【发布时间】：2020-07-07 21:07:46
【问题描述】：
我的 recyclerview 的每一行都有一个“收藏夹”按钮，用户在喜欢图像时单击该按钮（显然）。每一行都是一个卡片视图，我只想在用户打开片段时“翻转”。
当用户单击按钮时，我用“Y”或“N”更新我的数据库。 我的问题是即使列表没有更改，我的 recyclerview 也会刷新。当它刷新我所有的卡片时，我不想要的翻转。单击按钮时如何阻止recyclerview更新？
这是我的适配器类
@Override
public void onBindViewHolder(@NotNull final ClothesViewHolder holder, final int position) {
String image;
if (flip) {
holder.flipView.flipTheView();
}
ClothingItem current = mClothingItems.get(position);
holder.itemNameView.setText(current.getItem());
holder.categoryNameView.setText(current.getCategory());
holder.seasonNameView.setText(current.getSeason());
Integer yesCount = current.getYesCount();
Integer noCount = current.getNoCount();
if (current.getFavourite().equalsIgnoreCase("N")) {
holder.animationView.setProgress(0);
}
else {
holder.animationView.setProgress(1);
}
holder.yesTextView.setText(String.valueOf(yesCount));
holder.noTextView.setText(String.valueOf(noCount));
image = current.getPhotoPath();
Glide.with(holder.cardView)
.load(image)
.into(holder.pictureView);
flip = false;
} catch (NullPointerException e) {
Log.e("Picture","onBindViweHolder: Null Point:" + e.getMessage());
}
holder.animationView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listener.onFavouriteClick(position);
}
});
public interface clickButtons {
void onFavouriteClick(int position);
}
片段类
@Override
public void onFavouriteClick(int position) {
RecyclerView.ViewHolder holder = recyclerView.findViewHolderForAdapterPosition(position);
LottieAnimationView animationView = holder.itemView.findViewById(R.id.favouriteAnimation);
ClothingItem item = springList.get(position);
final Long id = item.getId();
if (animationView.getProgress() > 0) {
animationView.setProgress(0);
mClothingViewModel.updateFavourite(id.intValue(), "N");
adapter.notifyItemChanged(position,"favourite");
} else if (animationView.getProgress() == 0) {
animationView.playAnimation();
mClothingViewModel.updateFavourite(id.intValue(),"Y");
}
}
我尝试将 onBindViewHolder 与有效负载一起使用，但得到了相同的结果。我认为我没有正确调用它
adapter.notifyItemChanged(position,"favourite");
适配器类
@Override
public void onBindViewHolder(final ClothesViewHolder holder ,final int position, final List<Object> payloads){
String image;
if(!payloads.isEmpty()) {
ClothingItem current = mClothingItems.get(position);
holder.itemNameView.setText(current.getItem());
holder.categoryNameView.setText(current.getCategory());
holder.seasonNameView.setText(current.getSeason());
Integer yesCount = current.getYesCount();
Integer noCount = current.getNoCount();
if(yesCount == null) {
yesCount = 0;
}
if (noCount == null) {
noCount = 0;
}
if (current.getFavourite() == null || current.getFavourite().equalsIgnoreCase("N")) {
holder.animationView.setProgress(0);
}
else {
holder.animationView.setProgress(1);
}
// Log.d("Counting","Yes count " + yesCount + " no count " + noCount);
holder.yesTextView.setText(String.valueOf(yesCount));
holder.noTextView.setText(String.valueOf(noCount));
image = current.getPhotoPath();
Glide.with(holder.cardView)
.load(image)
.into(holder.pictureView);
} else {
onBindViewHolder(holder,position);
}
}
片段
@Override
public void onFavouriteClick(int position) {
RecyclerView.ViewHolder holder = recyclerView.findViewHolderForAdapterPosition(position);
LottieAnimationView animationView = holder.itemView.findViewById(R.id.favouriteAnimation);
ClothingItem item = springList.get(position);
final Long id = item.getId();
if (animationView.getProgress() > 0) {
animationView.setProgress(0);
mClothingViewModel.updateFavourite(id.intValue(), "N");
adapter.notifyItemChanged(position,"favourite");
} else if (animationView.getProgress() == 0) {
animationView.playAnimation();
mClothingViewModel.updateFavourite(id.intValue(),"Y");
adapter.notifyItemChanged(position,"favourite");
}
}
【问题讨论】：
标签： java android android-recyclerview android-room