android apache poi错误
下面是我使用ApachePOI为数据库生成备份的代码,但在执行时显示了一些错误 我从HSSF工作表开始,创建一张工作表,从数据库中添加详细信息,并将该文件保存在sd卡上的特定位置android apache poi错误,android,apache-poi,hssfworkbook,Android,Apache Poi,Hssfworkbook,下面是我使用ApachePOI为数据库生成备份的代码,但在执行时显示了一些错误 我从HSSF工作表开始,创建一张工作表,从数据库中添加详细信息,并将该文件保存在sd卡上的特定位置 HSSFWorkbook backup=new HSSFWorkbook(); HSSFSheet sheet=backup.createSheet("Contact_Backup"); Map<String, Object[]> data = new HashMap<String, Obj
HSSFWorkbook backup=new HSSFWorkbook();
HSSFSheet sheet=backup.createSheet("Contact_Backup");
Map<String, Object[]> data = new HashMap<String, Object[]>();
sq = md.getReadableDatabase();
Cursor mCursor = sq.rawQuery("SELECT * FROM "
+ MyDatabase.TABLE_NAME, null);
if (mCursor.moveToFirst()) {
do {
idbackup.add(mCursor.getString(mCursor.getColumnIndex(MyDatabase.KEY_ID)));
namebackup.add(mCursor.getString(mCursor.getColumnIndex(MyDatabase.KEY_NAME)));
numberbackup.add(mCursor.getString(mCursor.getColumnIndex(MyDatabase.KEY_NUM)));
addressbackup.add(mCursor.getString(mCursor.getColumnIndex(MyDatabase.KEY_ADDR)));
mailbackup.add(mCursor.getString(mCursor.getColumnIndex(MyDatabase.KEY_MAIL)));
} while (mCursor.moveToNext());
}
if (idbackup.size() != 0) {
int j = 2;
for (int i = 0; i < idbackup.size(); i++) {
data.put(String.valueOf(j), new Object[]{idbackup.get(i), namebackup.get(i), numberbackup.get(i), addressbackup.get(i), mailbackup.get(i)});
j++;
}
}
Set<String> keyset = data.keySet();
int rownum = 0;
for (String key : keyset) {
Row row = sheet.createRow(rownum++);
Object[] objArr = data.get(key);
int cellnum = 0;
for (Object obj : objArr) {
Cell cell = row.createCell(cellnum++);
if (obj instanceof Date)
cell.setCellValue((Date) obj);
else if (obj instanceof Boolean)
cell.setCellValue((Boolean) obj);
else if (obj instanceof String)
cell.setCellValue((String) obj);
else if (obj instanceof Double)
cell.setCellValue((Double) obj);
}
}
try {
File directory = new File("/sdcard/BulkMessenger/backups"); /*creating the file directory
directory.mkdir();
long date = System.currentTimeMillis();
SimpleDateFormat sdf = new SimpleDateFormat("MMM MM dd, yyyy h:mm a");
String dateString = sdf.format(date);
File file = new File(directory, dateString+"backupcontact.xls");
FileOutputStream out = new FileOutputStream(file);
backup.write(out);
out.close();
Toast.makeText(getApplicationContext(),"Successfully backup generated in backup",Toast.LENGTH_LONG).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
提前谢谢你的帮助 它与引发异常的我的文件目录相关!!谢谢你的建议伙计们你启用了吗proguard@MaheshwarLigadebuildTypes{release{minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'),'proguard rules.pro'}您遇到了一个问题,Apache POI使用java.awt中的类计算字体大小,但是,这些类在Android上不可用。你能发布完整的stacktrace吗?这样我们就可以看到这个调用是在什么地方完成的了?@centic:上面提到的是我从PrintStackTrace获得的唯一日志,可能是
07-08 09:52:38.250 15615-15615/com.example.web03.bulkmessenger E/dalvikvm: Could not find class 'java.awt.font.FontRenderContext', referenced from method org.apache.poi.hssf.usermodel.HSSFSheet.autoSizeColumn