Read Phone Contacts Example in Android

MainActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.bhaumik.readcontectdemo.MainActivity">

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

item_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

        <TextView
            android:id="@+id/text_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="50dp"
            android:text="Text Name"
            android:layout_marginTop="20dp"
            android:textSize="16dp"
            android:textStyle="bold" />


    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="50dp"
        android:text="Hello"
        android:layout_marginTop="20dp"
        android:textStyle="bold" />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#000"
        android:layout_marginTop="10dp"/>
</LinearLayout>

ContactData.java

package com.example.bhaumik.readcontectdemo;

/**
 * Created by Bhaumik on 9/6/2017.
 */

public class ContactData {

    String name,number;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }
}

MainActivity.java

package com.example.bhaumik.readcontectdemo;

import android.Manifest;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Build;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    ListView listView;
    ContactData contactData;
    List<ContactData> list = new ArrayList<>();

    ContactAdapter adapter;

    int counter;

    private static final int REQUEST_CODE = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.list_view);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
            requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_CODE);

        }else{

            getContacts();

        }

    }

    private void getContacts() {
        Cursor cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                null,null,null,ContactsContract.CommonDataKinds.Phone.NUMBER);

        if(cursor.getCount()>0){
            counter =0;
            while (cursor.moveToNext()){

                String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME ));
                String phone = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                contactData = new ContactData();

                contactData.setName(name);
                contactData.setNumber(phone);

                list.add(contactData);
            }

            adapter = new ContactAdapter(MainActivity.this,R.layout.item_list,list);
            listView.setAdapter(adapter);


        }
        cursor.close();

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

        if (requestCode == REQUEST_CODE) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission is granted
                getContacts();
            } else {
                Toast.makeText(this, "Permission Cancel.", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

ContactAdapter.java

package com.example.bhaumik.readcontectdemo;

import android.content.Context;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.amulyakhare.textdrawable.TextDrawable;
import com.amulyakhare.textdrawable.util.ColorGenerator;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Bhaumik on 9/6/2017.
 */

public class ContactAdapter extends ArrayAdapter<ContactData>{

    Context context;
    List<ContactData> list = new ArrayList<>();

    public ContactAdapter(@NonNull Context context, @LayoutRes int resource,List<ContactData> list) {
        super(context, resource,list);

        this.context = context;
        this.list = list;

    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Nullable
    @Override
    public ContactData getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        ViewHolder viewHolder;

        if (convertView == null){

            viewHolder = new ViewHolder();

            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.item_list,parent,false);
            viewHolder.name = convertView.findViewById(R.id.text_name);
            viewHolder.number = convertView.findViewById(R.id.text_view);
            convertView.setTag(viewHolder);
        }else {
            viewHolder = (ViewHolder) convertView.getTag();
        }


        viewHolder.name.setText(list.get(position).getName());
        viewHolder.number.setText(list.get(position).getNumber());

        return convertView;
    }

    public class ViewHolder{
        TextView name,number;
    }

}