Use Android SDK Documentation offline in Android Studio

Find your configuration files

Windows: %USERPROFILE%\.<CONFIGURATION_FOLDER>/
Mac: ~/Library/Preferences/<CONFIGURATION_FOLDER>/
Linux: ~/.<CONFIGURATION_FOLDER>/

File is located at “Android Studio Configuration folder”/config/options/jdk.table.xml

find javadocPath

...
<jdk version="2">
  <name value="Android API 25 Platform" />
  <type value="Android SDK" />
  <homePath value="$USER_HOME$/android-sdk" />
  <roots>
      ...
    <javadocPath>
      <root type="composite">
        <root type="simple" url="http://developer.android.com/reference/" />
      </root>
    </javadocPath>
      ...

  <root type="simple" url="file:///home/mauricio/android-sdk/docs/reference" />
  <!-- if it's Windows -->
  <root type="simple" url="file://C:/android-sdk/docs/reference" />

References
https://stackoverflow.com/questions/42893969/how-to-use-android-sdk-documentation-offline