Contextual Action Mode Example in Android

package com.example.contextual_action_mode;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
 
public class MainActivity extends Activity {
 
    protected Object actiob;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        View view = findViewById(R.id.text);
        view.setOnLongClickListener(new View.OnLongClickListener() {
            public boolean onLongClick(View view) {
                if (actiob != null) {
                    return false;
                }
 
                actiob = MainActivity.this.startActionMode(actiobCallback);
                view.setSelected(true);
                return true;
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return true;
    }
 
    private ActionMode.Callback actiobCallback = new ActionMode.Callback() {
 
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            MenuInflater inflater = mode.getMenuInflater();
            inflater.inflate(R.menu.contextual, menu);
            return true;
        }
 
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return false;
        }
 
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            switch (item.getItemId()) {
            case R.id.toast:
                Toast.makeText(MainActivity.this, "Selected menu",
                        Toast.LENGTH_LONG).show();
                mode.finish();
                return true;
            default:
                return false;
            }
        }
 
        public void onDestroyActionMode(ActionMode mode) {
            actiob = null;
        }
    };
}