java - 最后一个 Spinner 元素上的 OnClickListener()

Question

嗨，我有来自 ArrayList (工作列表) 的 Spinner(SpinnerP) 。工作列表中的最后一个元素是“add”

ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, R.layout.spinneritem, worklist);
         dataAdapter.setDropDownViewResource(R.layout.custom_spinner);
         SpinnerP.setAdapter(dataAdapter);

Spinner 工作正常，但我需要为 Spinner 中的最后一个元素创建类似 onClickListener 的东西。这将是“ADD to Spinner”操作。我怎样才能做到这一点？

当我使用 Spinner.setOnItemSelectedListener(new OnItemSelectedListener()) 时，出现 2 个错误

Multiple markers at this line
    - OnItemSelectedListener cannot be resolved to a type
    - The method setOnItemSelectedListener(AdapterView.OnItemSelectedListener) in the type AdapterView<SpinnerAdapter> is not applicable for the 
     arguments (new OnItemSelectedListener(){})

Answer 1

设置一个onItemSelectedListener，然后检查它是否是该项目。例如:

Spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {

                String selectedValue = arg0.getItemAtPosition(arg2).toString();

                if(selectedValue.equals("add")){
                          // add item to spinner
                }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }
    });    

您需要像这样导入onItemSelectedListener:

import android.widget.AdapterView.OnItemSelectedListener;