Question

目前，我正在尝试在Android Studio中创建一个移动应用程序，允许用户输入ISBN号，当点击搜索按钮时，它将搜索原始文件夹中的CSV并返回该ISBN查询的结果。此CSV文件包含与以逗号分隔的该号码相关联的所有其他信息。目前，它将CSV文件的所有结果返回到用户界面上的编辑文本字段中。如何更改我的代码只返回我想要的特定结果？

这是readFile类：

public class readFile {


 InputStream inputStream;

    public readFile(InputStream inputStream){
        this.inputStream = inputStream;
    }

    public List<String[]> read(){
        List<String[]> resultList = new ArrayList<String[]>();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        try {
            String csvLine;
            while ((csvLine = reader.readLine()) != null) {
                String[] row = csvLine.split(",");
                resultList.add(row);
            }
        }
        catch (IOException ex) {
            throw new RuntimeException("Error in reading CSV file: "+ex);
        }
        finally {
            try {
                inputStream.close();
            }
            catch (IOException e) {
                throw new RuntimeException("Error while closing input stream: "+e);
            }
        }
        return resultList;
    }
}

itemArrayAdapter类：

public class ItemArrayAdapter extends ArrayAdapter<String[]> {


private List<String[]> scoreList = new ArrayList<String[]>();

    static class ItemViewHolder {
        EditText title, publicationPlace,publicationDate,edition,author;
    }

    public ItemArrayAdapter(Context context, int textViewResourceId) {
        super(context, textViewResourceId);
    }

    @Override
    public void add(String[] object) {
        scoreList.add(object);
        super.add(object);
    }

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

    @Override
    public String[] getItem(int index) {
        return this.scoreList.get(index);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        ItemViewHolder viewHolder;
        if (row == null) {
            LayoutInflater inflater = (LayoutInflater) this.getContext().
                    getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(R.layout.item_layout, parent, false);
            viewHolder = new ItemViewHolder();
            viewHolder.title = (EditText) row.findViewById(R.id.title);
            viewHolder.publicationDate = (EditText) row.findViewById(R.id.publicationDate);
            viewHolder.publicationPlace = (EditText) row.findViewById(R.id.publicationPlace);
            viewHolder.edition = (EditText) row.findViewById(R.id.edition);
            viewHolder.author = (EditText) row.findViewById(R.id.authors);
            row.setTag(viewHolder);
        } else {
            viewHolder = (ItemViewHolder)row.getTag();
        }
        String[] isbn = getItem(position);
        viewHolder.title.setText(isbn[1]);
        viewHolder.publicationDate.setText(isbn[2]);
        viewHolder.publicationPlace.setText(isbn[3]);
        viewHolder.edition.setText(isbn[4]);
        viewHolder.author.setText(isbn[5]);

        return row;
    }
}

Answer 1

[...代码...]

String[] row = csvLine.split(",");

// Add the check as shown here:
for ( int col = 0; col < row.length; col++ ) {    // this could be avoided
    if ( row[col].compareTo(ISBN_string) == 0 )
       resultList.add(row);
}
// Maby if you know the column no. you can get away without the iteration

// resultList.add(row);  <-- this is now obsolete

[...更多代码...]

在CSV文件中搜索用户输入的特定字符串？

1 个答案: