如何将自定义数据保存到文本文件？

Question

我正在开发一个对我自己的业务有帮助的应用程序（计费应用程序），我需要将数据存储在设备中。我需要特别保存到文本文件，但我不知道我必须做什么。我必须保存的数据类型：

(mydata.txt)

##

id:1

heatUsage:2123

waterUsage:45,4

##

id:2

heatUsage:4572

waterUsage:21,2

##

id:3

heatUsage:456

waterUsage:11,4

##

谁能知道如何以编程方式保存此文件？

Answer 1

希望这可能对你有用。您可以格式化数据，例如：&nbsp; &nbsp; public String formatData(List<User> users) {&nbsp; &nbsp; &nbsp; &nbsp; StringBuilder stringBuilder = new StringBuilder();&nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0; i < users.size(); i++) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; stringBuilder.append("##\n");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; stringBuilder.append("id:" + user.getId() + "\n");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; stringBuilder.append("heatUsage:" + user.getHeatUsage() + "\n");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; stringBuilder.append("waterUsage:" + user.getWaterUsage() + "\n");&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; return stringBuilder.toString();&nbsp; &nbsp; }并写入文件：private void writeToFile(String data,Context context) {&nbsp; &nbsp; try {&nbsp; &nbsp; &nbsp; &nbsp; OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput("filename.txt", Context.MODE_PRIVATE));&nbsp; &nbsp; &nbsp; &nbsp; outputStreamWriter.write(data);&nbsp; &nbsp; &nbsp; &nbsp; outputStreamWriter.close();&nbsp; &nbsp; }&nbsp; &nbsp; catch (IOException e) {&nbsp; &nbsp; &nbsp; &nbsp; Log.e("Exception", "File write failed: " + e.toString());&nbsp; &nbsp; }&nbsp;}