根据Spinner 1中的选择动态更新Spinner2 [英] Dynamic update of Spinner2 based on choice in Spinner 1

问题描述

在使用此代码（改编自这里）我得到以下错误：

In using this code (adapted from here) I get the following error:

构造函数ArrayAdapter新
AdapterView.OnItemSelectedListener（）{}，
int，String []）未定义

The constructor ArrayAdapter(new AdapterView.OnItemSelectedListener(){}, int, String[]) is undefined

任何人帮助纠正这个感谢

Can anyone help correct this? Thanks

private void setDynamicSpinnerBE() {
    beSpinner = (Spinner) findViewById(R.id.spBE);
    final String[] itemsSpinner2;
    lensSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        public void onItemSelected(AdapterView<?> parent, View view,
                int position, long id) {
            Integer focalLength = (Integer) parent.getAdapter().getItem(
                    position);
            itemsSpinner2 = getBellowsExtension(focalLength, maxBellows,
                    precision);

            ArrayAdapter<CharSequence> beAdapter = new ArrayAdapter<CharSequence>(
                    this, android.R.layout.simple_spinner_item,
                    itemsSpinner2);
            beAdapter
                    .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            beSpinner.setAdapter(beAdapter);

        }

        public void onNothingSelected(AdapterView<?> parent) {
            beSpinner.setAdapter(null);
        }
    }

    );
    ...
}

推荐答案

在下面这行的新的 ArrayAdapter 的构造函数中：

In the constructor to your new ArrayAdapter on the following line:

ArrayAdapter<CharSequence> beAdapter = new ArrayAdapter<CharSequence>(this,

此指向您所在的 OnItemSelectedListener 类的当前实例，而不是父视图，这是由于 ArrayAdapter 没有匹配的构造函数，你应该尝试使用 MyParentView.this （其中 MyParentView 是

this points to the current instance of the OnItemSelectedListener class you are in and not the parent view, this is where the problem occurs because ArrayAdapter does not have a matching constructor. You should try using MyParentView.this (where MyParentView is the name of the view you are in) instead to pass the appropriate instance.

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