Android 要按值设置微调器的选定项，请返回-1

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);

final ArrayAdapter adapter 1=新的ArrayAdapter（这是android.R.layout.simple\u list\u item\u 1，location\u days2）；
adapter1.setDropDownViewResource（android.R.layout.simple\u微调器\u下拉菜单\u项）；
位置\设置适配器（适配器1）；
字符串b=“5天”；
INTA=适配器.getPosition（b）//这应该返回5，但返回-1
地点(天)选举(a);；

字符串数组：

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);

私有字符串[]location_days2={“选择天数”、“1天”、“2天”、“3天”、“0天”、“5天”、“6天”}

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将适配器替换为上行中的适配器1，因为您已将适配器初始化为“适配器1”

可以执行类似操作以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);

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是的，现在开始工作了。这是一个愚蠢的问题@sathiya