title: Android proguard error com.google.ads.util.i: and setMediaPlaybackRequiresUserGesture(boolean)
body: <p>I am trying to create an APK file, but when I press Finish on the export dialog, I got error, and APK is not created.
  Cannot find anything on the net so far, maybe here someone can help?
  Error:</p>
  
  <pre><code>Proguard returned with error code 1. See console
  Warning: com.google.ads.util.i: can't find referenced method 'void setMediaPlaybackRequiresUserGesture(boolean)' in class android.webkit.WebSettings
        You should check if you need to specify additional program jars.
  Warning: there were 1 unresolved references to program class members.
           Your input classes appear to be inconsistent.
           You may need to recompile them and try again.
           Alternatively, you may have to specify the option 
           '-dontskipnonpubliclibraryclassmembers'.
  java.io.IOException: Please correct the above warnings first.
      at proguard.Initializer.execute(Initializer.java:321)
      at proguard.ProGuard.initialize(ProGuard.java:211)
      at proguard.ProGuard.execute(ProGuard.java:86)
      at proguard.ProGuard.main(ProGuard.java:492)
  </code></pre>
  
  <p>I tried to add</p>
  
  <pre><code>-dontskipnonpubliclibraryclassmembers
  </code></pre>
  
  <p>but did not help.
  I am using Ads, this is a normal android App, works fine in the emulator.</p>
  
  <p>My proguard.config is the default empty</p>
  
  <pre><code># To enable ProGuard in your project, edit project.properties
  # to define the proguard.config property as described in that file.
  #
  # Add project specific ProGuard rules here.
  # By default, the flags in this file are appended to flags specified
  # in ${sdk.dir}/tools/proguard/proguard-android.txt
  # You can edit the include path and order by changing the ProGuard
  # include property in project.properties.
  #
  # For more details, see
  #   http://developer.android.com/guide/developing/tools/proguard.html
  
  # Add any project specific keep options here:
  
  # If your project uses WebView with JS, uncomment the following
  # and specify the fully qualified class name to the JavaScript interface
  # class:
  #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
  #   public *;
  #}
  </code></pre>
  
  <p>And my project.properties:</p>
  
  <pre><code># This file is automatically generated by Android Tools.
  # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
  #
  # This file must be checked in Version Control Systems.
  # 
  # To customize properties used by the Ant build system edit
  # "ant.properties", and override values to adapt the script to your
  # project structure.
  #
  # To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
  proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
  
  # Project target.
  target=android-16  
  </code></pre>
  
  <p>Thanks</p>
  
  <p>ps: are these default android proguard settings safe enough to prevent basic "hacking"?
  (If I can make it workable)</p>