围绕另一个CircleImageView的枢轴点旋转CircleImageView

Question

I am working at a project in Xamarin. Android where I use the CircleImageView NuGet package(which is just a library for RoundedImageViews ). I have a CircleImageView (call it civ1 ), and another one(call it civ2 ). I want to rotate civ2 around civ1 's center, at a certain angle. I know I can use

android:rotation="90" to rotate civ2 , but this will just rotate it around its own center which I don't want. So how could I rotate civ2 around civ1 's center point?

    <FrameLayout
        android:id="@+id/IDEQSVFL"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:background="@drawable/roundcornerslayout">
        <refractored.controls.CircleImageView
            android:id="@+id/civ1"
            android:layout_width="110dp"
            android:layout_height="110dp"
            android:layout_marginLeft="30dp"
            android:layout_gravity="left|center_vertical"
            android:src="@drawable/ME_RotatoryKnobMainImage" />
        <refractored.controls.CircleImageView
            android:id="@+id/civ2"
            android:layout_width="11dp"
            android:layout_height="11dp"
            android:layout_gravity="left|center_vertical"
            android:src="@drawable/ME_RotatoryKnobLed" />
</FrameLayout>

This is my code.

Answer 1

android:rotation="90" to rotate civ2, but this will just rotate it around its own center which I don't want. So how could I rotate civ2 around civ1's center point?

If you want the small circle to be in certain position that related to the circle 2, you just need to modify layout_marginLeft and layout_marginTop to change the position of the small circle:

<FrameLayout
    android:id="@+id/IDEQSVFL"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="300dp"
    android:background="@drawable/snow">
    <refractored.controls.CircleImageView
        android:id="@+id/civ1"
        android:layout_width="110dp"
        android:layout_height="110dp"
        android:layout_marginLeft="30dp"
        android:layout_gravity="left|center_vertical"
        android:src="@drawable/timg2" />
    <refractored.controls.CircleImageView
        android:id="@+id/civ2"
        android:layout_width="11dp"
        android:layout_height="11dp"
        android:layout_marginTop="50dp"
        android:layout_marginLeft="78dp"
        android:layout_gravity="top"
        android:src="@drawable/timg2" />
</FrameLayout>