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Not able to properly nest GridView inside Cardview

I use a RecyclerView , which renders CardView . This CardView has 2 TextViews and one GridView , The GridView renders CardView (lets call it inside_card )as its child. Now i am unable to change height of this inside_card . Given below is what i want to achieve(Image A) and what i am getting (Image B).
Given Below are my Layouts.
activity_main.xml contains RecylerView
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat 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"
android:orientation="vertical"
tools:context=".Activities.MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</androidx.recyclerview.widget.RecyclerView>
</androidx.appcompat.widget.LinearLayoutCompat>
activity_card.xml Contains Layout to be rendered inside RecyclerView
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardBackgroundColor="#AAA"
android:id="#+id/card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardCornerRadius="4dp"
android:layout_margin="8dp"
android:requiresFadingEdge="vertical">
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="wrap_content"
>
<TextView
android:id="#+id/proffName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ProfessorName"
android:textAlignment="center"
android:gravity="center_horizontal">
</TextView>
<TextView
android:id="#+id/subjectCode"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SemesterName"
android:textAlignment="center"
android:gravity="center_horizontal">
</TextView>
<GridView
android:layout_gravity="center"
android:id="#+id/unitsGrid"
android:layout_width="match_parent"
android:layout_height="80dp"
android:layout_weight="1"
android:layout_margin="6dp"
android:horizontalSpacing="2dp"
android:numColumns="2"></GridView>
</LinearLayout>
</androidx.cardview.widget.CardView>
</androidx.appcompat.widget.LinearLayoutCompat>
inside_card.xml contains layout to be rendered inside GridView
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/inside_card"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_margin="8dp"
app:cardCornerRadius="6dp"
app:cardElevation="6dp"
app:cardBackgroundColor="#eeeeee"
>
<TextView
android:textAlignment="center"
android:layout_gravity="center"
android:id="#+id/unitName"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="1dp"
android:textColor="#color/cardview_dark_background"
android:textSize="18dp" />
</androidx.cardview.widget.CardView> ```

Change in inside_card.xml
-> Increase the height of card view from 45dp to 120dp, tweak as per requirement
-> Set card elevation 0dp, as in the design A, there is no card elevation.
-> Even I will suggest, don't take card view for this, Just take simple LienarLayout and set a drawable shape with stroke for this. Because Setting border on card view is a little tedious task.
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/inside_card"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="120dp"
android:layout_margin="8dp"
app:cardCornerRadius="6dp"
app:cardElevation="0dp"
app:cardBackgroundColor="#eeeeee"
>
<TextView
android:textAlignment="center"
android:layout_gravity="center"
android:id="#+id/unitName"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="1dp"
android:textColor="#color/cardview_dark_background"
android:textSize="18dp" />
</androidx.cardview.widget.CardView> `
In your GridView, set vertical spacing too
<GridView
android:layout_gravity="center"
android:id="#+id/unitsGrid"
android:layout_width="match_parent"
android:layout_height="80dp"
android:layout_weight="1"
android:layout_margin="6dp"
android:horizontalSpacing="15dp"
android:verticalSpacing="15dp"
android:numColumns="2"></GridView>

adView is not visible with wrap content

In the XML layout, everything seems perfect. When I used the emulator or real device, the adView is not visible. I tried to give height to adView like 200 dp. Then the adView is visible. But, when I gave the value of wrap_content for the height of the adView, there is a problem. I used LinearLayout and RelativeLayout but the problem is the same. What should I do for this?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical"
android:padding="30dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center"
android:text="#string/nav_contact_us_content_explanation" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:autoLink="email"
android:gravity="center"
android:selectAllOnFocus="false"
android:text="#string/nav_contact_us_content_mail" />
</LinearLayout>
<com.google.android.gms.ads.AdView
android:id="#+id/adview_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111"></com.google.android.gms.ads.AdView>
</LinearLayout>

Try to put AdView in FrameLayout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical"
android:padding="30dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center"
android:text="#string/nav_contact_us_content_explanation" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:autoLink="email"
android:gravity="center"
android:selectAllOnFocus="false"
android:text="#string/nav_contact_us_content_mail" />
</LinearLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.gms.ads.AdView
android:id="#+id/adview_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111"/>
</FrameLayout>
</LinearLayout>

In the case of LinearLayout, as the weight was set to 1, it took the whole screen when the ad was not yet loaded. However, you should see a warning like the following in your logcat here.
W/Ads: Not enough space to show ad. Needs 320x50 dp, but only has 288x495 dp.
In order to fix the problem, you might consider using a RelativeLayout instead of a LinearLayout like the following.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/adview"
android:orientation="vertical"
android:padding="30dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center"
android:text="Contact us" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:autoLink="email"
android:gravity="center"
android:selectAllOnFocus="false"
android:text="Email" />
</LinearLayout>
<LinearLayout
android:id="#+id/adview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
<com.google.android.gms.ads.AdView
android:id="#+id/adview_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="true"
ads:adSize="SMART_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111" />
</LinearLayout>
</RelativeLayout>
On the other hand, you might also consider setting up a fixed size for the AdView so that it does not hide when the content is not yet loaded. You can get the sizes of different types of ads for different screen sizes here.

How to design this Grid view xml page?

I want to design xml page this type. I tried many of the code. Every time new problems are come. I need bottom navigation bar is fixed. In grid view ,i want android:numColums=3, android:verticalSpacing and android:horizontalSpacing Same(Look like instagram profile view grid images ).
XMl Code:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainSettingClass">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="175dp"
android:background="#dadada"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:id="#+id/profile_image"
android:layout_width="100dp"
android:layout_height="100dp"
android:src="#drawable/com_facebook_button_background"/>
<TextView
android:id="#+id/amsc_txt_fbusername"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="TextView"
android:layout_marginTop="2dp" />
</LinearLayout>
<GridView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/grid_test"
android:verticalSpacing="2dp"
android:horizontalSpacing="2dp"
android:background="#FFFFFF"
android:stretchMode="columnWidth"
android:columnWidth="85dp"
android:numColumns="3"/>
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_gallery"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#ffffff"
app:menu="#menu/bottom_navigation_gallery"/>
</FrameLayout>

As per your design you need scrollview for 2 above components and your BottomNavigationView is fix (not movable).
In your code you are not using scrollview first and second i'm not sure why you're using framelayout!
Here's my code which is exactly as per your given design try this if any concern you can ask! :)
Here's my code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ScrollView
android:id="#+id/scroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottom_gallery">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="#+id/rel_titleHolder"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#dadada"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:id="#+id/profile_image"
android:layout_width="100dp"
android:layout_height="100dp"
android:src="#mipmap/ic_launcher" />
<TextView
android:id="#+id/amsc_txt_fbusername"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:gravity="center"
android:text="TextView" />
</LinearLayout>
<GridView
android:id="#+id/grid_test"
android:layout_width="match_parent"
android:layout_height="400dp"
android:columnWidth="85dp"
android:horizontalSpacing="2dp"
android:numColumns="3"/>
</LinearLayout>
</ScrollView>
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_gallery"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ffffff"
android:layout_alignParentBottom="true" />
</RelativeLayout>

Cardview is all goes into one card

I have made and app with CardView, but my cardview is going into one card.
My Code:
recyclerview_activity.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:padding="16dp"
>
<android.support.v7.widget.RecyclerView
android:layout_height="match_parent"
android:layout_width="match_parent"
android:id="#+id/rv"
>
</android.support.v7.widget.RecyclerView>
</LinearLayout>
I get something like this

I think the only issue is with the gap between your CardViews. You must not be having CompatPadding true in CardView thats why it looks like the data is clubbed into one CardView try making it true.
Use following code it should work :
<?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:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cv"
card_view:cardCornerRadius="5dp"
card_view:cardUseCompatPadding="true"
android:foreground="?android:attr/selectableItemBackground"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/person_photo"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginRight="16dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/person_name"
android:layout_toRightOf="#+id/person_photo"
android:layout_alignParentTop="true"
android:textSize="30sp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/person_age"
android:layout_toRightOf="#+id/person_photo"
android:layout_below="#+id/person_name"
/>
</RelativeLayout>
</android.support.v7.widget.CardView>

XML layout 2 views in centre, one at top

I created linearlayout with two buttons in center (buttons 1 and 2), but I can't manage it to create the view 3 on top, which I need to make it fill whole width and adjust it's height by it (keep proportions). How do I create third view?
Image:
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/bg"
android:layout_gravity="center_horizontal"
android:orientation="horizontal">
<LinearLayout
android:orientation="vertical"
android:layout_gravity="center_vertical"
android:layout_width="fill_parent" android:layout_height="wrap_content" >
<ImageButton
android:background="#drawable/btn_one"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="1.0" />
<ImageButton
android:background="#drawable/btn_second"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="1.0" />
</LinearLayout>

I would recommend you use relative layouts, they are the closest thing in android to an "absolute layout" replace the button tags with Image button tags
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true">
</RelativeLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button2"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="215dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button3"
android:layout_below="#+id/button2"
android:layout_alignStart="#+id/button2" />
</RelativeLayout>

try this code set height and width what size of image button you need and simple look what you need.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">
<ImageButton
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.2"
android:orientation="vertical"
android:gravity="center">
<ImageButton
android:layout_width="200dp"
android:layout_height="50dp"/>
<ImageButton
android:layout_width="200dp"
android:layout_height="50dp" />
</LinearLayout>