我正在开发将SQlite作为数据库的android应用程序。我想以编程方式从DB导出某些结果到excel文件格式，想将excel存储到本地设备路径中，我遇到了以下链接
那么，为Android应用程序实现“导出到Excel”的确切过程是什么？
伙计们是我成功实施的答案
//new async task for file export to csv
private class ExportDatabaseCSVTask extends AsyncTask<String, String, Boolean> {
private final ProgressDialog dialog = new ProgressDialog(SearchResultActivity.this);
boolean memoryErr = false;
// to show Loading dialog box
@Override
protected void onPreExecute() {
this.dialog.setMessage("Exporting database...");
this.dialog.show();
}
// to write process
protected Boolean doInBackground(final String... args) {
boolean success = false;
String currentDateString = new SimpleDateFormat(Constants.SimpleDtFrmt_ddMMyyyy).format(new Date());
File dbFile = getDatabasePath("HLPL_FRETE.db");
Log.v(TAG, "Db path is: " + dbFile); // get the path of db
File exportDir = new File(Environment.getExternalStorageDirectory() + File.separator + Constants.FileNm.FILE_DIR_NM, "");
long freeBytesInternal = new File(getApplicationContext().getFilesDir().getAbsoluteFile().toString()).getFreeSpace();
long megAvailable = freeBytesInternal / 1048576;
if (megAvailable < 0.1) {
System.out.println("Please check"+megAvailable);
memoryErr = true;
}else {
exportDirStr = exportDir.toString();// to show in dialogbox
Log.v(TAG, "exportDir path::" + exportDir);
if (!exportDir.exists()) {
exportDir.mkdirs();
}
try {
List<SalesActivity> listdata = salesLst;
SalesActivity sa = null;
String lob = null;
for (int index = 0; index < listdata.size();) {
sa = listdata.get(index);
lob = sa.getLob();
break;
}
if (Constants.Common.OCEAN_LOB.equals(lob)) {
file = new File(exportDir, Constants.FileNm.FILE_OFS + currentDateString + ".csv");
} else {
file = new File(exportDir, Constants.FileNm.FILE_AFS + currentDateString + ".csv");
}
file.createNewFile();
CSVWriter csvWrite = new CSVWriter(new FileWriter(file));
// this is the Column of the table and same for Header of CSV
// file
if (Constants.Common.OCEAN_LOB.equals(lob)) {
csvWrite.writeNext(Constants.FileNm.CSV_O_HEADER);
}else{
csvWrite.writeNext(Constants.FileNm.CSV_A_HEADER);
}
String arrStr1[] = { "SR.No", "CUTSOMER NAME", "PROSPECT", "PORT OF LOAD", "PORT OF DISCHARGE" };
csvWrite.writeNext(arrStr1);
if (listdata.size() > 0) {
for (int index = 0; index < listdata.size(); index++) {
sa = listdata.get(index);
String pol;
String pod;
if (Constants.Common.OCEAN_LOB.equals(sa.getLob())) {
pol = sa.getPortOfLoadingOENm();
pod = sa.getPortOfDischargeOENm();
} else {
pol = sa.getAirportOfLoadNm();
pod = sa.getAirportOfDischargeNm();
}
int srNo = index;
String arrStr[] = { String.valueOf(srNo + 1), sa.getCustomerNm(), sa.getProspectNm(), pol, pod };
csvWrite.writeNext(arrStr);
}
success = true;
}
csvWrite.close();
} catch (IOException e) {
Log.e("SearchResultActivity", e.getMessage(), e);
return success;
}
}
return success;
}
// close dialog and give msg
protected void onPostExecute(Boolean success) {
if (this.dialog.isShowing()) {
this.dialog.dismiss();
}
if (success) {
dialogBox(Constants.Flag.FLAG_EXPRT_S);
} else {
if (memoryErr==true) {
dialogBox(Constants.Flag.FLAG_MEMORY_ERR);
} else {
dialogBox(Constants.Flag.FLAG_EXPRT_F);
}
}
}
}
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