Question

I am new to android. I have created SharedPreferences to store a playlist name and song names in the playlist. Now I have to rename the playlist.

And another is: How do I delete the SharedPreferences file (i.e PlaylistName.xml), when I delete the playlist?

Answer 1

At last, I am able to rename the sharedpreference file.

For reference, in my context the code is:

String fileName=etlistName.getText().toString();
File f=new File("/data/data/eywa.musicplayer/shared_prefs/"+PlayListName+".xml");
f.renameTo(new File("/data/data/eywa.musicplayer/shared_prefs/"+fileName+".xml"));

SharedPreferences mySharedPreferences=getSharedPreferences("list_of_playlist",Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = mySharedPreferences.edit();
editor.remove(PlayListName);
editor.putString(fileName, fileName);
editor.commit();
PlayListName=fileName;

And for deleting playlistName.xml:

for (int i=0; i<selectedItems.size();i++)
{//remove the songs names from the playlist
    SharedPreferences sp=getSharedPreferences(selectedItems.get(i),Activity.MODE_PRIVATE);
    SharedPreferences.Editor ed=sp.edit();
    ed.clear();
    ed.commit();
    //remove the play list name from the list_of_playlist
    SharedPreferences.Editor editor = mainPref.edit();
    editor.remove(selectedItems.get(i));
    //delete .xml file
    File f=new File("/data/data/eywa.musicplayer/shared_prefs/"+selectedItems.get(i)+".xml");
    if(f.delete())
        System.out.println("file deleted")
    editor.commit();
}
selectedItems.clear();