) work views , updatescreen setcontentview. want run of code in asynctask background thread. how of code should in runonuithread(... code here ...)?

you can set displaychanged in background thread. rest of code uses ui toolkit , accessing in uithread considered unsafe , not recommended google according the documentation.