当回收视图正在计算布局或滚动时，尝试从回收视图中删除项目，无法调用此方法

我试图把我的项目从回收视图，但我总是得到错误

时不能调用此方法 “回收视图”正在计算布局或滚动

我正在使用通知数据更改，我可以解决这个问题吗？

public class AdapterIntransit extends RecyclerView.Adapter<AdapterIntransit.ViewHolder> {
private Context context;
List<DataIntransit> data;


public AdapterIntransit(Context context, List<DataIntransit> data) {
this.context = context;
this.data = data;
}


@Override
public AdapterIntransit.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardintransit, parent, false);
return new ViewHolder(itemView);
}


@Override
public void onBindViewHolder(AdapterIntransit.ViewHolder holder, int position) {
if (data.get(position).getJml1() - data.get(position).getJml2() <= 0) {
data.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, getItemCount());
notifyDataSetChanged();
} else {
holder.kode.setText(data.get(position).getKode());
holder.nama.setText(data.get(position).getNama());
holder.jumlah.setText(String.valueOf(data.get(position).getJml1() - data.get(position).getJml2()));
}
}


@Override
public int getItemCount() {
return data.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
TextView kode, nama, jumlah;
public ViewHolder(View itemView) {
super(itemView);
kode = (TextView)itemView.findViewById(R.id.kode);
nama = (TextView)itemView.findViewById(R.id.nama);
jumlah = (TextView)itemView.findViewById(R.id.jumlah);


}
}
}
87180 次浏览
小开

I give you another idea for solve your problem. I think it could be better The idea is we do not remove invalid data inside onBindViewHolder, we will remove it before 

public AdapterIntransit(Context context, List < DataIntransit > data) {
this.context = context;
this.data = removeInValidData(data);
}


private void removeInValidData(List < DataIntransit > data) {
for (int position = 0, position < data.size(); position++) {
if (data.get(position).getJml1() - data.get(position).getJml2() <= 0) {
data.remove(position);
}
}
}


@Override
public void onBindViewHolder(AdapterIntransit.ViewHolder holder, int position) {
holder.kode.setText(data.get(position).getKode());
holder.nama.setText(data.get(position).getNama());
holder.jumlah.setText(String.valueOf(data.get(position).getJml1() - data.get(position).getJml2()));


}
小开
最佳答案

Below answer worked for me

This is just workaround for the problem.

This usually occurs when you are calling notifyDataSetChanged() on the background thread. So just move notify to UI thread

recyclerView.post(new Runnable()
{
@Override
public void run() {
myadapter.notifyDataSetChanged();
}
});

You use your RecyclerView instance and inside the post method a new Runnable added to the message queue. The runnable will be run on the user interface thread. This is a limit for Android to access the UI thread from background (e.g. inside a method which will be run in a background thread). for more you run it on UI thread if you needed.

For more you can run it on UI thread, if you needed

 runOnUiThread(new Runnable(){
public void run() {
// UI code goes here
}
});
小开

This is useful when select All checkbox on click of top checkbox in recyclerview.

recyclerview.post(new Runnable()
{
@Override
public void run() {
myadapter.notifyDataSetChanged();
}
});
小开

You are notifying about item change inside onBindViewHolder() method, when your item in process of construction. Most probably you can just improve your logic, to avoid this.

小开

If you are tyring to notify recylew item then use isComputingLayout method:

if (!mRecyclerView.isComputingLayout())
{
// add your code here
}
小开

There are two methods you need for this to work:

if (!rv.isComputingLayout && rv.scrollState == SCROLL_STATE_IDLE) {
rv.adapter?.notifyDataSetChanged()
}
小开

When recycler view is computing layout,if we try to notify item change or data change, this issue occurs. But as per official documentation,it is written as

It is very unlikely that your code will be running during state(isComputingLayout) as it is called by the framework when a layout traversal happens or RecyclerView starts to scroll in response to system events (touch, accessibility etc).

But sometimes this issue happens leading to crash.So,better to follow as below.

if (isComputingLayout(recyclerView).not()) {
if (Looper.myLooper() != Looper.getMainLooper()) {
// If BG thread,then post task to recycler view
recyclerView?.post { notifyItemChanged(position, obj) }
} else {
notifyItemChanged(position, obj)
}
}
小开

The method that worked for me the best is this

    if (this@[AdapterName].hasStableIds())
{
notifyItemChanged(position)
}

It check whether the id's has been set or not then only it updates the position

小开

just override this 2 fun in your recycler view

override fun getItemId(position: Int): Long {
return position.toLong()
}


override fun getItemViewType(position: Int): Int {
return position
}
小开

For some reason, doing

recyclerView.post(new Runnable() {
@Override
public void run() {
adapter.notifyDataSetChanged();
}
});

didn't work for me. I had to use postDelayed function to finally make it work for my scenario.

recyclerView.postDelayed(
() -> adapter.notifyItemChanged(itemChangedIndex)),
500
);

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