android - Androidの連絡先（および詳細）の読み取りが非常に遅いようです

Question

次のコードを使用して、各連絡先とその詳細を読み取ります。

private static final String[] PROJECTION =
{
    Data._ID,
    Data.MIMETYPE,
    Data.DATA1,
    Data.DATA2,
    Data.DATA3,
    Data.DATA4,
    Data.DATA5,
    Data.DATA6,
    Data.DATA7,
    Data.DATA8,
    Data.DATA9,
    Data.DATA10,
    Data.DATA11,
    Data.DATA12,
    Data.DATA13,
    Data.DATA14,
    Data.DATA15
};    


private static final String SELECTION = Data.LOOKUP_KEY + " = ?";
private String[] mSelectionArgs = { "" };
private static final String SORT_ORDER = Data.MIMETYPE;
private static final int MIME_TYPE_INDEX = 1;
private static final int DISPLAY_NAME_INDEX = 3;//data2
private static final int GIVEN_NAME_INDEX = 3;//data2
private static final int FAMILY_NAME_INDEX = 4;//data3
private static final int MIDDLE_NAME_INDEX = 6;//data5
private static final int ORGANIZATION_INDEX = 2;//data2
private static final int PHONE_TYPE_INDEX = 3;//data2
private static final int PHONE_LABEL_INDEX = 4;//data3
private static final int PHONE_NUMBER_INDEX = 2;//data1
private static final int EMAIL_TYPE_INDEX = 3;//data2
private static final int EMAIL_LABEL_INDEX = 4;//data1
private static final int EMAIL_INDEX = 2;//data1

 private byte[] createJsonData(ArrayList<String> selected) throws JSONException, IOException{

    Log.d("SynchContactActivity", "Time 1: " + java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime()));
    int current = 0;
    final String messagePrep = getResources().getString(R.string.progress_message_prep);
    final String messageCompress = getResources().getString(R.string.progress_message_compress);
    final String messageUpload = getResources().getString(R.string.progress_message_upload);

    if(selected == null ){
        selected = getContacts();
    }

    final int count = selected.size();

    mHandler.post(new Runnable() {

        @Override
        public void run() {
            if(mProgressDialog != null){
                mProgressDialog.setMax(count);
                mProgressDialog.setMessage(messagePrep);
            }
        }
    });

    updateProgress(current);

    JSONObject root = new JSONObject();
    JSONArray contactsArray = new JSONArray();
    JSONObject contactJSON, phoneJSON, emailJSON;
    JSONArray phonesArray,emailsArray;
    String name, lastName, middleName,organization;

    for (String key : selected) {

        contactJSON = new JSONObject();
        phonesArray = new JSONArray();
        emailsArray = new JSONArray();

        mSelectionArgs[0] = key;
        //Cursor details = managedQuery(Data.CONTENT_URI, PROJECTION, SELECTION, mSelectionArgs, SORT_ORDER);
        Cursor details = getApplicationContext().getContentResolver().query(Data.CONTENT_URI, PROJECTION, SELECTION, mSelectionArgs, SORT_ORDER);

        //initialize null variables
        name = null;
        lastName = null;
        middleName = null;
        organization = null;
        while(details.moveToNext()){
            String mimeType = details.getString(MIME_TYPE_INDEX);

            if(mimeType.equals(ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE)){
                name = details.getString(GIVEN_NAME_INDEX);
                lastName = details.getString(FAMILY_NAME_INDEX);
                middleName = details.getString(MIDDLE_NAME_INDEX);

            }
            else if(mimeType.equals(ContactsContract.CommonDataKinds.Organization.CONTENT_ITEM_TYPE)){
                organization = details.getString(ORGANIZATION_INDEX);
            }               
            else if(mimeType.equals(ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE)){
                phoneJSON = new JSONObject();
                String phoneNumber = details.getString(PHONE_NUMBER_INDEX);
                int type = details.getInt(PHONE_TYPE_INDEX);
                String typeLabel = phoneTypeMap.get(String.valueOf(type));
                if (typeLabel == null) {
                    typeLabel = details.getString(PHONE_LABEL_INDEX);
                }
                phoneJSON.put("ptype", typeLabel);
                phoneJSON.put("number", phoneNumber);
                phonesArray.put(phoneJSON);
            }
            else if(mimeType.equals(ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE)){
                emailJSON = new JSONObject();
                String email = details.getString(EMAIL_INDEX);
                int type = details.getInt(EMAIL_TYPE_INDEX);
                String typeLabel = emailTypeMap.get(String.valueOf(type));
                if (typeLabel == null) {
                    typeLabel = details.getString(EMAIL_LABEL_INDEX);
                }
                emailJSON.put("etype", typeLabel);
                emailJSON.put("address",email);
                emailsArray.put(emailJSON);
            }
        }

        contactJSON.put("firstname", name==null?"null":name);
        contactJSON.put("middlename", middleName==null?"null":middleName);
        contactJSON.put("lastname", lastName==null?"null":lastName);
        contactJSON.put("organization", organization==null?"null":organization);
        contactJSON.put("phones", phonesArray);
        contactJSON.put("emails", emailsArray);
        contactsArray.put(contactJSON);
        details.close();
        ++current;
        updateProgress(current);
    }
    root.put("contacts", contactsArray);
    Log.d("SynchContactActivity", "Time 1: " + java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime()));

    mHandler.post(new Runnable() {

        @Override
        public void run() {
            if(mProgressDialog != null){
                mProgressDialog.setMessage(messageCompress);
            }
        }
    });
    // to compress
    String json_doc = root.toString();
    byte[] compressed = compress(json_doc);

    mHandler.post(new Runnable() {

        @Override
        public void run() {
            if(mProgressDialog != null){
                mProgressDialog.setMessage(messageUpload);
            }
        }
    });
    return compressed;
}

このコードは遅すぎます。平均して 1 秒あたり 3 ～ 4 件の連絡先を読み取ります。これは正常ですか、それとも最適化できますか?

プロジェクションは最適化するのに適した候補かもしれないと思いますが、よくわかりません。

前もって感謝します。