Steps to Reproduce

Built a flutter app and tested it on Android device with OS version 4.4.x and Android API level 19.
Firebase crash reporter caught NoClassDefFoundError.

Logs

From Firebase crash report.

Exception java.lang.NoClassDefFoundError: android.view.accessibility.AccessibilityNodeInfo$AccessibilityAction io.flutter.view.AccessibilityBridge.createAccessibilityNodeInfo (AccessibilityBridge.java:136) android.view.AccessibilityInteractionController$AccessibilityNodePrefetcher.prefetchDescendantsOfVirtualNode (AccessibilityInteractionController.java:917) android.view.AccessibilityInteractionController$AccessibilityNodePrefetcher.prefetchDescendantsOfRealNode (AccessibilityInteractionController.java:838) android.view.AccessibilityInteractionController$AccessibilityNodePrefetcher.prefetchDescendantsOfRealNode (AccessibilityInteractionController.java:834) android.view.AccessibilityInteractionController$AccessibilityNodePrefetcher.prefetchDescendantsOfRealNode (AccessibilityInteractionController.java:834) android.view.AccessibilityInteractionController$AccessibilityNodePrefetcher.prefetchAccessibilityNodeInfos (AccessibilityInteractionController.java:720) android.view.AccessibilityInteractionController.findAccessibilityNodeInfoByAccessibilityIdUiThread (AccessibilityInteractionController.java:147) android.view.AccessibilityInteractionController.access$300 (AccessibilityInteractionController.java:49) android.view.AccessibilityInteractionController$PrivateHandler.handleMessage (AccessibilityInteractionController.java:971) android.os.Handler.dispatchMessage (Handler.java:102) android.os.Looper.loop (Looper.java:157) android.app.ActivityThread.main (ActivityThread.java:5633) java.lang.reflect.Method.invokeNative (Method.java) java.lang.reflect.Method.invoke (Method.java:515) com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:896) com.android.internal.os.ZygoteInit.main (ZygoteInit.java:712) dalvik.system.NativeStart.main (NativeStart.java)

Flutter Doctor

Sorry, will add this later today

Troubleshooting

Below seems to be triggering the crash

1. Android AccessibilityNodeInfo.AccessibilityAction fields were available from Android API 21 onwards

2. Flutter Engine calls on the AccessibilityNodeInfo Android API but misses error handling for Android API levels below 21.