在我的应用程序中，我应该使用recyclerView并删除一些项目
我想删除recyclerview中的一些项目，为此，我在适配器中编写以下代码：
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private Context context;
private List<TvTonightResult> model;
public MyAdapter (Context context, List<TvTonightResult> model) {
this.context = context;
this.model = model;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_tv_tonight, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(MyAdapter.ViewHolder holder, final int position) {
holder.tvTonightTitle.setText(Html.fromHtml(model.get(position).getName()));
Glide.with(context)
.load(model.get(position).getImageUrl())
.placeholder(R.drawable.default_image)
.override(600, 900)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.listener(new RequestListener<String, GlideDrawable>() {
@Override
public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
return false;
}
@Override
public boolean onResourceReady(GlideDrawable resource, String model,
Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
return false;
}
})
.into(holder.tvTonightImage);
long time = 5 * 1000;
holder.tvTonightTimeCounter.start(time);
holder.tvTonightTimeCounter.setOnCountdownEndListener(new CountdownView.OnCountdownEndListener() {
@Override
public void onEnd(CountdownView cv) {
removeItem(position);
}
});
}
@Override
public int getItemCount() {
return 4;
}
public class ViewHolder extends RecyclerView.ViewHolder {
private ImageView tvTonightImage, tvTonightChannel;
private TextView tvTonightTitle, tvTonightDate;
private CountdownView tvTonightTimeCounter;
public ViewHolder(View itemView) {
super(itemView);
tvTonightImage = (ImageView) itemView.findViewById(R.id.row_tvTonightImage);
tvTonightChannel = (ImageView) itemView.findViewById(R.id.row_tvTonightChannelImage);
tvTonightTitle = (TextView) itemView.findViewById(R.id.row_tvTonightTitle);
tvTonightTimeCounter = (CountdownView) itemView.findViewById(R.id.row_tvTonightTime);
}
}
private void removeItem(int position) {
model.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, model.size());
}
}
我想在运行此代码时删除项目：
holder.tvTonightTimeCounter.setOnCountdownEndListener(new CountdownView.OnCountdownEndListener() {
@Override
public void onEnd(CountdownView cv) {
removeItem(position);
}
});
但请告诉我错误：
FATAL EXCEPTION: main
Process: com.example.app, PID: 9711
java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
at java.util.ArrayList.remove(ArrayList.java:477)
at com.example.app.Adapters.TvTonightAdapter.removeItem(TvTonightAdapter.java:102)
at com.example.app.Adapters.TvTonightAdapter.access$300(MyAdapter.java:29)
at com.example.app.Adapters.TvTonightAdapter$2.onEnd(MyAdapter.java:74)
at com.example.app.Utils.Componenets.CountDownTimer.CountdownView$1.onFinish(CountdownView.java:129)
at com.example.app.Utils.Componenets.CountDownTimer.CustomCountDownTimer$1.handleMessage(CustomCountDownTimer.java:74)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6247)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)
如何修复此错误并从recyclerview删除项目？
答案 0 :(得分：8)
试试吧，
int newPosition = holder.getAdapterPosition();
在你的removeItem（）方法中，并使用newPosition重新定位。
喜欢，
private void removeItem(int position) {
int newPosition = holder.getAdapterPosition();
model.remove(newPosition);
notifyItemRemoved(newPosition);
notifyItemRangeChanged(newPosition, model.size());
}
答案 1 :(得分：6)
我认为你应该拨打remove(holder.getAdapterPosition())而不是remove(position)，因为当持有人的倒计时结束时，它可能已经改变了它的位置。
假设以下情况：
1º持有人 - ＆gt; 5秒倒计时
2º持有人 - ＆gt; 10秒倒计时
由于第二个持有者在第一个持有者之后完成，在10秒之后，remove(1)将被调用，但是，由于第一个持有者已经被移除，所以第二个持有者的位置将为0.因此，它应该调用{ {1}}代替remove(0)（这将导致remove(1)）。
答案 2 :(得分：1)
删除Android中的Arraylist中的项目
holder.mRemoveButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Get the clicked item label
String itemLabel = mDataSet.get(position);
// Remove the item on remove/button click
mDataSet.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position,mDataSet.size());
// Show the removed item label`enter code here`
Toast.makeText(mContext,"Removed : " + itemLabel,Toast.LENGTH_SHORT).show();
}
答案 3 :(得分：0)
如果您只想显示4项只需更改获取计数方法，则无需删除项目
@Override
public int getItemCount() {
return (model.size()>4)?4:model.size();
}
答案 4 :(得分：0)
如果少于四个项目，如果有超过四个项目和确切数量的项目，则只显示四个项目。然后，你可以使用它：
@Override
public int getItemCount() {
int count = 0;
if (model != null && model.size() > 0) {
int listSize = model.size();
if (listSize > 4) {
count = 4;
} else {
count = listSize;
}
}
return count;
}
答案 5 :(得分：0)
//////// set the position ////////
holder.tvTonightTimeCounter.setTag(position);
//////// remove item from recyclerview and arraylist ///////
holder.tvTonightTimeCounter.setOnCountdownEndListener(new CountdownView.OnCountdownEndListener() {
@Override
public void onEnd(CountdownView cv) {
int positionToRemove = (int)view.getTag(); //get the position of view to delete stored in the tag
model.remove(positionToRemove);
notifyDataSetChanged();
}
});