Cast Image64 to ImageView Android

App.java

//IMG: JVBERi0xLjMKJf////8KMSAwIG9iago8PCAvQ3JlYXRvciA8ZmVmZjAwNTAwMDcyMDA2MTAwNzcwMDZlPgo....


//Java Code:

public class RapportiniActivity extends Fragment {


    private View view;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        view = (View) inflater.inflate(R.layout.activity_rapportini, container, false);
        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        //Do all things which you want to implement //enter code here

        final Button btnGeneraRapportino = (Button)view.findViewById(R.id.buttongenera_rapportino);
        final ImageView img= (ImageView)view.findViewById(R.id.ImageView_Rapportino);

        //Configuro la funzione Listener sul login button
        btnGeneraRapportino.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                Rapportino r=new Rapportino();
                String ImageBase64=r.GeneraRapportinoPrivato("prova");
                byte[] decodedString = Base64.decode(ImageBase64, Base64.DEFAULT);
                Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
                img.setImageBitmap(decodedByte);
            }
        });


    }


}


//XML CODE:

<ImageView
        android:id="@+id/ImageView_Rapportino"
        android:layout_width="200dp"
        android:layout_height="300dp"
        android:layout_marginLeft="100dp"
        android:layout_marginTop="100dp"
        android:src="#222"
        />