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Initialization functionality unavailable for this session, in google Ads

I'm getting this error of google Ads, suddently. I can't find anything here with this error.
Notice that ads are displaying correctly
Google Mobile Ads SDK initialization functionality unavailable for this session. Ad requests can be made at any time.

Have you tried restarting your test device? It worked for me. Also if you have other apps with admob try uninstalling them since numerous calls will be made leading to the problem you are experiencing.

In my case, I solved this error by adding the following lines to my onCreate method:
MobileAds.initialize(this, new OnInitializationCompleteListener() {
#Override
public void onInitializationComplete(InitializationStatus initializationStatus) {
}
});
mAdView = findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);

Admob live ads not showing in my application,while testing ads showing

Admob Live ads are not showing, while testing ads are showing. Live ads are not showing at all, I don't know what i am missing.
Here is code.
String.java XML
<!-- Insert Id admob -->
<string name="BannerAd_unit_id">cca-app-pub-1154915214031679/2100011458</string>
<string name="InterstitialAd_unit_id">ca-app-pub-1154915214031679/9049914448</string>
MainGame.Java Class
this.BANNER_AD_UNIT_ID = getResources().getString(R.string.BannerAd_unit_id);
showBanner();
screen java.class
public void showBanner() {
//banner ad
if (BANNER_AD_UNIT_ID.length() > 0) {
// Create an ad.
adView = new AdView(this);
adView.setAdSize(AdSize.BANNER);
adView.setAdUnitId(BANNER_AD_UNIT_ID);
//make ad visible on bottom of screen
RelativeLayout.LayoutParams params1 = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params1.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
params1.addRule(RelativeLayout.CENTER_HORIZONTAL);
adView.setLayoutParams(params1);
layout.addView(adView);
// Create an ad request. Check logcat output for the hashed device ID to
// get test ads on a physical device.
AdRequest adRequest = new AdRequest.Builder()
//.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
//.addTestDevice("C01834A0B4A8FA4C03A0E09605F43819")//GalaxyS4*/
.build();
// Start loading the ad in the background.
adView.loadAd(adRequest);
}
}
If I Remove comment ".addTestDevice" Then testing ads are showing, if I comment it then live ads not showing. I don't know what is going on, any help will be appreciated.

If you're not receiving real ads, but are receiving 'test ads' then the implementation should be ok.
If you just created the ad account, it takes a few hours until real ads will appear and sometimes there might be no adds available to show.
Set an adListener to your adView and see what you're getting back. It might be a ERROR_CODE_NO_FILL or it might give you other hints to solve the problem.

Make sure you have updated AdMob with your payment details (go to Payments Section for that).
Check your AdMob dashboard to see the status of your ads to check if they are active.
Verify you used the correct Ad Unit Id.
After you update your info, it may take up to 24 hours to verify your information. After verification, they will enable your ad serving. You will get an email notification saying your ads are now being served.

If the test ads are working fine then your implementation is correct, but there is an option of "Payment" in the admob account which you need to fill. After filling up that form you will receive an email regarding the confirmation of payment details and message indicating that whether your information was accepted by the admob team or not if yes then your live ads will be showing up. But keep in mind that for the first few time the ad won't show up. it takes time to appear after the approval as well.
Here is the code snippet for the error code to find what is going wrong
mAdView = (com.google.android.gms.ads.AdView) findViewById(R.id.adView);
mAdView.setAdListener(new com.google.android.gms.ads.AdListener() {
#Override
public void onAdLoaded() {
// Code to be executed when an ad finishes loading.
Toast.makeText(HomeActivity.this, "onAdLoaded", Toast.LENGTH_SHORT).show();
}
#Override
public void onAdFailedToLoad(int errorCode) {
if(errorCode==AdRequest.ERROR_CODE_INTERNAL_ERROR)
Toast.makeText(HomeActivity.this, "onAdFailedToLoad", Toast.LENGTH_SHORT).show();
// Code to be executed when an ad request fails.
}
#Override
public void onAdOpened() {
Toast.makeText(HomeActivity.this, "onAdOpened", Toast.LENGTH_SHORT).show();
}
#Override
public void onAdLeftApplication() {
Toast.makeText(HomeActivity.this, "onAdLeftApplication", Toast.LENGTH_SHORT).show();
}
#Override
public void onAdClosed() {
Toast.makeText(HomeActivity.this, "onAdClosed", Toast.LENGTH_SHORT).show();
}
})
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
Get the error code:
ERROR_CODE_INTERNAL_ERROR - Something happened internally; for instance, an invalid response was received from the ad server.
ERROR_CODE_INVALID_REQUEST - The ad request was invalid; for instance, the ad unit ID was incorrect.
ERROR_CODE_NETWORK_ERROR - The ad request was unsuccessful due to network connectivity.
ERROR_CODE_NO_FILL - The ad request was successful, but no ad was returned due to lack of ad inventory.

Admob Not showing ads on real devices only showing on Test devices only

private void showInterstitialadd() {
mInterstitialAd = new InterstitialAd(MainActivity.this);
// set the ad unit ID
mInterstitialAd.setAdUnitId(getString(R.string.interstitial_full_screen));
AdRequest adRequest = new AdRequest.Builder()
.build();
// Load ads into Interstitial Ads
mInterstitialAd.loadAd(adRequest);
mInterstitialAd.setAdListener(new AdListener() {
public void onAdLoaded() {
showInterstitial();
}
});
}
private void showInterstitial() {
if (mInterstitialAd.isLoaded()) {
mInterstitialAd.show();
}
}
I am using the above function for showing Ads....and its working absolutely fine on my test device but when I remove that .addTestdevice().....and run on any other devices it does not shows up....

There may be no issue in your code but AdMob doesn't show ads on real device quickly. You have to wait for few days. Before that, you have to enter some details like address and payment account detail in your AdMob account.
Don't worry they guide via email.
After you enter details, wait for few days, you will be notified in AdMob account that ads are showing.
In my case, it takes 2 days and, only Banner and Interstitial ads were activated at that time and video ads still do not get loaded.
So if ads are showing on test device then it will also be showing in the real device. The only thing you have to do is complete AdMob account setup and wait.
Also, don't forget to remove .addTestdevice() code before checking on real device.

How google ads are shown on Android?

I did some testing with ads on my device and then pushed app to the play with with production unit ID. After a while when the version was available on play I deleted the debug build from my device and installed from playstore .
The code is same as what developer site suggests
mInterstitialAd = new InterstitialAd(callerActivity);
mInterstitialAd.setAdUnitId(callerActivity.getString(R.string.interstitial_ad_unit_id));
AdRequest adRequest = new AdRequest.Builder().build();
mInterstitialAd.loadAd(adRequest);
if (mInterstitialAd.isLoaded()) {
Log.i(TAG," Interstitial Add :Loaded");
mInterstitialAd.show();
}
else {
Log.i(TAG,"Could not load Interstitial Add");
}
But surprisingly I see following in logs
2:38.743 16617-16617/com.osfg.tictactoe I/Ads﹕ Starting ad request.
06-17 18:22:38.743 16617-16617/com.osfg.tictactoe I/Ads﹕ Use AdRequest.Builder.addTestDevice("235F7FAA8F49FF2CAA1DD2FAFE6B9E8A") to get test ads on this device.
06-17 18:22:40.529 16617-16617/com.osfg.tictactoe I/GamePlayOnClickListener﹕ Game Over. Some player won
06-17 18:22:43.551 16617-16617/com.osfg.tictactoe I/GamePlayOnClickListener﹕ Could not load Interstitial Add
06-17 18:22:43.551 16617-16617/com.osfg.tictactoe I/GamePlayOnClickListener﹕ Resetting game
It is still using my device as test device? Not sure what is happening here. Anyone has any prior experience on this? I know it calculates the hash but does it store it on admob server but again this is client call. How would it know? I am confused. Any suggestion is appreciated.

Most likely you're encountering this issue because mInterstitialAd.loadAd(adRequest); is calling a background thread to load a new ad, but you're checking to see if the ad has been loaded immediately. You don't give that background thread a chance to connect to the server, get the ad, etc.
To fix this, you need to place your code for when the ad has been loaded inside an AdListener, like so:
mInterstitialAd.setAdListener(new AdListener() {
#Override
public void onAdLoaded() {
Log.i(TAG," Interstitial Add :Loaded");
}
#Override
public void onAdFailedToLoad(int error) {
Log.i(TAG,"Could not load Interstitial Add");
}
}
mInterstitialAd.loadAd(adRequest);
The if statement if (mInterstitialAd.isLoaded()) is for checking at a later time if the ad has been loaded, such as after the user does some action. Not when an activity begins or anything similar.

onFailedToRecieveAd(Invalid Ad Request) message with AdMob

I've been trying to get AdMob to work for some time on my app. I keep getting onFailedToRecieveAd(Invalid Ad Request) message in the log. I've paired down my test application to this:
AdView adView;
LinearLayout ll;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
adView = new AdView(this, AdSize.BANNER, "pub-2...............");//inserted my 16 digit pub id here
adView.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
ll.addView(adView);
setContentView(ll);
AdRequest adRequest = new AdRequest();
adRequest.addTestDevice("3...............");// 16 digits, tried other strings as
// follows:
//for addTestDevice I've tried several numbers, including the 16 digit device
// number given me by my "device id" application, the "0123456789ABCDEF" device number
// given by my console and device windows, the "CECE.........................." 32 digit
// device number my logcat file told me to use in a logcat message,
// "AdRequest.TEST_EMULATOR"
// which an admob example in the docs said to use, "9774d56d682e549c" which another
// admob docs example said to use.
adView.loadAd(adRequest);
I've also tried adView.loadAd(new AdRequest()); using no device id as in another one of the google admob example apps.
nothing has worked to show anything, it's not even creating space for the ad, just the onFailedToRecieveAd(Invalid Ad Request) message in the logcat
I've also included the necessary permissions and "com.google.ads.AdActivity" in the manifest.

Wow, after days of frustration and posts to various forums I've found the answer.
You have to go to your account on the Admob website to set up your specific app for the admob ads and get a new longer publisher number. My publisher number only started with 'pub-......' where my new number is longer and starts with 'ca-app-pub-.......'. I was curious about this from the start when I saw the 'ca-app-pub' preface in an example banner ap.
Nowhere on the Google Admob "Google Mobile Ads SDK" development site in the "banner ads 1" instructions (https://developers.google.com/mobile-ads-sdk/docs/admob/fundamentals?hl=en_US#android) does it mention having to go back to your admob account to set up your specific app for ads and get a new publisher number.
The stupid mistakes are the hardest to fix.

Be carefull with the id, there are 2 codes: the editor number (like this: pub-xxxxxxxxxxxxxxxx) and the other is the banner id (like this: ca-app-pub-xxxxxxxxxxxxxxxx/xxxxxxxxxx) (this one you need to use)
You need to use the last one, if you use the first doesnt work:)

It is not unusual to get a failed to receive ad. This is a normal message essentially saying that there are no ads to serve for your app at this point in time.
It means that your Admob integration is working, you are getting a response back from the server. As your app sends more requests it will be more likely to receive ad impressions.

Have you tried requesting an ad without setting the test device ID?
adView.loadAd(new AdRequest());
Try adding the following lines of code to get more info about the failure:
// Set AdListener
adView.setAdListener(new AdListener() {
#Override
public void onFailedToReceiveAd(Ad ad, ErrorCode error) {
System.err.println("Ad failed: " + ad.toString() + error.toString());
}
#Override
public void onReceiveAd(Ad ad) {
System.out.println("Ad received: " + ad.toString());
}
});