报错信息

java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/lifecycle/DefaultLifecycleObserver;        at io.flutter.embedding.engine.FlutterEngine.<init>(FlutterEngine.java:152)        at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.setupFlutterEngine(FlutterActivityAndFragmentDelegate.java:221)        at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onAttach(FlutterActivityAndFragmentDelegate.java:145)        at io.flutter.embedding.android.FlutterActivity.onCreate(FlutterActivity.java:399)        at android.app.Activity.performCreate(Activity.java:8066)

解决方法：在app的gradle里面，添加如下依赖：

implementation "androidx.lifecycle:lifecycle-common-java8:2.2.0"

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