java.lang.IllegalArgumentException: Bad class: class java.lang.String?

Question

Please I get this error that I do not understand.

This is the code:

Cursor cursor = context.getContentResolver()
            .query(Uri.parse("content://com.android.calendar/events"),
                    new String[] { "calendar_id", "title", "description",
                            "dtstart", "dtend", "eventLocation","allDay" }, null,
                    null, null);
    cursor.moveToFirst();
    // fetching calendars name
    String CNames[] = new String[cursor.getCount()];

    for (int i = 0; i < CNames.length; i++) {

        DateFormat df = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
        String day =df.format(cursor.getString(3));

This is the LogCat:

08-30 10:07:09.560: E/AndroidRuntime(5008): FATAL EXCEPTION: main
08-30 10:07:09.560: E/AndroidRuntime(5008): java.lang.IllegalArgumentException: Bad     class: class java.lang.String
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     java.text.DateFormat.format(DateFormat.java:296)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     java.text.Format.format(Format.java:93)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     com.examples.android.calendar.Utility.readCalendarEvent(Utility.java:46)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     com.examples.android.calendar.CalendarView$1.run(CalendarView.java:185)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     android.os.Handler.handleCallback(Handler.java:730)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     android.os.Handler.dispatchMessage(Handler.java:92)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     android.os.Looper.loop(Looper.java:137)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     android.app.ActivityThread.main(ActivityThread.java:5103)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     java.lang.reflect.Method.invokeNative(Native Method)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     java.lang.reflect.Method.invoke(Method.java:525)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-30 10:07:09.560: E/AndroidRuntime(5008):     at     dalvik.system.NativeStart.main(Native Method)

It looks like there is a string in the third column of the cursor. What are you trying to do? Convert from a String date to a String date? — Juangcg
– Juangcg, Commented Aug 30, 2013 at 8:22

Rajesh · Accepted Answer · 2013-08-30 08:35:38Z

2

Read the API Guide on Calendar Provider to know about accessing the calendar events.

The mistakes you are making are:

Do not use hard coded string literals ("dtstart", ..); use the constants defined in CalendarContract.EventsColumns for the column names.
The DTSTART and DTEND columns contain the start and end time in long format (milliseconds since epoch).

answered Aug 30, 2013 at 8:35

Rajesh

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