要研究一下联系人App通过Data Ability对外暴露的添加联系人接口是如何定义的。以下是访问内置照片App的相关代码，供参考：

dataAbilityHelper = DataAbilityHelper.creator(this);

try {

resultSet = dataAbilityHelper.query(AVStorage.Images.Media.EXTERNAL_DATA_ABILITY_URI,

new String[]{AVStorage.Images.Media.ID}, null);

if (resultSet != null) {

while (resultSet.goToNextRow()) {

int mediaId = resultSet.getInt(resultSet.getColumnIndexForName(AVStorage.Images.Media.ID));

Uri uri = DataUriUtils.attachId(AVStorage.Images.Media.EXTERNAL_DATA_ABILITY_URI, mediaId);

FileDescriptor fileDescriptor = dataAbilityHelper.openFile(uri, "r");

ImageSource imageSource = ImageSource.create(fileDescriptor, null);

ImageSource.DecodingOptions decodingOpts = new ImageSource.DecodingOptions();

decodingOpts.desiredSize = new Size(300, 300);

PixelMap pixelMap = imageSource.createThumbnailPixelmap(decodingOpts, true);