CODEWITHSUNDEEP
androidlistviewenumsandroid-alertdialog
user1583209
user1583209

Reputation: 1717

AlertDialog Builder setSingleChoiceItems from enum

I have a simple AlertDialog with a setSingleChoiceItems list of two elements which works fine.

final CharSequence[] blackwhite = {"White", "Black"};

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);


    alertDialogBuilder.setTitle("Title");
    alertDialogBuilder
            .setCancelable(false)
            .setSingleChoiceItems(blackwhite, -1,null)
            .setPositiveButton("Start", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    ListView lw = ((AlertDialog) dialog).getListView();
                    Object checkedItem = lw.getAdapter().getItem(lw.getCheckedItemPosition());

                     // Do something with checkedItem
                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            });

    AlertDialog alertDialog = alertDialogBuilder.create();
    alertDialog.show();

In the rest of the code, these two items actually correspond to an enum:

public enum Player {
    WHITE, BLACK
}

Is there an elegant way of using the enum directly in setSingleChoiceItems without manually converting to String/CharSequence? For instance if I later decide to change "WHITE" to "GREEN" in the enum only, this should automatically show up in the alert dialog as well.

Upvotes: 5

Views: 2364

Answers (1)

optimusfrenk
optimusfrenk

Reputation: 1321

You can obtain the String value of a Player using the toString() method.

Player.WHITE.toString(); // returns "WHITE"

You could do something like:

public enum Player {

  WHITE, BLACK, GREEN, PURPLE

  public static String[] getValues() {
    String[] strs = new String[Player.values().length];
    int i = 0;

    for (Player p: all)
      strs[i++] = p.toString().toLowerCase();

    return strs; // ["white", "black", "green", "purple"]
  }
}

I hope it helps!

Upvotes: 7

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