How to play sound using path data from SQLite Database

You will want to use the built in constants for getting access to the users SD Card.

You can get the path for this from the following call:

Environment.getExternalStorageDirectory().getAbsolutePath()

Don't forget to add the following permission though to your manifest:

<manifest ...>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest>

So putting all together you can do something similar to this for saving the file:

String myAppDir = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + 'raw';
String fileName = "myFile.wav";

String filePath = myAppDir + File.separator + fileName;

File f = new File(filePath);
f.write(...);
f.flush();
f.close();

Then to pass the file to a built in player you can make and call an Intent as follows:

File file = new File(filePath);
Intent i = new Intent(Intent.ACTION_VIEW);
i.setDataAndType(Uri.fromFile(file), "audio/*");
startActivity(i);

Let me know if you have any questions and I can expand the answer a bit more.

Updates:

The above is to save a file and then play that file using an inbuilt media player.

If the file is already on the SD card and you want to programmatically play the file you can use the following code:

mpintro = MediaPlayer.create(this, Uri.parse(Environment.getExternalStorageDirectory().getPath()+ "/raw/intro.mp3"));
mpintro.setLooping(true);
        mpintro.start();