The official Google Custom Search library in Java language allows API integration to build customized search engines in websites, blogs, and groups of websites. Resources available include examples to make calls, authenticate, upload media, download media, and work with Google App Engine. To specify, this Java library in beta stage runs on Android 1.5+.
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Google announced the Firebase App Indexing API. The API allows users to search for content within the Google app and find personal or public content across apps installed on a particular device. Because the content is stored on the device, the API is functional whether a user is online or not.