在另一个对话框的单击事件中创建对话框时出现问题

问：

我喜欢在另一个对话框的单击事件中显示一个对话框。我的代码在下面给出。但它显示一个错误 - 标记 “）”， ;预期，标记 “）” 上的语法错误， ;预期。任何人都可以清除这个问题吗

final CharSequence[] PhoneModels = {“发布日期”， “类别”， “金额”}; final AlertDialog.Builder alt_bld = new AlertDialog.Builder（this）; alt_bld.setTitle（“选择一个选项”）;

      alt_bld.setSingleChoiceItems(PhoneModels, -1, new DialogInterface.OnClickListener() {

      public void onClick(DialogInterface dialog, int item) {

      //UpdateDisplay();
          //   dialog.dismiss();

          getApplicationContext();
          if(PhoneModels[item]=="Pub Date")
               {@Override
              protected Dialog onCreateDialog(int id)
               {
                   Calendar c = Calendar.getInstance();
                   int cyear = c.get(Calendar.YEAR);
                   int cmonth = c.get(Calendar.MONTH);
                   int cday = c.get(Calendar.DAY_OF_MONTH);
                   switch (id) {
                   case DATE_DIALOG_ID:
                   return new DatePickerDialog(this,  mDateSetListener,  cyear, cmonth, cday);
                   }
                   return null;
                   }
               private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
                  // onDateSet method
                  public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                  String date_selected = String.valueOf(monthOfYear+1)+" /"+String.valueOf(dayOfMonth)+" /"+String.valueOf(year);
                  Toast.makeText(ExampleApp.this, "Selected Date is ="+date_selected, Toast.LENGTH_SHORT).show();
                  }
                  };

              Toast.makeText(getApplicationContext(), " will be here", Toast.LENGTH_SHORT).show();
                 }
          else if(PhoneModels[item]=="Catagory")
                     {Toast.makeText(getApplicationContext(), " will not be here", Toast.LENGTH_SHORT).show();
                        }
          else
                       {Toast.makeText(getApplicationContext(), "It will be here", Toast.LENGTH_SHORT).show();
                          }
      }
      });

      AlertDialog alert = alt_bld.create();
      alert.show();

    // display UI

}