Option Menu

optionmenu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:icon="@drawable/menu"
        android:title="Menu"
        app:showAsAction="always">

        <menu>
            <item
                android:id="@+id/home"
                android:icon="@drawable/home"
                android:title="Home" />

            <item
                android:id="@+id/settings"
                android:icon="@drawable/settings"
                android:title="Settings" />

            <item
                android:id="@+id/about"
                android:icon="@drawable/info"
                android:title="About" />
        </menu>
    </item>
</menu>

Activity.xml

<androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/primary"
    android:theme="@style/ThemeOverlay.AppCompat.DayNight.ActionBar"
    app:layout_constraintTop_toTopOf="parent"
    app:popupTheme="@style/Theme.AppCompat.Light"
    app:title="Option Menu"
    app:titleTextColor="@color/white" />

OptionMenuActivity.java

public class OptionMenuActivity extends AppCompatActivity {

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

        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.optionmenu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        int id = item.getItemId();
        switch (id) {
            case R.id.home:
                Toast.makeText(this, "Home", Toast.LENGTH_SHORT).show();
                break;
            case R.id.settings:
                Toast.makeText(this, "Setting", Toast.LENGTH_SHORT).show();
                break;
            case R.id.about:
                Toast.makeText(this, "About", Toast.LENGTH_SHORT).show();
                break;
        }
        return true;
    }
}