java - TextView will not update from a loop in Android -

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I have a simple app that updates a TextView with values ​​generated in a loop When I click on a button

But when I run the app, it only shows the last number in the TextView . I added Thread.sleep () to slow the loop but it does not work, yet what is wrong with me here? Thanks in advance 

  public class mainstred actionbusiness activity (button btnshow; textview txtSee; @ override protected minus creatives (bundle saved instenstate) {super. Knight (saved instenstate); setContentView (R.layout.activity_main_thread); BtnShow = (button) findViewById (R.id.btnShow); TxtSee = (TextView) Find ViewById (R.id.txtSee); BtnShow.setOnClickListener (new OnClickListener) {@Override Public void onClick (see v) {try (for int i = 0; i & lt; = 5; i ++) {string lesson 1 = "no change" + i + "" "; TxtSee . SetText (text1); thread (2000);}} Catch (Interrupted Expression E) {}}});} ....}

> 

  txtSee.setText (text1);

Your loop is performing very fast so that you can see the changes


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