Android:禁用 DialogFragment 确定/取消按钮

Question

当使用 AlertDialog 创建 DialogFragment 时，如何禁用它的确定/取消按钮？我尝试调用 myAlertDialogFragment.getDialog() 但它总是返回 null，即使在显示 fragment 后也是如此

public static class MyAlertDialogFragment extends DialogFragment {

    public static MyAlertDialogFragment newInstance(int title) {
        MyAlertDialogFragment frag = new MyAlertDialogFragment();
        Bundle args = new Bundle();
        args.putInt("title", title);
        frag.setArguments(args);
        return frag;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        int title = getArguments().getInt("title");

        return new AlertDialog.Builder(getActivity())
                .setIcon(R.drawable.alert_dialog_icon)
                .setTitle(title)
                .setPositiveButton(R.string.alert_dialog_ok,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                            ((FragmentAlertDialog)getActivity()).doPositiveClick();
                        }
                    }
                )
                .setNegativeButton(R.string.alert_dialog_cancel,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                            ((FragmentAlertDialog)getActivity()).doNegativeClick();
                        }
                    }
                )
                .create();
    }
}

我知道我可以通过膨胀包含取消和确定按钮的布局来实现它，但如果可能的话我宁愿使用 AlertDialog 解决方案

Answer 1

您需要覆盖 DialogFragment 中的 onStart() 并保留对按钮的引用。然后您可以使用该引用稍后重新启用该按钮:

Button positiveButton;

@Override
public void onStart() {
    super.onStart();
    AlertDialog d = (AlertDialog) getDialog();
    if (d != null) {
        positiveButton = d.getButton(Dialog.BUTTON_POSITIVE);
        positiveButton.setEnabled(false);
    }

}