Nothing more that a proof of concept, this is a basic Android activity written in Ceylon (uses the new syntax for Java interop static inner class/fields of Ceylon 1.0.0). Works with and Android SDK 19.

androidactivity.ceylon

import android.app { Activity }
import android.os { Bundle }
import android.view { Menu }
import android.widget { TextView }
import java.lang { JString=String } 

shared class Foo()  extends Activity() {

	 shared actual void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState); 
		setContentView(R.\Ilayout.activity_main);   
		assert (is TextView textView = findViewById(R.\Iid.foo));  
		textView.text = JString("Hello World !"); 
		 
	}  
 
	shared actual Boolean onCreateOptionsMenu(Menu menu) {
		menuInflater.inflate(R.\Imenu.main, menu);
		return true;
	}          
       
}