一个方法的应用,求解说

Parameters
pm A PackageManager from which the XML can be loaded; usually the PackageManager from which you originally retrieved this item.
name Name of the meta-date you would like to load.PackageManager 里是记录着对应apk的信息
返回的应该是package对应的xml的解析器，通过这个解析器来获取包的指定信息。