javikin

public interface OnClickListener {
    void onClick(View v);
}

javikin

button.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        Toast.makeText(v.getContext(), "Yellow", Toast.LENGTH_SHORT).show();
    }
});

javikin

public class MainActivity extends Activity implements OnClickListener {
    ...
        
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        button.setOnClickListener(this);
    }
    
    public void onClick(View v) {

javikin

button.setOnClickListener ({v -> Toast.makeText(v.context, "Yellow", Toast.LENGTH_SHORT).show() })

javikin

fun String.shortToast() {
    Toast.makeText(App.context(), this, Toast.LENGTH_SHORT).show()
}

javikin

button.setOnClickListener { "Click".shortToast() }

javikin

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

    ...
    private CallBackItemList mListener;

    public MyAdapter(String[] myDataset, CallBackItemList listener) {
        ...
        mListener = listener;
    }

javikin

public class MainActivity extends Activity implements MyAdapter.CallBackItemList{
    
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        mAdapter = new MyAdapter(myDataset, this);
        ...

javikin

class MyAdapter(val mDataset: Array<String>,
                val itemClickListener: (String) -> Unit,
                val itemClickButtonListener: (String) -> Unit) :
        RecyclerView.Adapter<MyAdapter.ViewHolder>() {
          
   ...

    class ViewHolder(var mView: View) : RecyclerView.ViewHolder(mView) {
        fun bind(item: String,
                 itemClickListener: (String) -> Unit,

javikin

class MainActivity : Activity() {
    
    ...

    override fun onCreate(savedInstanceState: Bundle?) {
        ...
        mAdapter = MyAdapter(myDataset, {onClickActionItemList(it)}, {onClickActionButtonItemList(it)})
        ...
    }