Add Events on Google Calendar on Android

package com.ram.calender;
import java.util.Date;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.widget.TextView;

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

Date d = new Date();
d.setHours(8);
d.setMinutes(30);
d.setSeconds(30);
long startTime = d.getTime();
d.setHours(12);
d.setMinutes(35);
d.setSeconds(35);
long endtime = d.getTime();

ret_list=(TextView)findViewById(R.id.txt_retlist);

addToCalendar(this,"ramachanderan",startTime,endtime);
}


private static void addToCalendar(Context ctx, final String title, final long dtstart, final long dtend) {
final ContentResolver cr = ctx.getContentResolver();
Cursor cursor ;
if (Integer.parseInt(Build.VERSION.SDK) == 8 )
cursor = cr.query(Uri.parse("content://com.android.calendar/calendars"), new String[]{ "_id", "displayname" }, null, null, null);
else
cursor = cr.query(Uri.parse("content://calendar/calendars"), new String[]{ "_id", "displayname" }, null, null, null);
if ( cursor.moveToFirst() ) {
final String[] calNames = new String[cursor.getCount()];
final int[] calIds = new int[cursor.getCount()];
for (int i = 0; i < calNames.length; i++) {
calIds[i] = cursor.getInt(0);
calNames[i] = cursor.getString(1);
cursor.moveToNext();
}

AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
builder.setSingleChoiceItems(calNames, -1, new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
ContentValues cv = new ContentValues();
cv.put("calendar_id", calIds[which]);
cv.put("title", title);
cv.put("dtstart", dtstart );
cv.put("hasAlarm", 1);
cv.put("dtend", dtend);

Uri newEvent ;
if (Integer.parseInt(Build.VERSION.SDK) == 8 )
newEvent = cr.insert(Uri.parse("content://com.android.calendar/events"), cv);
else
newEvent = cr.insert(Uri.parse("content://com.android.calendar/events"), cv);

if (newEvent != null) {
long id = Long.parseLong( newEvent.getLastPathSegment() );
ContentValues values = new ContentValues();
values.put( "event_id", id );
values.put( "method", 1 );
values.put( "minutes", 15 ); // 15 minuti
if (Integer.parseInt(Build.VERSION.SDK) == 8 )
cr.insert( Uri.parse( "content://com.android.calendar/reminders" ), values );
else
cr.insert( Uri.parse( "content://calendar/reminders" ), values );

}
dialog.cancel();
}

});

builder.create().show();
}
cursor.close();
}

}