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Show Only Current and previous month in date picker dialog.

 datePickerDialog = new DatePickerDialog(DateConvertActivity.this, new DatePickerDialog.OnDateSetListener() 
 @Override
 public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) 
 String s = "" + dayOfMonth + "-" + (month + 1) + "-" + year;
 edtDate.setText(s);
 
 , mDay, mMonth, mYear);
 datePickerDialog.getDatePicker().updateDate(mYear, mMonth, mDay);

Try this solution. It's from first day of previous month to this day.

In Kotlin:

private fun setupUi() 
 // Get calendar instance
 val calendar = Calendar.getInstance()

 // Get current time
 val currentYear = calendar.get(Calendar.YEAR)
 val currentMonth = calendar.get(Calendar.MONTH)
 val currentDay = calendar.get(Calendar.DAY_OF_MONTH)

 // Create listener
 val listener = DatePickerDialog.OnDateSetListener view, year, month, day ->
 // Show Toast after selection
 Toast.makeText(this, "Selected: $day.$month.$year", Toast.LENGTH_SHORT).show()
 

 // Max = current
 val maxTime = calendar.timeInMillis

 // Move day as first day of the month
 calendar.set(Calendar.DAY_OF_MONTH, 1)
 // Move "month" for previous one
 calendar.add(Calendar.MONTH, -1)

 // Min = time after changes
 val minTime = calendar.timeInMillis

 // Create dialog
 val datePickerDialog = DatePickerDialog(
 this,
 listener,
 currentYear,
 currentMonth,
 currentDay
 ).apply 
 // Set dates
 datePicker.maxDate = maxTime
 datePicker.minDate = minTime
 

 // Show dialog
 datePickerDialog.show()

And in Java:

private void setupUi() 
 // Get calendar instance
 Calendar calendar = Calendar.getInstance();

 // Get current time
 int currentYear = calendar.get(Calendar.YEAR);
 int currentMonth = calendar.get(Calendar.MONTH);
 int currentDay = calendar.get(Calendar.DAY_OF_MONTH);

 // Create listener
 DatePickerDialog.OnDateSetListener listener = new DatePickerDialog.OnDateSetListener() 
 @Override
 public void onDateSet(DatePicker view, int year, int month, int day) 
 // Show Toast after selection
 Toast.makeText(MainActivity.this, String.format("Selected: %s.%s.%s", day, month, year), Toast.LENGTH_SHORT).show();
 
 ;

 // Max = current
 long maxTime = calendar.getTimeInMillis();

 // Move day as first day of the month
 calendar.set(Calendar.DAY_OF_MONTH, 1);
 // Move "month" for previous one
 calendar.add(Calendar.MONTH, -1);

 // Min = time after changes
 long minTime = calendar.getTimeInMillis();

 // Create dialog
 DatePickerDialog datePickerDialog = new DatePickerDialog(
 this,
 listener,
 currentYear,
 currentMonth,
 currentDay
 );

 // Set dates
 datePickerDialog.getDatePicker().setMaxDate(maxTime);
 datePickerDialog.getDatePicker().setMinDate(minTime);

 // Show dialog
 datePickerDialog.show();

If you need WHOLE current month (from first to last day) you can replace par with this Kotlin code:

// Move day as first day of the month
calendar.set(Calendar.DAY_OF_MONTH, 1)
// Move "month" for previous one
calendar.add(Calendar.MONTH, -1)

// Min = time after changes
val minTime = calendar.timeInMillis


// Move day as first day of the month
calendar.set(Calendar.DAY_OF_MONTH, 1)
// Move to next month
calendar.add(Calendar.MONTH, +2)
// Go back one day (so last day of current month)
calendar.add(Calendar.DAY_OF_MONTH, -1)

// Max = current
val maxTime = calendar.timeInMillis

and in Java:

// Move day as first day of the month
calendar.set(Calendar.DAY_OF_MONTH, 1);
// Move "month" for previous one
calendar.add(Calendar.MONTH, -1);

// Min = time after changes
long minTime = calendar.getTimeInMillis();

// Move day as first day of the month
calendar.set(Calendar.DAY_OF_MONTH, 1);
// Move to next month
calendar.add(Calendar.MONTH, +2);
// Go back one day (so last day of current month)
calendar.add(Calendar.DAY_OF_MONTH, -1);

// Max = current
long maxTime = calendar.getTimeInMillis();

Pick the date in Timestamp see below code

Long tsLong = System.currentTimeMillis()

Then convert tsLong to any specific format and extract the one you need.

For Reference: Android TimeStamp

datePickerDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);