移动应用中图片广告（插屏/原生）获取与展示规范及对应标准咨询

Hey folks! Let me walk you through the key guidelines for acquiring and displaying interstitial and native image ads in mobile apps, plus answer that question about standards equivalent to VAST for video ads.

• Pre-load strategically: Always pre-load interstitial ads ahead of time—don’t wait until the exact moment the user triggers a relevant scenario (like finishing a game level or exiting a screen) to request one. Use your ad platform’s dedicated pre-load methods (e.g., loadInterstitialAd()) so the ad is ready to display instantly, avoiding frustrating loading delays that harm user experience.
• Pick natural display moments: Only show interstitials during natural user pauses: after a game level completes, when a user finishes reading an article, or when they navigate away from a screen. Never pop them up mid-action (like while the user is typing, scrolling, or interacting with a button)—this is a surefire way to get your app flagged for poor UX or even rejected by app stores.
• Give users control: Include a clear, easy-to-tap close button (minimum 48x48dp to meet mobile accessibility standards) that’s impossible to miss. Most ad platforms require allowing users to close the ad within 5 seconds—don’t force them to wait longer than necessary.
• Adapt to screen sizes: Ensure ad images scale properly across different device resolutions. Avoid hardcoding dimensions; instead, use your ad platform’s adaptive rendering tools to prevent stretching, pixelation, or awkward cropping.

• Align with content loading: Request native ads in sync with your app’s content flow. For example, if you’re loading a feed of articles, batch-request native ads alongside the next set of content when the user scrolls to the bottom. This keeps the loading experience consistent and avoids jarring, out-of-sync ad loads.
• Blend seamlessly with your UI: Match the ad’s visual style exactly to your app’s native content. Use the same fonts, colors, card shapes, and spacing as your regular content cards. The only clear distinction should be a prominent "Ad" label (required by most platforms and regulations) that’s impossible to miss or obscure.
• Mirror native interactions: Make ad interactions feel identical to your app’s regular content. If tapping a native article uses a slide-in transition to the detail page, the ad’s click-through should use the same animation. Avoid custom, jarring interactions that break the user’s flow.
• Handle images consistently: Apply the same image treatments to ad assets as you do to your app’s content. If your content images use rounded corners or drop shadows, apply the same to ad thumbnails and icons. Also, implement placeholder states for when ad images fail to load—don’t leave empty spaces that look broken.

Unlike video ads which have the universal VAST standard, image ads don’t have a single global standard, but three widely adopted industry frameworks define how they’re structured, requested, and rendered:

• OpenRTB: The backbone of real-time bidding (RTB) for ads, OpenRTB includes detailed specifications for image ads—covering everything from acceptable dimensions, file formats (JPG, PNG, WebP), to placement requirements. Almost every ad exchange and demand-side platform (DSP) adheres to OpenRTB for image ad transactions.
• MRAID: Mobile Rich Media Ad Interface Definitions (MRAID) was built to standardize interactive ad behavior across apps and devices. For image ads, it defines rules for interactions like taps, swipes, and close buttons, plus how ads should render in different app environments (e.g., full-screen vs. inline).
• IMA SDK: While Google’s Interactive Media Ads (IMA) SDK is best known for video, it also supports image ads and provides a standardized workflow for requesting, rendering, and tracking ad events. Many ad platforms integrate with IMA to ensure consistent ad behavior across apps.

内容的提问来源于stack exchange，提问作者khateeb