Contact List :- GetContact List from default contact database in Android

public ArrayList<String> getPhoneNumber(Activity mActivity)

{

        ArrayList<String> numbers=null;

        numbers= new ArrayList<String>();

        Cursor c =  mActivity.managedQuery(ContactsContract.Contacts.CONTENT_URI,  null, null, null, null);

        for(int i=0;i<c.getcount();i++)

        {

            c.moveToPosition(i);

            String id = c.getString(c.getColumnIndexOrThrow(ContactsContract.Contacts._ID));

            String hasPhone = c.getString(c.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));

            if (hasPhone.equalsIgnoreCase("1"))

            {

                Cursor phones = mActivity.getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,

                                                            null,ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ id,null, null);

                if(phones.getCount()>0)

                {

                     phones.moveToFirst();

                     String cNumber = phones.getString(phones.getColumnIndex("data1"));

                     numbers.add(cNumber);

                }

            }

        }

        return numbers;

    }

Note:
Add Permission in Menifest.xml
<'uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.READ_CONTACTS"/>