Question

I have tried to use this code (as I have seen in a tutorial)

Calendar cal = Calendar.getInstance();  
Intent intent = new Intent(Intent.ACTION_EDIT);
intent.setType("vnd.android.cursor.item/event");
intent.putExtra("beginTime", dateStart.getTime());
intent.putExtra("allDay", false);
intent.putExtra("rrule", "FREQ=DAILY");
intent.putExtra("endTime", dateEnd.getTime());
intent.putExtra("hasAlarm", 1);
startActivity(intent);

to add an event on integrated Calendar in android

But as I wrote get a NullPointerException error on the line

startActivity(intent);

With this stack

07-17 19:12:05.469: W/System.err(30939): java.lang.NullPointerException
07-17 19:12:05.469: W/System.err(30939):    at android.app.Activity.startActivityForResult(Activity.java:2827)
07-17 19:12:05.469: W/System.err(30939):    at android.app.Activity.startActivity(Activity.java:2933)
07-17 19:12:05.469: W/System.err(30939):    at myapplication.beachparty.utility.MyUtility.addEventToCalendar(MyUtility.java:44)
07-17 19:12:05.469: W/System.err(30939):    at myapplication.beachparty.it.PartyDetails$2.onClick(PartyDetails.java:114)
07-17 19:12:05.469: W/System.err(30939):    at android.view.View.performClick(View.java:2485)
07-17 19:12:05.479: W/System.err(30939):    at android.view.View$PerformClick.run(View.java:9080)
07-17 19:12:05.479: W/System.err(30939):    at android.os.Handler.handleCallback(Handler.java:587)
07-17 19:12:05.499: W/System.err(30939):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-17 19:12:05.499: W/System.err(30939):    at android.os.Looper.loop(Looper.java:130)
07-17 19:12:05.499: W/System.err(30939):    at android.app.ActivityThread.main(ActivityThread.java:3687)
07-17 19:12:05.499: W/System.err(30939):    at java.lang.reflect.Method.invokeNative(Native Method)
07-17 19:12:05.499: W/System.err(30939):    at java.lang.reflect.Method.invoke(Method.java:507)
07-17 19:12:05.499: W/System.err(30939):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
07-17 19:12:05.499: W/System.err(30939):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
07-17 19:12:05.499: W/System.err(30939):    at dalvik.system.NativeStart.main(Native Method)
07-17 19:12:07.069: W/System.err(30939): java.lang.NullPointerException
07-17 19:12:07.069: W/System.err(30939):    at android.app.Activity.startActivityForResult(Activity.java:2827)
07-17 19:12:07.069: W/System.err(30939):    at android.app.Activity.startActivity(Activity.java:2933)
07-17 19:12:07.069: W/System.err(30939):    at myapplication.beachparty.utility.MyUtility.addEventToCalendar(MyUtility.java:44)
07-17 19:12:07.069: W/System.err(30939):    at myapplication.beachparty.it.PartyDetails$3.onClick(PartyDetails.java:128)
07-17 19:12:07.069: W/System.err(30939):    at android.view.View.performClick(View.java:2485)
07-17 19:12:07.069: W/System.err(30939):    at android.view.View$PerformClick.run(View.java:9080)
07-17 19:12:07.069: W/System.err(30939):    at android.os.Handler.handleCallback(Handler.java:587)
07-17 19:12:07.069: W/System.err(30939):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-17 19:12:07.069: W/System.err(30939):    at android.os.Looper.loop(Looper.java:130)
07-17 19:12:07.069: W/System.err(30939):    at android.app.ActivityThread.main(ActivityThread.java:3687)
07-17 19:12:07.069: W/System.err(30939):    at java.lang.reflect.Method.invokeNative(Native Method)
07-17 19:12:07.069: W/System.err(30939):    at java.lang.reflect.Method.invoke(Method.java:507)
07-17 19:12:07.069: W/System.err(30939):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
07-17 19:12:07.079: W/System.err(30939):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
07-17 19:12:07.079: W/System.err(30939):    at dalvik.system.NativeStart.main(Native Method)


dateStart

ad
dateEnd are
Date objects that indicates the day, mouth, year and time of event

I have tried also to change these lines with

intent.putExtra("beginTime", cal.getTimeInMillis());

and

intent.putExtra("endTime", cal.getTimeInMillis()+60*60*1000);

What is wrong?

NB
I have tried the code on Emulator and Samsung Galaxy. And use the API level 10 (GingerBread)

Answer 1

You cannot start this activity from another class simply invoking the method,

the line

startActivity(intent);

cause NullPointerException because haven’t a context

you should pass the Context in the method and write

mycontext.startActivity(intent);

In this way should works.