【ANDROID STUDIO】 Contextual Menu

package com.example.contextualmenu;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.view.ActionMode;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    ActionMode mActionMode;

    private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {
        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            mode.getMenuInflater().inflate(R.menu.context_menu, menu);
            return true;
        }

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return false;
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            switch (item.getItemId()) {
                case R.id.menu_cast:
                    Toast.makeText(MainActivity.this, "Cast", Toast.LENGTH_SHORT).show();
                    mode.finish();
                    return true;
                case R.id.menu_print:
                    Toast.makeText(MainActivity.this, "Print", Toast.LENGTH_SHORT).show();
                    mode.finish();
                    return true;
                default:
                    return false;
            }
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            mActionMode = null;
        }
    };

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

        ImageView imageView = findViewById(R.id.imageView);
        imageView.setOnLongClickListener(new View.OnLongClickListener() {
            public boolean onLongClick(View view) {
                if (mActionMode != null) return false;
                mActionMode = startSupportActionMode(mActionModeCallback);
                ((ActionMode) mActionMode).setTitle("New Title");
                return true;
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@mipmap/ic_launcher" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
    <menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item android:id="@+id/menu_cast"
        android:title="@string/menu_cast" />>
    <item android:id="@+id/menu_print"
        android:title="@string/menu_print" />>
</menu>