如何在Android中编写SimpleDateFormat fo文件

发布于 2024-12-05 09:58:34 字数 512 浏览 1 评论 0原文

我是安迪世界的新人。我正在做我的第一个应用程序。 GPS追踪器。我需要将坐标+（时间，日期）保存到 SD 上的文件中。

坐标很容易，但时间和坐标是很容易的。日期（在 SimpleDateFormat 中）给我带来了麻烦。

write() 方法在 SDF 方面存在问题。我尝试过转换为字符串和许多其他东西。

官方错误信息是： “FileOutputStream 类型中的 write(byte[]) 方法不适用于参数 (String)”

  FileOutputStream fos = openFileOutput("kris.txt", Context.MODE_PRIVATE);
    SimpleDateFormat sdf = new SimpleDateFormat( "yyyy/MM/dd' 'HH:mm:ss " ); 
    String k = sdf.toString();
    fos.write(k);
    fos.flush();
    fos.close();

原文

I'm new in Andy world. I'm doing mine first app. GPS tracker.
I need to save coordinates + (time ,date) to file on SD.

Coordinates are easy, but Time & Date ( in SimpleDateFormat) make me a trouble.

write() method has problem with SDF. I've tried convert to string and many other things.

official error message is:
"The method write(byte[]) in the type FileOutputStream is not applicable for the arguments (String)"

  FileOutputStream fos = openFileOutput("kris.txt", Context.MODE_PRIVATE);
    SimpleDateFormat sdf = new SimpleDateFormat( "yyyy/MM/dd' 'HH:mm:ss " ); 
    String k = sdf.toString();
    fos.write(k);
    fos.flush();
    fos.close();

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眼眸里的那抹悲凉 2024-12-12 09:58:34

据我了解，你只需要改变方法。要将字符串写入文件，您需要使用 BufferedWrite 或 PrintWriter。

试试这个：（

public void writeLinesToFile(String filename,
                               String[] linesToWrite,
                               boolean appendToFile) {
    PrintWriter pw = null;
    try {
      if (appendToFile) {
        //If the file already exists, start writing at the end of it.
        pw = new PrintWriter(new FileWriter(filename, true));
      }
      else {
        pw = new PrintWriter(new FileWriter(filename));
      }
      for (int i = 0; i < linesToWrite.length; i++) {
        pw.println(linesToWrite[i]);
      }
      pw.flush();
    }
    catch (IOException e) {
      e.printStackTrace();
    }
    finally {
      //Close the PrintWriter
      if (pw != null)
        pw.close();
    }
  }

来自java手册的代码）

As I understood you just need to change the method. To write strings to a file you need to use BufferedWrite or PrintWriter.

Try this:

public void writeLinesToFile(String filename,
                               String[] linesToWrite,
                               boolean appendToFile) {
    PrintWriter pw = null;
    try {
      if (appendToFile) {
        //If the file already exists, start writing at the end of it.
        pw = new PrintWriter(new FileWriter(filename, true));
      }
      else {
        pw = new PrintWriter(new FileWriter(filename));
      }
      for (int i = 0; i < linesToWrite.length; i++) {
        pw.println(linesToWrite[i]);
      }
      pw.flush();
    }
    catch (IOException e) {
      e.printStackTrace();
    }
    finally {
      //Close the PrintWriter
      if (pw != null)
        pw.close();
    }
  }

(code from a java manual)

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