Admob adBanner not shown in android application, Failed to Load AD

Question

Banner ads from AdMob has been added in the application both in XML and code but while running the application in the external device ,the banner Ad is not shown and the below error is shown in logcat.

NB: Googled this issue many times but not found any appropriate solution for this problem. Updated the google play service but that not solved the issue.

<?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="wrap_content"
        android:orientation="vertical"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_centerInParent="true"
        >

        <android.support.design.widget.TextInputLayout
            android:id="@+id/username_textinput"
            android:layout_width="match_parent"
            android:padding="5dp"
            android:layout_marginTop="15dp"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/edittext_agentid"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:textColor="@android:color/black"
                android:ems="5"
                android:hint="User name"
                android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
                android:imeOptions="actionNext"
                android:singleLine="true"
                android:textColorHint="#000000"/>


        </android.support.design.widget.TextInputLayout>



        <android.support.design.widget.TextInputLayout
            android:id="@+id/edittext_textinput"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:padding="5dp">

            <EditText
                android:id="@+id/edittext_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:ems="5"
                android:hint="Password"
                android:imeOptions="actionDone"
                android:inputType="textPassword"
                android:singleLine="true"
                android:textColor="@android:color/black"
                android:textColorHint="#000000" />
        </android.support.design.widget.TextInputLayout>


        <Button
            android:layout_marginTop="30dp"
            android:id="@+id/button_login"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="LOGIN"
            android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
            android:paddingLeft="40dp"
            android:paddingRight="40dp"
            android:textColor="#ffffff"
            android:layout_gravity="center"
            android:background="@color/colorAccent"/>

    </LinearLayout>
<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true">

    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        ads:adSize="SMART_BANNER"
        ads:adUnitId="@string/banner_home_footer">
    </com.google.android.gms.ads.AdView>
</LinearLayout>
</RelativeLayout>

This is the adrequest code in the activity

adview=(AdView)findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
adview.loadAd(adRequest);

While running the application this is the error in logcat. /Ads: There was a problem getting an ad response. ErrorCode: 0 W/Ads: Failed to load ad: 0

Answer 1

Test ads as tester

adview=(AdView)findViewById(R.id.adView);
AdRequest adRequest = new 
AdRequest.Builder().addTestDevice("your id").build();
adview.loadAd(adRequest);

After run the app... Go in Logcat put in Verbose put in the search field AdRequest, so the id device shows donw.