android - Appcompat CardView and Picasso no rounded Corners

Question

I do not know where Exactly i Should Adress this issue, if it is my fault, there is something in the Picasso Lib Wrong or in the Cardview Library.

Basicly i have a CardView containing an image (Full Card Covered) and A TextView overlaying.

When Running the Code on a Android 5.0 Device, everything works fine and the Image Gets its Rounded Corners.

However if i run it on a pre 5.0 device, the image overlaps the Cardlayout and does not have rounded Corners.

You can See a Comparison on this Image:

Here are some Code Snippets:

layout_row.xml

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/pandaImage"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_centerInParent="true"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/pandaName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/pandaImage"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:background="@color/photo_tint"
        android:clickable="true"
        android:focusable="true"
        android:gravity="center"
        android:textColor="@android:color/white"
        android:textSize="24sp" />

</RelativeLayout>

And the Recycler Adapter Loading the Image:

@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
    Photo p = photos.get(i);
    Picasso.with(mContext).load(p.getUrl()).fit().into(viewHolder.mImage);
    viewHolder.mPandaName.setText(p.getTitle());
}

Answer 1

According to the docs, this as designed:

Due to expensive nature of rounded corner clipping, on platforms before L, CardView does not clip its children that intersect with rounded corners. Instead, it adds padding to avoid such intersection (See setPreventCornerOverlap(boolean) to change this behavior).

See the CardView docs for more info.