查看寻呼机位置工作不正常

Question

尝试实现视图寻呼机，默认情况下它应该只占第 0 位，但这里它占据第 0 位和第 1 位。我第一次期待只有第 0 名

public class ViewCardAdapter extends PagerAdapter {
public static String cardNo;
private Context context;
private List<CardDetails> cardDetailsList;
private ViewCardBinding viewCardBinding;
public ViewCardAdapter (Context context, List<CardDetails> cardDetailsList, ViewCardBinding viewCardBinding) {
this.context = context;
this.cardDetailsList = cardDetailsList;
this.viewCardBinding = viewCardBinding;
}
@Override
public int getCount () {
return cardDetailsList.size ();
}
@Override
public boolean isViewFromObject (@NonNull View view, @NonNull Object o) {
return view == o;
}
@NonNull
@Override
public Object instantiateItem (@NonNull ViewGroup container, int position) {
LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService (Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate (R.layout.mycard_adapter_layout, null);

container.addView (view);
bind (cardDetailsList.get (position), view, position);
return view;
}
@Override
public void destroyItem (ViewGroup container, int position, @NonNull Object object) {
container.removeView ((LinearLayout) object);
}
private void bind (CardDetails item, View view, int position) {
TextView tv_cardNo = view.findViewById (R.id.tv_card_no);
TextView tv_expiryDate = view.findViewById (R.id.tv_expire_date);
EditText edt_card_status = view.findViewById (R.id.et_card_status);
EditText edt_card_no = view.findViewById (R.id.et_card_no);
try {
item = cardDetailsList.get (position);
String cardStatus = item.getCardStatus ();
if (cardStatus.equals (ConstantFields.SUSPENDED) ||cardStatus.equals (ConstantFields.INACTIVE) ) {
viewCardBinding.btnSuspended.setText (context.getResources ().getString (R.string.btn_activie));
} else if (cardStatus.equals (ConstantFields.ACTIVE)) {
viewCardBinding.btnSuspended.setText (context.getResources ().getString (R.string.suspend));
}
cardNo = String.valueOf (item.getCardNumber ());
cardStatus = item.getCardStatus ();
tv_cardNo.setText (cardNo);
tv_expiryDate.setText (item.getCardExpiryDate ());
edt_card_status.setText (cardStatus);
edt_card_no.setText (cardNo);
} catch (Exception e) {
Log.e (TAG, "bind: ", e );
}
}

尝试实现视图寻呼机，默认情况下它应该只占第 0 位，但这里它占据第 0 位和第 1 位。我第一次期待只有第 0 名

Answer 1

当您想要像这样设置时，请手动设置位置：

viewPager.setCurrentItem(0); 

Answer 2

查看页器将第 0 个位置并缓存下一个位置。 使用此方法更改其默认行为。

mViewPager.setOffscreenPageLimit(int);

您可以查看此答案以获取更多详细信息。

Answer 3

使用延迟后置在视图寻呼机中设置当前项目

viewPager.postDelayed(() -> viewPager.setCurrentItem(position, true), 100);