FileWriter f = new FileWriter("impossible.txt");
// throws: 'java.io.FileNotFoundException: /impossible.txt '

       try { // catches IOException below
               final String TESTSTRING = new String("Hello Android");
               
               // ##### Write a file to the disk #####
               /* We have to use the openFileOutput()-method
                * the ActivityContext provides, to
                * protect your file from others and
                * This is done for security-reasons.
                * We chose MODE_WORLD_READABLE, because
                *  we have nothing to hide in our file */        
               FileOutputStream fOut = openFileOutput("samplefile.txt",
                                        MODE_WORLD_READABLE);
               OutputStreamWriter osw = new OutputStreamWriter(fOut); 

               // Write the string to the file
               osw.write(TESTSTRING);
               /* ensure that everything is
                * really written out and close */
               osw.flush();
               osw.close();

               // ##### Read the file back in #####
               
               /* We have to use the openFileInput()-method
                * the ActivityContext provides.
                * Again for security reasons with
                * openFileInput(...) */
               FileInputStream fIn = openFileInput("samplefile.txt");
               InputStreamReader isr = new InputStreamReader(fIn);
               /* Prepare a char-Array that will
                * hold the chars we read back in. */
               char[] inputBuffer = new char[TESTSTRING.length()];
               // Fill the Buffer with data from the file
               isr.read(inputBuffer);
               // Transform the chars to a String
               String readString = new String(inputBuffer);
               
               // Check if we read back the same chars that we had written out
               boolean isTheSame = TESTSTRING.equals(readString);

               // WOHOO lets Celebrate =)
               Log.i("File Reading stuff", "success = " + isTheSame);

          } catch (IOException ioe) {
               ioe.printStackTrace();
          }

public boolean deleteFile(String name)
// Delete the given private file associated with this Context's application package.