智能横幅广告
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作为一种广告单元，智能横幅可在任何屏幕尺寸、任何屏幕方向的各种设备上展示与屏幕等宽的横幅广告。智能横幅广告可以检测设备处于当前屏幕方向时的宽度，并据此创建与之等宽的广告视图。
智能横幅可实现三种广告高度：
| 广告高度 |
屏幕高度 |
| 32 dp |
≤ 400 dp |
| 50 dp |
> 400 dp 且 ≤ 720 dp |
| 90 dp |
> 720 dp |
通常情况下，在手机上，当屏幕为纵向时，智能横幅广告高度为 50dp；当屏幕为横向时，广告高度为 32dp。在平板电脑上，不论屏幕是纵向还是横向，广告高度通常均为 90 dp。
当图片广告不足以占据所分配的整个空间时，系统会居中放置图片，然后填充两侧剩余的空间。
要在 XML 中使用智能横幅广告，请为广告尺寸指定常量 SMART_BANNER，并将 AdView 的宽度设置为 match_parent。例如：
<com.google.android.gms.ads.admanager.AdManagerAdView
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
ads:adSize="SMART_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111">
</com.google.android.gms.ads.admanager.AdManagerAdView>
要以编程方式制作智能横幅广告，请将 AdSize.SMART_BANNER 用作广告尺寸：
Java
AdManagerAdView adView = new AdManagerAdView(this);
adView.setAdSizes(AdSize.SMART_BANNER);
Kotlin
val adView = AdManagerAdView(this)
adView.adSizes = AdSize.SMART_BANNER
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最后更新时间 (UTC)：2025-08-31。
[null,null,["最后更新时间 (UTC)：2025-08-31。"],[[["\u003cp\u003eSmart Banners are responsive ad units that automatically adjust their size to fit the width of the device screen.\u003c/p\u003e\n"],["\u003cp\u003eSmart Banners have three possible ad heights (32dp, 50dp, 90dp) depending on the screen height of the device.\u003c/p\u003e\n"],["\u003cp\u003eWhen using Smart Banners, specify \u003ccode\u003eSMART_BANNER\u003c/code\u003e as the \u003ccode\u003eadSize\u003c/code\u003e and set the \u003ccode\u003eAdView\u003c/code\u003e width to \u003ccode\u003ematch_parent\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eConsider using newer adaptive banners instead of Smart Banners for enhanced functionality.\u003c/p\u003e\n"]]],["Smart Banners display screen-width ads, adapting to device size and orientation. They use three ad heights: 32 dp (≤ 400 dp screen height), 50 dp (\u003e 400 dp and ≤ 720 dp), and 90 dp (\u003e 720 dp). To implement in XML, set `adSize` to `SMART_BANNER` and `AdView` width to `match_parent`. Programmatically, utilize `AdSize.SMART_BANNER`. Image ads are centered when smaller than the space. The content suggests using adaptive banners instead.\n"],null,["Select platform: [Android](/ad-manager/mobile-ads-sdk/android/banner/smart \"View this page for the Android platform docs.\") [iOS](/ad-manager/mobile-ads-sdk/ios/banner/smart \"View this page for the iOS platform docs.\") [Unity](/ad-manager/mobile-ads-sdk/unity/banner/smart \"View this page for the Unity platform docs.\")\n\n\u003cbr /\u003e\n\n| Try the newer [adaptive banners](/ad-manager/mobile-ads-sdk/android/banner/anchored-adaptive) instead.\n\nSmart Banners are ad units that render screen-width banner ads on any screen\nsize across different devices in either orientation. Smart Banners detect the\nwidth of the device in its current orientation and create the ad view that size.\n\nThree ad heights are implemented in smart banners:\n\n| Ad height | Screen height |\n|-----------|------------------------|\n| 32 dp | ≤ 400 dp |\n| 50 dp | \\\u003e 400 dp and ≤ 720 dp |\n| 90 dp | \\\u003e 720 dp |\n\nTypically, Smart Banners on phones have a height of 50 dp in portrait and 32 dp\nin landscape. On tablets, height is normally 90 dp in both orientations.\n\nWhen an image ad isn't large enough to take up the entire allotted space, the\nimage will be centered, and the space on either side will be filled in.\n\nTo use Smart Banners in XML, specify the constant `SMART_BANNER` for the ad\nsize and set the width of the `AdView` to `match_parent`. For example: \n\n```scdoc\n\u003ccom.google.android.gms.ads.admanager.AdManagerAdView\n xmlns:ads=\"http://schemas.android.com/apk/res-auto\"\n android:layout_width=\"match_parent\"\n android:layout_height=\"wrap_content\"\n ads:adSize=\"SMART_BANNER\"\n ads:adUnitId=\"ca-app-pub-3940256099942544/6300978111\"\u003e\n\u003c/com.google.android.gms.ads.admanager.AdManagerAdView\u003e\n```\n\nTo create a Smart Banner programmatically, use `AdSize.SMART_BANNER` as the ad\nsize: \n\nJava \n\n```java\nAdManagerAdView adView = new AdManagerAdView(this);\nadView.setAdSizes(AdSize.SMART_BANNER);\n```\n\nKotlin \n\n```kotlin\nval adView = AdManagerAdView(this)\nadView.adSizes = AdSize.SMART_BANNER\n```"]]
