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:

Answer 1

In my case the ad didnt show up until I gave enough room for it.

Before it was like

Here the adview is having height of wrap_content, so it adjusts itself to achieve its height, but its parent (LinearLayout) has a strict height of 90dip which doesnt allow the adView to take enough space to display ads.

So what I did was just changed the height of the LinearLayout to wrap_content then things got fine