package com.example.contactscontentprovider;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;

public class MainActivity extends AppCompatActivity {
    Button btnFetch;
    ListView listContacts;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnFetch = findViewById(R.id.btnFetch);
        listContacts = findViewById(R.id.listContacts);

        btnFetch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getPhoneContacts();
            }
        });
    }

    private void getPhoneContacts() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{
                    Manifest.permission.READ_CONTACTS
            }, 0);
        }

        ContentResolver contentResolver = getContentResolver();
        Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
        Cursor cursor = contentResolver.query(uri, null, null, null, null);

        String[] contactsName = new String[cursor.getCount()];
        String[] contactsNumber = new String[cursor.getCount()];

        if (cursor.getCount() > 0) {
            int i = 0, j = 0;
            while (cursor.moveToNext()) {
                String contactName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                String contactNumber = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                contactsName[i++] = contactName;
                contactsNumber[j++] = contactNumber;
            }
            MyAdapter adapter = new MyAdapter(this, contactsName, contactsNumber);
            listContacts.setAdapter(adapter);
        }
    }
}