title: admob LARGE_BANNER 0% fill rate
body: <p>I was having serious problems with my admob match rate on android, so i decided to fine debug what was happening...</p>
  
  <p>Among many problems i found, i noticed the match rate of <code>LARGE_BANNER</code> AdSize is near 0%</p>
  
  <p>I did a simple test... create a test layout with all possible banner sizes for smartphones, all with same adunit and loaded all banners exactly same way</p>
  
  <p>the result was only LARGE_BANNER got empty most of the times</p>
  
  <p>Activity:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:gravity="center"
      android:orientation="vertical"&gt;
  
      &lt;Button
          android:id="@+id/b1"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="b1" /&gt;
  
      &lt;Button
          android:id="@+id/b2"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="b2" /&gt;
  
      &lt;ScrollView
          android:layout_width="match_parent"
          android:layout_height="0dp"
          android:layout_weight="1"&gt;
  
          &lt;LinearLayout
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:orientation="vertical"&gt;
  
              &lt;TextView
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="BANNER" /&gt;
  
              &lt;com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
                  android:id="@+id/banner"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_marginBottom="@dimen/smallMargin"
                  ads:adSize="BANNER"
                  ads:adUnitId="@string/banner_ad_unit_id" /&gt;
  
  
              &lt;TextView
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="SMART_BANNER" /&gt;
  
  
              &lt;com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
                  android:id="@+id/smartBanner"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_alignParentBottom="true"
                  android:layout_centerHorizontal="true"
                  android:layout_marginBottom="@dimen/smallMargin"
                  ads:adSize="SMART_BANNER"
                  ads:adUnitId="@string/banner_ad_unit_id" /&gt;
  
  
              &lt;TextView
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="LARGE_BANNER" /&gt;
  
  
              &lt;com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
                  android:id="@+id/largeBanner"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_alignParentBottom="true"
                  android:layout_centerHorizontal="true"
                  android:layout_marginBottom="@dimen/smallMargin"
                  ads:adSize="LARGE_BANNER"
                  ads:adUnitId="@string/card_ad_unit_id" /&gt;
  
              &lt;TextView
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="MEDIUM_RECTANGLE" /&gt;
  
  
              &lt;com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
                  android:id="@+id/rectangle"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_alignParentBottom="true"
                  android:layout_centerHorizontal="true"
                  ads:adSize="MEDIUM_RECTANGLE"
                  ads:adUnitId="@string/busy_ad_unit_id" /&gt;
  
  
          &lt;/LinearLayout&gt;
      &lt;/ScrollView&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>code:
  private void loadAds() {</p>
  
  <pre><code>    ((AdView) findViewById(R.id.banner)).loadAd(new AdRequest.Builder().build());
      ((AdView) findViewById(R.id.smartBanner)).loadAd(new AdRequest.Builder().build());
      ((AdView) findViewById(R.id.rectangle)).loadAd(new AdRequest.Builder().build());
      ((AdView) findViewById(R.id.largeBanner)).loadAd(new AdRequest.Builder().build());
  
  }
  </code></pre>
  
  <p>result:</p>
  
  <p><a href="https://i.stack.imgur.com/QOoEb.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QOoEb.jpg" alt="enter image description here"></a></p>
  
  <p>is there any explanation for that</p>