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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>

Responsive View in Android Studio

friends i am working on Android Studio to develop an app, the app will be used on Tablets and also other android phones. But i am getting some problems while designing the View (Template). Please help me to sort out this problem.
I am using ConstraintLayout as the mainLayout, and inside it i am using linearlayout with vertical orientation. You can check the code and output
If i use the listView highet as 0dp then it will show nothing
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:id="#+id/mainLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/my_images_gallary"
android:textSize="36sp"
android:textStyle="bold" />
<ListView
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="0dp">
</ListView>
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="150dp"
android:text="Button" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
[Output for the height is 0dp][1]
and if i use the ListView Height as match_parent so the bottom button will not appear.
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:id="#+id/mainLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/my_images_gallary"
android:textSize="36sp"
android:textStyle="bold" />
<ListView
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="150dp"
android:text="Button" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Output for the height is match_parent
Actually i want the listView should show all with scrolling and and the button should be seen all time while the listview is being scroll or not.
Expected Output which i am failed to get

Idea 1:
give fixed height to button and textview. Then use 0dp height to listview
Idea 2:
Use weight_sum to linear layout and give layout_weight to button,textview and listview as you expect.

Bottom Navigation Bar not shown in activity

I have an activity with a title, a fragment with a recyclerview full of cards and a bottom navigaton bar.
I cannot manage to show all 3 together without problems, the closest I have been is showing all 3, but with the bar taking space from the cards space.
Right now this is the XML which I thought should be working:
<LinearLayout 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=".habits.HabitsActivity">
<ImageView
android:id="#+id/imageView"
android:layout_width="313dp"
android:layout_height="166dp"
android:layout_gravity="center_horizontal"
app:srcCompat="#drawable/goodreasons" />
<android.support.design.widget.CoordinatorLayout
android:id="#+id/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/contentFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
</android.support.design.widget.CoordinatorLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom">
<com.aurelhubert.ahbottomnavigation.AHBottomNavigation
android:id="#+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom" />
</FrameLayout>
</LinearLayout>
But this gives this output:
This is the xml of the fragment, in case you think it is relevant too.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_gravity="center"
android:orientation="vertical"
android:padding="5dp"
>
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_list"
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0"
android:layout_gravity="center"
/>
</LinearLayout>

Here's your layout, stripped down:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="313dp"
android:layout_height="166dp"/>
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
Your problem is that the CoordinatorLayout has a match_parent height, so it will take up all of the space that the ImageView doesn't. That leaves no space at all for the FrameLayout, so you won't be able to see anything inside of it.
Probably the best thing to do would be to use layout_weight on the CoordinatorLayout to make it take up as much space as it can while still leaving room for other views. That would look something like this:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="313dp"
android:layout_height="166dp"/>
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
The only changes I made were to set the CoordinatorLayout's height to 0dp and the FrameLayout's height to wrap_content, and to add the weight attribute to the CoordinatorLayout.

CardView Spacing between each separate card is non-existent

Below you will find a screenshot. As you can see, between each card in my CardView, there is no spacing (They are bunched up below one another) The CardView
I am trying to get a spacing between each separate card. (Each card contains an image, an item number and a boolean)
I have tried card_view:cardUseCompatPadding="true" and adding padding manually.
activity_login.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"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:padding="16dp">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:id="#+id/cv"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
card_view:cardPreventCornerOverlap="true"
card_view:cardUseCompatPadding="true"
card_view:cardCornerRadius="10dp">
<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>
</LinearLayout>
recyclerview_activity.xml
<?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="wrap_content"
android:padding="16dp"
android:backgroundTint="#e6e6e6">
<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>

In the parent of CardView: LinearLayout define android:layout_margin="XXdp". That might help.

You need to define margin top inside widget.CardView:
android:layout_marginTop="2dp"
And You don't need the linear layout.

Android - what kind of view/xml I've to study

Problem I want view-layout like the following photo, on top I want image view, in the middle a text view and bottom list of items. All this I want to be scrollable (black arrow in the picture). in this way, the user for first see image-text-and part of list items, if scroll down, see the list of item.
For the bottom I thought to use listView, but in this way I think I'll have 2 scrollable view (???) and then I want to make the list in 2 columns, and I don't know if it is possible with ListView
Question
I didn't write code, because I want to know what kind of view or somethings else I've to study.
I sketchy something like this, but the result is really horrible
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
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">
<RelativeLayout
android:layout_width="match_parent" android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="200dp"
app:srcCompat="#drawable/nope"
android:id="#+id/imageView4"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true" />
<View
android:id="#+id/centerShim5"
android:layout_height="0dp"
android:layout_width="match_parent"
android:layout_centerInParent="true"
android:visibility="invisible" />
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/list"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/textView2"
android:textColor="#color/ame_default_cluster_circle_color_medium"
android:textSize="26dp"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
</ScrollView>

I can't use listview in Scrollview, and inspired by the matryoshka I found the solution.
I define xml1 file in which I have only ScrollView and LinearLayout inside
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="#+id/linear">
</LinearLayout>
</ScrollView>
after, for each kind of items that I want to add inside, I define another xml2 and after I add element:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/ame_default_cluster_text_color">
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="5"
android:textSize="32sp"
android:textColor="#color/ame_default_cluster_circle_shadow_color"
android:id="#+id/text1"
android:textAlignment="center" />
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:srcCompat="#drawable/nope"
android:id="#+id/photo" />
<TextView
android:text=" "
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
android:id="#+id/descrtiption"
android:textColor="#color/ame_default_cluster_circle_shadow_color"
android:layout_margin="10sp" />
</LinearLayout>
with code:
layoutInflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View item_view=layoutInflater.inflate(R.layout.xml1,container,false);
LinearLayout linearLayout=(LinearLayout)item_view.findViewById(R.id.linear);
LayoutInflater inflater= LayoutInflater.from(ctx);
View view1 = inflater.inflate(R.layout.xml2, linearLayout, false);
TextView text1=(TextView)view1.findViewById(R.id.text1);
text1.setText();
ImageView imageview=(ImageView)view1.findViewById(R.id.photo);
and obviously I can define XML for element to add like listview and add it with normal foreach ,Hope this will help someone.