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Showing error Required XML attribute "adSize" was missing

I am implementing banner ads, but getting the error "Required XML attribute "adsize" was missing". I was using the developer.google.com link to add admob
I also visited other stackoverflow questions like as Required XML attribute 'adsize' was missing (google play service)
and I have already implemented everything but the error remains the same. Here is the code.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.abhishek.canddatastructureprograms.MainActivity">
<FrameLayout
android:id="#+id/sample_content_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<com.google.android.gms.ads.AdView
android:id="#+id/adView"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
ads:adSize="BANNER"
ads:adUnitId="#string/banner_ad_unit_id">
</com.google.android.gms.ads.AdView>
</RelativeLayout>
MainActivity.java
added the following code in onCreate() method.
AdView mAdview= (AdView) findViewById(R.id.adView);
//AdRequest mAdRequest= new AdRequest().Builder.build();
AdRequest request = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR) // All emulators
.addTestDevice("9F099BD5E5700664591DEC5FDC92A40E") // An example device ID
.build();
mAdview.loadAd(request);
Please let me know if I need to add any more details or code.

Code seems to be right. Try to remove all left and right paddings or margins, maybe you get this error because you have too small screen to show add.

No resource identifier found for attribute 'indicator_gravity' in package

I was trying to porting the Tree-View-List-Android into my project recently. I have created a project called com.dotnetideas.treeview and added everything in. I can run the demo without any issue. But when I use it in another project, I kept getting “No resource identifier found for attribute 'indicator_gravity' in package com.dotnetideas.treeview” in main_demo.xml.
Here is the xml looks like.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:treeView="http://schemas.android.com/apk/res/com.dotnetideas.treeview"
android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">
<ListView android:layout_width="0dip" android:layout_height="0dip" android:scrollbars="vertical"
android:visibility="gone"> <!-- Just to test some attributes in IDE -->
</ListView>
<pl.polidea.treeview.TreeViewList android:id="#+id/mainTreeView" android:layout_width="fill_parent"
android:layout_height="fill_parent" treeView:indicator_gravity="right|center_vertical"
android:scrollbars="vertical" android:smoothScrollbar="true"/>
Although I followed the old code to changed the xml namespace from
xmlns:treeView=http://schemas.android.com/apk/res/pl.polidea.treeview
to
xmlns:treeView=http://schemas.android.com/apk/res/com.dotnetideas.treeview.
It doesn’t seem like valid xml namespace.
It turned out that the namespace needs to be
xmlns:treeView="http://schemas.android.com/apk/res-auto"
if we reference as a library project.
This answer from stackoverflow too didnt help.

Why is there a parse error in my android layout XML?

My activity_main.xml layout file indicates an error: error parsing XML: unbound prefix. No idea why - it seems related to the AdView.
<?xml version="1.0" encoding="utf-8"?>
<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:orientation="horizontal">
<-- ERROR HERE - error parsing XML: unbound prefix -->
<com.google.android.gms.ads.AdView
android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adUnitId="ca-app-pub-xxxxxx/xxxxxx"
ads:adSize="SMART_BANNER"/>
</LinearLayout>

You forgot to define the ads prefix for the custom attributes (adSize & adUnitId).
Add to the LinearLayout container:
xmlns:ads="http://schemas.android.com/apk/res-auto"
More details here.

You may have forgotten to add this
xmlns:ads="http://schemas.android.com/apk/res-auto"
Have you also included the right library?

Admob not showing in webview

My ads are not showing, i'm trying to add them in my webview application. This is the main.xml code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<com.google.ads.AdView android:id="#+id/adView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
ads:adUnitId="a14f3ed10a5e4eb"
ads:adSize="BANNER"
ads:testDevices="TEST_EMULATOR, TEST_DEVICE_ID"
ads:loadAdOnCreate="true"/>
<WebView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/webview"
android:layout_width="fill_parent"
android:layout_height="match_parent"
/>
</LinearLayout>
Any suggestion??

you have to give the Specific ID to the addMob. Just see the Default Example on GoogleAddMob site and follow that.

Use debug mode via Eclipse and launch and Sample Ad app from the developer.android.com. In LogCat search for "To get test" with Ctrl+F and you will see the id there.
Or check this link with detailed how to:
Get ad id how to

Google AdMob error on Android

I'm using adMob sdk 4.3.1 for android and am using xml to create the layout as explained here using Eclipse IDE. The problem is that eclipse doesn't recognize the com.google.ads.AdView tag and gives the error error: error parsing XML: unbound prefix. How do I fix this?
EDIT-Here's the code for the layout file
<?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" >
<com.google.ads.AdView android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adUnitId="MY_AD_UNIT_ID"
ads:adSize="BANNER"
ads:testDevices="TEST_EMULATOR,e78b974e6ab65648b52951e69edcb571"
ads:loadAdOnCreate="true"/>
</LinearLayout>

Just add xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads" to the layout!

I'm just guessing here, you'll have to post your xml (obviously):
You're missing xmlns:android="http://schemas.android.com/apk/res/android" or you've spelt something wrong.