File dbFile = getDatabasePath("water.db"); // dbfile
				File exportDir = new File(Environment
						.getExternalStorageDirectory(), "");
				if (!exportDir.exists()) {
					exportDir.mkdirs();
				}

				File file = new File(exportDir, "database_export.csv");
				try {
					file.createNewFile();
					CSVWriter csvWrite = new CSVWriter(new FileWriter(file));
					Cursor curCSV = db
							.rawQuery("SELECT * FROM waterdata", null); // query
					csvWrite.writeNext(curCSV.getColumnNames());
					while (curCSV.moveToNext()) {
						// Which column you want to exprort
						String arrStr[] = { curCSV.getString(0),
								curCSV.getString(1), curCSV.getString(2),
								curCSV.getString(3) };
						csvWrite.writeNext(arrStr);
					}
					csvWrite.close();
					curCSV.close();
					Toast msg = Toast.makeText(MainActivity.this,
							"File was stored in SDCARD", Toast.LENGTH_LONG);
					msg.show();
				} catch (Exception sqlEx) {
					Toast msg = Toast.makeText(MainActivity.this, "Failed",
							Toast.LENGTH_LONG);
					msg.show();
				}