Question

在这种情况下，我试图返回其他变量的值：

If {{Click text}} of a clicked element is available return clicktext If {{Clicktext}} is undefined return {{Click ID}} If {{Clicktext}} and {{Click ID}} are undefined return {{Click Class}}

我已经尝试过了，但是它总是给我错误

    function () { 
if {{Click Text}} == undefined  { 
return {{Click ID}}; 
} 

if else ({{Click Text}} === undefined || {{Click ID}} == undefined ) {
return {{Click Classes}};
}
}

Answer 1

尝试以下操作：

public class CardsViewPager extends PagerAdapter {

Context context;
List<Card> cardList;
LayoutInflater layoutInflater;


public CardsViewPager(Context context, List<Card> cards) {
    this.context = context;
    this.cardList = cards;
    layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
    return cardList.size();
}

@Override
public boolean isViewFromObject(View view, Object object) {
    return view == ((ScrollView) object);
}

@Override
public Object instantiateItem(ViewGroup container, final int position) {
    View itemView = layoutInflater.inflate(R.layout.item_card, container, false);

    TextView mTitle = itemView.findViewById(R.id.item_card_title);
    mTitle.setText(cardList.get(position).getTitle());

    TextView mDescription = itemView.findViewById(R.id.item_card_description);
    mDescription.setText(cardList.get(position).getDescription());

    ImageView imageView = itemView.findViewById(R.id.item_card_image);
    Glide.with(context).load(cardList.get(position).getImage()).into(imageView);

    container.addView(itemView);

    imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(context, "you clicked image " + (position + 1), Toast.LENGTH_LONG).show();
        }
    });

    return itemView;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    container.removeView((LinearLayout) object);
}

您要测试的语句应封装在括号中。您发布的if语句不是这种情况。其次，如果else不是有效的条件语句。

如果一个或多个相等的undefined / empty / null，则返回另一个变量的值

1 个答案: