Android 微调器重新选择项目

Question

我的布局中有一个 微调器。 目前，一切都运行良好，但我需要在重新选择项目时做一些事情。

有没有办法知道微调器项目被重新选择？

public void onItemSelected(AdapterView<?> parent, View view,
        int pos, long id) {
    // An item was selected. You can retrieve the selected item using
}

public void onNothingSelected(AdapterView<?> parent) {
    // Another interface callback
}

Answer 1

我不知道这个想法是否可以帮助您，但您可以尝试创建一个 ArrayList，其中包含您在“onItemSelected”中获得的 pos 或 id 值，并在您阅读 ArrayList 搜索它的方法内部......像这样：

ArrayList<Integer> positions = new ArrayList();
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
   for(int posit : positions){
      if(posit==pos){
         //item reselected
      }
   }
   positions.add(pos);
}

Answer 2

我通过这个自定义微调器代码在onItemSelected中实现了重新选择回调。 参考： https://stackoverflow.com/a/11323043/9909365

import android.content.Context;
import android.util.AttributeSet;
import android.widget.Spinner;


/** Spinner extension that calls onItemSelected even when the selection is the same as its previous value */
public class NDSpinner extends Spinner {

    public NDSpinner(Context context)
    { super(context); }

    public NDSpinner(Context context, AttributeSet attrs)
    { super(context, attrs); }

    public NDSpinner(Context context, AttributeSet attrs, int defStyle)
    { super(context, attrs, defStyle); }

    @Override 
    public void setSelection(int position, boolean animate) {
        boolean sameSelected = position == getSelectedItemPosition();
        super.setSelection(position, animate);
        if (sameSelected) {
            // Spinner does not call the OnItemSelectedListener if the same item is selected, so do it manually now
            getOnItemSelectedListener().onItemSelected(this, getSelectedView(), position, getSelectedItemId());
        }
    } 

    @Override
    public void setSelection(int position) {
        boolean sameSelected = position == getSelectedItemPosition();
        super.setSelection(position);
        if (sameSelected) {
            // Spinner does not call the OnItemSelectedListener if the same item is selected, so do it manually now
            getOnItemSelectedListener().onItemSelected(this, getSelectedView(), position, getSelectedItemId());
        }
    }

}