如何在选择相同的Spinner值时调用操作

Question

如何在选择相同的Spinner值时调用操作

androidandroid-spinner

6

我选择了下拉列表中的一个选项，当我再次选择相同的选项时，单击操作不会执行。

- kirti kiran

2

跟踪先前选择的值，并检查当前选择的值是否为先前选择的值。 - Pragnani

检查当前选择的值和之前的值是否相同。 - RajaReddy PolamReddy

1个回答

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- user1924779 · Accepted Answer

使用这个自定义的Spinner类...

/** 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());
    }
  }
}