Develop Reference

banner ads disappear from android application

I published an android application and it has banner ads.
when application published on google play store banner ads display in application but after one week banner ads disappears.
what is the problem then ? and how to solve it ?

Most probably, admob has placed limits on your account. If your app is new, this is not uncommon. Make sure the implementation of your app is correct (for ads), and wait for a few days. If you are not indulged in any activities that violate Google's ad policies, the ads will start displaying again. It may take upto a month. Also, please consider reading about things on the web first before asking on StackOverflow

Banner ads will only show on App installed through Play Store and wait for a minute to let it load ads(this solved the above described problem once that I was too facing)

How to replace my ads on an android app without giving update to a users

So i'm completely new to android apps. I have build my own web-view application of my website. I have seen some tutorials on YouTube about putting up Admob in an app but i have few question on that
If i put Admob code in my app and later if i want to shift to
another ad company. Do i need to replace it inside my application and
upload it again in Google play store?
If yes, then the person who never update an app wont receive my new ad company ads?
Can we put some code inside the app like we put iframe in html pages from which can change ad codes etc without uploading it again on Google Play Store?
Please answers these question
Thank you

First Solution: Add mediation to your Admob Ads.
Second Solution: Fectch a value from database on cloud (ex:Realtime Database) and according to that value, setup ads with proper ad network sdk.
NOTE:
Both option needs you to integrate another networks SDK or at least mediation adapters just as you imported admob sdk. This leads to increase in app size.
Second option requires you to to extra work.

Android Interstitial video ads

I just finished my app, a tool that you use for about 5min and then export, so I have considered to show a video ad before each exportation. The debate begins here, which ad company is better? I like Admob because I have other apps with banners and it's very confortable to have all I need in one web.
But I read that Admob is not the better one and I've heard too that with interstitial video ads you get the same revenues that with interstitial image ads, it's that true?
Thanks in advance

Don't choose now.
Pick 3 contenders. Deploy you app with the SDK for all 3, and use mediation (such as Admob's) in order to flick between them. Then you can try all 3 by switching between them using the mediation web console without needing to redeploy.
I suspect you will want more than one anyway as they don't always have ads available in all regions at all times, so you are going to want to use mediation anyhow.
And don't ask which 3 - that is not a question for this site.

Admob implementation for Android

I want to implement admob ads on my apps, but I didn't find any good resources to reference it.
I went to http://code.google.com/mobile/ads/docs/android/fundamentals.html but It only give me the implementation for testing device. How about to I want to see my apps show real ads.
Edit : I have my account at Admob, and had downloaded the SDK, but there's no real ads example there.
So please don't suggest me to register or something

The implementation for test ads and live ads are virtually the same. The only lines you should add/remove to get test/live ads are:
AdRequest.addTestDevice(AdRequest.TEST_EMULATOR);
AdRequest.addTestDevice("INSERT_YOUR_HASHED_DEVICE_ID_HERE");
The first line will give you test ads on the emulator, the second would give you test ads on a specific device, provided you put in the correct device id, which you could get from the logcat output. If these lines are removed from the code, live ads will be served.
Note it is good practice to use test ads during development.

You go to Admob website register
Then add a new add campaign to show adds in your app.
Wait for admob to approve it, and start showing adds.
Everything you need you can learn by googling tutorials about how to use it.
Here is a good place to start.
Abmob for beginners

AdMob Ads not displaying

I'm adding AdMob ads (say that five times fast) to my finished, published Android app. I added the code from the PDF included with AdMob, following their instructions to a tee. The test ads show up fine on my emulators and specified test devices. They just don't appear in the published marketplace app when you download and run it. I still get impressions on my AdMob page however. Any ideas?

Admob sometimes doesn't have ads to display. This is worse for some apps than others. There are a few things to do to help mitigate this problem:
Enable adsense ads - this gives a larger pool of ads
Ensure that you have house ads available for all of your apps in Admob. That way, if they can't find paying ads, they'll at least show your house ads. This will significantly raise your fill rate, but not directly raise your income (depends on what you do with the house ads).

I know that the admob code does not display anything until it connects to the server and receives an ad. In my app it can take several seconds for the ad to display, but not usually longer than that.

I notice this fairly often with admob on one of my apps, while another seems to serve up ads just fine. Can't figure it out either, but I suspect it has to do with AdMob not having any campaigns that tailor to your application description and keywords.

I'm seeing exactly the same behavior. Does your app perform any network tasks on startup? If so, here is a thread on admob's support group which might provide an explanation:
https://groups.google.com/d/topic/admob-publisher-discuss/hR7zs_GBSRw/discussion
Unfortunately for me delaying my app's network activity while waiting for admob isn't really an option, so I wish admob/google would release a fix.