add android calendar events using java

Question

Hi I am trying to add event to android calendar. I am new to android development. Please help me how can I add events to android calendar. Here is my code which does not work. When I run it, it gives me a message "The application calendar (process com.something.something) has stopped unexpectedly"and has this button "Force to stop". Here is my code

package com.zafar.calendar;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;

public class Calendar extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Cursor cursor=getContentResolver().query(Uri.parse("content://com.android.calendar/calendars"), new String[]{"_id", "displayname"}, null, null, null);

    cursor.moveToFirst();
    // Get calendars name
    String calendarNames[] = new String[cursor.getCount()];
    // Get calendars id
    int[] calendarId = new int[cursor.getCount()];
    for (int i = 0; i < calendarNames.length; i++)
    {
             calendarId[i] = cursor.getInt(0);
             calendarNames[i] = cursor.getString(1);
             cursor.moveToNext();
    }
    cursor.close();

    ContentValues contentEvent = new ContentValues();
     contentEvent.put("calendar_id", 1);
     contentEvent.put("title", "Wedding");
     contentEvent.put("eventLocation", "New York");
     contentEvent.put("dtstart","1335432431000");
     contentEvent.put("dtend","1335436031000");

     Uri eventsUri = Uri.parse("content://com.android.calendar/events");
     getContentResolver().insert(eventsUri, contentEvent);

}
}

Update Here is my menifest file

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".Calendar"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <uses-permission android:name="android.permission.READ_CALENDAR"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_CALENDAR"></uses-permission>
</application>

Logcat

I am new to android development. I do not know logcat exactly. I ran logcat commmand on command prompt and I got this

    04-28 09:16:57.956: D/AndroidRuntime(333): Shutting down VM
04-28 09:16:57.956: W/dalvikvm(333): threadid=1: thread exiting with uncaught exception (group=0x40015560)
04-28 09:16:57.975: E/AndroidRuntime(333): FATAL EXCEPTION: main
04-28 09:16:57.975: E/AndroidRuntime(333): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zafar.calendar/com.zafar.calendar.Calendar}: java.lang.NullPointerException
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.os.Looper.loop(Looper.java:123)
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.app.ActivityThread.main(ActivityThread.java:3683)
04-28 09:16:57.975: E/AndroidRuntime(333):  at java.lang.reflect.Method.invokeNative(Native Method)
04-28 09:16:57.975: E/AndroidRuntime(333):  at java.lang.reflect.Method.invoke(Method.java:507)
04-28 09:16:57.975: E/AndroidRuntime(333):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-28 09:16:57.975: E/AndroidRuntime(333):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-28 09:16:57.975: E/AndroidRuntime(333):  at dalvik.system.NativeStart.main(Native Method)
04-28 09:16:57.975: E/AndroidRuntime(333): Caused by: java.lang.NullPointerException
04-28 09:16:57.975: E/AndroidRuntime(333):  at com.zafar.calendar.Calendar.onCreate(Calendar.java:51)
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-28 09:16:57.975: E/AndroidRuntime(333):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
04-28 09:16:57.975: E/AndroidRuntime(333):  ... 11 more
04-28 09:21:58.095: I/Process(333): Sending signal. PID: 333 SIG: 9

Answer 1

Mistake in your code:

1. new String[]{"calendar_id", "displayname"}, null, null, null);

There is no column exists name calendar_id in Calendar database. Correct is _id not calendar_id. So it will be new String[]{"_id", "displayname"}, null, null, null);

And see this reference. https://stackoverflow.com/a/10310258 And http://android.arnodenhond.com/tutorials/calendar

EDIT

For inserting new event, 3 values are required. Calendar_id, EventStartTime And EventEndTime. Without these values you cannot insert new event. EventStartTime and EventEndTime need into epoch format.

For normal date to epoch date: https://stackoverflow.com/a/6687502/1160207
For epoch to normal date: https://stackoverflow.com/a/10028980/1160207

Here is the code that perfectly working to me.

Cursor cursor=getContentResolver().query(Uri.parse("content://com.android.calendar/calendars"), new String[]{"_id", "displayname"}, null, null, null);

cursor.moveToFirst();
// Get calendars name
String calendarNames[] = new String[cursor.getCount()];
// Get calendars id
int[] calendarId = new int[cursor.getCount()];
for (int i = 0; i < calendarNames.length; i++)
{
         calendarId[i] = cursor.getInt(0);
         calendarNames[i] = cursor.getString(1);
         cursor.moveToNext();
}
cursor.close();

ContentValues contentEvent = new ContentValues();
 contentEvent.put("calendar_id", 1);
 contentEvent.put("title", "Wedding");
 contentEvent.put("eventLocation", "New York");                
 contentEvent.put("dtstart","1335432431000");
 contentEvent.put("dtend","1335436031000");


 Uri eventsUri = Uri.parse("content://com.android.calendar/events");
 getContentResolver().insert(eventsUri, contentEvent);

Hope this will help you. And don't forget to accept it if it is helpful to you.

Thanks...

Answer 2

If there are specific calendar applications you wish to integrate with, contact their developers and determine if they offer an API. So, for example, the Calendar application from the Android open source project, that Mayra cites, offers no documented and supported APIs. Google has even explicitly told developers to not use the techniques outlined in the tutorial Mayra cites.

Another option is for you to add events to the Internet calendar in question. For example, the best way to add events to the Calendar application from the Android open source project is to add the event to the user's Google Calendar via the appropriate GData APIs.