Программа для определения дня недели по дате

switch (v.getId()){ //Syntax error on token "{", } expected after this token
        //Getting data from DatePicker
        int yearForWeek = datePicker1.getYear();
        int monthForWeek = datePicker1.getMonth();
        int dayForWeek = datePicker1.getDayOfMonth();
 
        //Setting up Calendar, calculating weeknumber and making toast for user
        GregorianCalendar cal = new GregorianCalendar(
        yearForWeek, monthForWeek, dayForWeek);
 
        //Calculating weeknumber
        int weekNumber = cal.get(GregorianCalendar.WEEK_OF_YEAR);
 
        //Calculating day of the week
        int dayInNumber = cal.get(GregorianCalendar.DAY_OF_WEEK);
        String dayOfTheWeek = null;
 
        if(dayInNumber == 1){dayOfTheWeek="Monday";}
        else if(dayInNumber == 2){dayOfTheWeek="Tuesday";}
        else if(dayInNumber == 3){dayOfTheWeek="Wednesday";}
        else if(dayInNumber == 4){dayOfTheWeek="Thursday";}
        else if(dayInNumber == 5){dayOfTheWeek="Friday";}
        else if(dayInNumber == 6){dayOfTheWeek="Saturday";}
        else if(dayInNumber == 7){dayOfTheWeek="Sunday";}
 
        Toast.makeText(getBaseContext(),
                "The chosen date is " + dayOfTheWeek +
                " in week " + weekNumber,
                Toast.LENGTH_LONG).show();
        case R.id.button1: //Multiple markers at this line: - Syntax error on token "case", assert expected;- Syntax error on token ":", ; expected;    - Type mismatch: cannot convert from int to boolean
        break;
        }//Syntax error on token "}", delete this token

final String[] m = {"Январь", "Февраль", "Март", "Апрель", "Май", "Июнь", "Июль", "Август", "Сентябрь", "Октябрь", "Ноябрь", "Декабрь"};
 
        Calendar calendar_local = (Calendar) calendar.clone();
        
        int year = calendar_local.get(Calendar.YEAR);       
        int month = calendar_local.get(Calendar.MONTH);
        
        TextView tvCurrentMonth = (TextView) viewLayout.findViewById(R.id.tvCurrentMonth);
        tvCurrentMonth.setText(m[month] + " " + String.valueOf(year));
 
        int dayOfWeek = calendar_local.get(Calendar.DAY_OF_WEEK) - 1;
        if (dayOfWeek == 0) dayOfWeek = 7;