要按值设置Spinner的选定项，请返回-1

Question

我使用以下代码按值设置微调器的选定项。但我得到的位置是-1。

代码：

final ArrayAdapter<CharSequence> adapter1 = new ArrayAdapter<CharSequence>(this,android.R.layout.simple_list_item_1, location_days2);
        adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        location_days.setAdapter(adapter1);
        String b = "5 Days"; 
        int a = adapter.getPosition(b); //this should return 5, but returns -1
        location_days.setSelection(a);

字符串数组：

private String [] location_days2 = {“选择日期”，“1天”，“2天”，“3天”，“0天”，“5天”，“6天”};

Answer 1

public ActionResult ActionName(model modelName)

在上面的行中用 adapter1 替换适配器，因为您已将适配器初始化为＆＃34; adapter1＆＃34;

Answer 2

您可以执行以下操作来在微调器中设置选择

int pos = 0;
String[] location_days2 = {"Select days", "1 Day", "2 Days", "3 Days", "0 Days", "5 Days", "6 Days"};
for (String location : location_days2) {
   if (location.equalsIgnoreCase("5 Days")) {
       pos = Arrays.asList(location_days2).indexOf("23");
       break;
      }
    }
location_days.setSelection(pos);