从 OnItemSelectedListener 调用值

Question

我使用 spinner.setOnItemSelectedListener() 将微调器中所选项目的值传递给字符串变量 'selectedSpinner'。我正在尝试在方法之外访问 'selectedSpinner'。

我试图将 'selectedSpinner' 分配给另一个字符串 'selectedCategory' 但在 spinner.setOnItemSelectedListener()方法，'selectedSpinner'无法解析。在方法之外访问 'selectedSpinner' 应该怎么做？谢谢

private void recordDialog() {

    ...
    //get category
    final Spinner spinner = subView.findViewById(R.id.spinner);
    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.category, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            String selectedSpinner = parent.getItemAtPosition(position).toString();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });
    final String selectedCategory = selectedSpinner;
    ...
    final AlertDialog alertDialog = builder.create();
    alertDialog.show();
}

Answer 1

您需要在 recordDialog 函数外声明 selectedSpinner（或将其设置为全局）

String selectedSpinner;
          ...
private void recordDialog() {
          ...... 
     @Override
      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
         selectedSpinner = parent.getItemAtPosition(position).toString();
      }
}

之后您可以将 selectedSpinner 分配给 selectedCategory。

从 OnItemSelectedListener 调用值

Calling value from OnItemSelectedListener

android

android-spinner

onitemselectedlistener