java - How to show alertdialog before asynctask start -

i want show alertdialog , input user , after that, processing inputs in asynctask alertdialog become dismissed before inputs , asynctask start execute.

what should do? please me. here code;

private string[] newspapers,newspapersurl,newspaperspath; private string[] choosed,choosedurl,choosedpath; private boolean[] checked;  private int pernewspaper; private boolean returned = false;  private alertdialog.builder  builder;   private fetchingnewsbychoice fetchingnewsbychoice;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);     setsupportactionbar(toolbar);      returned = alertdialogcreation();      if(returned)     {         fetchingnewsbychoice = new fetchingnewsbychoice((appcompatactivity)mainactivity.this,choosed,choosedpath,pernewspaper);         fetchingnewsbychoice.execute();     }       floatingactionbutton fab = (floatingactionbutton) findviewbyid(r.id.fab);     fab.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             snackbar.make(view, "replace own action", snackbar.length_long)                     .setaction("action", null).show();         }     }); }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.menu_main, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     // handle action bar item clicks here. action bar     // automatically handle clicks on home/up button, long     // specify parent activity in androidmanifest.xml.     int id = item.getitemid();      //noinspection simplifiableifstatement     if (id == r.id.action_settings) {         return true;     }      return super.onoptionsitemselected(item); }  //***** alert dialog *****// public boolean alertdialogcreation() {     //***** file control , creating dialog interface if first usage *****//     file file = getapplicationcontext().getfilestreampath("first.txt");      if(!file.exists())     {         writetofile("first.txt", "0",true);     }      if(readfromfile("first.txt",false)[0].equals("0"))     {         newspapers = readfromfile("choicable newspaper.txt",true);         newspapersurl = readfromfile("choicable url.txt",true);         newspaperspath = readfromfile("choicable path.txt",true);          checked = new boolean[newspapers.length];          builder = new alertdialog.builder(this,r.style.appcompatalertdialogstyle);          builder.settitle("lütfen güncel haberlerini takip etmek İstediğiniz siteleri seçiniz..");         builder.setitems(newspapers, null);          builder.setpositivebutton("tamam", new dialoginterface.onclicklistener() {             @override             public void onclick(dialoginterface dialoginterface, int i) {                 int count = 0;                  (int = 0; < newspapers.length; a++) {                     if (checked[a]) {                         count++;                         writetofile("choosed.txt", newspapers[a], false);                         writetofile("choosedurl.txt", newspapersurl[a], false);                         writetofile("choosedpath.txt", newspaperspath[a], false);                     }                      if (a == (newspapers.length - 1) && count == 0) {                         toast.maketext(getapplicationcontext(), "en az bir gazete seçmek zorundasınız..", toast.length_long).show();                         builder.show();                     }                 }             }         });          builder.setmultichoiceitems(newspapers, checked, new dialoginterface.onmultichoiceclicklistener() {             @override             public void onclick(dialoginterface dialoginterface, int i, boolean ischecked) {                  if (ischecked) {                     checked[i] = true;                 } else {                     checked[i] = false;                 }             }         });          try         {             builder.show();         }         catch (exception ex)         {             ex.printstacktrace();         }           writetofile("first.txt", "1", true);          choosed = readfromfile("choosed.txt",false);         choosedurl = readfromfile("choosedurl.txt",false);         choosedpath = readfromfile("choosedpath.txt",false);          if(choosed != null)         {             pernewspaper = (int) math.ceil(newspapers.length / choosed.length);              if(pernewspaper > 15)             {                 pernewspaper = 14;             }         }          return true;     }     else if(readfromfile("first.txt",false)[0].equals("1"))     {         newspapers = readfromfile("choicable newspaper.txt",true);         newspapersurl = readfromfile("choicable url.txt",true);         newspaperspath = readfromfile("choicable path.txt",true);          choosed = readfromfile("choosed.txt",false);         choosedurl = readfromfile("choosedurl.txt",false);         choosedpath = readfromfile("choosedpath.txt",false);          pernewspaper = (int) math.ceil(newspapers.length / choosed.length);          if(pernewspaper > 15)         {             pernewspaper = 14;         }          return true;     }     else     {         return false;     }     //***** file control , creating dialog interface if first usage *****// }  //*****files*****// private void writetofile(string filename,string data,boolean isprivate) {     try     {         outputstreamwriter outputstreamwriter;          if(isprivate)         {             outputstreamwriter = new outputstreamwriter(getapplicationcontext().openfileoutput(filename, mode_private));         }         else         {              outputstreamwriter = new outputstreamwriter(getapplicationcontext().openfileoutput(filename, mode_append));         }          outputstreamwriter.write(data+"\r\n");          outputstreamwriter.close();     }     catch (ioexception e)     {      } }   public string[] readfromfile(string filename,boolean isasset) {     string[] ret=null;      try     {         inputstream inputstream;          if(isasset)         {              inputstream = getapplicationcontext().getassets().open(filename);         }         else         {              inputstream = getapplicationcontext().openfileinput(filename);         }           if (inputstream != null)         {              inputstreamreader inputstreamreader = new inputstreamreader(inputstream);             bufferedreader bufferedreader = new bufferedreader(inputstreamreader);               string receivestring;              stringbuilder stringbuilder = new stringbuilder();              while ( (receivestring = bufferedreader.readline()) != null ) {                  stringbuilder.append(receivestring).append(",");             }              inputstream.close();             ret = stringbuilder.tostring().split(",");              inputstream.close();         }     }     catch (filenotfoundexception e)     {      }     catch (ioexception e)     {      }      return ret; } 

i suppose have setpositivebutton click listener. start asynktask in listener desired input.