title: Support to 64-bit gives error on adding ndk.abiFilters in build.gradle
body: <p>Most of the android developers must have got the message from Google to update the apps to support 64-bit architecture by Aug 2019. The detailed instructions are given here:
  <a href="https://developer.android.com/distribute/best-practices/develop/64-bit" rel="noreferrer">Ensure that your app supports 64-bit devices</a></p>
  
  <p>In my app, I found that the 32-bit libs are used and therefore I have to update the app to support 64-bit architecture. As suggested in the guide above, I added the following in <code>build.gradle</code> file:</p>
  
  <pre><code>ndk.abiFilters = 'armeabi-v7a' 'arm64-v8a' 'x86' 'x86_64'
  </code></pre>
  
  <p>However, after that, I get following error in building the app:</p>
  
  <blockquote>
    <p>Error:(35, 0) Could not find method armeabi-v7a() for arguments
    [arm64-v8a] on DefaultConfig_Decorated{name=main, dimension=null,
    minSdkVersion=DefaultApiVersion{mApiLevel=16, mCodename='null'},
    targetSdkVersion=DefaultApiVersion{mApiLevel=28, mCodename='null'},
    renderscriptTargetApi=null, renderscriptSupportModeEnabled=null,
    renderscriptSupportModeBlasEnabled=null,
    renderscriptNdkModeEnabled=null, versionCode=3, versionName=1.2,
    applicationId=, testApplicationId=null,
    testInstrumentationRunner=null, testInstrumentationRunnerArguments={},
    testHandleProfiling=null, testFunctionalTest=null, signingConfig=null,
    resConfig=null, mBuildConfigFields={}, mResValues={},
    mProguardFiles=[], mConsumerProguardFiles=[],
    mManifestPlaceholders={}, mWearAppUnbundled=null} of type
    com.android.build.gradle.internal.dsl.DefaultConfig.</p>
  </blockquote>
  
  <p>Has anybody already tried updating the app to 64-bit? Any idea, how to fix this issue?</p>