In order to be as universal as possible, you can create a class with the prefix of all countries.
public class CountryToPhonePrefix {
public static String getPhone(String code) {
return country2phone.get(code.toUpperCase());
}
public static Map<String, String> getAll(){
return country2phone;
}
private static Map<String, String> country2phone = new HashMap<String, String>();
static {
country2phone.put("AF", "+93");
country2phone.put("AL", "+355");
country2phone.put("DZ", "+213");
country2phone.put("AD", "+376");
country2phone.put("AO", "+244");
country2phone.put("AG", "+1-268");
country2phone.put("AR", "+54");
country2phone.put("AM", "+374");
country2phone.put("AU", "+61");
country2phone.put("AT", "+43");
country2phone.put("AZ", "+994");
country2phone.put("BS", "+1-242");
country2phone.put("BH", "+973");
country2phone.put("BD", "+880");
country2phone.put("BB", "+1-246");
country2phone.put("BY", "+375");
country2phone.put("BE", "+32");
country2phone.put("BZ", "+501");
country2phone.put("BJ", "+229");
country2phone.put("BT", "+975");
country2phone.put("BO", "+591");
country2phone.put("BA", "+387");
country2phone.put("BW", "+267");
country2phone.put("BR", "+55");
country2phone.put("BN", "+673");
country2phone.put("BG", "+359");
country2phone.put("BF", "+226");
country2phone.put("BI", "+257");
country2phone.put("KH", "+855");
country2phone.put("CM", "+237");
country2phone.put("CA", "+1");
country2phone.put("CV", "+238");
country2phone.put("CF", "+236");
country2phone.put("TD", "+235");
country2phone.put("CL", "+56");
country2phone.put("CN", "+86");
country2phone.put("CO", "+57");
country2phone.put("KM", "+269");
country2phone.put("CD", "+243");
country2phone.put("CG", "+242");
country2phone.put("CR", "+506");
country2phone.put("CI", "+225");
country2phone.put("HR", "+385");
country2phone.put("CU", "+53");
country2phone.put("CY", "+357");
country2phone.put("CZ", "+420");
country2phone.put("DK", "+45");
country2phone.put("DJ", "+253");
country2phone.put("DM", "+1-767");
country2phone.put("DO", "+1-809and1-829");
country2phone.put("EC", "+593");
country2phone.put("EG", "+20");
country2phone.put("SV", "+503");
country2phone.put("GQ", "+240");
country2phone.put("ER", "+291");
country2phone.put("EE", "+372");
country2phone.put("ET", "+251");
country2phone.put("FJ", "+679");
country2phone.put("FI", "+358");
country2phone.put("FR", "+33");
country2phone.put("GA", "+241");
country2phone.put("GM", "+220");
country2phone.put("GE", "+995");
country2phone.put("DE", "+49");
country2phone.put("GH", "+233");
country2phone.put("GR", "+30");
country2phone.put("GD", "+1-473");
country2phone.put("GT", "+502");
country2phone.put("GN", "+224");
country2phone.put("GW", "+245");
country2phone.put("GY", "+592");
country2phone.put("HT", "+509");
country2phone.put("HN", "+504");
country2phone.put("HU", "+36");
country2phone.put("IS", "+354");
country2phone.put("IN", "+91");
country2phone.put("ID", "+62");
country2phone.put("IR", "+98");
country2phone.put("IQ", "+964");
country2phone.put("IE", "+353");
country2phone.put("IL", "+972");
country2phone.put("IT", "+39");
country2phone.put("JM", "+1-876");
country2phone.put("JP", "+81");
country2phone.put("JO", "+962");
country2phone.put("KZ", "+7");
country2phone.put("KE", "+254");
country2phone.put("KI", "+686");
country2phone.put("KP", "+850");
country2phone.put("KR", "+82");
country2phone.put("KW", "+965");
country2phone.put("KG", "+996");
country2phone.put("LA", "+856");
country2phone.put("LV", "+371");
country2phone.put("LB", "+961");
country2phone.put("LS", "+266");
country2phone.put("LR", "+231");
country2phone.put("LY", "+218");
country2phone.put("LI", "+423");
country2phone.put("LT", "+370");
country2phone.put("LU", "+352");
country2phone.put("MK", "+389");
country2phone.put("MG", "+261");
country2phone.put("MW", "+265");
country2phone.put("MY", "+60");
country2phone.put("MV", "+960");
country2phone.put("ML", "+223");
country2phone.put("MT", "+356");
country2phone.put("MH", "+692");
country2phone.put("MR", "+222");
country2phone.put("MU", "+230");
country2phone.put("MX", "+52");
country2phone.put("FM", "+691");
country2phone.put("MD", "+373");
country2phone.put("MC", "+377");
country2phone.put("MN", "+976");
country2phone.put("ME", "+382");
country2phone.put("MA", "+212");
country2phone.put("MZ", "+258");
country2phone.put("MM", "+95");
country2phone.put("NA", "+264");
country2phone.put("NR", "+674");
country2phone.put("NP", "+977");
country2phone.put("NL", "+31");
country2phone.put("NZ", "+64");
country2phone.put("NI", "+505");
country2phone.put("NE", "+227");
country2phone.put("NG", "+234");
country2phone.put("NO", "+47");
country2phone.put("OM", "+968");
country2phone.put("PK", "+92");
country2phone.put("PW", "+680");
country2phone.put("PA", "+507");
country2phone.put("PG", "+675");
country2phone.put("PY", "+595");
country2phone.put("PE", "+51");
country2phone.put("PH", "+63");
country2phone.put("PL", "+48");
country2phone.put("PT", "+351");
country2phone.put("QA", "+974");
country2phone.put("RO", "+40");
country2phone.put("RU", "+7");
country2phone.put("RW", "+250");
country2phone.put("KN", "+1-869");
country2phone.put("LC", "+1-758");
country2phone.put("VC", "+1-784");
country2phone.put("WS", "+685");
country2phone.put("SM", "+378");
country2phone.put("ST", "+239");
country2phone.put("SA", "+966");
country2phone.put("SN", "+221");
country2phone.put("RS", "+381");
country2phone.put("SC", "+248");
country2phone.put("SL", "+232");
country2phone.put("SG", "+65");
country2phone.put("SK", "+421");
country2phone.put("SI", "+386");
country2phone.put("SB", "+677");
country2phone.put("SO", "+252");
country2phone.put("ZA", "+27");
country2phone.put("ES", "+34");
country2phone.put("LK", "+94");
country2phone.put("SD", "+249");
country2phone.put("SR", "+597");
country2phone.put("SZ", "+268");
country2phone.put("SE", "+46");
country2phone.put("CH", "+41");
country2phone.put("SY", "+963");
country2phone.put("TJ", "+992");
country2phone.put("TZ", "+255");
country2phone.put("TH", "+66");
country2phone.put("TL", "+670");
country2phone.put("TG", "+228");
country2phone.put("TO", "+676");
country2phone.put("TT", "+1-868");
country2phone.put("TN", "+216");
country2phone.put("TR", "+90");
country2phone.put("TM", "+993");
country2phone.put("TV", "+688");
country2phone.put("UG", "+256");
country2phone.put("UA", "+380");
country2phone.put("AE", "+971");
country2phone.put("GB", "+44");
country2phone.put("US", "+1");
country2phone.put("UY", "+598");
country2phone.put("UZ", "+998");
country2phone.put("VU", "+678");
country2phone.put("VA", "+379");
country2phone.put("VE", "+58");
country2phone.put("VN", "+84");
country2phone.put("YE", "+967");
country2phone.put("ZM", "+260");
country2phone.put("ZW", "+263");
country2phone.put("GE", "+995");
country2phone.put("TW", "+886");
country2phone.put("AZ", "+374-97");
country2phone.put("CY", "+90-392");
country2phone.put("MD", "+373-533");
country2phone.put("SO", "+252");
country2phone.put("GE", "+995");
country2phone.put("CX", "+61");
country2phone.put("CC", "+61");
country2phone.put("NF", "+672");
country2phone.put("NC", "+687");
country2phone.put("PF", "+689");
country2phone.put("YT", "+262");
country2phone.put("GP", "+590");
country2phone.put("GP", "+590");
country2phone.put("PM", "+508");
country2phone.put("WF", "+681");
country2phone.put("CK", "+682");
country2phone.put("NU", "+683");
country2phone.put("TK", "+690");
country2phone.put("GG", "+44");
country2phone.put("IM", "+44");
country2phone.put("JE", "+44");
country2phone.put("AI", "+1-264");
country2phone.put("BM", "+1-441");
country2phone.put("IO", "+246");
country2phone.put("", "+357");
country2phone.put("VG", "+1-284");
country2phone.put("KY", "+1-345");
country2phone.put("FK", "+500");
country2phone.put("GI", "+350");
country2phone.put("MS", "+1-664");
country2phone.put("SH", "+290");
country2phone.put("TC", "+1-649");
country2phone.put("MP", "+1-670");
country2phone.put("PR", "+1-787and1-939");
country2phone.put("AS", "+1-684");
country2phone.put("GU", "+1-671");
country2phone.put("VI", "+1-340");
country2phone.put("HK", "+852");
country2phone.put("MO", "+853");
country2phone.put("FO", "+298");
country2phone.put("GL", "+299");
country2phone.put("GF", "+594");
country2phone.put("GP", "+590");
country2phone.put("MQ", "+596");
country2phone.put("RE", "+262");
country2phone.put("AX", "+358-18");
country2phone.put("AW", "+297");
country2phone.put("AN", "+599");
country2phone.put("SJ", "+47");
country2phone.put("AC", "+247");
country2phone.put("TA", "+290");
country2phone.put("CS", "+381");
country2phone.put("PS", "+970");
country2phone.put("EH", "+212");
}
}
In MainActivity, you can call the following function to get the contact list in the device.
private void getContactList(){
String ISOPrefix = getCountryISO();
Cursor phones = getContext().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null);
while (phones.moveToNext()){
String name = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phone = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
phone = phone.replace(" ","");
phone = phone.replace("-","");
phone = phone.replace("(","");
phone = phone.replace(")","");
if (!String.valueOf(phone.charAt(0)).equals("+")) {
phone = ISOPrefix + phone;
}
UserObject mContact = new UserObject("",name, phone);
contactList.add(mContact);
getUserDetails(mContact);
}
}
Here you can get the CountryISO from the device.
private String getCountryISO(){
String iso = null;
TelephonyManager telephonyManager = (TelephonyManager) getContext().getSystemService(getContext().TELEPHONY_SERVICE);
if (telephonyManager.getNetworkCountryIso() != null) {
if (!telephonyManager.getNetworkCountryIso().toString().equals("")) {
iso = telephonyManager.getNetworkCountryIso().toString();
}
}
return CountryToPhonePrefix.getPhone(iso);
}
And here you can search in Firebase Realtime Database who has an account in your app according to your contact list.
private void getUserDetails(UserObject mContact) {
DatabaseReference mUserDB = FirebaseDatabase.getInstance().getReference().child("user");
// Only lists the users that have an account in the app into Firebase
Query query = mUserDB.orderByChild("phone").equalTo(mContact.getPhone());
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
String uid, name = "", phone = "", email, image;
for (DataSnapshot childSnapshot : dataSnapshot.getChildren()){
uid = childSnapshot.getKey().toString();
if (childSnapshot.child("phone").getValue() != null) {
phone = childSnapshot.child("phone").getValue().toString();
}
if (childSnapshot.child("name").getValue() != null) {
name = childSnapshot.child("name").getValue().toString();
}
email = childSnapshot.child("email").getValue().toString();
image = childSnapshot.child("image").getValue().toString();
UserObject mUser = new UserObject(childSnapshot.getKey(), name, phone);
mUser.setImageUrl(image);
if (name.equals(phone)) {
for (UserObject mContactIterator : contactList) {
if (mContactIterator.getPhone().equals(mUser.getPhone())) {
mUser.setName(mContactIterator.getName());
}
}
}
return;
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
I hope it helps!
