How to know that the content provider of calls has changed

Hey, I'd like to know if there is a way to know if the content provider of callings has changed. I mean, if I make a call, or I answer a call, it returns a "flag" that a new log has been added to the call log, or the place where Android store informations about callings.

Because, when I make a call, Android stores the number, the contact name(if exists), the hour of the calling, the duration, blah blah blah, all in the content provider. So is there a way to capture this "flag" that says the content provider of callings is bigger, I mean, that a new data has been inserted on the content provider CallLog.Calls.

(Updated)

So, I still have a lot of doubts related to this issue. I don't know where to register the content observer. My intention is when something change in the CallLog content provider, the insert method of the code will be used.

I mean, the code wont do anything unless new data has been added to the CallLog content开发者_运维技巧 provider. If some data has been added to the CallLog content provider, then the code will query the new data, and then will insert. I wanna do this because withou a Content observer the application was inserting data in the database that was already inserted every time I run the application, got it?

So here is my code. If someone could tell me where to put the registerContentObserver and everything else is needed I thank you.

package com.psyhclo;

import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;

import com.psyhclo.R;
import com.psyhclo.CallDataHelper.OpenHelper;

import android.app.Activity;
import android.app.ListActivity;
import android.database.ContentObserver;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.os.Handler;
import android.provider.ContactsContract.RawContacts;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.content.ContentValues;
import android.content.Context;
import android.content.ContentProvider;

public class RatedCalls extends ListActivity {

private SQLiteDatabase db;
private CallDataHelper dh = null;
StringBuilder sb = new StringBuilder();
OpenHelper openHelper = new OpenHelper(RatedCalls.this);

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Cursor cursor = getContentResolver().query(
            android.provider.CallLog.Calls.CONTENT_URI, null, null, null,
            android.provider.CallLog.Calls.DATE + " DESC ");

    dh = new CallDataHelper(this);
    db = openHelper.getWritableDatabase();

    startManagingCursor(cursor);
    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 dateId = cursor.getColumnIndex(android.provider.CallLog.Calls.DATE);
    int numTypeId = cursor
            .getColumnIndex(android.provider.CallLog.Calls.CACHED_NUMBER_TYPE);

    Date dt = new Date();
    int hours = dt.getHours();
    int minutes = dt.getMinutes();
    int seconds = dt.getSeconds();
    String currTime = hours + ":" + minutes + ":" + seconds;

    ArrayList<String> callList = new ArrayList<String>();
    if (cursor.moveToFirst()) {

        do {

            String contactNumber = cursor.getString(numberColumnId);
            String contactName = cursor.getString(contactNameId);
            String duration = cursor.getString(durationId);
            String callDate = DateFormat.getDateInstance().format(dateId);
            String numType = cursor.getString(numTypeId);

            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", callDate);
            values.put("current_time", currTime);
            values.put("cont", 1);

            this.db.insert(CallDataHelper.TABLE_NAME, null, values);

            Toast.makeText(getBaseContext(), "Inserted!", Toast.LENGTH_LONG);
            callList.add("Contact Number: " + contactNumber
                    + "\nContact Name: " + contactName + "\nDuration: "
                    + duration + "\nDate: " + callDate);

        } while (cursor.moveToNext());
    }
    setListAdapter(new ArrayAdapter<String>(this, R.layout.listitem,
            callList));
    ListView lv = getListView();
    lv.setTextFilterEnabled(true);

    lv.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            Toast.makeText(getApplicationContext(),
                    ((TextView) view).getText(), Toast.LENGTH_SHORT).show();

        }
    });
}
}

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Have a look at the method registerContentObserver() in the ContentResolver class. This allows you to register a callback if the dataset behind the content provider changes.

See also this blog posting for a working example how to observe a content provider for changes.