java - 无法设置EditText？从 fragment 中的对话框发出问题 - 奇怪 - Android Java

Question

我遇到了一个以前从未遇到过的问题。我有一个包含按钮的 Fragment 。此按钮 (ViewBookingButton) 显示一个弹出对话框。当对话框打开时，我想在 EditText (AllBooking) 中设置一个字符串。不幸的是，它崩溃并显示 NullPointerExecption。出了什么问题？这是我的代码:

ViewBookingButton.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v)
    {

        AlertDialog.Builder ViewBookingHelpBuilder = new AlertDialog.Builder(getActivity());
        ViewBookingHelpBuilder.setTitle("view booking:");

        LayoutInflater inflater = getActivity().getLayoutInflater();
        View DialogLayout = inflater.inflate(R.layout.view_booking, null);
        ViewBookingHelpBuilder.setView(DialogLayout);

        TextView AllBooking = (TextView)view.findViewById(R.id.AllBooking);

        AllBooking.setText("Hello World");//WHEN I REMOVE THIS THE DIALOG WORKS


        ViewBookingHelpBuilder.setPositiveButton("Done", new DialogInterface.OnClickListener() {

         @Override   
             public void onClick(DialogInterface dialog, int which)
             {                   
             }
        });


        AlertDialog helpDialog = ViewBookingHelpBuilder.create();
        helpDialog.show();

            }

    });

Answer 1

改变这个

 TextView AllBooking = (TextView)view.findViewById(R.id.AllBooking);

至

 TextView AllBooking = (TextView)DialogLayout.findViewById(R.id.AllBooking);

TextView 属于膨胀布局，“findViewById”在当前 View 层次结构中查找 View 。