Load Drawable can block main thread for over 1 second

[Benjamin Romano]

Background
We recently added some instrumentation to our app that detects our main thread blocked for >700ms (Android's Frozen Frame definition). We observed that one of our top issues causing main thread blockages / frozen frames is Glide's image loading.

Issue
We are observing that Glide can periodically cause the main thread to get stuck for ~1.5s seconds and in the worst case results in ANRs.

It appears to be an issue primarily on Android versions 9, 10 and 11. From internal data, I don't see anything that indicates that this is device model / OEM-specific.

It's probably unlikely there is enough info to root cause, but this report may help future developers who run into similar problems.

Example Stacktraces

These are the top stacktraces roughly in-order of occurence

	at android.content.res.AssetManager.nativeSetApkAssets(Native Method)
	at android.content.res.AssetManager.access$300(AssetManager.java:64)
	at android.content.res.AssetManager$Builder.build(AssetManager.java:161)
	at android.app.ResourcesManager.createAssetManager(ResourcesManager.java:435)
	at android.app.ResourcesManager.originalCreateResourcesImpl(ResourcesManager.java:529)
	at android.app.ResourcesManager.createResourcesImpl(ResourcesManager.java:520)
	at android.app.ResourcesManager.getOrCreateResources(ResourcesManager.java:831)
	at android.app.ResourcesManager.getResources(ResourcesManager.java:897)
	at android.app.ContextImpl.createResources(ContextImpl.java:2147)
	at android.app.ContextImpl.createConfigurationContext(ContextImpl.java:2254)
	at android.content.ContextWrapper.createConfigurationContext(ContextWrapper.java:919)
	at android.content.ContextWrapper.createConfigurationContext(ContextWrapper.java:919)
	at androidx.appcompat.view.ContextThemeWrapper.getResourcesInternal(ContextThemeWrapper.java)
	at androidx.appcompat.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java)
	at androidx.appcompat.widget.ResourceManagerInternal.createDrawableIfNeeded(ResourceManagerInternal.java)
	at androidx.appcompat.widget.ResourceManagerInternal.getDrawable(ResourceManagerInternal.java)
	at androidx.appcompat.widget.ResourceManagerInternal.getDrawable(ResourceManagerInternal.java)
	at androidx.appcompat.content.res.AppCompatResources.getDrawable(AppCompatResources.java)
	at com.bumptech.glide.load.resource.drawable.DrawableDecoderCompat.loadDrawableV7(DrawableDecoderCompat.java)
	at com.bumptech.glide.load.resource.drawable.DrawableDecoderCompat.getDrawable(DrawableDecoderCompat.java)
	at com.bumptech.glide.load.resource.drawable.DrawableDecoderCompat.getDrawable(DrawableDecoderCompat.java)

	at android.hardware.display.DisplayManagerGlobal.getDisplayInfo(DisplayManagerGlobal.java:233)
	at android.hardware.display.DisplayManagerGlobal.getCompatibleDisplay(DisplayManagerGlobal.java:382)
	at android.app.ResourcesManager.getAdjustedDisplay(ResourcesManager.java:458)
	at android.app.ContextImpl.getDisplayNoVerify(ContextImpl.java:3206)
	at android.app.ContextImpl.getDisplayId(ContextImpl.java:3215)
	at android.app.ContextImpl.createConfigurationContext(ContextImpl.java:2885)
	at android.content.ContextWrapper.createConfigurationContext(ContextWrapper.java:1153)
	at android.content.ContextWrapper.createConfigurationContext(ContextWrapper.java:1153)
	at androidx.appcompat.view.ContextThemeWrapper.getResourcesInternal(ContextThemeWrapper.java)
	at androidx.appcompat.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java)
	at androidx.appcompat.widget.ResourceManagerInternal.c(ResourceManagerInternal.java:15)
	at androidx.appcompat.widget.ResourceManagerInternal.getDrawable(ResourceManagerInternal.java)
	at androidx.appcompat.widget.ResourceManagerInternal.getDrawable(ResourceManagerInternal.java)
	at androidx.appcompat.content.res.AppCompatResources.getDrawable(AppCompatResources.java)
	at com.bumptech.glide.load.resource.drawable.DrawableDecoderCompat.loadDrawableV7(DrawableDecoderCompat.java)
	at com.google.android.gms.internal.mlkit_vision_common.zzjm.j(com.google.mlkit:vision-common@@17.3.0:5)
	at com.bumptech.glide.load.resource.drawable.DrawableDecoderCompat.getDrawable(DrawableDecoderCompat.java)

	at android.app.ContextImpl.getTheme(ContextImpl.java:310)
	at android.content.ContextWrapper.getTheme(ContextWrapper.java:125)
	at com.bumptech.glide.request.SingleRequest.loadDrawable(SingleRequest.java)
	at com.bumptech.glide.request.SingleRequest.getPlaceholderDrawable(SingleRequest.java)
	at com.bumptech.glide.request.SingleRequest.begin(SingleRequest.java)
	at com.bumptech.glide.manager.RequestTracker.runRequest(RequestTracker.java)
	at com.bumptech.glide.RequestManager.track(RequestManager.java)
	at com.bumptech.glide.RequestBuilder.into(RequestBuilder.java)
	at com.bumptech.glide.RequestBuilder.into(RequestBuilder.java)
	at com.bumptech.glide.RequestBuilder.into(RequestBuilder.java)
	at com.snap.imageloading.internal.glide4.impl.Glide4ImageView$loadBitmap$1.run(Glide4ImageView.java)
	at com.snap.framework.rx.RxExtensions$toSafe$1.run(RxExtensions.java)
	at com.snap.taskexecution.scheduling.AttributedHandlerScheduler.runWorkerScheduledRunnable(AttributedHandlerScheduler.java)
	at android.os.Handler.handleCallback(Handler.java:809)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:166)