如何设置可以输入的最大字符数。因此，现在用户可以在alertdialog中输入大量内容，而它应该具有最大值。这与xml不同。这会更容易，这个警报对话框有什么提示吗？

private void RequestNewGroup()
{
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AlertDialog);
    builder.setTitle("Enter Group Name ");

    final EditText groupNameField = new EditText(MainActivity.this);
    groupNameField.setHint("");
    builder.setView(groupNameField);

    builder.setPositiveButton("Create", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i)
        {
            String groupName = groupNameField.getText().toString();

            if (TextUtils.isEmpty(groupName))
            {
                Toast.makeText(MainActivity.this, "Please write Group Name...", Toast.LENGTH_SHORT).show();
            }
            else
            {
                CreateNewGroup(groupName);
            }
        }
    });

    builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i)
        {
            dialogInterface.cancel();
        }
    });

    builder.show();
}