How to change the value of an audio file's Pitch

Question

I'm developing an app in Android to change the all recorded audio files by men voice to the women voice.

I found a solution to change the Pitch value of an audio file by PlaybackParams in MediaPlayer. Here's my code for changing Pitch value:

mediaPlayer =new MediaPlayer();
    mediaPlayer.setDataSource(ur);
    mediaPlayer.prepare();
    PlaybackParams params = null;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
        params = new PlaybackParams();
        try {
            params.setPitch(Float.parseFloat(1.6f));
        }catch (Exception e){
            params.setPitch(1.6f)
        }
        mediaPlayer.setPlaybackParams(params);
    }

It works well, but the problem is that it works only on Android above version 5. Does anyone know another solution for that?