从内部存储读取和写入

Question

I am having this exception when trying to read from the file

java.io.FileNotFoundException: /data/data/.../files

I used this method because it can handle Unicode text while reading from the file

public void save(String string )
{

String filename = "main";


FileOutputStream outputStream;

try {
  outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
  outputStream.write(string.getBytes());
  outputStream.close();
} catch (Exception e) {
  e.printStackTrace();
}
}
public String read()
{
    try
    {

        Reader readerUnicode =
                new InputStreamReader(new FileInputStream(getFilesDir()), Charset.forName("UTF-16"));
                int e = 0;
                String f="";
                while ((e = readerUnicode.read()) != -1) {
                // cast to char. The casting removes the left most bit.
                 f = f+Character.toString((char) e);
                System.out.print(f);
                }

                return f;
    }
    catch(Exception e)
    {

        return e+"";
    }

}

how can I retrieve the internal save path

thanks

Answer 1

You are using getFilesDir() But not setting the actual file name. Just the directory path.

Try adding the file name in. Plus, you should probably add an extension like .txt to both the save and load path.

 new InputStreamReader(new FileInputStream(getFilesDir() + "/" + filename ), Charset.forName("UTF-16"));

and change filename to something more sensible.

String filename = "main.txt";

You could/should also check the file exists before accessing it. (Although you do try catch anyway)

File file = new File(getFilesDir() + "/" + filename);
if(!file.exists()) 
   return "";