package com.mygmer.contactstest;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.ArrayList;

import android.app.Activity;

import android.content.res.AssetFileDescriptor;

import android.database.Cursor;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.provider.ContactsContract;

import android.util.Log;

public class VCardActivity extends Activity {

    Cursor cursor;

    ArrayList<String> vCard;

    String vfile;

    /**

     * Called when the activity is first created.

     */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        vfile = "Contacts" + "_" + "mfTest" + ".vcf";

        /**This Function For Vcard And here i take one Array List in Which i store every Vcard String of Every Conatact

         * Here i take one Cursor and this cursor is not null and its count>0 than i repeat one loop up to cursor.getcount() means Up to number of phone contacts.

         * And in Every Loop i can make vcard string and store in Array list which i declared as a Global.

         * And in Every Loop i move cursor next and print log in logcat.

         * */

        getVcardString();

    }

    private void getVcardString() {

        // TODO Auto-generated method stub

        vCard = new ArrayList<String>();

        cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);

        if (cursor != null && cursor.getCount() > 0) {

            cursor.moveToFirst();

            for (int i = 0; i < cursor.getCount(); i++) {

                get(cursor);

                Log.d("TAG", "Contact " + (i + 1) + "VcF String is" + vCard.get(i));

                cursor.moveToNext();

            }

        } else {

            Log.d("TAG", "No Contacts in Your Phone");

        }

    }

    public void get(Cursor cursor) {

        //cursor.moveToFirst();

        String lookupKey = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY));

        Uri uri = Uri.withAppendedPath(ContactsContract.Contacts.CONTENT_VCARD_URI, lookupKey);

        AssetFileDescriptor fd;

        try {

            fd = this.getContentResolver().openAssetFileDescriptor(uri, "r");

            // Your Complex Code and you used function without loop so how can you get all Contacts Vcard.??

           /* FileInputStream fis = fd.createInputStream();

            byte[] buf = new byte[(int) fd.getDeclaredLength()];

            fis.read(buf);

            String VCard = new String(buf);

            String path = Environment.getExternalStorageDirectory().toString() + File.separator + vfile;

            FileOutputStream out = new FileOutputStream(path);

            out.write(VCard.toString().getBytes());

            Log.d("Vcard",  VCard);*/

            FileInputStream fis = fd.createInputStream();

            byte[] buf = new byte[(int) fd.getDeclaredLength()];

            fis.read(buf);

            String vcardstring = new String(buf);

            vCard.add(vcardstring);

            String storage_path = Environment.getExternalStorageDirectory().toString() + File.separator + vfile;

            FileOutputStream mFileOutputStream = new FileOutputStream(storage_path, false);

            mFileOutputStream.write(vcardstring.toString().getBytes());

        } catch (Exception e1) {

            // TODO Auto-generated catch block

            e1.printStackTrace();

        }

    }

}

Intent intent = new Intent(Intent.ACTION_VIEW);

intent.setDataAndType(Uri.fromFile(new File("/storage/sdcard0/contacts_20180106150125.vcf")),"text/x-vcard");

startActivity(intent);

 /**

     * Activity Action: Display the data to the user.  This is the most common

     * action performed on data -- it is the generic action you can use on

     * a piece of data to get the most reasonable thing to occur.  For example,

     * when used on a contacts entry it will view the entry; when used on a

     * mailto: URI it will bring up a compose window filled with the information

     * supplied by the URI; when used with a tel: URI it will invoke the

     * dialer.

     * <p>Input: {@link #getData} is URI from which to retrieve data.

     * <p>Output: nothing.

     */