Question

在我的应用程序中，顺利显示 CSV文件中的数据。但无法添加搜索功能。任何帮助将不胜感激。

如何实施getFilter().filter(s.toString())？

在主Java类中：

search_edit.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // Call back the Adapter with current character to Filter
            mAdapter.getFilter().filter(s.toString());


        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,int after) {
        }

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

我的适配器：

 public class CSVAdapter extends ArrayAdapter<State> {
    Context ctx;
    private static LayoutInflater inflater=null;


    public CSVAdapter(Context context, int textViewResourceId) {
        super(context, textViewResourceId);

        this.ctx = context;
        inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        loadArrayFromFile();
    }

    @Override
    public View getView(final int pos, View convertView, final ViewGroup parent){


        View rowView;
        rowView = inflater.inflate(R.layout.city_element, null);

        TextView city_name_txtObj=(TextView)rowView.findViewById(R.id.city_name_txt);
         city_name_txtObj.setText(getItem(pos).getName());

         return rowView;
    }


    private void loadArrayFromFile(){
        try {
            // Get input stream and Buffered Reader for our data file.
            InputStream is = null;
            try {
                is = ctx.getAssets().open("area.csv");
            } catch (IOException e) {
                e.printStackTrace();
            }
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            String line;

            //Read each line
            while ((line = reader.readLine()) != null) {

                //Split to separate the name from the capital
                String[] RowData = line.split(",");

                //Create a State object for this row's data.
                State cur = new State();
                cur.setName(RowData[1]);
                cur.setPin(RowData[2]);
                cur.setLocation(RowData[3]);
                cur.setLatitude(RowData[4]);
                cur.setLongitude(RowData[5]);

                //Add the State object to the ArrayList (in this case we are the ArrayList).
                this.add(cur);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


}

State是我的模特课：

  public class State {

    private String name,pinCode,location,latitude,longitude;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPin() { return pinCode;}
    public void setPin(String pinCode) {
        this.pinCode = pinCode;
    }

    public String getLocation() { return location;}
    public void setLocation(String location) {
        this.location = location;
    }

    public String getLatitude() { return latitude;}
    public void setLatitude(String latitude) {
        this.latitude = latitude;
    }

    public String getLongitude() { return longitude;}
    public void setLongitude(String longitude) {
        this.longitude = longitude;
    }


}

也许这个问题太基础了，但我找不到合适的解决方案。请帮帮我。

Answer 1

要进行过滤，您需要实施Filterable，还需要创建两个数据副本

 public class CSVAdapter extends ArrayAdapter<State>  implements Filterable {


@Override
public Filter getFilter() {
    if (valueFilter == null) {
        valueFilter = new ValueFilter();
    }
    return valueFilter;
}

private class ValueFilter extends Filter {
    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
        FilterResults results = new FilterResults();

        if (constraint != null && constraint.length() > 0) {
            ArrayList<Country> filterList = new ArrayList<Country>();
            for (int i = 0; i < mStringFilterList.size(); i++) {
                if ( (mStringFilterList.get(i).getName().toUpperCase() )
                        .contains(constraint.toString().toUpperCase())) {

                    Country country = new Country(mStringFilterList.get(i)
                            .getName() ,  mStringFilterList.get(i)
                            .getIso_code() ,  mStringFilterList.get(i)
                            .getFlag());

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

    }

    @Override
    protected void publishResults(CharSequence constraint,
            FilterResults results) {
        countrylist = (ArrayList<Country>) results.values;
        notifyDataSetChanged();
    }

完整示例Visit

ArrayAdapter搜索不起作用

1 个答案: