public class Const {
  public interface OrderInfo{
    public static final String[][] orderOne = new String[][] {{ "123", "九龙", "13294352311",
      "武汉市关山口" },{ "124", "咱家", "13294352312",
      "武汉市水果湖" },{ "125", "陈家", "13294352315",
      "武汉市华师" },{ "126", "李", "13294352316",
      "武汉市杨家湾" }};
  }
}

public class Order implements Serializable {
  public String id;
  public String restPhone;
  public String restName;
  public String receiverAddr;
  public Order(String id,String restPhone, String restName, String receiverAddr) {
    this.id = id;
    this.restPhone = restPhone;
    this.restName = restName;
    this.receiverAddr = receiverAddr;
  }
}

/** 获取SD可用容量 */
private static long getAvailableStorage(Context context) {
    String root = context.getExternalFilesDir(null).getPath();
    StatFs statFs = new StatFs(root);
    long blockSize = statFs.getBlockSize();
    long availableBlocks = statFs.getAvailableBlocks();
    long availableSize = blockSize * availableBlocks;
    // Formatter.formatFileSize(context, availableSize);
    return availableSize;
}

if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)&&getAvailableStorage()>1000000) {
  Toast.makeText(context, "SD卡不可用", Toast.LENGTH_LONG).show();
  return;
}
File file;
File dir = new File(context.getExternalFilesDir(null).getPath());
file = new File(dir, fileName + ".xls");
if (!dir.exists()) {
  dir.mkdirs();
}

WritableWorkbook wwb;
OutputStream os = new FileOutputStream(file);
wwb = Workbook.createWorkbook(os);

WritableSheet sheet = wwb.createSheet("订单", 0);

String[] title = { "订单", "店名", "电话", "地址" };
Label label;
for (int i = 0; i < title.length; i++) {
  // Label(x,y,z) 代表单元格的第x+1列，第y+1行, 内容z
        // 在Label对象的子对象中指明单元格的位置和内容
  label = new Label(i, 0, title[i], getHeader());
  // 将定义好的单元格添加到工作表中
  sheet.addCell(label);
}

public static WritableCellFormat getHeader() {
    WritableFont font = new WritableFont(WritableFont.TIMES, 10,
        WritableFont.BOLD);// 定义字体
    try {
      font.setColour(Colour.BLUE);// 蓝色字体
    } catch (WriteException e1) {
      e1.printStackTrace();
    }
    WritableCellFormat format = new WritableCellFormat(font);
    try {
      format.setAlignment(jxl.format.Alignment.CENTRE);// 左右居中
      format.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);// 上下居中
       format.setBorder(Border.ALL, BorderLineStyle.THIN,
       Colour.BLACK);// 黑色边框
       format.setBackground(Colour.YELLOW);// 黄色背景
    } catch (WriteException e) {
      e.printStackTrace();
    }
    return format;
}

for (int i = 0; i < exportOrder.size(); i++) {
      Order order = exportOrder.get(i);
      Label orderNum = new Label(0, i + 1, order.id);
      Label restaurant = new Label(1, i + 1, order.restName);
      Label nameLabel = new Label(2,i+1,order.restPhone);
      Label address = new Label(3, i + 1, order.receiverAddr);
      sheet.addCell(orderNum);
      sheet.addCell(restaurant);
      sheet.addCell(nameLabel);
      sheet.addCell(address);
      Toast.makeText(context, "写入成功", Toast.LENGTH_LONG).show();
}

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    int length = Const.OrderInfo.orderOne.length;
    for(int i = 0;i < length;i++){
      Order order = new Order( Const.OrderInfo.orderOne[i][0], Const.OrderInfo.orderOne[i][1], Const.OrderInfo.orderOne[i][2], Const.OrderInfo.orderOne[i][3]);
      orders.add(order);
    }
    btn = (Button)super.findViewById(R.id.btn);
    btn.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        try {
          ExcelUtil.writeExcel(MainActivity.this,
              orders, "excel_"+new Date().toString());
        } catch (Exception e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
    });
}