我尝试做一个if-else语句，如果用户输入了过去的时间，它会提醒用户时间已经过去。而且我也无法在用户打开timedialogpicker时将其设置为当前时间。提前感谢。
代码：

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Calendar timeNow = Calendar.getInstance();
        timePickerDialog = new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                int currHour = calendar.get(Calendar.HOUR_OF_DAY);
                int currMin = calendar.get(Calendar.MINUTE);
                Time currTime = new Time(currHour, currMin); //This part display error
                if (currTime.getTimeInMillis() >= timeNow.getTimeInMillis()) { //This part display error
                    //it's after current
                    int hour = hourOfDay % 12;
                } else {
                    //it's before current'
                    Toast.makeText(getApplicationContext(), "Invalid Time", Toast.LENGTH_LONG).show();
                }
                time = "";
                time = hourOfDay+":"+minute;

                Userbook book = new Userbook(temp, time);

                db.collection("Booking").add(book).addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                    @Override
                    public void onSuccess(DocumentReference documentReference) {
                        Toast.makeText(MainActivity.this, "Note saved", Toast.LENGTH_SHORT).show();
                    }
                }).addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_SHORT).show();
                    }
                });
               Toast.makeText(MainActivity.this, "Time is "+currHour+":"+currMin, Toast.LENGTH_SHORT).show();
            }
        },timeNow.get(Calendar.HOUR_OF_DAY), timeNow.get(Calendar.MINUTE),false);
        timePickerDialog.show();
    }
});