This blog is about counter badge on icon of Menu . like counter of Notification.

Here is code of this tutorial.

1. Create project.

2. Create text_circle.xml in res->drawable folder.

3. Write below code to text_circle.xml.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <corners
        android:bottomLeftRadius="10dp"
        android:bottomRightRadius="10dp"
        android:topLeftRadius="10dp"
        android:topRightRadius="10dp" />
    <solid android:color="@android:color/holo_red_dark" />

</shape>

4. Create one layout file with name:- counter_menu_item_layout.xml.

5. Copy below code to xml.

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/BadgeFrameLayout"
    android:layout_width="42dp"
    android:layout_height="42dp"
    android:background="@mipmap/ic_launcher">

    <RelativeLayout
        android:id="@+id/BadgeRelativeLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:background="@drawable/text_circle">

        <TextView
            android:id="@+id/BadgeCount"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerHorizontal="true"
            android:padding="2dp"
            android:textColor="@android:color/white"
            android:textSize="10sp" />
    </RelativeLayout>

</FrameLayout>

6. Create menu folder under res folder.

7. create menu file in menu folder.

8. Paste below code to menu xml.

<menu 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"
    tools:context=".MainActivity">

    <item
        android:id="@+id/BadgeAction"
        android:icon="@drawable/ic_notification"
        android:orderInCategory="1"
        android:title="Notification"
        app:showAsAction="always" />

</menu>

9. Open java class of Activity.

10. Write Override onCreateOptionsMenu() to Activity.

11. Paste below code to onCreateOptionsMenu().

 getMenuInflater().inflate(R.menu.menu, menu);

        MenuItem menuItem = menu.findItem(R.id.BadgeAction);
        menuItem.setIcon(buildCounterDrawable(appBadgeCount, R.drawable.ic_notification));

        return true;

12. create  buildCounterDrawable().

private Drawable buildCounterDrawable(int count, int backgroundImageId){}

13. Paste below code to buildCounterDrawable().

LayoutInflater inflater = LayoutInflater.from(this);
        View view = inflater.inflate(R.layout.counter_menu_item_layout, null);
        view.setBackgroundResource(backgroundImageId);

        if (count == 0) {
            View counterTextPanel = view.findViewById(R.id.BadgeRelativeLayout);
            counterTextPanel.setVisibility(View.GONE);
        } else {
            TextView textView = (TextView) view.findViewById(R.id.BadgeCount);
            textView.setText("" + count);
        }

        view.measure(
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        view.setDrawingCacheEnabled(true);
        view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
        Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
        view.setDrawingCacheEnabled(false);

        return new BitmapDrawable(getResources(), bitmap);

result:-

Happy Coding :D