content: import React from 'react';
  import { makeStyles } from '@material-ui/core/styles';
  import Button from '@material-ui/core/Button';
  import Dialog from '@material-ui/core/Dialog';
  import ListItemText from '@material-ui/core/ListItemText';
  import ListItem from '@material-ui/core/ListItem';
  import List from '@material-ui/core/List';
  import Divider from '@material-ui/core/Divider';
  import AppBar from '@material-ui/core/AppBar';
  import Toolbar from '@material-ui/core/Toolbar';
  import IconButton from '@material-ui/core/IconButton';
  import Typography from '@material-ui/core/Typography';
  import CloseIcon from '@material-ui/icons/Close';
  import Slide from '@material-ui/core/Slide';
  
  const useStyles = makeStyles(theme => ({
    appBar: {
      position: 'relative',
    },
    title: {
      marginLeft: theme.spacing(2),
      flex: 1,
    },
  }));
  
  const Transition = React.forwardRef(function Transition(props, ref) {
    return <Slide direction="up" ref={ref} {...props} />;
  });
  
  function FullScreenDialog() {
    const classes = useStyles();
    const [open, setOpen] = React.useState(false);
  
    function handleClickOpen() {
      setOpen(true);
    }
  
    function handleClose() {
      setOpen(false);
    }
  
    return (
      <div>
        <Button variant="outlined" color="primary" onClick={handleClickOpen}>
          Open full-screen dialog
        </Button>
        <Dialog fullScreen open={open} onClose={handleClose} TransitionComponent={Transition}>
          <AppBar className={classes.appBar}>
            <Toolbar>
              <IconButton edge="start" color="inherit" onClick={handleClose} aria-label="Close">
                <CloseIcon />
              </IconButton>
              <Typography variant="h6" className={classes.title}>
                Sound
              </Typography>
              <Button color="inherit" onClick={handleClose}>
                save
              </Button>
            </Toolbar>
          </AppBar>
          <List>
            <ListItem button>
              <ListItemText primary="Phone ringtone" secondary="Titania" />
            </ListItem>
            <Divider />
            <ListItem button>
              <ListItemText primary="Default notification ringtone" secondary="Tethys" />
            </ListItem>
          </List>
        </Dialog>
      </div>
    );
  }
  
  export default FullScreenDialog;
  