无法在Android中为微调器设置OnItemClickListener [英] Cannot set OnItemClickListener for spinner in android

问题描述

在自定义的RecyclerView.Adapter<CustomAdapter.ViewHolder>中，我为微调器设置了适配器，并发现选择后我的微调器的值没有改变，因此我尝试在微调器上添加OnItemClickListener:

In a customized RecyclerView.Adapter<CustomAdapter.ViewHolder>, I set an adapter for a spinner and found that the value of my spinner isn't change after selection, so I tried to add an OnItemClickListener on my spinner:

override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) {

    // The selectable items of the spinner is dynamically generated from getItems() function
    val selectableItems: List<String> = getItems()

    val spinnerAdapter = ArrayAdapter<String>(this.context, androi.R.layout.simple_spinner_item)
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
    spinnerAdapter.addAll(selectableItems)

    viewHolder.mySpinner.adapter = spinnerAdapter

    // the error occurs on the following line:
    viewHolder.mySpinner.onItemClickListener = AdapterView.OnItemClickListener { adapterView, view, i, l ->
        adapterView.setSelection(i)
    }

    viewHolder.mySpinner.setSelection(origionSelectedPosition)
}

我在编译时没有收到任何警告或错误，但是在运行时，我得到了一个RuntimeException，说setOnItemClickListener cannot be used with a spinner.这有点奇怪.我的代码有做错什么吗?还是有人知道为什么我的微调器没有随着相应的选择而改变?

I didn't get any warning or error while compiling, however during run time, I got a RuntimeException said that setOnItemClickListener cannot be used with a spinner. It is kind of strange. Did I do anything wrong in my code? Or does anyone know why my spinner didn't change with the corresponding selection?

有关Kotlin解决方案的进一步说明:

Further description for Kotlin solution:

我曾经尝试使用onItemSelectedListener，但是未能找到在kotlin中使用它的合适方法. 但是最后！以下代码解决了我的问题:

I had ever tried to use onItemSelectedListener but failed to find a suitable way to use it in kotlin. But finally! The following code solved my problem:

    viewHolder.mySpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {

        override fun onItemSelected(parent: AdapterView<*>, view: View, pos: Int, id: Long) {

        }

        override fun onNothingSelected(parent: AdapterView<out Adapter>?) {

        }

    }

推荐答案

使用setOnItemSelectedListener代替onItemClickListener.

viewHolder.mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

    }

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

    }
});

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