How to get height and width of a popup menu in android?

I have a popup menu and I just want to get dimensions of it to use in my showCaseView for my guided tour. I could not find anywhere the way to determine these dimensions (height and width).

private void initPopUpMenu() {
    PopupMenu popupMenu = new PopupMenu(TimelineActivity.this, menuIcon);
    popupMenu.getMenuInflater().inflate(R.menu.menu_timeline, popupMenu.getMenu());
}

How to retrieve width and height from this structure? It's a simple menu resource with 5 items

The best solution is to use ListPopupWindow instead of PopupMenu which has getWidth() and getHeight() methods to get its dimensions. However, if you really want to use PopupMenu, the possible tricky way is to use Reflection to access its internal ListView, because there is no method available in PopupMenu to access the content view.

Usage:

PopupMenu popupMenu = initPopUpMenu();
popupMenu.show();

ListView listView = getPopupMenuListView(popupMenu);

androidx.core.view.ViewKt.doOnLayout(listView, view -> {
    System.out.println("PopupMenu Size: " + view.getWidth() + " x " + view.getHeight());
    return null;
});

Methods:

private PopupMenu initPopUpMenu() {
    PopupMenu popupMenu = new PopupMenu(TimelineActivity.this, menuIcon);
    popupMenu.getMenuInflater().inflate(R.menu.menu_timeline, popupMenu.getMenu());
    return popupMenu;
}

private ListView getPopupMenuListView(PopupMenu popupMenu) {
    Method getMenuListViewMethod = null;
    try {
        getMenuListViewMethod = PopupMenu.class.getDeclaredMethod("getMenuListView");
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    }

    ListView listView = null;
    if (getMenuListViewMethod != null) {
        getMenuListViewMethod.setAccessible(true);
        try {
            listView = (ListView) getMenuListViewMethod.invoke(popupMenu);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    }
    return listView;
}

build.gradle:

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation 'androidx.core:core-ktx:1.3.0'
}

Result:
> I/System.out: PopupMenu Size: 539 x 660

You can use custom layout with PopupWindow and then measure it

val popupWindow = PopupWindow(context)
popupWindow.contentView = View.inflate(context, R.layout.my_popup, null).apply {
    measure(
        View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
        View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
    )
    measuredWidth// <-- here is width
    measuredHeight// <-- here is height
}