create view over cardview in android

问题

I want to create this layout

this is a cardview (gray view) and imageview(blue view) for that i use this code

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/abc_search_url_text_normal"
android:orientation="vertical">

<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_alignParentBottom="true"
    android:layout_gravity="bottom"
    android:layout_marginBottom="3dp"
    android:paddingTop="5dp"
    app:cardBackgroundColor="@color/abc_input_method_navigation_guard">


</android.support.v7.widget.CardView>

<ImageView
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_gravity="bottom"
    android:layout_marginBottom="30dp"
    android:layout_marginRight="10dp"
    android:scaleType="fitXY"
    android:src="@drawable/abc_ratingbar_full_material" />

</FrameLayout>

but in result my image view going to back of cardview i try reletivelayout instead of framelayout but same result.

回答1:

Try:

• Use a RelativeLayout

• Align the ImageView to the parent right/end and add a right/end margin

• Align the FAB to the top of the card view and add a negative margin

<RelativeLayout
    ...>
    <CardView
    android:id="@+id/cardView"
    android:layout_width="match_parent"
    android:layout_height="120dp"
    />

   <ImageView
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_alignTop="@id/cardView"
    android:layout_marginTop="-32dp"
    android:layout_marginRight="20dp"
   />

</RelativeLayout>

回答2:

The CardView has by default elevation in API 21+, you can manipulate the elevation to be less than that of the ImageView

    <android.support.v7.widget.CardView  xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     app:cardElevation="1dp"/>

 <ImageView
        android:id="@+id/image_view_user"
        android:layout_width="48dp"
        android:layout_height="48dp"
         android:elevation="2dp"/>

in Pre 21 you can use

overlayView.bringToFront();
root.requestLayout();
root.invalidate();

This will not work in 21+ if you have different elevation

回答3:

Just put CardView in other view like in FrameLayout. Just like below:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_marginStart="10sp"
android:layout_marginEnd="10sp"
>
<FrameLayout
    android:layout_marginTop="15sp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="100sp"
        app:cardCornerRadius="5sp"
        app:cardBackgroundColor="@color/colorPrimary">
    <!--other view items -->
    </android.support.v7.widget.CardView>
</FrameLayout>
     <de.hdodenhof.circleimageview.CircleImageView
        android:layout_width="90sp"
        android:layout_height="90sp"
        app:civ_border_width="2dp"
        android:layout_marginStart="10sp"
        app:civ_border_color="@color/colorPrimaryDark"
        android:id="@+id/profileImg"
        android:background="@drawable/ic_if_profle_1055000"
        xmlns:app="http://schemas.android.com/apk/res-auto"/>

Screenshot:

来源：https://stackoverflow.com/questions/33823373/create-view-over-cardview-in-android