我如何在使用自定义查看器的情况下实现if语句,而又不会导致该视图在滚动时在其他项目(重复项)中多次出现?
我有一个RecyclerView,带有一个自定义的观察器,可以按预期工作。但是,我在每个列表项中都有一个很小的图像图标,仅当该列表项的textView之一被填写时才应显示。当我尝试在自定义查看器中实现if语句时,当我滚动RecyclerView时,它将导致该视图重复。
顺便说一下,如果我使用
@Override
public int getItemViewType(int position) {
return position;
}
它防止重复,但也会导致动画问题,并带有“滑动消除”功能。它不再平滑,但似乎有点眨眼或出现故障。以下是我的ViewHolder:
private class CustomViewHolder extends RecyclerView.ViewHolder {
ImageView candidateMainImage;
ImageView careerIcon;
TextView candidateCareerText;
TextView candidateBioText;
CustomViewHolder(View itemView) {
super(itemView);
candidateMainImage = itemView.findViewById(R.id.imageview_swipe_profile_container);
careerIcon = itemView.findViewById(R.id.imageview_swipe_career_icon);
candidateCareerText = itemView.findViewById(R.id.textview_swipe_career_display);
candidateBioText = itemView.findViewById(R.id.textview_swipe_bio_display);
mContext = itemView.getContext();
}
void bind(SwipeCandidate candidate) {
StorageReference candidateImageReference = candidate.getCandidateImageReference();
GlideApp.with(candidateMainImage)
.load(candidateImageReference)
.into(candidateMainImage);
String textCareer = candidate.getCandidateCareer();
candidateCareerText.setText(textCareer);
candidateCareerText.setVisibility(View.VISIBLE);
String bio = candidate.getCandidateBio();
candidateBioText.setText(bio);
candidateBioText.setVisibility(View.VISIBLE);
if (!TextUtils.isEmpty(candidate.getCandidateCareer())) {
careerIcon.setVisibility(View.VISIBLE); // This gets duplicated into unwanted items
}
}
}
ViewHolder
在项目之间回收,因此如果candidate.getCandidateCareer()
为not空,则需要将状态重置为默认值:
if (!TextUtils.isEmpty(candidate.getCandidateCareer())) {
careerIcon.setVisibility(View.VISIBLE); // This gets duplicated into unwanted items
} else {
careerIcon.setVisibility(View.GONE); // or whatever your default is
}
只需在此处离开Rajnish答案,以便其他人来。
解决方案也只是添加一个“ else”语句,所以我的最终代码如下:
if (!TextUtils.isEmpty(candidate.getCandidateCareer())) {
careerIcon.setVisibility(View.VISIBLE);
} else {
careerIcon.setVisibility(View.GONE);
}