WidgetDemoproguard-project.md

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, click here

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 *;
}