Question

I am searching a way to do this :

public class SimpleText_SpinnerAdapter extends ArrayAdapter<Enum1> {
   many lines of code with a one moment : String val = oneEnum1val_inparam.getlabel();
}

public class SimpleText_SpinnerAdapter extends ArrayAdapter<Enum2> {
   exactly the same code than previously, but for Enum2
}

public class SimpleText_SpinnerAdapter extends ArrayAdapter<Enum3> {
   exactly the same code than previously, but for Enum3
}

This is made to have 3 adapters for 3 spinners, that contains values from 3 differents Enums constructed exactly the same way but with different values.

Of course, each enum type has a getLabel() method.

I’d like to find a way to do this without needing to copy-paste 3 times the same code for each adapter. A sort of generic one, that could be referenced by 3 specialized one.

I don’t find the solution.
Could you help me to do this ?

Or if you have somthing more efficient…

Oliver

Answer 1

How about:

public class SimpleText_SpinnerAdapter<T extends Enum<T> & ProvidesLabel>
    extends ArrayAdapter<T>
{
    // implementation
}



public enum Enum1 implements ProvidesLabel
{
        Entry1("label 1"),
        Entry2("label 2");

    private final String label;

    private Enum1(String label)
    {
        this.label = label;
    }

    @Override 
    public String getLabel()
    {
        return this.label;
    }
}

public interface ProvidesLabel
{
    String getLabel();
}

Instantiate class with (nm the constructor):

 SimpleText_SpinnerAdapter<Enum1> enum1 =
        new SimpleText_SpinnerAdapter<Enum1>(context, textViewResourceId);