我正在使用便攜式打印機打印收據。我對它不是很了解...這里是格式。如何將“Header 1”字體大小設置為比其他字體大，并將所有標題設置為中間？這是代碼SQLiteDatabase db = mSQLiteHelper.getReadableDatabase();            Cursor cursor = db.rawQuery("select * from Information", null);            while (cursor.moveToNext()) {                txn = new SettingModel();                String header1 = (cursor.getString(cursor.getColumnIndex("header1")));                String header2 = (cursor.getString(cursor.getColumnIndex("header2")));                String header3 = (cursor.getString(cursor.getColumnIndex("header3")));                String header4 = (cursor.getString(cursor.getColumnIndex("header4")));                String txnNo = "TxnNo: " + D_Txn.getText().toString();                String name = "Name: " + D_Name.getText().toString();                String amount = "Amount: " + D_Amount.getText().toString();                String Date = "Date: " + Select_Date.getText().toString();                String Users = (cursor.getString(cursor.getColumnIndex("personInCharge")));                String space = "";                header1 += "\n";                header2 += "\n";                header3 += "\n";                header4 += "\n";                txnNo += "\n";                name += "\n";                amount += "\n";                Date += "\n";                Users += "\n";                space += "\n";                Toast.makeText(this, "Printing Text...", Toast.LENGTH_SHORT).show();無論如何要放一個空格嗎？我使用的是空字符串，是否正確？