Android 除非另有说明，否则不要关闭对话框窗口？

在对话框窗口中，用户输入搜索关键字。然后数据库查找它并返回对象列表。若列表大小为0，我想通知用户未找到任何内容，并保持对话框窗口打开，直到用户能够输入正确的关键字，结果超过0，或者直到用户决定退出对话框窗口

如果在数据库中找不到任何结果，我就不知道如何保持窗口打开。如能提供帮助，将不胜感激：

    public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    final EditText input = new EditText(getActivity());
    input.setHint("Enter keyword");

    builder.setTitle("Search").setView(input)
            .setPositiveButton("DONE", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    newExams = database.searchList(input.getText().toString());
                    if (newExams.size() == 0) {
                        Toast.makeText(getActivity(), "Nothing!", Toast.LENGTH_LONG).show();
                        return;
// here, I would like to make sure that window will be opened for second attempt of inputting a keyword
                    }

                    ExamAdapter newAdapter = new ExamAdapter(getActivity(), newExams);
                    listViewExams.setAdapter(newAdapter);
                }
            })
            .setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    // Canceled.
                }
            });
    return builder.create();
}

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创建自定义对话框片段并覆盖按钮，我的旧代码中有一个工作示例：

public 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");
    final View view = getActivity().getLayoutInflater().inflate(
            R.layout.dialoglayout, null);

    return new AlertDialog.Builder(getActivity())
            // .setIcon(R.drawable.icon)
            .setTitle(title)
            .setView(view)
            .setPositiveButton(getActivity().getResources().getString(R.string.dialog_save),
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,
                                int whichButton) {
                            //do something
                            dismiss();

                        }
                    })
            .setNegativeButton(getActivity().getResources().getString(R.string.dialog_cancel),
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,
                                int whichButton) {
                            //do something
                        }
                    })
            .setNeutralButton(getActivity().getResources().getString(R.string.dialog_clear),
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,
                                int whichButton) {

                        }
                    }).create();
    }

    @Override
    public void onStart() {
        super.onStart(); // super.onStart() is where dialog.show() is actually
                     // called on the underlying dialog, so we have to do
                     // it after this point
        AlertDialog d = (AlertDialog) getDialog();
        if (d != null) {
            Button neutralButton = (Button) d.getButton(Dialog.BUTTON_NEUTRAL);
            // neutralButton.setBackgroundResource(R.drawable.xloginbutton);
            // neutralButton.setTextColor(Color.parseColor("#FFFFFF"));
            neutralButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Boolean wantToCloseDialog = false;
                // Do stuff, possibly set wantToCloseDialog to true then...
                if (wantToCloseDialog) {
                    dismiss();
                }

                // else dialog stays open. Make sure you have an obvious way
                // to close the dialog especially if you set cancellable to
                // false.
                }
            });

        }
    }
}

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builder.setCancelablefalse@克里斯安迪，我试过了。必须将生成器声明为final，并在if子句内调用值为false的setCancelable方法，在if子句外调用值为true的setCancelable方法。似乎没有帮助。另外@ChrisHandy-想指出，根据谷歌的文档，setCancelable方法只能确定用户是否能够用后退按钮关闭对话框。啊，我明白了，所以我必须重写onStart以修改肯定按钮。非常感谢。我会尽快尝试。