I announced OpenJDK for Android release in the last week.
But, Java applet is not available because OpenJDK has no Java applet plugin.
Instead, IcedTea-Web is a Java applet plugin for OpenJDK.
I finally ported the IcedTea-Web with the OpenJDK.
Now, you find Java applet is available in Firefox in Android device.
Let's try Firefox and OpenJDK for AndroPorts.
Available on Google Play: