I'm working on an app in which i'm using a custom date and time picker.
I've created a dialog box and inside that i'm showing date and time picker respectively now I want to set a minimum and maximum limit for the date picker.
Such as one should not be able to select the previous date from today and not more than a month ahead. 
This is my code 

```
  AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
            final DatePicker picker = new DatePicker(getActivity());
            try {
                Field f[] = picker.getClass().getDeclaredFields();
                for (Field field : f) {
                    if (field.getName().equals("mYearPicker") || field.getName().equals("mYearSpinner")) {
                        field.setAccessible(true);
                        Object yearPicker = new Object();
                        yearPicker = field.get(picker);
                        ((View) yearPicker).setVisibility(View.GONE);
                    }
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
            picker.setCalendarViewShown(false);
            picker.setMinDate(new  Date().getTime());

            builder.setTitle("Please select date on which you would be leaving :")
                    .setView(picker)
                    .setPositiveButton("OK",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int whichButton) {
                                    SimpleDateFormat parseFormat = new SimpleDateFormat("EEE dd MMM");
                                    Date date1 = new Date();
                                    date1.setDate(picker.getDayOfMonth());
                                    date1.setMonth(picker.getMonth());
                                    final String s = parseFormat.format(date1);
                                    Log.e("DATE", s);
                                    SimpleDateFormat sdf=new SimpleDateFormat("MM-dd-yyyy");
                                    Date date2=new Date();
                                    date2.setDate(picker.getDayOfMonth());
                                    date2.setMonth(picker.getMonth());
                                    final String s2=sdf.format(date2);

                                    //Time picker
                                    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                                    final TimePicker picker = new TimePicker(getActivity());
                                    picker.setIs24HourView(true);
                                    builder.setTitle("Please select time at which you would be leaving :")
                                            .setView(picker)
                                            .setPositiveButton("OK",
                                                    new DialogInterface.OnClickListener() {
                                                        public void onClick(DialogInterface dialog, int whichButton) {
                                                            int hour = picker.getCurrentHour();
                                                            int minute = picker.getCurrentMinute();
                                                            leaving.setTextSize(14);

                                                            leaving.setText(s + " " + hour + ":" + minute);
                                                            inTime=s2+" "+hour+":"+minute;
                                                            Log.e("inTime ",inTime);
                                                        }
                                                    })
                                            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                                                public void onClick(DialogInterface dialog, int whichButton) {
                                                    leaving.setText("");
                                                    inTime="";
                                                    dialog.dismiss();
                                                }
                                            }).create().show();
                                    //Time picker
                                }
                            }
                    )
                    .setNegativeButton("Cancel",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int whichButton) {
                                    leaving.setText("");
                                    inTime="";
                                    dialog.dismiss();
                                }
                            }
                    )
                    .create().show();

```

Please help. Thank you