AdMob banner ad not showing

Question

I am using admob in my app, it was working fine but suddenly it stopped showing ads at all. Bellow is my codes i used:

mainActivity.xml:

<com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        ads:adSize="BANNER"
        ads:adUnitId="@string/banner_ad_unit_id">
    </com.google.android.gms.ads.AdView>

MainActivity.java

        AdView mAdView = (AdView) findViewById(R.id.adView);

        AdRequest adRequest = new AdRequest.Builder().build();

        mAdView.loadAd(adRequest);

AndroidManifest:

 <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="19" />

 <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

<meta-data android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />  

<!--Include the AdActivity configChanges and theme. -->
<activity android:name="com.google.android.gms.ads.AdActivity"
            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
            android:theme="@android:style/Theme.Translucent" />

I followed all the instructions from adMob site as i said it was working few days ago.

Bellow are few line from logcat which may be related to my issue:

09-25 22:44:50.292: E/dalvikvm(18554): Could not find class 'android.app.AppOpsManager', referenced from method com.google.android.gms.common.GooglePlayServicesUtil.zza

---

09-25 22:45:07.209: E/Ads(18554): JS: Uncaught ReferenceError: renderAd is not defined (https://googleads.g.doubleclick.net/mads/gma:1)
09-25 22:45:07.209: E/Web Console(18554): Uncaught ReferenceError: renderAd is not defined:1
09-25 22:45:07.209: E/Ads(18554): JS: Uncaught ReferenceError: onLoad is not defined (https://googleads.g.doubleclick.net/mads/gma:1)
09-25 22:45:07.209: E/Web Console(18554): Uncaught ReferenceError: onLoad is not defined:1

---

I get bellow warning repeatedly and it appears more when i click the blank area where ad should be showing

09-25 22:46:10.911: W/PicturePileLayerContent(18554): Warning: painting PicturePile without content!

---

This is filtered logcat with "ads"

09-25 23:39:25.948: I/Ads(28874): Starting ad request.
09-25 23:39:25.948: I/Ads(28874): Use AdRequest.Builder.addTestDevice("8FCD71CAAE776558876AAA9BA964245A") to get test ads on this device.

09-25 23:39:26.919: I/Ads(22050): App index is not enabled
09-25 23:39:30.432: E/Ads(28874): JS: Uncaught ReferenceError: renderAd is not defined (https://googleads.g.doubleclick.net/mads/gma:1)
09-25 23:39:30.442: E/Ads(28874): JS: Uncaught ReferenceError: onLoad is not defined (https://googleads.g.doubleclick.net/mads/gma:1)
09-25 23:39:30.442: I/Ads(28874): Scheduling ad refresh 60000 milliseconds from now.
09-25 23:39:30.472: I/Ads(28874): Ad finished loading.

I have searched everywhere for the solution and also looked at some similar but non of them helped me.

Answer 1

This problem is solved by uninstalling the app manually and reinstalling again without making any changes!!

Answer 2

In my case, I had the code below under the buildscript section of the project level build.gradle

Make sure maven {url "https://maven.google.com"} is under allProjects > repositories:

allprojects {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}