Displaying toast from a non activity class

I want to display toasts from a non-activity class which is my RecyclerView Adapter.

What can I do to achieve this?

I want to set toasts in the onLoadingStateChanged() switch statements.

I have tried some old codes but they don't seem to work.

I don't want RecylerView Adapter to be in the MainActivity

My Adapter Activity:

public class TalesAdapter extends FirestorePagingAdapter<TalesDetails, TalesAdapter.TalesViewHolder> {
public TalesAdapter(@NonNull FirestorePagingOptions<TalesDetails> options) {
super(options);
}
@Override
protected void onBindViewHolder(@NonNull TalesViewHolder holder, int position, @NonNull TalesDetails model) {
holder.bind(model);
}
@NonNull
@Override
public TalesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.talesrecyclerview, parent, false);
return new TalesViewHolder(view);
}
@Override
protected void onLoadingStateChanged(@NonNull LoadingState state) {
switch (state) {
case LOADING_INITIAL:
case LOADING_MORE:
//toast here
break;
case LOADED:
//toast here
case FINISHED:
//toast here
break;
case ERROR:
//toast here
break;
}
}
public class TalesViewHolder extends RecyclerView.ViewHolder  {
private TextView Title;
private TextView Matter;
private TextView Name;
public TalesViewHolder(View itemView ) {
super(itemView);
Name = itemView.findViewById(R.id.tvName);
Title = itemView.findViewById(R.id.tvTitle);
Matter = itemView.findViewById(R.id.tvMatter);
}
public void bind(TalesDetails tales){
Name.setText(tales.name);
Title.setText(tales.title);
Matter.setText(tales.matter);
}
}
}

You have two possibilities :

1 - Create Context variable

private Context context;
public TalesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
context = parent.getContext();
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.talesrecyclerview, parent, false);
return new TalesViewHolder(view);
}

2 - Using implementation 'com.blankj:utilcodex:1.29.0'

ToastUtils.showShort("YOUR TEXT HERE");

Declare a Variable type of YourActivity class and pass the activity reference by the time of constructing TalesAdapter

public class TalesAdapter extends FirestorePagingAdapter<TalesDetails, TalesAdapter.TalesViewHolder> {
Context mContext = null;
public TalesAdapter(@NonNull FirestorePagingOptions<TalesDetails> options, Context mContext) {
this.mContext = mContext;
super(options);
}
@Override
protected void onLoadingStateChanged(@NonNull LoadingState state) {
switch (state) {
case LOADING_INITIAL:
case LOADING_MORE:
Toast.makeText(mContext, "your message", Toast.LENGTH_SHORT).show()
break;
case LOADED:
//toast here
case FINISHED:
//toast here
break;
case ERROR:
//toast here
break;
}
}
}

You can Create a Constructor in the Adapter
Like:

Context mContext;
public TalesAdapter(@NonNull FirestorePagingOptions<TalesDetails> options, Context mContext) {
this.mContext = mContext;
super(options);
}
@Override   
protected void onLoadingStateChanged(@NonNull LoadingState state) {
switch (state) {
case LOADING_INITIAL:
case LOADING_MORE:
Toast.makeText(mContext, "Taost", Toast.LENGTH_SHORT).show();
break;
case LOADED:
Toast.makeText(mContext, "Taost", Toast.LENGTH_SHORT).show();
break;
case FINISHED:
Toast.makeText(mContext, "Taost", Toast.LENGTH_SHORT).show();
break;
case ERROR:
Toast.makeText(mContext, "Taost", Toast.LENGTH_SHORT).show();
break;
}
}

And in your Activity whether it is MainActivity.java or any while this Adapter in RecyclerView or ListView

Context mContext = this;
adapter = new TalesAdapter(mContext);
mRecycler.setAdapter(adapter)