Android: How to create a Dialog without a title?

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I’m trying to generate a custom dialog in Android.
I create my Dialog like this:

dialog = new Dialog(this);
dialog.setContentView(R.layout.my_dialog);

Everythings works fine except for the title of the Dialog.
Even if I don’t set the title of the dialog the dialog popup has a blank space at the position of the dialog.

Is there any way to hide this part of the Dialog?

I tried it with an AlertDialog but it seems the layout is not set properly: 

LayoutInflater inflater = 
    (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.map_dialog, null);

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(view);

// dialog = new Dialog(this);
// dialog.setContentView(R.layout.map_dialog);

dialog = builder.create();

((TextView) dialog.findViewById(R.id.nr)).setText(number);

If I use this code I get a null Pointer Exception in the last line. The dialog is not null so the TextView I try to retrieve does not exist.
If I uncomment the part where I use the Dialog Constructor everything works fine but for the title above my dialog layout.

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