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How we can put Floating action button on top of any layout

I am doing some operation on floating action button . I have a list view and showing google ad at bottom of my screen, The floating action button is showing at same place (bottom|end). so action button is hiding the ad.
I want shift the Floating action button little above the ad linear layout.
Please have a look the image:
My code is look like:
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/fab_margin"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_gravity="bottom|end"
android:src="#drawable/fav"
android:adjustViewBounds="false" />
adLayoutId is ad layout id
Please help.
Thanks in advance.

You should use RelativeLayout, and as we know, later children in a RelativeLayout tend to float over earlier children in a RelativeLayout.
So, to have a FAB float over of any layout, make sure that the FAB is defined after all views (at the end of the XML layout).
If you use android:layout_margin="#dimen/fab_margin" the best way to manipulate FAB is set dependencies between views, for example:
<?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">
<ListView
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#id/adLayoutId"/>
<LinearLayout
android:id="#+id/adLayoutId"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:background="#android:color/black"/>
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#id/adLayoutId"
android:layout_alignParentRight="true"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/fav"/>
</RelativeLayout>
Floating action button always will be above the ad linear layout, and independent from ad layout size.
Hope it helps.

<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_marginBottom="100dp"
android:layout_marginRight="30dp"
/>

These two lines inside the fab button helped me solved this problem:
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
Here's the entire code I used for the button alone:
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab_newStudent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/fab_margin"
android:contentDescription="#string/todo"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:srcCompat="#drawable/ic_baseline_add_24" />

THESE TWO LINES ARE IMPORTANT.
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"

Add a bottom Margin of 55dp which is the size of Admob Banners
This line in either the floating button or enclosing layout.
android:layout_marginBottom="55dp

Floating action button always displays on top

I am trying to show textview on the top of Floating Action Button. Inside FrameLayout, I have 1 FAB and 1 TextView:
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|start"
android:padding="#dimen/fab_margin">
<android.support.design.widget.FloatingActionButton
android:id="#+id/fabAddSeller"
android:layout_width="70dp"
android:layout_height="70dp"
app:backgroundTint="#3780f4"
android:stateListAnimator="#null"/>
<TextView
android:id="#+id/tvSellRecordCount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/sell_record_counter"
android:layout_gravity="top|end"
android:text="12"
android:textColor="#FFFFFF"
android:textSize="10sp" />
</FrameLayout>
According to this answer, I have added
android:stateListAnimator="#null"
to FAB - no difference. I have put TextView after FAB - no effect.
How to show another view on top of FloatingActionButton?

In Android Studio, I could fix after adding an elevation to the text view:
android:elevation="6dp"
It seems that FAB has 5dp of elevation.
However, I'm not sure if this totally works to you since elevation is available for API>=21.
Try to make some tests in real devices...
Maybe, android:stateListAnimator="#null" is enough in real devices/emulator.
UPDATE
After adding app:elevation, this fix started to work with older APIs as well
app:elevation="6dp"
android:elevation="6dp"

Replace FrameLayout with RelativeLayout and add
<android.support.design.widget.FloatingActionButton
...
android:layout_below="#+id/tvSellRecordCount"
...
/>

How to remove grey shadow color below FloatingActionButton

I am getting light grey color below the FloatingActionButton as shown in image. Any one know how to remove it. I tested it on Lollipop version.
My xml code
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:src="#drawable/ic_add_black"
app:borderWidth="0dp"
app:fabSize="mini"
app:rippleColor="#color/colorPrimaryDark" />

Try set elevation:
app:elevation="0dp"

It happens when you set an elevation and the fab element has not space enough to display the "shadow".
Then you can set the elevation as 0dp as suggested above, or set a margin like
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_build_white_36dp"
android:id="#+id/build"
app:elevation="4dp"
android:clickable="true"
android:layout_margin="10dp"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true" />
In this way the "elevation-effect" will appear correctly

Two buttons matching parent side by side in Android (xml)

I am currently toying around with android and making a little bit of a test app just to try coding one. I'm sure there's an easy way to do this but i can't figure it out. I want two buttons to be on the bottom of the screen. But, i want one to be on the left side, and one on the right side, with space in the middle.
Thanks for the help

Like this perhaps?
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id"#+id/left_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Left"/>
<Button
android:id"#+id/right_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Right"/>
</RelativeLayout>

You need to give android:layout_alignParentLeft="true" to align left and android:layout_alignParentRight="true" to align right.
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id"#+id/left_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="Left"/>
<Button
android:id"#+id/right_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Right"/>
</RelativeLayout>

You can do that using either LinearLayout, TableLayout or RelativeLayout. Try it... it's not that hard.

Create a linear layout (inside your linerlayout which is created by default when your creating layout)
Edit your new linear layout
android:layout_gravity="bottom"
android:orientation="horizontal"
android:gravity="center"
Add two buttons inside linearlayout (add text/size also)
Optional: add both button margin_layout: 10dip
android:layout_margin="10dip"
That should do.

Android: Align button to bottom-right of screen using FrameLayout?

I am trying to put the zoom controls of the map on the bottom right corner of screen. I could do it with RelativeLayout using both alignParentBottom="true" and alignParentRight="true", but with Framelayout I did not find any such attributes. How do I align it to the bottom-right of screen?

Actually it's possible, despite what's being said in other answers. If you have a FrameLayout, and want to position a child item to the bottom, you can use android:layout_gravity="bottom" and that is going to align that child to the bottom of the FrameLayout.
I know it works because I'm using it. I know is late, but it might come handy to others since this ranks in the top positions on google

I also ran into this situation and figured out how to do it using FrameLayout.
The following output is produced by the code given below.
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/contactbook_icon"
android:layout_gravity="center" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="140"
android:textSize="12dp"
android:textColor="#FFFFFF"
android:layout_gravity="bottom|right"
android:layout_margin="15dp" />
</FrameLayout>
Change the margin value to adjust the text position over the image. Removing margin might make the text to go out of the view sometimes.

It can be achieved using RelativeLayout
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:src="#drawable/icon"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true" />
</RelativeLayout>

Setting android:layout_gravity="bottom|right" worked for me

Two ways to do this:
1) Using a Frame Layout
android:layout_gravity="bottom|right"
2) Using a Relative Layout
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"

android:layout_gravity="bottom"

If you want to try with java code. Here you go -
final LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
yourView.setLayoutParams(params);
params.gravity = Gravity.BOTTOM; // set gravity

Use bottom|right as the layout_gravity value of the element which you wish to align in the bottom right position of the parent layout.
android:layout_gravity="bottom|right"

you can add an invisible TextView to the FrameLayout.
<TextView
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:visibility="invisible"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal">
<Button
android:id="#+id/daily_delete_btn"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_weight="1"
android:text="DELETE"
android:layout_gravity="center"/>
<Button
android:id="#+id/daily_save_btn"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_weight="1"
android:text="SAVE"
android:layout_gravity="center"/>
</LinearLayout>

There are many methods to do this using constraint widget of the activity.xml page of android studio.
Two most common methods are:
Select your button view and adjust it's margins.
Go to "All attributes",then to "layout_constraints",then select
layout_constraintBottom_toBottomOf_parent
layout_constraintRight_toRightOf_parent

You can't do it with FrameLayout.
From spec:
http://developer.android.com/reference/android/widget/FrameLayout.html
"FrameLayout is designed to block out an area on the screen to display a single item. You can add multiple children to a FrameLayout, but all children are pegged to the top left of the screen."
Why not to use RelativeLayout?