android显示自己的应用程序图标联系

Question

在我的android项目中，我想将我的应用程序图标调用功能显示到android联系信息中。在这张图片中whatsapp如何显示那里的图标。

所以，我使用以下代码： -

private static final IM_LABEL = "Test protocol";
 private static final LOG_TAG = "Log"
    /**
 * This method add my account under IM field at default Contact
 * application
 * 
 * Labeled with my custom protocol.
 * 
 * @param contentResolver
 *            content resolver
 * @param uid
 *            User id from android
 * @param account
 *            account name
 */
public static void updateIMContactField(ContentResolver contentResolver,
        String uid, String account) {

    ContentValues contentValues = new ContentValues();

    contentValues.put(ContactsContract.Data.RAW_CONTACT_ID,
            Integer.parseInt(uid));
    contentValues.put(ContactsContract.Data.MIMETYPE,
            ContactsContract.CommonDataKinds.Im.CONTENT_ITEM_TYPE);
    contentValues.put(ContactsContract.CommonDataKinds.Im.TYPE,
            ContactsContract.CommonDataKinds.Im.TYPE_CUSTOM);
    contentValues.put(ContactsContract.CommonDataKinds.Im.LABEL, IM_LABEL);
    contentValues.put(ContactsContract.CommonDataKinds.Im.PROTOCOL,
            ContactsContract.CommonDataKinds.Im.PROTOCOL_CUSTOM);
    contentValues.put(ContactsContract.CommonDataKinds.Im.CUSTOM_PROTOCOL,
            IM_LABEL);

    contentValues.put(ContactsContract.CommonDataKinds.Im.DATA, account);

    ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>();
    ops.add(ContentProviderOperation
            .newInsert(ContactsContract.Data.CONTENT_URI)
            .withValues(contentValues).build());

    try {
        contentResolver.applyBatch(ContactsContract.AUTHORITY, ops);
    } catch (Exception e) {
        Log.d(LOG_TAG, "Can't update Contact's IM field.");
    }
}

/**
 * This method remove IM entry at default Contact application.
 * 
 * @param contentResolver
 *            content resolver
 * @param uid
 *            User id from android
 * @param account
 *            account name
 */
public static void removeIMContactField(ContentResolver contentResolver,
        String uid, String account) {
    ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>();

    ops.add(ContentProviderOperation
            .newDelete(Data.CONTENT_URI)
            .withSelection(
                    ContactsContract.Data.RAW_CONTACT_ID + "=? and "
                            + ContactsContract.Data.MIMETYPE + "=? and "
                            + ContactsContract.CommonDataKinds.Im.DATA
                            + " = ?",
                    new String[] {
                            String.valueOf(uid),
                            ContactsContract.CommonDataKinds.Im.CONTENT_ITEM_TYPE,
                            account }).build());

    try {
        contentResolver.applyBatch(ContactsContract.AUTHORITY, ops);
    } catch (Exception e) {
        Log.d(LOG_TAG, "Can't delete Contact's IM field.");
    }
}

/**
 * This method remove IM all entries at default Contact application 
 * 
 * @param contentResolver
 *            content resolver
 */
public static void deleteAllIMContactField(ContentResolver contentResolver) {
    ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>();

    ops.add(ContentProviderOperation
            .newDelete(Data.CONTENT_URI)
            .withSelection(
                    ContactsContract.Data.MIMETYPE
                            + "= ? and "
                            + ContactsContract.CommonDataKinds.Im.CUSTOM_PROTOCOL
                            + "= ?",
                    new String[] {
                            ContactsContract.CommonDataKinds.Im.CONTENT_ITEM_TYPE,
                            IM_LABEL }).build());

    try {
        contentResolver.applyBatch(ContactsContract.AUTHORITY, ops);
    } catch (Exception e) {
        Log.d(LOG_TAG,
                "An exception occurred when deleting all IM field of Contact.");
    }
}

现在我的问题是，我可以添加多少字段......是否存在任何限制？是否只是实现此要求的过程？