.dismiss（）在AlertDialog中显示错误

Question

I have the following code:

            AlertDialog.Builder b = new AlertDialog.Builder(getActivity());
            View view = LayoutInflater.from(getActivity()).inflate(R.layout.displayfilecontents, null);
            EditText text = (EditText) view.findViewById(R.id.etFileContents);
            if (text != null) {
                text.setFocusable(false);
                text.setLongClickable(false);
                text.setTextIsSelectable(false);
            }
            text.setText(builder);
            b.setView(view);
            b.setTitle("Trip Name: " + FilesInFolder.get(position).toString().substring(0, FilesInFolder.get(position).toString().lastIndexOf(".")));
            Button btnCloseIt = (Button) view.findViewById(R.id.btnClose);
            btnCloseIt.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    b.dismiss();
                }
            });
            AlertDialog dl = b.create();
            dl.show();

I am trying to dismiss the dialog once the btnCloseIt is pressed. I am receiving an error on this line:

b.dismiss(); //giving an error

Error: The method dismiss() is undefined for the type AlertDialog.Builder

Update : [ RESOLVED ]

        // custom dialog
        final Dialog dialog = new Dialog(getActivity());
        dialog.setContentView(R.layout.displayfilecontents);
        dialog.setTitle("Trip Name: " + FilesInFolder.get(position).toString().substring(0, FilesInFolder.get(position).toString().lastIndexOf(".")));

        EditText text = (EditText) dialog.findViewById(R.id.etFileContents);
        if (text != null) {
            text.setFocusable(false);
            text.setLongClickable(false);
            text.setTextIsSelectable(false);
        }
        text.setText(builder);
        Button btnCloseIt = (Button) dialog.findViewById(R.id.btnClose);
        // if button is clicked, close the custom dialog
        btnCloseIt.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                dialog.dismiss();
            }
        });
        dialog.show();

Answer 1

As others have already pointed out, b is a reference to AlertDialog.Builder and not to the Dialog itself. AlertDialog.Builder class doesn't have any method named dismiss() . Save a reference to the Dialog which is returned to you when you call create() or show() method from AlertDialog.Builder class.

One more thing, since you are calling create() and show() methods at the same time, do you really want to call both the methods? I believe calling only show() method would suffice for you here. From Developer Reference public AlertDialog show () : Creates a AlertDialog with the arguments supplied to this builder and show()'s the dialog.

Answer 2

You need to store the result of calling b.create() ; that's what you need to call dismiss() on.