获取以下包裹的错误：
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Cell;
可以帮我解决以下代码以解决错误。
public class AndroidReadExcelActivity extends Activity implements OnClickListener{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
View writeButton = findViewById(R.id.write);
writeButton.setOnClickListener(this);
View readButton = findViewById(R.id.read);
readButton.setOnClickListener(this);
View writeExcelButton = findViewById(R.id.writeExcel);
writeExcelButton.setOnClickListener(this);
View readExcelButton = findViewById(R.id.readExcel);
readExcelButton.setOnClickListener(this);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.write:
saveFile(this,"myFile.txt");
break;
case R.id.read:
readFile(this,"myFile.txt");
break;
case R.id.writeExcel:
saveExcelFile(this,"myExcel.xls");
break;
case R.id.readExcel:
readExcelFile(this,"myExcel.xls");
break;
}
}
private static boolean saveFile(Context context, String fileName) {
// check if available and not read only
if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {
Log.w("FileUtils", "Storage not available or read only");
return false;
}
// Create a path where we will place our List of objects on external storage
File file = new File(context.getExternalFilesDir(null), fileName);
PrintStream p = null; // declare a print stream object
boolean success = false;
try {
OutputStream os = new FileOutputStream(file);
// Connect print stream to the output stream
p = new PrintStream(os);
p.println("This is a TEST");
Log.w("FileUtils", "Writing file" + file);
success = true;
} catch (IOException e) {
Log.w("FileUtils", "Error writing " + file, e);
} catch (Exception e) {
Log.w("FileUtils", "Failed to save file", e);
} finally {
try {
if (null != p)
p.close();
} catch (Exception ex) {
}
}
return success;
}
private static void readFile(Context context, String filename) {
if (!isExternalStorageAvailable() || isExternalStorageReadOnly())
{
Log.w("FileUtils", "Storage not available or read only");
return;
}
FileInputStream fis = null;
try
{
File file = new File(context.getExternalFilesDir(null), filename);
fis = new FileInputStream(file);
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fis);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
//Read File Line By Line
while ((strLine = br.readLine()) != null) {
Log.w("FileUtils", "File data: " + strLine);
Toast.makeText(context, "File Data: " + strLine , Toast.LENGTH_SHORT).show();
}
in.close();
}
catch (Exception ex) {
Log.e("FileUtils", "failed to load file", ex);
}
finally {
try {if (null != fis) fis.close();} catch (IOException ex) {}
}
return;
}
private static boolean saveExcelFile(Context context, String fileName) {
// check if available and not read only
if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {
Log.w("FileUtils", "Storage not available or read only");
return false;
}
boolean success = false;
//New Workbook
Workbook wb = new HSSFWorkbook();
Cell c = null;
//Cell style for header row
CellStyle cs = wb.createCellStyle();
cs.setFillForegroundColor(HSSFColor.LIME.index);
cs.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
//New Sheet
Sheet sheet1 = null;
sheet1 = wb.createSheet("myOrder");
// Generate column headings
Row row = sheet1.createRow(0);
c = row.createCell(0);
c.setCellValue("Item Number");
c.setCellStyle(cs);
c = row.createCell(1);
c.setCellValue("Quantity");
c.setCellStyle(cs);
c = row.createCell(2);
c.setCellValue("Price");
c.setCellStyle(cs);
sheet1.setColumnWidth(0, (15 * 500));
sheet1.setColumnWidth(1, (15 * 500));
sheet1.setColumnWidth(2, (15 * 500));
// Create a path where we will place our List of objects on external storage
File file = new File(context.getExternalFilesDir(null), fileName);
FileOutputStream os = null;
try {
os = new FileOutputStream(file);
wb.write(os);
Log.w("FileUtils", "Writing file" + file);
success = true;
} catch (IOException e) {
Log.w("FileUtils", "Error writing " + file, e);
} catch (Exception e) {
Log.w("FileUtils", "Failed to save file", e);
} finally {
try {
if (null != os)
os.close();
} catch (Exception ex) {
}
}
return success;
}
private static void readExcelFile(Context context, String filename) {
if (!isExternalStorageAvailable() || isExternalStorageReadOnly())
{
Log.w("FileUtils", "Storage not available or read only");
return;
}
try{
// Creating Input Stream
File file = new File(context.getExternalFilesDir(null), filename);
FileInputStream myInput = new FileInputStream(file);
// Create a POIFSFileSystem object
POIFSFileSystem myFileSystem = new POIFSFileSystem(myInput);
// Create a workbook using the File System
HSSFWorkbook myWorkBook = new HSSFWorkbook(myFileSystem);
// Get the first sheet from workbook
HSSFSheet mySheet = myWorkBook.getSheetAt(0);
/** We now need something to iterate through the cells.**/
Iterator<Row> rowIter = mySheet.rowIterator();
while(rowIter.hasNext()){
HSSFRow myRow = (HSSFRow) rowIter.next();
Iterator<Cell> cellIter = myRow.cellIterator();
while(cellIter.hasNext()){
HSSFCell myCell = (HSSFCell) cellIter.next();
Log.w("FileUtils", "Cell Value: " + myCell.toString());
Toast.makeText(context, "cell Value: " + myCell.toString(), Toast.LENGTH_SHORT).show();
}
}
}catch (Exception e){e.printStackTrace(); }
return;
}
public static boolean isExternalStorageReadOnly() {
String extStorageState = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState)) {
return true;
}
return false;
}
public static boolean isExternalStorageAvailable() {
String extStorageState = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(extStorageState)) {
return true;
}
return false;
}
}