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copied!<p>The only problem with APIs < 11 is that this method is not implemented. I guess the best idea is to look into Android source code and use implementation from API >= 11. This should get you absolutely identic functionality even on older APIs.</p> <p>This one is from 4.1.1, modified to take Uri as a parameter, so you can use it right away:</p> <pre><code>/** * Returns a set of the unique names of all query parameters. Iterating * over the set will return the names in order of their first occurrence. * * @throws UnsupportedOperationException if this isn't a hierarchical URI * * @return a set of decoded names */ private Set<String> getQueryParameterNames(Uri uri) { if (uri.isOpaque()) { throw new UnsupportedOperationException("This isn't a hierarchical URI."); } String query = uri.getEncodedQuery(); if (query == null) { return Collections.emptySet(); } Set<String> names = new LinkedHashSet<String>(); int start = 0; do { int next = query.indexOf('&', start); int end = (next == -1) ? query.length() : next; int separator = query.indexOf('=', start); if (separator > end || separator == -1) { separator = end; } String name = query.substring(start, separator); names.add(Uri.decode(name)); // Move start to end of name. start = end + 1; } while (start < query.length()); return Collections.unmodifiableSet(names); } </code></pre> <p>If you want to dig into it yourself, here is the original code:</p> <p><a href="http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.1.1_r1/android/net/Uri.java?av=f">http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.1.1_r1/android/net/Uri.java?av=f</a></p>

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