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When a layout is not explicity declared, what is the default layout for an Activity?
public class HelloWorld extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.helloworld);
    }

}

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="@string/hello"/>

void     setContentView(int layoutResID)
Set the activity content from a layout resource.

void     setContentView(View view)
Set the activity content to an explicit view.

void     setContentView(View view, ViewGroup.LayoutParams params)
Set the activity content to an explicit view.