Store phone blacklist in content provider (3/4)

package com.android.contacts.calllog;

import android.content.ContentValues;

import android.content.Context;

import android.content.Intent;

import android.database.Cursor;

import android.provider.ContactsContract.Contacts;

import android.provider.ContactsContract.PhoneLookup;

import android.provider.Settings;

import android.provider.Telephony;

import android.telephony.PhoneNumberUtils;

import android.text.TextUtils;

import android.widget.Toast;

    private final Context mContext;

    private final String mCurrentCountryIso;

    // Blacklist support

    private static final String INSERT_BLACKLIST = "com.android.phone.INSERT_BLACKLIST";

    private static final String BLACKLIST_NUMBER = "number";

    public ContactInfoHelper(Context context, String currentCountryIso) {

        mContext = context;

        mCurrentCountryIso = currentCountryIso;

     * @param number the number to be blacklisted

     */

    public void addNumberToBlacklist(String number) {

                Intent intent = new Intent(INSERT_BLACKLIST);

        intent.putExtra(BLACKLIST_NUMBER, number);

        mContext.sendBroadcast(intent);

        ContentValues cv = new ContentValues();

        cv.put(Telephony.Blacklist.PHONE_MODE, 1);

        Uri uri = Uri.withAppendedPath(Telephony.Blacklist.CONTENT_FILTER_BYNUMBER_URI, number);

        int count = mContext.getContentResolver().update(uri, cv, null, null);

        if (count != 0) {

            // Give the user some feedback

            String message = mContext.getString(R.string.toast_added_to_blacklist, number);

            Toast.makeText(mContext, message, Toast.LENGTH_SHORT).show();

        }

    }

    /**

     * Checks whether calls can be blacklisted; that is, whether the