前面的一些答案是非常正确的，我只是想确保你们没有人陷入这样的问题。

如果使用String将值设置为ArrayList。格式，你必须得到值的位置使用相同的字符串结构string .format。

一个例子:

ArrayList<String> myList = new ArrayList<>();
myList.add(String.format(Locale.getDefault() ,"%d", 30));
myList.add(String.format(Locale.getDefault(), "%d", 50));
myList.add(String.format(Locale.getDefault(), "%d", 70));
myList.add(String.format(Locale.getDefault(), "%d", 100));

你必须像这样得到所需值的位置:

myList.setSelection(myAdapter.getPosition(String.format(Locale.getDefault(), "%d", 70)));

否则，您将得到-1，项未找到!

我使用Locale.getDefault()，因为是阿拉伯语。

我希望这对你有帮助。

I had the same issue when trying to select the correct item in a spinner populated using a cursorLoader. I retrieved the id of the item I wanted to select first from table 1 and then used a CursorLoader to populate the spinner. In the onLoadFinished I cycled through the cursor populating the spinner's adapter until I found the item that matched the id I already had. Then assigned the row number of the cursor to the spinner's selected position. It would be nice to have a similar function to pass in the id of the value you wish to select in the spinner when populating details on a form containing saved spinner results.

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {  
  adapter.swapCursor(cursor);

  cursor.moveToFirst();

 int row_count = 0;

 int spinner_row = 0;

  while (spinner_row < 0 || row_count < cursor.getCount()){ // loop until end of cursor or the 
                                                             // ID is found 

    int cursorItemID = bCursor.getInt(cursor.getColumnIndexOrThrow(someTable.COLUMN_ID));

    if (knownID==cursorItemID){
    spinner_row  = row_count;  //set the spinner row value to the same value as the cursor row 

    }
cursor.moveToNext();

row_count++;

  }

}

spinner.setSelection(spinner_row ); //set the selected item in the spinner

}

假设您需要从资源的字符串数组填充微调器，并且希望保持从服务器选择的值。 这是在旋转器中从服务器中设置选定值的一种方法。

pincodeSpinner.setSelection(resources.getStringArray(R.array.pincodes).indexOf(javaObject.pincode))

希望能有所帮助! 另外，代码是在Kotlin!

这是我通过字符串获取索引的简单方法。

private int getIndexByString(Spinner spinner, String string) {
    int index = 0;

    for (int i = 0; i < spinner.getCount(); i++) {
        if (spinner.getItemAtPosition(i).toString().equalsIgnoreCase(string)) {
            index = i;
            break;
        }
    }
    return index;
}

非常简单，只需使用getSelectedItem();

eg :

ArrayAdapter<CharSequence> type=ArrayAdapter.createFromResource(this,R.array.admin_typee,android.R.layout.simple_spinner_dropdown_item);
        type.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mainType.setAdapter(type);

String group=mainType.getSelectedItem().toString();

上述方法返回一个字符串值

在上面的R.array。Admin_type是值中的字符串资源文件

只需在值>>字符串中创建一个.xml文件

这是我的解决方案

List<Country> list = CountryBO.GetCountries(0);
CountriesAdapter dataAdapter = new CountriesAdapter(this,list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spnCountries.setAdapter(dataAdapter);
spnCountries.setSelection(dataAdapter.getItemIndexById(userProfile.GetCountryId()));

和下面的getItemIndexById

public int getItemIndexById(String id) {
    for (Country item : this.items) {
        if(item.GetId().toString().equals(id.toString())){
            return this.items.indexOf(item);
        }
    }
    return 0;
}

希望这对你有所帮助!