Spinner2的基础上选择的微调1的动态更新 [英] Dynamic update of Spinner2 based on choice in Spinner 1

问题描述

在使用此code（摘自<一个href="http://stackoverflow.com/questions/3984958/how-to-get-multiple-spinner-in-android-where-value-of-one-spinner-depends-on-valu/4491960#4491960">here)我得到以下错误：

  

构造ArrayAdapter（新   AdapterView.OnItemSelectedListener（）{}，   INT，字符串[]）未定义

任何人都可以帮助纠正呢？谢谢

 私人无效setDynamicSpinnerBE（）{
    beSpinner =（微调）findViewById（R.id.spBE）;
    最终的String [] itemsSpinner2;
    lensSpinner.setOnItemSelectedListener（新OnItemSelectedListener（）{

        公共无效onItemSelected（适配器视图＆LT;＆GT;母公司视图中查看，
                INT位置，长的id）{
            整型长焦点=（整数）parent.getAdapter（）的getItem（
                    位置）;
            itemsSpinner2 = getBellowsExtension（长焦点，maxBellows，
                    precision）;

            ArrayAdapter＆LT; CharSequence的＆GT; beAdapter =新的ArrayAdapter＆LT; CharSequence的＆GT;（
                    对此，android.R.layout.simple_spinner_item，
                    itemsSpinner2）;
            beAdapter
                    .setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）;
            beSpinner.setAdapter（beAdapter）;

        }

        公共无效onNothingSelected（适配器视图＆LT;＆GT;母公司）{
            beSpinner.setAdapter（空）;
        }
    }

    ）;
    ...
}
 

解决方案

在构造新的 ArrayAdapter 以下行：

  ArrayAdapter＆LT; CharSequence的＆GT; beAdapter =新的ArrayAdapter＆LT; CharSequence的＆GT;（这一点，
 

这指向 OnItemSelectedListener 类，你是在和不父视图当前的情况下，这是问题出现时，因为 ArrayAdapter 没有匹配的构造。你应该尝试使用 MyParentView.this （其中 MyParentView 是视图的名字你是），而不是传递相应的实例。

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

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

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);
        }
    }

    );
    ...
}

解决方案

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

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

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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