如何查看ContactsContract是否有照片

Question

我能够获取我的所有联系人并将其显示在列表视图中。我也得到了隐形眼镜的照片。我的问题是，如果联系人没有照片，我的列表视图不会显示任何内容(空白)。我试着在某个地方查看ContactsContract.CommonDataKinds.Phone.PHOTO_THUMBNAIL_URI是否有照片，但我找不到方法。

在简历中，我想要是，如果联系人有照片显示照片，如果没有，则显示一个图标。

任何帮助都将被感谢！

代码：

private final static String[] FROM_COLUMNS = {
            ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
            ContactsContract.CommonDataKinds.Phone.NUMBER,
            ContactsContract.CommonDataKinds.Phone.PHOTO_THUMBNAIL_URI
    };
    private final static int[] TO_IDS = {
            R.id.contactName,
            R.id.message_subtitle,
            R.id.contact_imageview
    };
    private static final String[] PROJECTION = {
            ContactsContract.CommonDataKinds.Phone._ID,
            ContactsContract.CommonDataKinds.Phone.CONTACT_ID,
            ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
            ContactsContract.CommonDataKinds.Phone.NUMBER,
            ContactsContract.CommonDataKinds.Phone.PHOTO_THUMBNAIL_URI
    };

    private static final String SELECTION = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " LIKE ?";
    private String[] mSelectionArgs = {"%%"};

    private ListView mContactsList;
    private SimpleCursorAdapter mCursorAdapter;

    public contacts() {
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.contacts_list_fragment, container, false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mContactsList = (ListView) getActivity().findViewById(R.id.contacts_list);
        mCursorAdapter = new SimpleCursorAdapter(getActivity(), R.layout.list_item, null, FROM_COLUMNS, TO_IDS, 0);
        mContactsList.setOnItemClickListener(this);
        mContactsList.setAdapter(mCursorAdapter);
        getLoaderManager().initLoader(0, null, this);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        return new CursorLoader(getActivity(), ContactsContract.CommonDataKinds.Phone.CONTENT_URI, PROJECTION, SELECTION, mSelectionArgs,
                ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME+" ASC");
    }