重新选择项目时的 Android Spinner

如何解决重新选择项目时的 Android Spinner

我的布局中有一个 spinner。目前，一切正常，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项被重新选择了？。

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
}

解决方法

我不知道这个想法是否可以帮助您，但是您可以尝试使用您在“onItemSelected”中获得的 pos 或 id 值创建一个 ArrayList，并在您读取 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);
}

,

我通过此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,getSelectedItemId());
        }
    }

}