Android EditText in AlertDialog seems too wide

It seems like the EditText in the image below is too wide. I assume that I have misused the SDK in some way and until convinced otherwise I am not looking for a way to specify some number of margin/padding pixels on the sides of the EditText.

This one looks more appropriate.

Here's my code (that creates the first, 'Create Tag', dialog):

final Dao<Tag, Integer> tagDao = getHelper().getTagDao();

final EditText input = new EditText(this);
input.setSingleLine(true);
input.setHint(R.string.create_tag_dialog_hint);

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(input);
builder.setTitle(getString(R.string.create_tag_dialog_title));
builder.setPositiveButton(
    getString(R.string.create_tag_dialog_positive),
    new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            String value = input.getText().toString().trim();
            Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show();
            Tag tag = new Tag(value);
            try {
                    tagDao.create(tag);
            } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
            }
        }
    });
builder.setNegativeButton(
    getString(R.string.create_tag_dialog_negative), null);
builder.show();

Sorry for the length of the post and thanks for any helpful comments.