键盘没有显示内部警报对话框与EditText的ListView

//code of AlertDialog
        final AlertDialog.Builder alert = new AlertDialog.Builder(getActivity());
        alert.setTitle(R.string.modification);
        persoFomulair=new ListView(getActivity());
        List>>list = prepareList(p);
        MyListAdapter2 myListAdapter2 = new MyListAdapter2(getActivity(), R.layout.perso_list, list);
        persoFomulair.setAdapter(myListAdapter2);
        alert.setView(persoFomulair);

        alert.setPositiveButton(R.string.valider, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                //What ever you want to do with the value


                getValueOfItem();
                ModifierPerso modifierPerso = new ModifierPerso();
                modifierPerso.execute(type, String.valueOf(p.getId()), date_embauch, salair_journ);
            }

        });
        alert.setNegativeButton(R.string.annuler, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                // what ever you want to do with No option.

            }
        });
        AlertDialog alertDialog=alert.create();
        alertDialog.getWindow().clearFlags( WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);

        alertDialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
        alertDialog.show();
        
        //what i think you need to see is the only parts from the array adapter bellow this comment
                    if(type.equals("Date embauch :")){editText.setText(result);editText.setInputType(InputType.TYPE_DATETIME_VARIATION_DATE);}
            else if(type.equals("Salair Journal :")){editText.setText(result);editText.setInputType(InputType.TYPE_CLASS_NUMBER);}
            else {editText.setVisibility(View.GONE);textView.setText(type+result);}
            

//persoFomulair is a listView with editTexts
persoFomulair.post(new Runnable() {

            @Override
            public void run() {
                dialog.getWindow().clearFlags(
                        WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
                                WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
            }
        });