我想知道是否有一些函数返回类似于iOS中size of NSString的字符串大小？
实施例。我们需要在屏幕底部有一些Widget，首先我们应该只看到文本但是在用户拉出那个小部件后，我们会看到更多（类似于底页）。小部件的起始高度取决于字符串。
答案 0 :(得分：1)
查看import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ReadWriteExcel {
static Map<Integer, String> header = new LinkedHashMap<Integer, String>();
public List<LinkedHashMap<String, Object>> readExcel(String excelNameWithPath) {
List<LinkedHashMap<String, Object>> tempList;
XSSFWorkbook wb;
int checkRow = 0;
tempList = new ArrayList<LinkedHashMap<String, Object>>();
try {
wb = new XSSFWorkbook(excelNameWithPath);
// Iterate excel data row and cell wise for storing purpose in map.
for (Row row : wb.getSheetAt(0)) {
// If checkRow is 0, storing data into static variable
// header.(as first row is header in every excel file.)
if (checkRow == 0) {
int indexMap = 0;
for (Cell cell : row) {
header.put(indexMap, cell.getRichStringCellValue().getString());
indexMap++;
}
checkRow++;
continue;
}
Map<String, Object> tempMap = new LinkedHashMap<String, Object>();
for (Cell cell : row) {
if (header.get(cell.getColumnIndex()) != null) {
// System.out.println("cell.getCellTypeEnum() -->"+cell.getCellTypeEnum());
switch (cell.getCellTypeEnum()) {
case STRING:
tempMap.put(header.get(cell.getColumnIndex()), cell.getRichStringCellValue().getString());
// System.out.println("header.get(cell.getColumnIndex()) -->"+header.get(cell.getColumnIndex()));
break;
case NUMERIC:
if (org.apache.poi.ss.usermodel.DateUtil.isCellDateFormatted(cell))
tempMap.put(header.get(cell.getColumnIndex()), cell.getDateCellValue());
else
tempMap.put(header.get(cell.getColumnIndex()), (int) cell.getNumericCellValue());
// System.out.println("header.get(cell.getColumnIndex()) -->"+header.get(cell.getColumnIndex()));
break;
case FORMULA:
tempMap.put(header.get(cell.getColumnIndex()), cell.getCellFormula());
break;
default:
break;
}
}
}
tempList.add((LinkedHashMap<String, Object>) tempMap);
}
} catch (EncryptedDocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//System.out.println("Temp List data -->"+tempList);
return tempList;
}
public XSSFWorkbook writeExcel(List<LinkedHashMap<String, Object>> myMap) {
int rowNum = 0;
int cellNum = 0;
System.out.println("Entered into WriteExcel");
// Get workbook and sheet for processing.
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("Output");
// Add header in newly created file.
Row rowHeader = sheet.createRow(rowNum++);
for (Integer Key : header.keySet()) {
Cell cell = rowHeader.createCell(cellNum++);
cell.setCellValue((String) (header.get(Key)));
}
// Iterate list one by one and get data saved in map. Calculate writing
// factor based on settle position.
// Writing factor = Settle Position / 1000.
for (Map<String, Object> m : myMap) {
Set<String> keyset = m.keySet();
for (String key : keyset) {
if (key.equals("SETTLE POSITIONS")) {
int settleNum = (Integer) m.get(key);
settleNum = settleNum / 1000;
for (int i = 0; i < settleNum; i++) {
Row row = sheet.createRow(rowNum++);
cellNum = 0;
for (String key1 : keyset) {
Cell cell = row.createCell(cellNum++);
if (m.get(key1) instanceof Date) {
cell.setCellValue((Date) (m.get(key1)));
} else if (m.get(key1) instanceof String) {
cell.setCellValue((String) (m.get(key1)));
} else if (m.get(key1) instanceof Integer) {
cell.setCellValue((Integer) (m.get(key1)));
} else if (m.get(key1) instanceof Boolean) {
cell.setCellValue((Boolean) (m.get(key1)));
}
}
}
}
}
}
return workbook;
}
public long totalPositions(List<LinkedHashMap<String, Object>> excelDataList) {
long totalPositions = 0L;
for (Map<String, Object> m : excelDataList) {
Set<String> keyset = m.keySet();
for (String key : keyset) {
if (key.equals("SETTLE POSITIONS")) {
int settleNum = (Integer) m.get(key);
totalPositions+=settleNum;
}
}
}
System.out.println("Total Position : "+totalPositions);
return totalPositions;
}
public void exportSelectedAccounts(Map<Integer, Integer> selectedAccounts, XSSFWorkbook tmpWorkbook) {
XSSFWorkbook workbook = tmpWorkbook;
XSSFSheet sheet = workbook.getSheetAt(0);
XSSFWorkbook newWorkbook = new XSSFWorkbook();
XSSFSheet newSheet = newWorkbook.createSheet("Final");
XSSFRow srcRow, destRow;
for (int i=1; i<=selectedAccounts.size(); i++){
for(Integer record : selectedAccounts.values()){
// System.out.println("Selected Row for Lottery :"+ record);
srcRow= sheet.getRow(record);
// System.out.println("Accounts Selected for lottery : "+ srcRow);
destRow= newSheet.createRow(i);
}
}
}
}
它允许孩子先被放置然后你可以根据它的大小定位