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Quite a few people have been asking how to save a file to the SD card in order to register it as a ringtone. The following example creates a function that will save a resource to the SD card (ie: from R.raw.soundfile to /sdcard/media/audio/ringtones/soundfile.wav) and register it as a ringtone.

I have split this example into two parts, the first part goes through the code a section at a time with a brief explanation of what it does, the second half is just the code that you can copy and paste and then edit to your hearts content.

Parts

We first setup our function to return a boolean depicting if we have failed or if we are successful. We accept in an integer which corresponds to the raw sound file.

public boolean saveas(int ressound){

}

So this function would be called in the following fashion:

saveas(R.raw.soundfile);

or utilising its boolean return:

if (saveas(R.raw.soundfile)){
// Code if successful
}
else
{
// Code if unsuccessful
}

The following chunk of code creates an inputstream from the raw sound resource and loads it into a buffer. We add in the mandatory try/catch clause around these operations and return false if an exception is raised (to indicate failure to the rest of our program and to prevent trying to continue act upon this sound).

 byte[] buffer=null;
 InputStream fIn = getBaseContext().getResources().openRawResource(ressound);
 int size=0;

 try {
  size = fIn.available();
  buffer = new byte[size];
  fIn.read(buffer);
  fIn.close();
 } catch (IOException e) {
  // TODO Auto-generated catch block
  return false;
 }

The following saves the buffer to a file on the SD card. It first ensures the folder exists and if not it is created. Then as before the writing operations are surrounded with try/catches

 String path="/sdcard/media/audio/ringtones/";
 String filename="examplefile"+".wav";

 boolean exists = (new File(path)).exists();
 if (!exists){new File(path).mkdirs();}

 FileOutputStream save;
 try {
  save = new FileOutputStream(path+filename);
  save.write(buffer);
  save.flush();
  save.close();
 } catch (FileNotFoundException e) {
  // TODO Auto-generated catch block
  return false;
 } catch (IOException e) {
  // TODO Auto-generated catch block
  return false;
 }

The following code sends an intent to tell the Media Scanner that we have added a new file, and sets up its properties in the media database:

 sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://"+path+filename)));

 File k = new File(path, filename);

 ContentValues values = new ContentValues();
 values.put(MediaStore.MediaColumns.DATA, k.getAbsolutePath());
 values.put(MediaStore.MediaColumns.TITLE, "exampletitle");
 values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/wav");
 values.put(MediaStore.Audio.Media.ARTIST, "cssounds ");
 values.put(MediaStore.Audio.Media.IS_RINGTONE, true);
 values.put(MediaStore.Audio.Media.IS_NOTIFICATION, true);
 values.put(MediaStore.Audio.Media.IS_ALARM, true);
 values.put(MediaStore.Audio.Media.IS_MUSIC, false);

 //Insert it into the database
 this.getContentResolver().insert(MediaStore.Audio.Media.getContentUriForPath(k.getAbsolutePath()), values);

Final code
Putting all this code together gives us our final functions:

public boolean saveas(int ressound){
 byte[] buffer=null;
 InputStream fIn = getBaseContext().getResources().openRawResource(ressound);
 int size=0;

 try {
  size = fIn.available();
  buffer = new byte[size];
  fIn.read(buffer);
  fIn.close();
 } catch (IOException e) {
  // TODO Auto-generated catch block
  return false;
 }

 String path="/sdcard/media/audio/ringtones/";
 String filename="examplefile"+".wav";

 boolean exists = (new File(path)).exists();
 if (!exists){new File(path).mkdirs();}

 FileOutputStream save;
 try {
  save = new FileOutputStream(path+filename);
  save.write(buffer);
  save.flush();
  save.close();
 } catch (FileNotFoundException e) {
  // TODO Auto-generated catch block
  return false;
 } catch (IOException e) {
  // TODO Auto-generated catch block
  return false;
 }    

 sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://"+path+filename)));

 File k = new File(path, filename);

 ContentValues values = new ContentValues();
 values.put(MediaStore.MediaColumns.DATA, k.getAbsolutePath());
 values.put(MediaStore.MediaColumns.TITLE, "exampletitle");
 values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/wav");
 values.put(MediaStore.Audio.Media.ARTIST, "cssounds ");
 values.put(MediaStore.Audio.Media.IS_RINGTONE, true);
 values.put(MediaStore.Audio.Media.IS_NOTIFICATION, true);
 values.put(MediaStore.Audio.Media.IS_ALARM, true);
 values.put(MediaStore.Audio.Media.IS_MUSIC, false);

 //Insert it into the database
 this.getContentResolver().insert(MediaStore.Audio.Media.getContentUriForPath(k.getAbsolutePath()), values);

 return true;
}

Comments, suggestions etc. are always welcome. Hope this has been helpful.