在外部存储android文件中编写虚拟内容

问题描述

在下面提到的代码中，我在一个名为testfile.txt的文件中写入虚拟内容。但我想在外部存储的任何文件中写入虚拟内容。我不希望文件名是硬编码的。我该怎么办？

In the below mentioned code I am writing dummy contents in a file called "testfile.txt". But I want to write dummy contents in any of the files of the external storage. I don't want the file name to be hard coded. How do I do?

String root = android.os.Environment.getExternalStorageDirectory().getPath();
File myFile = new File(root,"testfile.txt");

FileChannel rwChannel = new RandomAccessFile(myFile, "rw").getChannel();
int numBytes = (int)rwChannel.size();
ByteBuffer buffer = rwChannel.map(FileChannel.MapMode.READ_WRITE, 0, numBytes);
System.out.println("buffer"+buffer);
byte[] randomBytes = new byte[numBytes];
new Random().nextBytes(randomBytes);
buffer.put(randomBytes);
rwChannel.write(buffer);
rwChannel.close();

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