Question

How to Call Calendar in my Application using Intents?

Answer 1

You need an Intent that looks something like this:

Intent calendarIntent = new Intent(Intent.ACTION_EDIT);  
calendarIntent.setType("vnd.android.cursor.item/event");
calendarIntent.putExtra("title", "Title");
calendarIntent.putExtra("beginTime", startTimeMillis);
calendarIntent.putExtra("endTime", endTimeMillis);
calendarIntent.putExtra("description", "Description");

You can then start it by calling this:

startActivity(calendarIntent);