title: how to not allow user select past date in datepicker?
body: <p>I would like to do when user select the past date in datepicker, it should not accept yesterday date. My application will prompt message to inform user cant select less than current date.anyone guide me please ?...Thank you </p>
  
  <pre><code>mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
              Button pickDate_btn = (Button) findViewById(R.id.pickDate);
              pickDate_btn.setOnClickListener(new View.OnClickListener() {
  
              public void onClick(View v) {
                  showDialog(DATE_DIALOG_ID);
              }
          });
  
          final Calendar now = Calendar.getInstance();
          mYear = now.get(Calendar.YEAR);
          mMonth = now.get(Calendar.MONTH);
          mDay = now.get(Calendar.DAY_OF_MONTH);
  
          updateDisplay();      
  
  @Override
      protected Dialog onCreateDialog(int id) {
          switch (id) {
              case DATE_DIALOG_ID:
                  return new DatePickerDialog(this,
                              mDateSetListener,
                              mYear, mMonth, mDay);
          }
          return null;
      }
  
      @Override
      protected void onPrepareDialog(int id, Dialog dialog) {
          switch (id) {
  
              case DATE_DIALOG_ID:
                  ((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay);
                  break;
          }
      }    
  
      private void updateDisplay() {
          mDateDisplay.setText(
              new StringBuilder()
                      // Month is 0 based so add 1
                      .append(mDay).append("-")
                      .append(mMonth + 1).append("-")
                      .append(mYear).append(" "));
      }
  
      private DatePickerDialog.OnDateSetListener mDateSetListener =
              new DatePickerDialog.OnDateSetListener() {
  
      @Override
      public void onDateSet(DatePicker view, int year,int monthOfYear, int dayOfMonth) {
                      // TODO Auto-generated method stub
  
              mYear = year;
                      mMonth = monthOfYear;
                      mDay = dayOfMonth;
                      updateDisplay();
  
      //should add code here?             
                  }
              };
  </code></pre>