gradle "universalApk true" doesn't build me an apk with all the mentioned ABIs
<p>I'm using android studio 2.1.2 and gradle 2.12, 
with the following gradle.build script:</p>

<pre><code>splits {
    abi {
        enable true
        reset()
        include 'x86', 'x86_64', 'armeabi-v7a'
        universalApk true
    }
}
</code></pre>

<p>After the build, it generates the following APKs.</p>

<ul>
<li>project-armeabi-v7a-debug-unaligned.apk</li>
<li>project-armeabi-v7a-debug.apk</li>
<li>project-universal-debug-unaligned.apk</li>
<li>project-universal-debug.apk</li>
<li>project-x86-debug-unaligned.apk</li>
<li>project-x86-debug.apk</li>
<li>project-x86_64-debug-unaligned.apk</li>
<li>project-x86_64-debug.apk</li>
</ul>

<p>However, it seems the <code>project-universal-*.apk</code> doesn't contain the x86 and x86_64 support I want. It was not able to install on my x86_64 emulator. (which the <code>project-x86_64-debug.apk</code> works well)</p>

<pre><code>$ adb install project-universal-debug.apk
[100%] /data/local/tmp/project-universal-debug.apk
    pkg: /data/local/tmp/project-universal-debug.apk
Failure [INSTALL_FAILED_NO_MATCHING_ABIS]
</code></pre>

<p>And I also check it by the <code>aapt</code> command: (not sure it's the right way)</p>

<pre><code>$aapt dump badging project-universal-debug.apk  | grep native-code
native-code: 'armeabi' 'armeabi-v7a'
</code></pre>

<p>What can I do the have the universal APK for all the ABIs from <code>include 'x86', 'x86_64', 'armeabi-v7a'</code>?</p>