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copied!<p>Curious, this behavior does not seem to be universally true. I can run a simple example in the emulator or on one of my Nexus devices and the application has no problem inflating a main layout with the <code><merge></code> tag as the root of the hierarchy. Can you reproduce this on multiple devices?</p> <p>Technically, just from a glance at the AOSP, this behavior is not possible with the Android <code>Window</code> and <code>Activity</code> implementation unless a particular OEM has modified its behavior (Motorola is notorious for doing this). In the AOSP source:</p> <ol> <li>The exception can only come about when <code>LayoutInflater.inflate()</code> is called with a <code>null</code> parent view parameter.</li> <li><code>Activity</code> just passes <code>setContentView()</code> off to its parent <code>Window</code></li> <li><code>Window</code> calls <code>LayoutInflater.inflate()</code> with the content view as the parent, and if it were null at this stage a nasty <code>RuntimeException</code> would have been thrown by the framework code.</li> </ol> <p>As a side note, this may not be something you want to do anyway. I understand the reason for wanting to replace a seemingly useless parent in your hierarchy, but one thing that guarantees is that your application always knows what its parent is so it can properly expect <code>LayoutParams</code> to be evaluated. When using <code><merge></code>, the root content view of your hierarchy could be a <code>FrameLayout</code>, <code>LinearLayout</code>, or other depending on the version of Android on the device, and this may cause confusing behavior if you expect root <code>LayoutParams</code> to behave in a specific way.</p>

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