如何将自定义数据保存到文本文件?
How can I save my custom data to a text file?
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。
我要保存的数据类型:
(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?
希望这对您有用。
您可以像这样格式化数据:
public String formatData(List<User> users) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < users.size(); i++) {
stringBuilder.append("##\n");
stringBuilder.append("id:" + user.getId() + "\n");
stringBuilder.append("heatUsage:" + user.getHeatUsage() + "\n");
stringBuilder.append("waterUsage:" + user.getWaterUsage() + "\n");
}
return stringBuilder.toString();
}
并写入文件:
private void writeToFile(String data,Context context) {
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput("filename.txt", Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
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。 我要保存的数据类型:
(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?
希望这对您有用。 您可以像这样格式化数据:
public String formatData(List<User> users) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < users.size(); i++) {
stringBuilder.append("##\n");
stringBuilder.append("id:" + user.getId() + "\n");
stringBuilder.append("heatUsage:" + user.getHeatUsage() + "\n");
stringBuilder.append("waterUsage:" + user.getWaterUsage() + "\n");
}
return stringBuilder.toString();
}
并写入文件:
private void writeToFile(String data,Context context) {
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput("filename.txt", Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}