Java API documentation, offline on Android

The Java SE API reference, every package, class, method and field, on your phone and searchable without internet. About 83 MB to download, then it never needs a connection again.

Get it on Google Play See example entries

What is in the Java docset

This is the Java SE API reference: the same Javadoc you would browse online, packaged as a docset. Methods are listed with their parameter types, so overloads such as groupingBy(Function) and groupingBy(Function, Collector) are separate results you can tell apart before opening them.

With almost 60,000 entries, Java is one of the larger docsets, and this is where a local index pays off: results come from the copy on your phone, not from a server.

Version: SE 27
Entries: 59,956
Download: 82.7 MB
Source: Official docset feed

Entry types: Method 39,398 · Field 7,245 · Constructor 5,018 · Class 3,322 · Interface 1,656 · Package 757. Figures from the docset's own index, checked on 27 October 2026; versions change as the feeds update. Download size is the compressed archive.

Illustration with real entries from the Java docset.

Example entries you can search offline

A few real entries from the Java docset's index, as they appear in search results:

Entry	Type
HashMap<K,V>	Class
CompletableFuture<T>	Class
Optional<T>	Class
Collectors	Class
groupingBy(Function)	Method
ofVirtual()	Method
LocalDate	Class
HttpClient	Class
Files	Class
java.util.stream	Package

How to get the Java documentation offline

Install DevDocs from Google Play. It is free and needs no account.
Open the Store tab and search for Java.
Tap Download. The docset downloads in the background (82.7 MB compressed) and is indexed on your phone.
Open Search or the docset in your Library. From now on it works with no connection.

Tips for searching the Java docs

Search a method name followed by ( to see every overload, for example groupingBy(.
Search a package name such as java.util.concurrent to open its package summary.
Install Kotlin and Android (Kotlin) alongside Java if you work on Android; search covers every installed docset at once.

Related docsets

Also in the DevDocs Store: Spring Framework, Groovy JDK, Gradle Java API, OpenCV Java, Play Java. Install any of them and one search covers them all. See also: Kotlin documentation offline and Android documentation offline.

Java docs offline: questions

Which Java version is it?

The official feed currently publishes Java SE 27. DevDocs offers updates when the feed publishes a newer version.

Can I download Java documentation for offline use on a phone?

Yes. Install DevDocs, open the Store, search for Java and tap Download. After the 83 MB download the whole API reference works offline.

Does it include Spring or other libraries?

Not in the Java docset itself, but Spring Framework, Groovy JDK, the Gradle Java API and OpenCV Java are separate docsets in the same Store.

Get the Java docs on your phone

DevDocs is free, has no ads and needs no account.

Get it on Google Play