Re: Re: [scala] Scalandroid

It looks like it has problems with invokespecial and super. The
following will work:

Java:

public class MyActivity extends Activity
{
     /** Called with the activity is first created. */
     @Override
     public void onCreate(Bundle icicle)
     {
         super.onCreate(icicle);
         new Sub().f(this);
     }
}

Scala:

class Foo {
   def g(a: Activity) {
     val tv = new TextView(a)
     tv.setText("Hello Android. Cheers, Scala")
     a.setContentView(tv)
   }
}

class Sub extends Foo {
   def f(a: Activity) { g(a) }
}

If I replace the call to g with an explicit super reference, i.e.,

class Sub extends Foo {
   def f(a: Activity) { super.g(a) }
}

I get a NoSuchMethodError at runtime:

E/AndroidRuntime(545): Caused by: java.lang.NoSuchMethodError: g
E/AndroidRuntime(545): at my.test.Sub.f(MyActivity.scala:26)
E/AndroidRuntime(545): at my.test.MyActivity.onCreate(MyActivity.java:14)
E/AndroidRuntime(545): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:786)
E/AndroidRuntime(545): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1367)
E/AndroidRuntime(545): ... 11 more


The only difference of the generated bytecode I can see from javap's
output is a different constant pool and that it uses invokespecial
instead of invokevirtual in f. Invokespecial is also used if I move g to
Sub and make it private, but it works that way.

Just wanted to share my results. Anyone else playing with it?

Ingo


Matt Hellige wrote: