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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.

Android Margin and Padding aren't working for RecyclerViews inside ScrollViews

When I place a RecyclerView as a child of a ScrollView, marginBottom and paddingBottom doesn't work. Setting these values for the parent LinearLayout doesn't affect anything either. It seems that the ScrollView doesn't scroll to the bottom because the ScrollBar doesn't reach the bottom. How can I fix this bug?
<LinearLayout android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
<!--To avoid scroll view from scrolling to the bottom automatically-->
<View android:layout_width="match_parent" android:id="#+id/focus_view" android:layout_height="0dp" android:focusable="true" android:focusableInTouchMode="true"><requestFocus/></View>
<ScrollView
android:id="#+id/sv_categories_statistics"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="10">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="4dp">
<LinearLayout
android:id="#+id/ll_categories_statistics_filters_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="4dp"
android:layout_marginTop="4dp"
android:layout_marginEnd="4dp">
<LinearLayout
android:id="#+id/ll_categories_statistics_select_date_fragment_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#drawable/border_primary_light"
android:padding="4dp"
android:layout_marginEnd="4dp"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#drawable/border_accent"
android:padding="4dp">
<Spinner
android:id="#+id/spn_categories_statistics_bill_type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
<com.github.mikephil.charting.charts.PieChart
android:id="#+id/pc_categories_statistics"
android:layout_width="match_parent"
android:layout_height="325dp"
android:layout_margin="4dp"/>
<fragment
android:id="#+id/fgm_categories_statistics_not_enough_data"
class="com.dolinsek.elias.cashcockpit.NotEnoughDataFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
app:text="#string/label_not_enough_data_for_statistic"
android:layout_marginStart="4dp"
android:layout_marginEnd="4dp"
android:layout_marginBottom="8dp"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_categories_statistics"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</ScrollView>

Have you tried clipToPadding
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_categories_statistics"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="50dp"
android:clipToPadding="false"/>

Android - ImageView fit in TableLayout

How to make sure my Imageview fit in TableLayout? Mine can't be fit like this one.
Mine is like this
My code
<?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"
android:orientation="vertical"
android:scrollbars="none" >
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TableRow
android:id="#+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:src="#drawable/kelas_mengaji" />
</LinearLayout>
</TableRow>
</TableLayout>
</ScrollView>

Add this to the ImageView
android:adjustViewBounds="true"

Android ImageView getting over linearlayout

I'm developing an android application, The layout is shown in the image below :
Screenshot http://www.lebanon-trading-center.com/daymanager/layout.PNG
The layout contains 2 main linearlayouts : a horizontal layout that takes 90% of the height of the device and a vertical layout that takes 10% of it. Inside the horizontal linearlayout there is three linearlayout ( two red and one containing an imageview). Each red layout is 10% of the width of the screen and the one containing the ImageView is 80%. Here is the xml 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:orientation="vertical"
android:weightSum="1" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_weight="0.9"
android:weightSum="1"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="0.1"
android:background="#ff0000" >
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal"
android:gravity="center_horizontal"
android:layout_weight="0.8" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:src="#drawable/ic_launcher" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="0.1"
android:background="#ff0000" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="0.1"
android:background="#000000" >
</LinearLayout>
</LinearLayout>
The problem is, when I set a PNG image (1036px X 730px ) as a source to the ImageView, the ImageView will get over the bottom linearlayout ( the black one ) and the two red layouts will be squeezed.
Screenshot http://www.lebanon-trading-center.com/daymanager/layout2.PNG
My question is how can I solve the problem and have the same layouts functional on all kind of tablets ?

Try this way,hope this will help you to solve your problem.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:orientation="horizontal"
android:layout_weight="0.90">
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="0.10"
android:background="#ff0000" >
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:layout_weight="0.80" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"
android:src="#drawable/ic_launcher" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="0.10"
android:background="#ff0000" >
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:orientation="vertical"
android:layout_weight="0.10"
android:background="#000000" >
</LinearLayout>
</LinearLayout>

How to center in ScrollView and LinearLayout

Please have a look at the following code
<ScrollView 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"
tools:context=".DisplayResult" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<ImageView
android:id="#+id/zodiac1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/aries"
/>
<TextView
android:id="#+id/orTxt"
android:text="Or"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<ImageView
android:id="#+id/zodiac2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/gemini"
/>
</LinearLayout>
</ScrollView>
I need to center everything inside the LinearLayout. I must use scrollview because when the app is 100% done, there will be lot of information which cannot be viewed by a single glance, without scrolling. How can make these center? Please help!
UPDATE
use any layout inside the scroll, no prob. But I need those elements to be in the same order (one after another) and centered.

you need to set gravity as centered for linear layout
< LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="horizontal" >

This one worked for me:
<LinearLayout 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"
android:gravity="center">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center"

Try using layout_gravity on your LinearLayout to center_horizontal:
<LinearLayout
android:layout_width="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_height="wrap_content"
android:orientation="horizontal"/>

<ScrollView 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"
tools:context=".DisplayResult"
scrollbars="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_horizontal">
<ImageView
android:id="#+id/zodiac1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/aries"
/>
<TextView
android:id="#+id/orTxt"
android:text="Or"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<ImageView
android:id="#+id/zodiac2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/gemini"
/>
</LinearLayout>
</ScrollView>
#If you want to Linear layout in a center you need to write android:gravity="center_horizontal" in your linear layout.