Develop Reference

Rounded corners in a card view won't work at the bottom of image with a text view

I am trying to get a card view so that I get a rounded corners image with a text under it but the thing is, when I add the text, since they are both inside of the rounded corners card view, the image is not rounded at the bottom (which is what I need). How would I accomplish that?
This is the layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_margin="16dp"
app:cardCornerRadius="16dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/iv_news"
android:layout_width="300dp"
android:layout_height="200dp"
android:src="#drawable/background_shape"
android:scaleType="centerCrop" />
<TextView
android:id="#+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/news_title"
android:textColor="#color/black"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textAlignment="center"
android:layout_marginTop="5dp"/>
</LinearLayout>
</androidx.cardview.widget.CardView>
The image (I need the bottom corners of the image also rounded):

Try to put this code in your "#drawable/background_shape". Just tried it and it all working fine.
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:bottomLeftRadius="20dp" android:bottomRightRadius="20dp"/>
</shape>

The problem is the TextView is overlaying the card radius. To fix that add padding to the text view or to the card and that should solve it.
The answer marked as correct, is not clean: Adds an unnecessary drawable, the card view already has a corner radius property, making the child implement round corners as well defeat the purpose of such attribute.
Also, try to use material card view: <com.google.android.material.card.MaterialCardView/>. You might not needed it now but it has more customizations.

If you only need a circular image in that case you need to add only ImageView inside CardView, and which looks like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.cardview.widget.CardView
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_margin="16dp"
app:cardCornerRadius="16dp">
<ImageView
android:id="#+id/iv_news"
android:layout_width="300dp"
android:layout_height="200dp"
android:src="#drawable/background_shape"
android:scaleType="centerCrop" />
</androidx.cardview.widget.CardView>
<TextView
android:id="#+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/news_title"
android:textColor="#color/black"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textAlignment="center"
android:layout_marginTop="5dp"/>
</LinearLayout>

How to put an ImageView inside a CardView with border radius top?

My xml is as follows:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/recyclerMainCardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="18dp"
app:cardElevation="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="#+id/imgRecyclerMain"
android:layout_width="match_parent"
android:layout_height="100dp"
android:fitsSystemWindows="true"
android:scaleType="centerCrop" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="vertical"
android:weightSum="5">
<TextView
android:id="#+id/txtRecyclerMainTheme"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3"
android:textSize="20sp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:layout_weight="2"
android:orientation="horizontal">
<TextView
android:id="#+id/txtRecyclerMainNumberCommunity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:textSize="14sp" />
<TextView
android:id="#+id/txtRecyclerMainNumberArticles"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
That is my recycler_main_themes.xml which in inside a recycler view to display themes. The behavior of the image I'm looking for is to have the card with both left and right borders with 8dp radius, so I've put inside the MainActivity this:
cardView.setBackgroundResource(R.drawable.card_view_border);
And this is the card_view_border.xml:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/white" />
<corners android:topLeftRadius="10dp" android:topRightRadius="10dp" />
</shape>
But when the app runs, before the image is displayed, the cardView has both top borders with the radius then after the image is downloaded, the imageView overlaps the cardView and the card looks rectangular. Picture of how it is:
What am I missing to display it properly?
Edit: just to complement, I've tried many things such as changing the ImageView scaleType to fitXY, set setPreventCornerOverlap(false) on CardView, changing cardElevation on CardView and putting elevation on ImageView, but none succeeded.

How to use same technique of css "negative margin" in a layout?

I would like to create this kind of layout you see in the picture and I'm thinking like negative margin in CSS and no result. Please help me achieve it.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".HomeActivity">
<TextView
android:id="#+id/txt_home_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/box"
android:elegantTextHeight="true"
android:padding="30dp"
android:text="Welcome!"
android:textColor="#ffffff"
android:textSize="28sp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp">
<ImageView
android:id="#+id/home_logo"
android:layout_width="90dp"
android:layout_height="80dp"
android:scaleType="fitCenter"
android:src="#drawable/mylogo" />
</FrameLayout>
</android.support.constraint.ConstraintLayout>
Here is the box:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#2d3669"></solid>
<corners android:radius="50dp"></corners>
<gradient android:angle="90"
android:startColor="#392800"
android:endColor="#faae03"/>
</shape>
</item>
</selector>
I know in ConstraintLayout how to have items near each other, but I can't figure it out how to put a log on a TextView so that half of it remains outside! I can't find a keyword that leads to such examples on Google.

Here you go:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
tools:layout_editor_absoluteY="81dp">
<TextView
android:id="#+id/txt_home_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/box"
android:elegantTextHeight="true"
android:padding="30dp"
android:text="Welcome!"
android:textColor="#ffffff"
android:textSize="28sp"
tools:layout_editor_absoluteX="129dp"
tools:layout_editor_absoluteY="0dp" />
<android.support.v4.widget.Space
android:id="#+id/space"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="32dp"
app:layout_constraintBottom_toBottomOf="#+id/txt_home_title"
app:layout_constraintLeft_toLeftOf="#id/txt_home_title"
app:layout_constraintRight_toRightOf="#id/txt_home_title" />
<ImageView
android:id="#+id/home_logo"
android:layout_width="98dp"
android:layout_height="84dp"
android:scaleType="fitCenter"
android:src="#mipmap/ic_launcher"
app:layout_constraintHorizontal_bias="0.687"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/space" />
</android.support.constraint.ConstraintLayout>
Output:
Explanation:
We can not use negative margin in ConstraintLayout as it is not officially supported so we need to use a workaround. Add an empty view i.e. Space between ImageView and TextView and set android:layout_marginBottom="32dp" to Space view and you are done.
I followed this answer of CommonsWare.

There are at least 2 different ways to achieve this.
1. Anchor
If you want the logo's center to be exactly on the bottom edge of the TextView, use a CoordinatorLayout as the direct parent view of the logo and the TextView, and use the app:layout_anchor and app:layout_anchorGravity XML properties on the logo. For your example, the value of app:layout_anchor would be the ID of the TextView, and the value of app:layout_anchorGravity would be "bottom|end".
Note that you should be able to achieve any positioning that you want by encapsulating the logo within a parent layout, anchoring the parent to the TextView, and then setting margins on the logo to move it around within its transparent parent.
2. Negative margins (yep)
Android actually supports negative margins, although probably not with a ConstraintLayout. It definitely works with a RelativeLayout though! Considering that you want your ImageView to overlap the TextView, it would look like this:
<RelativeLayout
...
<TextView
android:id="#+id/myTextView"
... />
<ImageView
android:layout_below="#+id/myTextView"
android:layout_marginTop="-30dp"
... />
</RelativeLayout>
Keep in mind the Z ordering when doing this as well. In my example above the ImageView would be drawn on top of the TextView because it's declared after the TextView within its parent. If the ImageView would have been declared first, the TextView would be drawn on top of it.

Why using padding wouldn't help in increasing touch area of a View

I have a view (red circle).
I tend to increase its touch area, by using padding. I avoid using margin, as it wouldn't help in increasing touch area.
layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="48dp"
android:orientation="horizontal">
<View
android:paddingStart="36dp"
android:paddingLeft="36dp"
android:paddingEnd="36dp"
android:paddingRight="36dp"
android:layout_width="32dp"
android:layout_height="32dp"
android:background="#drawable/circle"
android:layout_gravity="center_vertical" />
<EditText
android:layout_width="0dp"
android:width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:layout_marginEnd="36dp"
android:layout_marginRight="36dp" />
</LinearLayout>
circle.xml
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid
android:color="#ff0000"/>
</shape>
However, as you can see, the touch area of the red circle is not enlarge still?
May I know why is it so? Is there any easy way I can increase the touch area of custom view?

Your padding is not affecting the View size and even if it was, the android:background covers ALL View space.
There's two alternatives:
Use a ImageView instead and android:src in place of android:background. The src will be the content and padding will be applied outside of it, while background will cover ALL view space.
Or add padding at the drawable.xml with the appropriate tags and attributes.
Update from OP
Using ImageView solved my problem
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="48dp"
android:orientation="horizontal">
<ImageView
android:layout_width="104dp"
android:layout_height="32dp"
android:paddingStart="36dp"
android:paddingLeft="36dp"
android:paddingEnd="36dp"
android:paddingRight="36dp"
android:src="#drawable/circle"
android:layout_gravity="center_vertical" />
<EditText
android:layout_width="0dp"
android:width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:layout_marginEnd="36dp"
android:layout_marginRight="36dp" />
</LinearLayout>

Drawable as Background for CardView

the CardView ( android.support.v7.cardview ) stays white even though I set a backround drawable via android:backround - The documentation gives me the feeling that it should work. No Idea what I am doing wrong here.

I know this is an old question, but I have a simple solution - just make the first child of your CardView an ImageView and specify the scale type to fitXY. You can get rid of the extra CardView padding by setting cardElevation and cardMaxElevation to 0dp:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
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="200dp"
app:cardCornerRadius="4dp"
app:cardElevation="0dp"
app:cardMaxElevation="0dp">
<ImageView
android:src="#drawable/your_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"/>
<... your layout
.../>
</android.support.v7.widget.CardView>

for drawable or color just use:
cvSellerShopp.setBackgroundResource(R.drawable.ic_action_add_image);
for color use:
cvSellerShopp.setCardBackgroundColor(R.color.colorPrimary);
but this one does not produce the intended results

Make Cardview will host one viewgroup for eg relative layout in this case and then simply set any background to relative layout.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/list_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="5dp"
card_view:cardCornerRadius="4dp"
card_view:cardUseCompatPadding="true">
<RelativeLayout
android:id="#+id/list_container_bg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical">
<!--Add cardview contents-->
</RelativeLayout>
</android.support.v7.widget.CardView>

I got this working by adding a linearlayout in the cardview and then setting cardPreventCornerOverlap to false in the cardview.
<android.support.v7.widget.CardView
android:id="#+id/result_cv"
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_margin="4dp"
app:cardCornerRadius="16dp"
app:cardElevation="8dp"
app:cardPreventCornerOverlap="false"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/gradient"
android:gravity="center"
>
<!-- your views -->
</LinearLayout>
</android.support.v7.widget.CardView>

The command I used was:
cardView.setBackgroundResource(R.drawable.card_view_bg);
where card_view_bg is a custom XML resource file.
If you have some layouts inside the card view and these layouts are overlapping with the margins of the card view then you might need a separate custom background resource file for the layouts like the one I used for the card view background itself.

Try this
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/list_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="5dp"
card_view:cardCornerRadius="4dp"
card_view:cardUseCompatPadding="true">
<RelativeLayout
android:id="#+id/list_container_bg"
android:layout_width="match_parent"
android:background="#drawable/yourbackground"
android:layout_height="match_parent">
<!--Add cardview contents-->
</RelativeLayout>
</android.support.v7.widget.CardView>
card_view:cardBackgroundColor="#android:color/holo_green_dark
here you can set any color or make it transparent by giving color transparent
and if u wand some drawable like image or svg put RelativeLayout background

You can use LinearLayout or Relative layout inside CardView and set drawable background it like below :
<android.support.v7.widget.CardView
android:id="#+id/card6"
android:layout_width="180dp"
android:layout_height="wrap_content"
android:layout_marginRight="8dp"
android:layout_marginTop="10dp"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/card4"
app:cardCornerRadius="10dp"
app:cardElevation="4dp"
app:cardMaxElevation="8dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#drawable/card_bg"
android:padding="10dp">
<ImageView
android:id="#+id/card6Image"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="center_horizontal"
android:src="#mipmap/ic_launcher_round" />
<TextView
android:id="#+id/card6Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:padding="5dp"
android:text="Daily Check In"
android:textColor="#ffffff"
android:textSize="15sp" />
<TextView
android:id="#+id/card6Description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="5dp"
android:text="Just Check in Daily and Earn Credits"
android:textColor="#ffffff"
android:textSize="10sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
Below is my Drawable resource file :
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<gradient
android:angle="90"
android:centerColor="#555994"
android:endColor="#b5b6d2"
android:startColor="#555994"
android:type="linear" />
<corners
android:radius="0dp"/>

you can set foreground as follow for the card view to set custom bg
android:foreground="#drawable/bg"
and here is the transparent bg.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#android:color/transparent" />
<stroke
android:width="1dp"
android:color="#d9d9d9" />
<corners android:radius="4dp" />
<padding
android:bottom="0dp"
android:left="0dp"
android:right="0dp"
android:top="0dp" />
</shape>

You have 2 possible solutions.
Setting background programmatically:
cardView.setBackgroundResource(R.drawable.background)
Add some child to cardview that will fill cardview's bounds and set background on it:
<android.support.v7.widget.CardView
...>
<ConstraintLayout
android:background="#drawable/background"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.v7.widget.CardView>
This way you can also give images some shape that you can configure by the shape of cardview. Disadvantage is that it is bad for performance.

Try this code:
cardView.setForeground(getResources().getDrawable(R.drawable.your_drawable));

sCard.setBackgroundResource(R.drawable.scard_background);

if you want change background color on cardView just add this code on your cardview XML
app:cardBackgroundColor="#color/whatever_color_you"

You can simply use the below line in your xml file.
app:cardBackgroundColor="#drawable/your_custom_theme_here"