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copied!<p>Use the below simple code to add the days dynamically.</p> <pre><code>int Days = 50; // this is the input . you can change it in argument. the format of the date also changeable as per your requirement. try { Date date = null; String str = "2013-06-04"; SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); date = formatter.parse(str); Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.add(Calendar.DATE,Days ); System.out.println("" + formatter.format(calendar.getTime())); } catch (Exception e) { e.printStackTrace(); } </code></pre> <p>Hope this helps you. </p> <p>EDIT .</p> <p>Hi this is the full working code.</p> <pre><code>import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import android.app.Activity; import android.app.DatePickerDialog; import android.app.Dialog; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.DatePicker; import android.widget.TextView; public class MyAndroidAppActivity extends Activity { private TextView tvDisplayDate; private DatePicker dpResult; private Button btnChangeDate; private int year; private int month; private int day; static final int DATE_DIALOG_ID = 999; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); setCurrentDateOnView(); addListenerOnButton(); } // display current date public void setCurrentDateOnView() { tvDisplayDate = (TextView) findViewById(R.id.tvDate); dpResult = (DatePicker) findViewById(R.id.dpResult); final Calendar c = Calendar.getInstance(); year = c.get(Calendar.YEAR); month = c.get(Calendar.MONTH); day = c.get(Calendar.DAY_OF_MONTH); // set current date into textview tvDisplayDate.setText(new StringBuilder() // Month is 0 based, just add 1 .append(month + 1).append("-").append(day).append("-") .append(year).append(" ")); // set current date into datepicker dpResult.init(year, month, day, null); } public void addListenerOnButton() { btnChangeDate = (Button) findViewById(R.id.btnChangeDate); btnChangeDate.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { showDialog(DATE_DIALOG_ID); } }); } @Override protected Dialog onCreateDialog(int id) { switch (id) { case DATE_DIALOG_ID: // set date picker as current date return new DatePickerDialog(this, datePickerListener, year, month, day); } return null; } private DatePickerDialog.OnDateSetListener datePickerListener = new DatePickerDialog.OnDateSetListener() { // when dialog box is closed, below method will be called. public void onDateSet(DatePicker view, int selectedYear, int selectedMonth, int selectedDay) { year = selectedYear; month = selectedMonth; day = selectedDay; String str= year+"-"+(month+1)+"-"+day; System.out.println(" rrrrrr " +str); tvDisplayDate.setText(str); // this is the current date. tvDisplayDate.setText(" Old Date" + str + "After adding 50 days" +dateadding(50, str) ); // set selected date into datepicker also dpResult.init(year, month, day, null); } }; String dateadding(int DaystoAdd,String Date) { int Days = DaystoAdd; // this is the input . you can change it in argument. the format of the date also changeable as per your requirement. String finaldate=""; try { Date date = null; String str = Date; SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); date = formatter.parse(str); Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.add(Calendar.DATE,Days ); finaldate= formatter.format(calendar.getTime()); } catch (Exception e) { e.printStackTrace(); } return finaldate; } } </code></pre> <p>DESIGN LINES </p> <pre><code><?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <Button android:id="@+id/btnChangeDate" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Change Date" /> <TextView android:id="@+id/lblDate" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Current Date (M-D-YYYY): " android:textAppearance="?android:attr/textAppearanceLarge" /> <TextView android:id="@+id/tvDate" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="" android:textAppearance="?android:attr/textAppearanceLarge" /> <DatePicker android:id="@+id/dpResult" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> </code></pre>

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