How to get all contacts and export to .vcf file?

Question

I want my application to get all contacts and export them to a .vcf file programmatically in Java. I don't know how to do it, please give me an example.

Answer 1

Try out this. It's worked for me to create a .vcf file of all contact.

make sure all permission is given properly.

package com.vcard;

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;
import android.view.View;

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.main);
        vfile = "Contacts" + "_" + System.currentTimeMillis()+".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");
          
            FileInputStream fis = fd.createInputStream();
            byte[] buf = readBytes(fis);
            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();
        }
    }

    public byte[] readBytes(InputStream inputStream) throws IOException {
         // this dynamically extends to take the bytes you read
        ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();

        // this is storage overwritten on each iteration with bytes
        int bufferSize = 1024;
        byte[] buffer = new byte[bufferSize];

        // we need to know how may bytes were read to write them to the byteBuffer
        int len = 0;
        while ((len = inputStream.read(buffer)) != -1) {
           byteBuffer.write(buffer, 0, len);
        }

        // and then we can return your byte array.
        return byteBuffer.toByteArray();
   }
}