android 输出.txt 文本换行问题

// 获取当前日期和时间
                Calendar cal = Calendar.getInstance();
                String fileName = cal.get(Calendar.YEAR) + "_" + cal.get(Calendar.MONTH) + "_"
                        + cal.get(Calendar.DAY_OF_MONTH) + ".txt";
                FileWriter fileWriter = new FileWriter(new File(filePath + "/" + fileName), true);

                String log = "restart at: " + cal.get(Calendar.HOUR_OF_DAY) + ":"
                        + cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND);

                BufferedWriter bufferWriter = new BufferedWriter(fileWriter);
                // attention 换行需要以下两个一起才会在.txt文件中生效
                bufferWriter.write(log + "\r\n");
                bufferWriter.newLine();

                bufferWriter.close();
                fileWriter.close();

如代码 在输出字符串到.txt文件的时候 换行需要"\r\n"和 newLine() 一起用才有换行效果

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