Define menus using XML resource files

Use xml Resource file definition menu
The new version android It's hidden menu Key
menu file

<?xml version="1.0" encoding="utf-8"?>

        </group>
    </menu>
</item>
<!-- Define a common menu item -->
<item
    android:id="@+id/plain_item"
    android:title="@string/plain_item" />
<item
    android:icon="@drawable/mia5"
    android:title="@string/font_color">
    <menu>
        <!--             Define a set of common menu items -->
        <group>
            <!--                 Define three menu options -->
            <item
                android:id="@+id/red_font"
                android:title="@string/red_title" />
            <item
                android:id="@+id/green_font"
                android:title="@string/green_title" />
            <item
                android:id="@+id/blue_font"
                android:title="@string/blue_title" />

        </group>

    </menu>
</item>

<?xml version="1.0" encoding="utf-8"?>

xml file

<?xml version="1.0" encoding="utf-8"?>

<TextView
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
android:text=“xml Set file definition menu ”

  android:id="@+id/textview001"/>

java file
public class MainActivity extends Activity {
private TextView tv;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.menu);
    tv=findViewById(R.id.textview001);
    // Register context menu for text box 
    registerForContextMenu(tv);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater=new MenuInflater(this);
    // To fill in R.menu.text_menu Corresponding menu , To add to menu in 
    inflater.inflate(R.menu.text_menu,menu);
    return super.onCreateOptionsMenu(menu);
}

// This method is triggered when the context menu is created 

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    MenuInflater inflater=new MenuInflater(this);
            // To fill in R.menu.context,menu Corresponding menu , To add to menu in 
    inflater.inflate(R.menu.context,menu);
    menu.setHeaderIcon(R.drawable.mia5);
    menu.setHeaderTitle(" Please select a background color ");
    super.onCreateContextMenu(menu, v, menuInfo);
}
// This method is triggered when a menu item in the context menu is clicked 

@Override
public boolean onContextItemSelected(@NonNull MenuItem item) {
    // Check this menu item 
    item.setChecked(true);
    switch (item.getItemId()){
        case R.id.red:
            item.setChecked(true);
            tv.setBackgroundColor(Color.RED);
            break;
        case R.id.green:
            item.setChecked(true);
            tv.setBackgroundColor(Color.GREEN);
            break;
        case  R.id.blue:
            item.setChecked(true);
            tv.setBackgroundColor(Color.BLUE);
            break;

    }        return true;
}
// The callback method after the menu item is clicked 

@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
    if (item.isCheckable()){
        // Check this menu item 
        item.setChecked(true);
    }
    // Judge which item is clicked , And make targeted response 
    switch (item.getItemId()){
        case R.id.font10:
            tv.setTextSize(10*2);
            break;
        case R.id.font12:
            tv.setTextSize(12*2);
            break;
        case R.id.font14:
            tv.setTextSize(14*2);
            break;
        case R.id.font16:
            tv.setTextSize(16*2);
            break;
        case R.id.font18:
            tv.setTextSize(18*2);
            break;
        case R.id.red_font:
            tv.setTextColor(Color.RED);
            item.setChecked(true);
            break;
        case R.id.green_font:
            tv.setTextColor(Color.GREEN);
            item.setChecked(true);
            break;
        case R.id.blue_font:
            tv.setTextColor(Color.BLUE);
            item.setChecked(true);
            break;
        case  R.id.plain_item:
            Toast toast=Toast.makeText(MainActivity.this," You clicked the normal menu item ",Toast.LENGTH_SHORT);
            toast.show();
            break;


    }
    return true;
}

}