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copied!<p>I got curious too, and went looking for it in the Android source code.</p> <p>I found what seems to be the relevant code at the <code>platform/frameworks/base</code> repository, in the <code>tools/aapt/Resource.cpp</code> file. The relevant function is <code>fullyQualifyClassName</code>, called by <code>massageManifest</code>.</p> <p>The rule it applies is explained in a comment block within the <code>fullyQualifyClassName</code> function:</p> <pre><code>// asdf --> package.asdf // .asdf .a.b --> package.asdf package.a.b // asdf.adsf --> asdf.asdf </code></pre> <p>Explaining this rule, we have:</p> <ol> <li>If the name starts with a dot, always prefix it with the package.</li> <li>If the name has a dot anywhere else, do not prefix it.</li> <li>If the name has no dot at all, also prefix it with the package.</li> </ol> <p>So, to answer your question: as long as there is no dot anywhere else, both ways of writing the activity name should have the same effect.</p> <hr> <p>As an extra, the <code>massageManifest</code> function shows where this rule is applied:</p> <ul> <li>In the <code>application</code> element, on the <code>name</code> and <code>backupAgent</code> attributes.</li> <li>In the <code>activity</code>, <code>service</code>, <code>receiver</code>, <code>provider</code>, and <code>activity-alias</code> elements, on the <code>name</code> attribute.</li> <li>In the <code>activity-alias</code> element, on the <code>targetActivity</code> attribute.</li> </ul>

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