public class MainActivity extends AppCompatActivity {



    RecyclerView recyclerView1;
    RecyclerView.Adapter rvAdapter;
    RecyclerView.LayoutManager rvLayoutManager1;


    static SharedPreferences prefs;
    static SharedPreferences.Editor prefsEditor;

    static ArrayList<String> itemTexte;
    static ArrayList<Integer> itemFotoIDs;

    static Integer listSize;
    static String itemNewString;


    static TextView textView;

    Button btn_add;
    EditText editText;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        itemTexte = new ArrayList<>();
        itemFotoIDs = new ArrayList<>();


        itemFotoIDs.addAll((Arrays.asList(R.drawable.ic_grade_black_24dp)));


        recyclerView1 = (RecyclerView) findViewById(R.id.recyclerView1);
        rvLayoutManager1 = new LinearLayoutManager(this);
        recyclerView1.setLayoutManager(rvLayoutManager1);

        rvAdapter = new rvAdapterClass();
        recyclerView1.setAdapter(rvAdapter);

        textView = (TextView) findViewById(R.id.textView);

        leseListe();
        add_Items_setup();

    }

    public void add_Items_setup() {
        btn_add = (Button) findViewById(R.id.button_add);
        editText = (EditText) findViewById(R.id.editText_add);


        btn_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (editText.getText().length() > 0) {

                    itemTexte.add(editText.getText().toString());
                    speichereListe();
                    itemFotoIDs.add(R.drawable.ic_grade_black_24dp);
                    rvAdapter.notifyDataSetChanged();
                    editText.setText(null);
                    recyclerView1.smoothScrollToPosition(itemTexte.size());
                }
            }
        });


    }

    public static void speichereListe() {

        listSize = itemTexte.size();
        Integer positionNumber = 0;
        prefsEditor.putInt("key_listSize", listSize);

        do {
            prefsEditor.putString("key_item_"+positionNumber,
                    itemTexte.get(positionNumber));
            prefsEditor.commit();
            positionNumber++;
        } while (positionNumber < listSize);

    }

    private static void leseListe() {
        listSize = prefs.getInt("key_listSize", 0);
        Integer positionNumber = 0;

        do {
            itemNewString = prefs.getString("key_item_" + positionNumber, "Item1");
            itemTexte.add(itemNewString);
            positionNumber++;
        } while (positionNumber < listSize);

    }

}





public class rvAdapterClass extends RecyclerView.Adapter<rvAdapterClass.ViewHolderClass> {

    public class ViewHolderClass extends RecyclerView.ViewHolder{

        TextView itemTextView;
        ImageView itemImageView;

        public ViewHolderClass(View itemView) {

            super(itemView);

            itemTextView = (TextView) itemView.findViewById(R.id.textViewItem);
            itemImageView = (ImageView) itemView.findViewById(R.id.imageViewItem);


        }
    }

    @Override
    public ViewHolderClass onCreateViewHolder(ViewGroup viewGroup, int viewType) {

       View itemView1 = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_layout1, null);

        return new ViewHolderClass(itemView1);
    }

    @Override
    public void onBindViewHolder(ViewHolderClass ViewHolderClass, final int i) {

        ViewHolderClass.itemTextView.setText(MainActivity.itemTexte.get(i));
        ViewHolderClass.itemImageView.setImageResource(MainActivity.itemFotoIDs.get(i));


        ViewHolderClass.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                MainActivity.textView.setText(MainActivity.itemTexte.get(i));
            }
        });

        ViewHolderClass.itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {

                MainActivity.itemTexte.remove(i);
                MainActivity.itemFotoIDs.remove(i);
                notifyDataSetChanged();
                MainActivity.speichereListe();

                return false;
            }
        });
    }

    @Override
    public int getItemCount() {
        return MainActivity.itemTexte.size();
    }
}