Android读写文件

   public String ReadSettings(Context context)
    {
        FileInputStream fIn = null;
        InputStreamReader isr = null;
       
        char[] inputBuffer = new char[255];
        String data = null;
       
        try{
         fIn = openFileInput("settings.dat");      
            isr = new InputStreamReader(fIn);
            isr.read(inputBuffer);
            data = new String(inputBuffer);
            Toast.makeText(context, "Settings read",Toast.LENGTH_SHORT).show();
            }
            catch (Exception e) {      
            e.printStackTrace();
            Toast.makeText(context, "Settings not read",Toast.LENGTH_SHORT).show();
            }
            finally {
               try {
                      isr.close();
                      fIn.close();
                      } catch (IOException e) {
                      e.printStackTrace();
                      }
            }
            return data;
    }

    public void WriteSettings(Context context, String data)
    {
        FileOutputStream fOut = null;
        OutputStreamWriter osw = null;
        try{
            fOut = openFileOutput("settings.dat",MODE_PRIVATE);      
            osw = new OutputStreamWriter(fOut);
            osw.write(data);
            osw.flush();
            Toast.makeText(context, "Settings saved",Toast.LENGTH_SHORT).show();
            }
            catch (Exception e) {      
            e.printStackTrace();
            Toast.makeText(context, "Settings not saved",Toast.LENGTH_SHORT).show();
            }
            finally {
               try {
                      osw.close();
                      fOut.close();
                      } catch (IOException e) {
                      e.printStackTrace();
                      }
            }
    }