基本适配器未正确过滤

Question

我有一个使用基本适配器的列表视图，这是我初始化它的方式：

if (mBuses.size() < 1) {
    // Initialising and loading data into adapter
    mBuses = buses;
    mBusesAdapter = new BusesArrayAdapter(BusesActivity.this, mBuses);
    mBusesView.setAdapter(mBusesAdapter);
} else {
    mBuses.addAll(buses);
    mBusesAdapter.notifyDataSetChanged();
}

我正在使用侦听器检查用户何时滚动到底部，它会从服务器获取更多数据并附加到现有数据集，而不是使用分页。每页加载 100 个项目。

现在我的问题是，当我尝试过滤数据时，它总是只过滤前 100 项，不包括其他项。

这是我的基本适配器：

public class BusesArrayAdapter extends BaseAdapter implements Filterable {

    private Context context;
    private int altColour;
    private ArrayList<BusModel> buses;
    private BusModel bus;
    private ValueFilter valueFilter;
    private ArrayList<BusModel> filterList;

    private static class ViewHolder{
        RelativeLayout container;
        TextView id;
        TextView busType;
        TextView registrationNo;
        TextView vehicleModel;
        TextView driverName;
        TextView driverContact;
        ImageButton btnEdit;
        ImageButton btnRemove;
    }

    public BusesArrayAdapter(@NonNull Context context, @NonNull ArrayList<BusModel> buses) {
        this.context = context;
        this.buses = buses;
        this.filterList = new ArrayList<>(buses);
    }

    @Override
    public int getCount() {
        return buses.size();
    }

    @Override
    public BusModel getItem(int position) {
        return buses.get(position);
    }

    @Override
    public long getItemId(int position) {
        return getItem(position).getId();
    }

    public void remove(BusModel bus) {
        buses.remove(bus);
    }

    @NonNull
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public View getView(final int position, View convertView, @NonNull ViewGroup parent) {
        // Get the data item for this position
        bus = getItem(position);

        // Check if an existing view is being reused, otherwise inflate the view
        final ViewHolder viewHolder; // view lookup cache stored in tag
        if (convertView == null) {
            // If there's no view to re-use, inflate a brand new view for row
            viewHolder = new ViewHolder();
            LayoutInflater inflater = LayoutInflater.from(context);
            convertView = inflater.inflate(R.layout.row_buses, parent, false);
            viewHolder.container = (RelativeLayout) convertView.findViewById(R.id.row_buses_ll_container);
            viewHolder.id = (TextView) convertView.findViewById(R.id.row_buses_tv_id);
            viewHolder.busType = (TextView) convertView.findViewById(R.id.row_buses_tv_bus_type);
            viewHolder.registrationNo = (TextView) convertView.findViewById(R.id.row_buses_tv_registration_no);
            viewHolder.vehicleModel = (TextView) convertView.findViewById(R.id.row_buses_tv_vehicle_model);
            viewHolder.driverName = (TextView) convertView.findViewById(R.id.row_buses_tv_driver_name);
            viewHolder.driverContact = (TextView) convertView.findViewById(R.id.row_buses_tv_driver_contact);
            viewHolder.btnEdit = (ImageButton) convertView.findViewById(R.id.row_buses_btn_edit);
            viewHolder.btnEdit.setTag(position);
            viewHolder.btnRemove = (ImageButton) convertView.findViewById(R.id.row_buses_btn_trash);
            viewHolder.btnRemove.setTag(position);

            // Cache the viewHolder object inside the fresh view
            convertView.setTag(viewHolder);
        } else {
            // View is being recycled, retrieve the viewHolder object from tag
            viewHolder = (ViewHolder) convertView.getTag();
        }
        // Populate the data from the data object via the viewHolder object
        // into the template view.

        if (altColour == 0) {
            viewHolder.container.setBackgroundColor(Color.parseColor("#FFFFFF"));
            altColour = 1;
        } else {
            viewHolder.container.setBackgroundColor(Color.parseColor("#EFEFEF"));
            altColour = 0;
        }

        viewHolder.id.setText(String.valueOf(bus.getId()));
        viewHolder.busType.setText(bus.getBusType());
        viewHolder.registrationNo.setText(bus.getRegistrationNo());
        viewHolder.vehicleModel.setText(bus.getVehicleModel());
        viewHolder.driverName.setText(bus.getDriverName());
        viewHolder.driverContact.setText(bus.getDriverContact());
        viewHolder.btnEdit.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                int position = Integer.parseInt(viewHolder.btnRemove.getTag().toString());
                BusModel bus = getItem(position);

                if (bus != null) {
                    Intent editBusIntent = new Intent(context, EditBusActivity.class);
                    editBusIntent.putExtra("bus", bus);
                    ((Activity) context).startActivityForResult(editBusIntent, 200);
                }
            }
        });

        viewHolder.btnRemove.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                int position = Integer.parseInt(viewHolder.btnRemove.getTag().toString());
                removeBus(position);
            }

        });

        // Return the completed view to render on screen
        return convertView;
    }

    private void removeBus(final int position) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);

        builder.setTitle("Confirm");
        builder.setMessage("Are you sure you want to delete this item?");

        builder.setPositiveButton("YES", new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog, int which) {
                BusesRequest busesRequest = new BusesRequest(context);
                busesRequest.remove(getItem(position).getId(), mTrashOnSuccessListener, mTrashOnErrorListener);

                remove(getItem(position));
                notifyDataSetChanged();
            }

        });

        builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // Do nothing
                dialog.dismiss();
            }
        });
        AlertDialog alert = builder.create();
        alert.show();
    }

    private Response.Listener<JSONObject> mTrashOnSuccessListener = new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            //
        }
    };

    Response.ErrorListener mTrashOnErrorListener = new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Utils.showNetworkResponse(context, error);
        }
    };

    @Override
    public Filter getFilter() {
        // TODO Auto-generated method stub
        if (valueFilter == null) {

            valueFilter = new ValueFilter();
        }

        return valueFilter;
    }

    private class ValueFilter extends Filter {

        //Invoked in a worker thread to filter the data according to the constraint.
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();
            if(constraint != null && constraint.length() > 0){
                ArrayList<BusModel> filterList = new ArrayList<BusModel>();
                for(int i = 0; i < BusesArrayAdapter.this.filterList.size(); i++)
                {
                    BusModel bus = BusesArrayAdapter.this.filterList.get(i);

                    if((bus.getRegistrationNo().toLowerCase())
                            .contains(constraint.toString().toLowerCase())
                            || (bus.getDriverName().toLowerCase())
                            .contains(constraint.toString().toLowerCase()) ) {

                        filterList.add(new BusModel(
                                bus.getId(),
                                bus.getBusType(),
                                bus.getRegistrationNo(),
                                bus.getVehicleModel(),
                                bus.getDriverName(),
                                bus.getDriverContact()
                        ));

                    }
                }

                results.count = filterList.size();
                results.values = filterList;
            } else{
                results.count = filterList.size();
                results.values = filterList;
            }
            return results;
        }


        //Invoked in the UI thread to publish the filtering results in the user interface.
        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint,
                                      FilterResults results) {
            buses = (ArrayList<BusModel>) results.values;
            notifyDataSetChanged();
        }
    }
}

Answer 1

因为 filterList 在创建 Adapter 的实例时只初始化一次。你还必须在 filterList 中放入新的 100 件物品。

this.filterList = new ArrayList<>(buses);

当您创建这样的新实例时，仅存储 100 条记录。

mBusesAdapter = new BusesArrayAdapter(BusesActivity.this, mBuses);

也尝试添加每个获取的项目filterList。

基本适配器未正确过滤

Base Adapter Not Filtering Properly

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baseadapter