Android determines whether a contact exists based on the number.

The contact storage includes two locations: SIM card and mobile phone. You must determine the contact storage space during the search process.

The mobile phone is stored in/data/COM/Android. providers. Contacts/databases.

1. Determine whether the data is stored on the mobile phone (calldetailactivity)

                    Uri personUri = null;
                    Uri phoneUri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI,
                            Uri.encode(mNumber));
                    Cursor phonesCursor = resolver.query(phoneUri, PHONES_PROJECTION, null, null, null);
try {
if (phonesCursor != null && phonesCursor.moveToFirst()) {
long personId = phonesCursor.getLong(COLUMN_INDEX_ID);
                            personUri = ContentUris.withAppendedId(
                                    Contacts.CONTENT_URI, personId);
                            callText = getString(R.string.recentCalls_callNumber,
                                    phonesCursor.getString(COLUMN_INDEX_NAME));
                            mNumber = PhoneNumberUtils.formatNumber(
                                    phonesCursor.getString(COLUMN_INDEX_NUMBER));
                            callLabel = Phone.getDisplayLabel(this,
                                    phonesCursor.getInt(COLUMN_INDEX_TYPE),
                                    phonesCursor.getString(COLUMN_INDEX_LABEL)).toString();
                        } else {
                            mNumber = PhoneNumberUtils.formatNumber(mNumber);
                        }
                    } finally {
if (phonesCursor != null) phonesCursor.close();
                    }

You can also search in the following ways:

Cursor cursor = This. getcontentresolver (). Query (
Contactscontract. commondatakinds. Phone. content_uri,
Projection, // return Field
Contactscontract. commondatakinds. Phone. Number + "= '" + mnumber + "'",//
Null, // where clause value substitution
Null); // sort order.

Android rawcontact Data Query

2. Determine whether the SIM card exists (calldetailactivity)

                        Cursor simCursor=null;
                        String[] SIM_CONTENT_PROJECTION = new String[] {
                                "name", "number", };
boolean hasIccCard1 = ((TelephonyManager) this .getSystemService(
                                PhoneFactory.getServiceName(Context.TELEPHONY_SERVICE, 0))).hasIccCard();

if(hasIccCard1){
                            simCursor = resolver.query(EditSimCardActivity.SIM1_URI,SIM_CONTENT_PROJECTION, null, null, null);
try {
if (simCursor != null) {
if (simCursor.moveToFirst()) {
do {
                                            String tempName = simCursor.getString(0);
                                            String tempNumber = simCursor.getString(1);
if (mNumber.equals(tempNumber)) {
                                                hasFoundContact=true;
                                                simContactIntent=new Intent();
                                                simContactIntent.setClass(this, ViewSimCardContactActivity.class);
                                                simContactIntent.putExtra(EditSimCardActivity.SIM_CONTACT_NAME, tempName);
                                                simContactIntent.putExtra(EditSimCardActivity.SIM_CONTACT_NUMBER, tempNumber);
                                                simContactIntent.putExtra(EditSimCardActivity.SIM_ADDRESS, EditSimCardActivity.SIM1_ADDRESS);
                                                callText = getString(R.string.recentCalls_callNumber,tempName);
                                                mNumber = PhoneNumberUtils.formatNumber(tempNumber);
break;
                                            }
                                        } while (simCursor.moveToNext());
                                    }
                                    simCursor.close();
                                }
                            } finally {
if (simCursor != null) simCursor.close();
                            }
                        }

3. Open the contact details page (calldetailactivity)

                    if (personUri != null) { //phone
                        Intent viewIntent = new Intent(Intent.ACTION_VIEW, personUri);
                        actions.add(new ViewEntry(R.drawable.sym_action_view_contact,
                                getString(R.string.menu_viewContact), viewIntent));
                    } else if (simContactIntent != null) { //sim
                        actions.add(new ViewEntry(R.drawable.sym_action_view_contact,
                                getString(R.string.menu_viewContact), simContactIntent));
                    } else { // none
                        Intent createIntent = new Intent(Intent.ACTION_INSERT_OR_EDIT);
                        createIntent.setType(Contacts.CONTENT_ITEM_TYPE);
                        createIntent.putExtra(Insert.PHONE, mNumber);
                        actions.add(new ViewEntry(R.drawable.sym_action_add,
                                getString(R.string.recentCalls_addToContact), createIntent));
                    }