private Uri[] roomPhotos;
private Uri[] roomAudios;

roomPhotos=new Uri[n_rooms];
roomAudios=new Uri[n_rooms];

Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(Intent.createChooser(i, "Select photo"), IMAGE_LOADED);
Intent g = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(Intent.createChooser(g, "Select audio"), AUDIO_LOADED);

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == IMAGE_LOADED && resultCode == RESULT_OK && null != data) {
        roomPhotos[tempId]=data.getData();
        Log.d("aftroomadd","inserted: "+roomPhotos[tempId]);
        Log.d("aftroomadd","id: "+String.valueOf(tempId));
    }
    else if(requestCode == AUDIO_LOADED && resultCode == RESULT_OK && null != data) {
        roomAudios[tempId]=data.getData();
        Log.d("aftroomadd","id: "+String.valueOf(tempId));
        Log.d("aftroomadd","inserted: "+roomAudios[tempId]);
    }
}

04-27 10:25:29.567 14791-14791/? D/aftroomadd: inserted: content://media/external/audio/media/25831
04-27 10:25:29.567 14791-14791/? D/aftroomadd: id: 0
04-27 10:25:29.592 14791-14791/? D/aftroomadd: inserted: content://media/external/images/media/16365
04-27 10:25:29.592 14791-14791/? D/aftroomadd: id: 0

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if(id==R.id.accept) {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
        SharedPreferences.Editor edit = prefs.edit();
        File f;
        for(int z=0;z<roomTitles.length;z++){
            Log.d("aftroomadd","t: "+roomTitles[z]);
            Log.d("aftroomadd","p: "+roomPhotos[z]);
            Log.d("aftroomadd","a: "+roomAudios[z])
        }
        for(int i=0;i<roomPhotos.length;i++){
            try {
                f = new File(roomPhotos[i].getPath());
                partJson.put("title", roomTitles[i]);
                partJson.put("image", f.getName());
                f = new File(roomAudios[i].getPath());
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                [...]

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getPath()' on a null object reference

04-27 10:27:11.909 16307-16307/tzz.guidapp D/aftroomadd: t: ff
04-27 10:27:11.909 16307-16307/tzz.guidapp D/aftroomadd: p: content://media/external/images/media/16365
04-27 10:27:11.909 16307-16307/tzz.guidapp D/aftroomadd: a: null
04-27 10:27:11.909 16307-16307/tzz.guidapp D/aftroomadd: t: ttk
04-27 10:27:11.909 16307-16307/tzz.guidapp D/aftroomadd: p: content://media/external/images/media/16366
04-27 10:27:11.909 16307-16307/tzz.guidapp D/aftroomadd: a: null