Export the Contacts as VCF file

Question

I want to export the Phone contacts to External storage area. I didn\'t work with this type of method. Anyone guide me to do this?

Answer 1

Android Nougat Update :

Other answers code working for lots of people before Nougat update.

Please take care of :

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

is not working on Android Nougat.

fd.getDeclaredLength() is always return -1.

Please use below code for read bytes without any library :

byte[] buf = readBytes(fis);

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();
}

The method readBytes() get from this answer.

Answer 2

I tried above two codes and I got the .VCF file too, but it was containing only one contact. so here is Perfectly Edited and running code....you will get all contacts in .VCF file:

private void getVcardString() throws IOException {
    // TODO Auto-generated method stub
    vCard = new ArrayList<String>();  // Its global....
    cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
    if(cursor!=null&&cursor.getCount()>0)
    {
        int i;
        String storage_path = Environment.getExternalStorageDirectory().toString() + File.separator + vfile;
        FileOutputStream mFileOutputStream = new FileOutputStream(storage_path, false);
        cursor.moveToFirst();
        for(i = 0;i<cursor.getCount();i++)
        {
            get(cursor);
            Log.d("TAG", "Contact "+(i+1)+"VcF String is"+vCard.get(i));
            cursor.moveToNext();
            mFileOutputStream.write(vCard.get(i).toString().getBytes());
        }
        mFileOutputStream.close();
        cursor.close();
    }
    else
    {
        Log.d("TAG", "No Contacts in Your Phone");
    }
}

Second Method:

private void get(Cursor cursor2) {
    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 = new byte[(int) fd.getDeclaredLength()];
        fis.read(buf);
        String vcardstring= new String(buf);
        vCard.add(vcardstring);
    } catch (Exception e1) 
    {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
}

Please Don't forget to add :

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>