前言

最近接到需求，要在安卓上离线完成根据数据生成Excel文件，但搜到了都不是能立马使用

例如 

//    implementation 'org.apache.poi:poi:3.17'
//    implementation 'com.alibaba:easyexcel:4.0.1'

这两最大的问题是专用于java的，如果Android直接集成的话，会有一些“java.awt.Color”等类缺失的问题，应该是属于javase的一些内容。虽然看例子能直接使用 javabean

那我们只能退而求其次选择Android兼容性更高的

 implementation 'net.sourceforge.jexcelapi:jxl:2.6.12'

1，权限申请

    public static boolean verifyAllPermissions(Activity activity) {boolean write = verifyWrite(activity);if (write) {Log.i(TAG, "权限完整可以正常运行");return true;}Log.i(TAG, "开始请求权限");ActivityCompat.requestPermissions(activity,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},REQUEST_EXTERNAL_STORAGE);return false;}

 if (verifyAllPermissions) {testExcel()}

2，生成文件

  private fun testExcel() {val path = Environment.getExternalStorageDirectory().absolutePathLog.d("ExcelActivity", "path:$path")val directory ="$path/excel"val fileName = "/0726配餐simple.xlsx"val abFilePath = "$directory$fileName"Log.d("ExcelActivity", "directory:$directory")Log.d("ExcelActivity", "abFilePath:$abFilePath")val fileDirectory = File(directory)val file = File(abFilePath)try {if (!fileDirectory.exists()) {fileDirectory.mkdirs()Log.e("ExcelActivity", "路径不存在创建路径")}file.createNewFile();} catch (e: IOException) {Log.e("ExcelActivity", "createNewFile e:$e")e.printStackTrace()"创建文件失败$e".toast()return}Log.d("ExcelActivity", "文件创建成功:${file.absolutePath} ${file.exists()}")if (!file.exists()) {"文件不存在".toast()return}exportExcel(abFilePath)}

3，准备数据

class ExcelBean(var id: String, var name: String, var time: String, var date: String)......val dataList = arrayListOf<ExcelBean>()val titleList =arrayListOf("ID", "名称", "日期", "时间戳", "标题5", "标题6", "标题7", "标题8")
for (i in 0..60) {dataList.add(ExcelBean("$i","名字$i",System.currentTimeMillis().toString(),"${Date()}"))
}

4，写入文件

API支持的并不多，下面列举的常见的效果，其他API 网上有很多例子，本文旨在整个调通

fun exportExcel(filePath: String) {try {val dataList = arrayListOf<ExcelBean>()val titleList =arrayListOf("ID", "名称", "日期", "时间戳", "标题5", "标题6", "标题7", "标题8")for (i in 0..60) {dataList.add(ExcelBean("$i","名字$i",System.currentTimeMillis().toString(),"${Date()}"))}val workbook = Workbook.createWorkbook(File(filePath))// 设置sheet名称val sheet = workbook.createSheet("0726配餐", 0)// 合并单元格sheet.mergeCells(0, 0, titleList.size - 1, 0)sheet.mergeCells(0, 1, titleList.size - 1, 1)// 调整列宽sheet.setRowView(0, 800)sheet.setRowView(1, 600)sheet.setRowView(2, 500)//创建字体，参数1：字体样式，参数2：字号，参数3：粗体val font = WritableFont(WritableFont.createFont("宋体"), 18, WritableFont.BOLD);val wcTop = WritableCellFormat(font)wcTop.run {// 垂直居中alignment = Alignment.CENTREverticalAlignment = VerticalAlignment.CENTREwrap = true}// 顶部标题sheet.addCell(Label(0, 0, "陪餐记录导出表", wcTop))// 次级标题val wcTop2 = WritableCellFormat(WritableFont(WritableFont.createFont("宋体"),12))wcTop2.run {alignment = Alignment.CENTREverticalAlignment = VerticalAlignment.CENTREwrap = true}//X月X日-Y月Y日sheet.addCell(Label(0, 1, "(0801 - 0815)", wcTop2))// 内容标题栏val startRow = 3titleList.forEachIndexed { index, title ->run {val wc = WritableCellFormat(WritableFont(WritableFont.createFont("宋体"),12,WritableFont.BOLD))wc.run {verticalAlignment = VerticalAlignment.CENTREwrap = true}sheet.addCell(Label(index, startRow - 1, title, wc))}}// 内容dataList.forEachIndexed { index, excelBean ->run {val wc = WritableCellFormat()wc.wrap = trueval valueList = arrayListOf(excelBean.id,excelBean.name,excelBean.time,excelBean.date,"A","B","C","D")valueList.forEachIndexed { indexC, value ->sheet.addCell(Label(indexC, index + startRow, value, wc))}}}workbook.write()workbook.close()"导出成功:$filePath".toast()} catch (e: IOException) {e.printStackTrace()} catch (e: WriteException) {e.printStackTrace()}}