带搜索过滤器空指针的RecyclerView

Question

试图在其中找到空指针。直到我对列表实现了on click侦听器之前，它都运行良好。 Android开发的新手，谢谢您的评论。

这是主要活动

import arcpy

#First check to see if the covered_routes field exists yet
if len(arcpy.ListFields(Metro_Stops,"covered_routes")) > 0: 
    arcpy.DeleteField_management(Metro_Stops_Buffer, "covered_routes")
    arcpy.AddField_management(Metro_Stops_Buffer, "covered_routes", "string")
else:
    arcpy.AddField_management(Metro_Stops_Buffer, "covered_routes", "string") 

#Delete Extra Layers
arcpy.Delete_management('Metro_Routes_lyr')
arcpy.Delete_management('Metro_Stops_Buffer_lyr')

#A Cursor that runs through each Stop.
with arcpy.da.UpdateCursor(Metro_Stops_Buffer, ("covered_routes","SHAPE@")) as cursor:
    for row in cursor:
        routes = []
        clean_row = '{}'.format(row[0])

        #Create the layers to work with from the GDB.
        arcpy.MakeFeatureLayer_management(Metro_Stops_Buffer, 'Metro_Stops_Buffer_lyr')
        arcpy.MakeFeatureLayer_management(Metro_Routes, 'Metro_Routes_lyr')

        #Select the routes that intersect the stop (row)
        arcpy.SelectLayerByLocation_management('Metro_Routes_lyr', "INTERSECT", row[1])

        #Given the selected routes, create a new cursor that will return the route name (route_long) for each.
        with arcpy.da.SearchCursor('Metro_Routes_lyr', "route_long") as cursor2:
            for j in cursor2:
                clean_j = '{}'.format(j[0])
                print(clean_j)
                routes.append(clean_j)
                print(routes)

                #Insert the routes into the "covered_routes" field. 
                row[0] = str(routes)
                cursor.updateRow(row)
        del(routes)
        #Remove the unnecessary layers
        arcpy.Delete_management('Metro_Routes_lyr')
        arcpy.Delete_management('Metro_Stops_Buffer_lyr')

这是它的适配器：

public class CoachActivity extends AppCompatActivity {

EditText sv;
private ArrayList<Swimmer> mSwimmers;

private RecyclerView mRecyclerView;
private MyAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.master_coach);

    getSwimmers();
    buildRecyclerView();

    EditText editText = findViewById(R.id.mSearch);
    editText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            filter(s.toString());
        }
    });
}

private void filter(String text) {
    ArrayList<Swimmer> filteredList = new ArrayList<>();

    for (Swimmer item : mSwimmers) {
        if (item.getmSwimmerName().toLowerCase().contains(text.toLowerCase())) {
            filteredList.add(item);
        }
    }

    mAdapter.filterList(filteredList);
}

//ADD PLAYERS TO ARRAYLIST
private void getSwimmers()
{
    mSwimmers = new ArrayList<>();
    mSwimmers.add(new Swimmer("Johnny"));
    mSwimmers.add(new Swimmer("Trinity"));
    mSwimmers.add(new Swimmer("NEO"));
}

private void buildRecyclerView() {
    mRecyclerView = findViewById(R.id.myRecycler);
    mRecyclerView.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(this);
    //mAdapter = new MyAdapter(mSwimmers);

    mRecyclerView.setLayoutManager(mLayoutManager);
    mRecyclerView.setAdapter(mAdapter);
    mRecyclerView.setAdapter(new MyAdapter(mSwimmers, new MyAdapter.ItemClickListener() {
        @Override public void onItemClick(Swimmer swimmer) {
            Toast.makeText(getBaseContext(), "Item Clicked", Toast.LENGTH_LONG).show();
            //                    call the progression fragment
                    Fragment fragment = ProgressionFragment.newInstance();
                    FragmentManager fm = getSupportFragmentManager();
                    fm.beginTransaction()
                        .add(R.id.fragment_container_detail, fragment)
                        .commit();
        }
    }));
}

}

当我添加OnClickListener来启动片段时，是空指针发生的时间。这是错误：

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ExampleViewHolder> {

public interface ItemClickListener {
    void onItemClick(Swimmer item);
}

private ArrayList<Swimmer> swimmers;
private final ItemClickListener listener;

public MyAdapter(ArrayList<Swimmer> swimmers, ItemClickListener listener) {
    this.swimmers = swimmers;
    this.listener = listener;
}

public static class ExampleViewHolder extends RecyclerView.ViewHolder {
    public TextView mTextView1;

    public ExampleViewHolder(View itemView) {
        super(itemView);

        mTextView1 = itemView.findViewById(R.id.nameTxt);

    }

    public void bind(final Swimmer swimmer, final ItemClickListener listener) {
        mTextView1.setText(swimmer.getmSwimmerName());
        itemView.setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v) {
                listener.onItemClick(swimmer);

            }
        });
    }

}

@Override
public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.model,
            parent, false);
    ExampleViewHolder evh = new ExampleViewHolder(v);
    return evh;
}


@Override
public void onBindViewHolder(ExampleViewHolder holder, int position) {
    Swimmer currentItem = swimmers.get(position);

    holder.mTextView1.setText(currentItem.getmSwimmerName());
    holder.bind(swimmers.get(position), listener);

}

@Override
public int getItemCount() {
    return swimmers.size();
}

public void filterList(ArrayList<Swimmer> filteredList) {
    swimmers = filteredList;
    notifyDataSetChanged();
}


}