public abstract class Bla
{
    // Constructor
    public Bla()
    {
        Log.d( "myapp", "note 1.1.1" );
    }

    // ...

    abstract void apply( SpannableString s );
}

public class Bla1 extends Bla
{
    // Constructor
    public Bla1()
    {
        Log.d( "myapp", "note 1.1" );
    }

    // ...

    void apply( SpannableString s )
    {
        // ...
    }
}