title: Why does the Android NDK miss out on certain API levels?
body: <p>I've just installed the latest Android Studio and Android NDK. When examining the <code>platforms</code> directory of my NDK installation, I can see the following platforms:</p>
  
  <pre><code>android-9
  android-12
  android-13
  android-14
  android-15
  android-16
  android-17
  android-18
  android-19
  android-21
  android-22
  android-23
  android-24
  </code></pre>
  
  <p>You can see that the API levels 10, 11, 20 and 25 are missing in the NDK. So why is that?</p>
  
  <p>And what if my app should target API level 11? What should I define as <code>ANDROID_PLATFORM</code> in that case? I've tried the following and it seems to work although there is no <code>android-11</code> directory in my NDK:</p>
  
  <pre><code>externalNativeBuild {
      cmake {
          arguments '-DANDROID_PLATFORM=android-11',
                    '-DANDROID_TOOLCHAIN=clang'
      }
  }
  </code></pre>
  
  <p>Is this the right way to target API level 11? It's slightly confusing to me because it seems to work but as I said, there is no <code>android-11</code> directory in my NDK installation...</p>
  
  <p>Thanks for anybody who can shed some light onto this!</p>