java - Service insert more than expected on database -

i'm getting contacts calllog , inserting on database using service contentobserver. so, contentobserver keep watching if new changes happens calllog, , if yes, inside method onchange() calls method data in calllog , insert on database.

but, problem that, if make new call, there 1 new data, so, must inserted in database, 1 new row, inserts 3 rows. don't know why. tested on android 2.3 emulator , on emulator ok, on real 2.3 device happens. , in 2.1 emulator happens too.

so here code. service posted. thanks!

here service myapplicationservice.java

public class myapplicationservice extends service {      private handler handler = new handler();     private sqlitedatabase db;     private openhelper helper;      class myapplicationcontentobserver extends contentobserver {          public myapplicationcontentobserver(handler h) {              super(h);             helper = new openhelper(getapplicationcontext());             db = helper.getwritabledatabase();          }          @override         public boolean deliverselfnotifications() {              return true;          }          @override         public void onchange(boolean selfchange) {              super.onchange(selfchange);                      searchinsert();         }     }      @override     public ibinder onbind(intent arg0) {          return null;      }      @override     public void oncreate() {          db = datahandlerdb.createdb(this);         registercontentobservers();      }      @override     public void ondestroy() {          db.close();      }      private void searchinsert() {          cursor cursor = getcontentresolver().query(                 android.provider.calllog.calls.content_uri, null, null, null,                 android.provider.calllog.calls.date + " desc ");          if (cursor.movetofirst()) {              int numbercolumnid = cursor                     .getcolumnindex(android.provider.calllog.calls.number);             int durationid = cursor                     .getcolumnindex(android.provider.calllog.calls.duration);             int contactnameid = cursor                     .getcolumnindex(android.provider.calllog.calls.cached_name);             int numtypeid = cursor                     .getcolumnindex(android.provider.calllog.calls.cached_number_type);             int calltypeid = cursor                     .getcolumnindex(android.provider.calllog.calls.type);              date dt = new date();             int hours = dt.gethours();             int minutes = dt.getminutes();             int seconds = dt.getseconds();             string currtime = hours + ":" + minutes + ":" + seconds;              simpledateformat dateformat = new simpledateformat("m/d/yyyy");             date date = new date();              cursor.movetofirst();              string contactnumber = cursor.getstring(numbercolumnid);             string contactname = (null == cursor.getstring(contactnameid) ? ""                     : cursor.getstring(contactnameid));             string duration = cursor.getstring(durationid);             string numtype = cursor.getstring(numtypeid);             string calltype = cursor.getstring(calltypeid);              contentvalues values = new contentvalues();              values.put("contact_id", 1);             values.put("contact_name", contactname);             values.put("number_type", numtype);             values.put("contact_number", contactnumber);             values.put("duration", duration);             values.put("date", dateformat.format(date));             values.put("current_time", currtime);             values.put("cont", 1);             values.put("type", calltype);              if (!db.isopen()) {                 db = getapplicationcontext()                         .openorcreatedatabase(                                 "/data/data/com.myapp.app/databases/my_database.db",                                 sqlitedatabase.open_readwrite, null);             }             db.insert(datahandlerdb.table_name_2, null, values);             cursor.close();          }      }      public void registercontentobservers() {          this.getapplicationcontext()                 .getcontentresolver()                 .registercontentobserver(                         android.provider.calllog.calls.content_uri, true,                         new myapplicationcontentobserver(handler));      }  }