gistfile1.txt

    addListener(new InputListener() {
			@Override
			public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
				if (event.getTarget() == DefaultDialog.this && x < 0 || y < 0 || x > getWidth() || y > getHeight()) {
					hide();
					return true;
				}
				return false;
			}

			@Override
			public boolean keyDown(InputEvent event, int keycode) {
				switch (keycode) {
					case Keys.BACK:
					case Keys.ESCAPE:
						hide();
				}
				return false;
			}
		});