1. \u6ce8\u518c\u6d41\u7a0b final LifecycleRegistry mFragmentLifecycleRegis […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,8],"tags":[],"class_list":["post-462","post","type-post","status-publish","format-standard","hentry","category-android","category-8"],"yoast_head":"\nfinal LifecycleRegistry mFragmentLifecycleRegistry = new LifecycleRegistry(this);<\/code><\/p>\n@Override\npublic void addObserver(@NonNull LifecycleObserver observer) {\n \/\/ \u53ef\u4ee5\u8ba9\u521a\u6ce8\u518c\u7684\u53ef\u4ee5\u83b7\u53d6\u5148\u524d\u7684\u56de\u8c03\uff0c\u5728\u4e0b\u9762\u7684while\u5faa\u73af\n State initialState = mState == DESTROYED ? DESTROYED : INITIALIZED;\n \/\/ observer\u7684\u8f6c\u5316\u6d41\u7a0b\u5728\u8fd9\u91cc\uff0c\u8fd9\u4e00\u6b65\u8d70\u5b8c\u5c31\u5df2\u7ecf\u5c06LifecycleObserver\u8f6c\u6362\u4e3aLifecycleEventObserver\u4e86\uff0c\n \/\/ \u5176\u5185\u90e8\u4f1a\u6839\u636e\u6761\u4ef6\u751f\u6210\u591a\u4e2a LifecycleEventObserver\u7684\u5b50\u7c7b\u8fdb\u884creturn\uff0c\u6700\u7ec8\u5373\u4e3a\u7edf\u4e00\u4e3a\uff1aLifecycleEventObserver\n ObserverWithState statefulObserver = new ObserverWithState(observer, initialState);\n ObserverWithState previous = mObserverMap.putIfAbsent(observer, statefulObserver);\n \/\/ \u91cd\u590d\u6dfb\u52a0\uff0c\u76f4\u63a5\u8fd4\u56de\n if (previous != null) {\n return;\n }\n \/\/ \u5224\u7a7a\n LifecycleOwner lifecycleOwner = mLifecycleOwner.get();\n if (lifecycleOwner == null) {\n return;\n }\n\n \/\/ \u662f\u5426\u91cd\u5165\n boolean isReentrance = mAddingObserverCounter != 0 || mHandlingEvent;\n State targetState = calculateTargetState(observer);\n mAddingObserverCounter++;\n \/\/ ********* \u91cd\u8981 ********\n \/\/ \u6b64\u65f6statefulObserver.mState \u7684\u521d\u59cb\u503c\u4e3a \n \/\/ INITIALIZED \uff0c\u901a\u8fc7\u4e0e\u8ba1\u7b97\u51fa\u7684 targetState \u6bd4\u8f83\uff0c\n \/\/ \u5c0f\u4e8e\u7684\u8bdd\uff0c\u5c31\u8fdb\u5165\u5faa\u73af\u3002\n \/\/ \uff08DESTROYED\u662f\u6700\u5c0f\u7684\uff0cINITIALIZED\u6bd4DESTROYED\u5927\uff0cCREATED\u6bd4INITIALIZED\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff09\n while ((statefulObserver.mState.compareTo(targetState) < 0\n && mObserverMap.contains(observer))) {\n \/\/ \u5c06\u81ea\u8eab\u72b6\u6001\u5b58\u8d77\u6765\n pushParentState(statefulObserver.mState);\n \/\/ \u5206\u53d1Event\n statefulObserver.dispatchEvent(lifecycleOwner, upEvent(statefulObserver.mState));\n \/\/ \u5c06\u81ea\u8eab\u72b6\u6001\u5220\u6389\n popParentState();\n \/\/ \u91cd\u65b0\u8ba1\u7b97\u72b6\u6001\uff0c\u7528\u4e8e\u5faa\u73af\u9000\u51fa\u6761\u4ef6\uff1a\u76f4\u5230observer\u7684\u72b6\u6001\u4eceINITIALIZED\u7684\u72b6\u6001\u9012\u8fdb\u5230\u5f53\u524dLifecyleOwner\u7684\u72b6\u6001\n targetState = calculateTargetState(observer);\n }\n\n \/\/\u5982\u679c\u91cd\u5165\u7684\u8bdd\u6ca1\u6709\u5fc5\u8981\u6bcf\u6b21\u90fd\u540c\u6b65\uff0c\u6d6a\u8d39\u8d44\u6e90\uff0c\u53ea\u9700\u8981\u5728\u6700\u540e\u4e00\u6b21\u5904\u7406\u5b8c\u6240\u6709\u4efb\u52a1\u4e4b\u540e\u540c\u6b65\u4e00\u6b21\u5373\u53ef\n if (!isReentrance) {\n \/\/\u66f4\u65b0\u4e00\u4e9b\u5c5e\u6027\uff0c\u5e76\u5206\u53d1event\n sync();\n }\n mAddingObserverCounter--;\n}\n<\/code><\/pre>\n2. \u901a\u77e5\u6d41\u7a0b<\/h5>\n
2.1 ComponentActivity<\/h6>\n
\/\/ ComponentActivity\n@Override\nprotected void onCreate(@Nullable Bundle savedInstanceState) {\n mSavedStateRegistryController.performRestore(savedInstanceState);\n mContextAwareHelper.dispatchOnContextAvailable(this);\n super.onCreate(savedInstanceState);\n ReportFragment.injectIfNeededIn(this);\n if (mContentLayoutId != 0) {\n setContentView(mContentLayoutId);\n }\n}\n<\/code><\/pre>\n2.1 ReportFragment<\/h6>\n
\/\/ ReportFragment\npublic static void injectIfNeededIn(Activity activity) {\n if (Build.VERSION.SDK_INT >= 29) { \/\/ android 10\u53ca\u4ee5\u540e \u4f7f\u7528LifecycleCallbacks\n LifecycleCallbacks.registerIn(activity);\n }\n \/\/ \u989d\u5916\u6dfb\u52a0\u4e00\u4e2aFragment\uff0cGlide\u4e5f\u6709\u76f8\u5173\u7684\u6dfb\u52a0\u4e00\u4e2aFragment\u83b7\u53d6\u751f\u547d\u5468\u671f\u53d8\u5316\n android.app.FragmentManager manager = activity.getFragmentManager();\n if (manager.findFragmentByTag(REPORT_FRAGMENT_TAG) == null) {\n manager.beginTransaction().add(new ReportFragment(), REPORT_FRAGMENT_TAG).commit();\n manager.executePendingTransactions();\n }\n}\n\n\/\/ ReportFragment \n@Override\npublic void onActivityCreated(Bundle savedInstanceState) {\n dispatch(Lifecycle.Event.ON_CREATE);\n}\n\n@Override\npublic void onStart() {\n dispatch(Lifecycle.Event.ON_START);\n}\n\n@Override\npublic void onResume() {\n dispatch(Lifecycle.Event.ON_RESUME);\n}\n\n@Override\npublic void onPause() {\n dispatch(Lifecycle.Event.ON_PAUSE);\n}\n\n@Override\npublic void onStop() {\n dispatch(Lifecycle.Event.ON_STOP);\n}\n\n@Override\npublic void onDestroy() {\n dispatch(Lifecycle.Event.ON_DESTROY);\n}\n\nprivate void dispatch(Lifecycle.Event event) {\n Activity activity = getActivity();\n if (activity instanceof LifecycleRegistryOwner) {\n ((LifecycleRegistryOwner) activity).getLifecycle().handleLifecycleEvent(event);\n return;\n }\n\n if (activity instanceof LifecycleOwner) {\n Lifecycle lifecycle = ((LifecycleOwner) activity).getLifecycle();\n if (lifecycle instanceof LifecycleRegistry) {\n ((LifecycleRegistry) lifecycle).handleLifecycleEvent(event);\n }\n }\n}\n<\/code><\/pre>\n2.1 LifecycleCallbacks<\/h6>\n
\n
static class LifecycleCallbacks implements Application.ActivityLifecycleCallbacks {\n static void registerIn(Activity activity) {\n activity.registerActivityLifecycleCallbacks(new LifecycleCallbacks());\n }\n\n @Override\n public void onActivityCreated(@NonNull Activity activity,\n @Nullable Bundle bundle) {\n }\n\n @Override\n public void onActivityPostCreated(@NonNull Activity activity,\n @Nullable Bundle savedInstanceState) {\n \/\/ activity\u5bf9\u5e94\u7684liftcyle\u53bb\u5206\u53d1Event\u4e8b\u4ef6\n dispatch(activity, Lifecycle.Event.ON_CREATE);\n }\n\n @Override\n public void onActivityStarted(@NonNull Activity activity) {\n }\n\n @Override\n public void onActivityPostStarted(@NonNull Activity activity) {\n dispatch(activity, Lifecycle.Event.ON_START);\n }\n\n @Override\n public void onActivityResumed(@NonNull Activity activity) {\n }\n\n @Override\n public void onActivityPostResumed(@NonNull Activity activity) {\n dispatch(activity, Lifecycle.Event.ON_RESUME);\n }\n\n @Override\n public void onActivityPrePaused(@NonNull Activity activity) {\n dispatch(activity, Lifecycle.Event.ON_PAUSE);\n }\n\n @Override\n public void onActivityPaused(@NonNull Activity activity) {\n }\n\n @Override\n public void onActivityPreStopped(@NonNull Activity activity) {\n dispatch(activity, Lifecycle.Event.ON_STOP);\n }\n\n @Override\n public void onActivityStopped(@NonNull Activity activity) {\n }\n\n @Override\n public void onActivitySaveInstanceState(@NonNull Activity activity,\n @NonNull Bundle bundle) {\n }\n\n @Override\n public void onActivityPreDestroyed(@NonNull Activity activity) {\n dispatch(activity, Lifecycle.Event.ON_DESTROY);\n }\n\n @Override\n public void onActivityDestroyed(@NonNull Activity activity) {\n }\n}\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"