https://blog.csdn.net/liminwu_6/article/details/72983810
Android 读写 Excel 文件
需求背景：最近在做项目过程中，需要读取 Excel 文件，Excel文件可以来自用户插在Android设备上的外接U盘，也可以是保存在项目Assets、 Raw里面。
资料参考：查阅了很多相关资料，读取外接U盘主要用到了Android 读取USB文件的第三方开源库
[GitHub]（https://github.com/magnusja/libaums）
用到的Jar文件 Jar
读写Asset Raw文件也可以用jxl.jar
本文将从以下两个方面介绍Excel文件的读写
读写外接 U 盘文件
读写Android 项目内Assets Raw 下的 Excel 文件
Android 读写 U 盘 Excel 文件
首先我们需要注册广播监听外接U盘的插入和拔出
//监听OTG插入 拔出
IntentFilter usbDeviceStateFilter = new IntentFilter(); usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
usbDeviceStateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
registerReceiver(mUsbReceiver, usbDeviceStateFilter);
//注册监听自定义广播
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
然后重写onReceive()方法
private BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
switch (action) {
case ACTION_USB_PERMISSION://接受到自定义广播
UsbDevice usbDevice = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) { //允许权限申请
if (usbDevice != null) { //Do something
readDevice(getUsbMass(usbDevice));
} else {
}
} else {
setMsg("用户未授权，读取失败");
}
break;
case UsbManager.ACTION_USB_DEVICE_ATTACHED://接收到存储设备插入广播
UsbDevice device_add = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (device_add != null) {
redDeviceList();
} else {
}
break;
case UsbManager.ACTION_USB_DEVICE_DETACHED://接收到存储设备拔出广播
UsbDevice device_remove = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (device_remove != null) {
usbFiles.clear();//清除
adapter.notifyDataSetChanged();//更新界面
cFolder = null;
}
break;
}
}
};
接收到有U盘插入之后我们要对U盘设备进行一些初始化相关的操作
private void readDevice(UsbMassStorageDevice device) {
// before interacting with a device you need to call init()!
try {
device.init();//初始化
// Only uses the first partition on the device
Partition partition = device.getPartitions().get(0);
FileSystem currentFs = partition.getFileSystem();
//fileSystem.getVolumeLabel()可以获取到设备的标识
//通过FileSystem可以获取当前U盘的一些存储信息，包括剩余空间大小，容量等等
// Log.d(TAG, "Capacity: " + currentFs.getCapacity());
// Log.d(TAG, "Occupied Space: " + currentFs.getOccupiedSpace());
// Log.d(TAG, "Free Space: " + currentFs.getFreeSpace());
// Log.d(TAG, "Chunk size: " + currentFs.getChunkSize());
UsbFile root = currentFs.getRootDirectory();//获取根目录
deviceName = currentFs.getVolumeLabel();//获取设备标签
mMainTvTitle.setText(deviceName);//设置标题
cFolder = root;//设置当前文件对象
addFile2List();//添加文件
} catch (Exception e) {
e.printStackTrace();
setMsg("读取失败，异常：" + e.getMessage());
}
}
private void redDeviceList() {
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
//获取存储设备
storageDevices = UsbMassStorageDevice.getMassStorageDevices(this);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
for (UsbMassStorageDevice device : storageDevices) {//可能有几个 一般只有一个 因为大部分手机只有1个otg插口
if (usbManager.hasPermission(device.getUsbDevice())) {//有就直接读取设备是否有权限
readDevice(device);
} else {//没有就去发起意图申请
usbManager.requestPermission(device.getUsbDevice(), pendingIntent); //该代码执行后，系统弹出一个对话框，
}
}
if (storageDevices.length == 0)
setMsg("请插入U盘读取xxx");
}
当Android设备读取到U盘文件后，会显示出所有的文件夹及文件，因为我们只能对Excel文件进行操作处理，所以还要对用户选择的文件做判断处理
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//点击item 进入该目录
final UsbFile file = usbFiles.get(position);
d(file.getName());
if (file.isDirectory()) {//如果是文件夹
cFolder = file;
mMainTvTitle.append("/" + cFolder.getName());
addFile2List();
} else {
if (file.getName().startsWith("._")) {
toastShort("请选择正确的Excel文件");
return;
}
if (file.getName().endsWith(".xls") || file.getName().endsWith(".xlsx")) {
//设置视图
dialog_wait.setMessage("正在读取" + file.getName() + "...");
dialog_wait.show();
//执行线程
executorService.execute(new Runnable() {
@Override
public void run() {
try {
Looper.prepare();
ExcelUtils.readFromExcel(file, mHandler);
Looper.loop();
} catch (final Exception e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
dialog_wait.dismiss();
}
});
}
}
});
} else {
toastShort("请选择Excel文件进行操作");
return;
}
}
}
接下来我们就需要对选择的Excel文件进行读取操作
public static void readFromExcel(final UsbFile fileAbsolutePath, final Handler handler) throws IOException {
new Thread(new Runnable() {
@Override
public void run() {
/**
* 读取Excel表中的所有数据
*/
Workbook workbook = null;
try {
workbook = getWeebWork(fileAbsolutePath);
} catch (IOException e) {
e.printStackTrace();
}
Logger.d("总表页数为：" + workbook.getNumberOfSheets());// 获取表页数
Sheet sheet = workbook.getSheetAt(0);
int sheetNum = workbook.getNumberOfSheets();
int sheetRows = sheet.getLastRowNum();
Logger.d("the num of sheets is " + sheetNum);
Logger.d("the name of sheet is " + sheet.getSheetName());
Logger.d("total rows is 行=" + sheetRows);
// Sheet sheet = workbook.getSheetAt(1);
int rownum = sheet.getLastRowNum();// 获取总行数
Logger.d(rownum);
double sum = 0;
List<SubsidyEntity> subsidyEntities = new ArrayList<SubsidyEntity>();
for (int i = 1; i <= rownum; i++) {//21
Row row = sheet.getRow(i);
int columns = row.getLastCellNum();// 总列数
Logger.t("总列数").d(columns);
for (int j = row.getFirstCellNum(); j < row.getLastCellNum(); j++) {
Cell celldata = row.getCell(j);
Logger.t("getColumnIndex").d(celldata.getColumnIndex());
Logger.t("cellData").d(celldata);
SubsidyEntity subsidyEntity = new SubsidyEntity();
switch (celldata.getColumnIndex()) {
//证件号码
case 0:
// subsidyEntity.setSubsidyIDNo(celldata.toString());
Logger.t("证件号码").d(celldata.toString());
break;
//用户姓名
case 1:
// subsidyEntity.setSubsidyName(celldata.toString());
Logger.t("用户姓名").d(celldata.toString());
break;
//补贴金额
case 2:
subsidyEntity.setSubsidyAmt(celldata.toString());
Logger.t("补贴金额").d(celldata.toString());
subsidyEntities.add(subsidyEntity);
break;
case 3:
break;
}
}
}
for (int j = 0; j < subsidyEntities.size(); j++) {
Logger.d(subsidyEntities.size());
SubsidyEntity cellData = subsidyEntities.get(j);
Logger.d(cellData.getSubsidyAmt());
sum += Double.valueOf(String.valueOf(cellData.getSubsidyAmt()));
Logger.d(sum);
}
Message msg = Message.obtain();
msg.arg1 = rownum;
msg.arg2 = (int) sum;
msg.what = Constants.MSG_GET_DATA_FROM_EXCEL_SUCCESS;
handler.sendMessage(msg);
// BigDecimal big = new BigDecimal(cellData.getNumericCellValue());//将科学计数法表示的数据转化为String类型
// Logger.d("\t" + String.valueOf(big));
}
}).start();
}
当传入Excel文件名后需要对当前文件是Excel 2003还是Excel 2007进行处理
/**
* @param filename
* @return
* @throws IOException
* @Title: getWeebWork
* @Description: TODO(根据传入的文件名获取工作簿对象(Workbook))
*/
public static Workbook getWeebWork(UsbFile filename) throws IOException {
Workbook workbook = null;
if (null != filename) {
String fileType = filename.getName().substring(filename.getName().lastIndexOf("."), filename.getName().length());
// FileInputStream fileStream = new FileInputStream(new File(filename));
if (".xls".equals(fileType.trim().toLowerCase())) {
// workbook = new HSSFWorkbook(new UsbFileInputStream(filename));
// or buffered (may increase performance)
// workbook = new HSSFWorkbook(UsbFileStreamFactory.createBufferedOutputStream(filename, currentFs));
// if you don't have the current fs this should be fine as well
workbook = new HSSFWorkbook(new BufferedInputStream(new UsbFileInputStream(filename)));
} else if (".xlsx".equals(fileType.trim().toLowerCase())) {
workbook = new XSSFWorkbook(new BufferedInputStream(new UsbFileInputStream(filename)));
}
}
return workbook;
}
通过Handler消息处理机制，将我们在子线程获取到的Excel文件在主线程进行处理
private class MyHandler extends Handler {
//对Activity的弱引用
private final WeakReference<SubsidyReleaseActivity> mActivity;
public MyHandler(SubsidyReleaseActivity activity) {
mActivity = new WeakReference<SubsidyReleaseActivity>(activity);
}
@Override
public void handleMessage(Message msg) {
SubsidyReleaseActivity activity = mActivity.get();
if (activity == null) {
super.handleMessage(msg);
return;
}
switch (msg.what) {
case Constants.MSG_GET_DATA_FROM_EXCEL_SUCCESS:
subsidyTotalAmt = msg.arg2;//总行数
subsidyTotalCount = msg.arg1;
dialog_wait.dismiss();
Logger.t("补助总笔数").d(subsidyTotalCount);
Logger.t("补助总金额").d(subsidyTotalAmt);
break;
}
}
}
最后我们在页面销毁时，注销广播，关闭USB设备
@Override
protected void onDestroy() {
super.onDestroy();
if (mUsbReceiver != null) {//有注册就有注销
unregisterReceiver(mUsbReceiver);
mUsbReceiver = null;
}
if (sb != null) {
sb.unsubscribe();
}
if (storageDevices != null) {
for (UsbMassStorageDevice device : storageDevices) {
device.close();
storageDevices = null;
}
}
}
Android 读取Assets 下的Excel文件
在我们做项目过程中，项目内测时，需要白名单控制，白名单实现的一种方案就是把用户的登录名电话号码作为白名单，如果不在白名单内则提示无法登录。此时，我们的白名单用户列表保存在Excel文件中，我们可以把Excel文件保存到Assets下进行读取。
首先需要把编辑好的Excel文件放到main目录下的assets下。（如果位置放错则读取不到）
然后通过子线程来读取Excel文件内容
public static void getWhiteList(final Context context, final Handler handler) {
new Thread(new Runnable() {
@Override
public void run() {
ArrayList<WhiteListInfo> whitesList = new ArrayList<WhiteListInfo>();
AssetManager assetManager = context.getAssets();
try {
InputStream fileStream = new BufferedInputStream(assetManager.open("whitelist.xls"));
Workbook workbook = Workbook.getWorkbook(fileStream);
Sheet sheet = workbook.getSheet(0);
int sheetNum = workbook.getNumberOfSheets();
int sheetRows = sheet.getRows();
int sheetColumns = sheet.getColumns();
Log.d(TAG, "the num of sheets is " + sheetNum);
Log.d(TAG, "the name of sheet is " + sheet.getName());
Log.d(TAG, "total rows is 行=" + sheetRows);
Log.d(TAG, "total cols is 列=" + sheetColumns);
for (int i = 0; i < sheetRows; i++) {
WhiteListInfo whitesListPhone = new WhiteListInfo();
whitesListPhone.setPhoneNo(sheet.getCell(0, i).getContents());
whitesList.add(whitesListPhone);
}
workbook.close();
} catch (Exception e) {
Log.e(TAG, "read error=" + e, e);
}
Message msg = Message.obtain();
msg.obj = whitesList;
msg.what = NetUrls.MSG_GET_WHITE_LIST_SUCC;
// 发送这个消息到消息队列中
handler.sendMessage(msg);
}
}).start();
}
这里我们提前知道了Excel文件里面的内容，我这里只有一个电话号码列，所以要定义好相应的实体类 WhiteListInfo，将我们读取到的所以电话号码保存到List集合当中。
在主线程获取到我们读取的内容
private void getWhiteListFromAsset() {
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
// 请求用户信息成功
if (msg.what == NetUrls.MSG_GET_WHITE_LIST_SUCC) {
boolean isWhite = false;
whitesList = (ArrayList<WhiteListInfo>) msg.obj;
for (WhiteListInfo whiteNo : whitesList) {
LogUtil.i("白名单", whiteNo.getPhoneNo());
if (whiteNo.getPhoneNo().equals(currentMobileNo)) {
isWhite = true;
}
}
dismissProgressDialog();
if (checkWhite && !isWhite) {
new AlertDialog.Builder(MainActivity.this)
.setTitle("提示")
.setMessage("您的账号未在测试白名单内！")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
})
.setCancelable(false)
.create()
.show();
return;
}
if (!isFirstRun) {
String preMobileNo = BankInfoUtils.getUserInfo(MainActivity.this).getMobileNo();
LogUtil.i("bankInfo:", currentMobileNo + ";" + preMobileNo);
if (!currentMobileNo.equals(preMobileNo)) {
Intent intent = new Intent(MainActivity.this, ChangeAccountActivity.class);
startActivity(intent);
finish();
return;
}
}
sharedPreferences.edit().putBoolean("isFirstRun", false).apply();
SharedPreferencesUtil.setPreferenceValue(MainActivity.this, "cipherText", cipherText);
initUI();
initData();
initView();
initEvent();
}
}
};
HttpUtil.getWhiteList(this, handler);
}
注意事项：在读取Excel文件时有可能会遇到下面的错误
jxl.read.biff.BiffException: Unable to recognize OLE stream
这是因为因为文件是Excel2007，而jxl解析07会报上述异常，也就是jxl可以处理Excel2003。只需要原文件另存为2003文 件即可
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作者：Eddy09
来源：CSDN
原文：https://blog.csdn.net/liminwu_6/article/details/72983810
版权声明：本文为博主原创文章，转载请附上博文链接！