package com.example.addressbook;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    public static final int REQUEST_READ_CONTACTS = 79;
    ListView list;
    ArrayList mobileArray;
    ArrayList numberArray;

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        numberArray = new ArrayList();
        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
            mobileArray = getAllContacts();
        } else {
            requestPermission();
        }
        list = findViewById(R.id.list);
        // uses a built-in layout that is part of the Android SDK
        ArrayAdapter adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, mobileArray);
        list.setAdapter(adapter);
        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String number = (String) numberArray.get(position);
                Toast.makeText(MainActivity.this,number,Toast.LENGTH_LONG).show();
            }
        });
    }
    private void requestPermission() {
        if (ActivityCompat.shouldShowRequestPermissionRationale(this,android.Manifest.permission.READ_CONTACTS)) {
            // show UI part if you want here to show some rationale !!!
        } else {
            ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.READ_CONTACTS},
                    REQUEST_READ_CONTACTS);
        }
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.READ_CONTACTS)) {
        } else {
            ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.READ_CONTACTS},
                    REQUEST_READ_CONTACTS);
        }
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case REQUEST_READ_CONTACTS: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    mobileArray = getAllContacts();
                } else {
                    // permission denied,Disable the
                    // functionality that depends on this permission.
                }
                return;
            }
        }
    }
    @SuppressLint("Range")
    private ArrayList getAllContacts() {
        ArrayList<String> nameList = new ArrayList<>();
        ContentResolver cr = getContentResolver();
        Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,
                null, null, null, null);
        if ((cur != null ? cur.getCount() : 0) > 0) {
            while (cur != null && cur.moveToNext()) {
                String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
                String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                nameList.add(name);

                if (cur.getInt(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)) > 0) {
                    Cursor pCur = cr.query(
                            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                            null,
                            ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
                            new String[]{id}, null);
                    while (pCur.moveToNext()) {
                        String phoneNo = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                        numberArray.add(phoneNo);

                    }
                    pCur.close();
                }
            }
        }
        if (cur != null) {
            cur.close();
        }
        return nameList;
    }
}