android - AutoCompleteTextView、DropDown、setOnDismissListener、<17 api

Question

求助

setOnDismissListener 仅适用于 API >=17

如何在低于 17 的 API 中检测 AutoCompleteTextView DropDowns 的出现和消失？

Answer 1

我已经在 API 级别 16 上进行了测试(运行良好)。但请问 Android 大师:我认为这不是很合适的方法，我期待您的明智建议:

把这段代码放到public class CustomAutoCompleteTextView extends AutoCompleteTextView

public void setupActv() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        setOnDismissListener(new OnDismissListener() {
            @Override
            public void onDismiss() {
                Log.d("testThisShit", "on Dismiss");
            }
        });
    } else {
        try {
            Field popup = AutoCompleteTextView.class.getDeclaredField("mPopup");
            popup.setAccessible(true);
            ListPopupWindow popupWindow = (ListPopupWindow) popup.get(this);

            popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
                @Override
                public void onDismiss() {
                    Log.d("testThisShit", "on Dismiss < 17");
                }
            });

        } catch (NoClassDefFoundError | ClassCastException | NoSuchFieldException | IllegalAccessException e) {
            Log.d("testThisShit", e.getMessage());
        }
    }
}