LiveData

ObserverWrapper 数据观察者

LifecycleEventObserver 生命周期观察者

1. 活跃状态接受并更新数据 刷新页面数据
2. 非活跃状态暂停接收数据 防止崩溃，
3. 销毁状态的时候移除观察者 防止内存泄漏
4. 数据可以监听
5. 数据倒灌，就是先发送数据，通过生命周期响应来触发change
6. 数据粘性，先发送数据，后订阅的也能收到数据
7. 为什么能感知生命周期和数据观察者 因为把传入的观察者通过LifecicleBoundObserver包了一层
   LifecicleBoundObserver继承了LifecicleEventObserver和ObserverWrapper,然后添加到lifecicle和livedata中

package androidx.lifecycle;import androidx.annotation.MainThread;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.arch.core.executor.ArchTaskExecutor;
import androidx.arch.core.internal.SafeIterableMap;
import androidx.lifecycle.Lifecycle.State;
import java.util.Iterator;
import java.util.Map;public abstract class LiveData<T> {final Object mDataLock = new Object();static final int START_VERSION = -1;static final Object NOT_SET = new Object();private SafeIterableMap<Observer<? super T>, LiveData<T>.ObserverWrapper> mObservers = new SafeIterableMap();int mActiveCount = 0;private volatile Object mData;volatile Object mPendingData;private int mVersion;private boolean mDispatchingValue;private boolean mDispatchInvalidated;private final Runnable mPostValueRunnable;public LiveData(T value) {this.mPendingData = NOT_SET;this.mPostValueRunnable = new NamelessClass_1();this.mData = value;this.mVersion = 0;}public LiveData() {this.mPendingData = NOT_SET;class NamelessClass_1 implements Runnable {NamelessClass_1() {}public void run() {Object newValue;synchronized(LiveData.this.mDataLock) {newValue = LiveData.this.mPendingData;LiveData.this.mPendingData = LiveData.NOT_SET;}LiveData.this.setValue(newValue);}}this.mPostValueRunnable = new NamelessClass_1();this.mData = NOT_SET;this.mVersion = -1;}private void considerNotify(LiveData<T>.ObserverWrapper observer) {if (observer.mActive) {if (!observer.shouldBeActive()) {observer.activeStateChanged(false);} else if (observer.mLastVersion < this.mVersion) {observer.mLastVersion = this.mVersion;observer.mObserver.onChanged(this.mData);}}}void dispatchingValue(@Nullable LiveData<T>.ObserverWrapper initiator) {if (this.mDispatchingValue) {this.mDispatchInvalidated = true;} else {this.mDispatchingValue = true;do {this.mDispatchInvalidated = false;if (initiator != null) {this.considerNotify(initiator);initiator = null;} else {Iterator<Map.Entry<Observer<? super T>, LiveData<T>.ObserverWrapper>> iterator = this.mObservers.iteratorWithAdditions();while(iterator.hasNext()) {this.considerNotify((ObserverWrapper)((Map.Entry)iterator.next()).getValue());if (this.mDispatchInvalidated) {break;}}}} while(this.mDispatchInvalidated);this.mDispatchingValue = false;}}@MainThreadpublic void observe(@NonNull LifecycleOwner owner, @NonNull Observer<? super T> observer) {assertMainThread("observe");if (owner.getLifecycle().getCurrentState() != State.DESTROYED) {LiveData<T>.LifecycleBoundObserver wrapper = new LifecycleBoundObserver(owner, observer);LiveData<T>.ObserverWrapper existing = (ObserverWrapper)this.mObservers.putIfAbsent(observer, wrapper);if (existing != null && !existing.isAttachedTo(owner)) {throw new IllegalArgumentException("Cannot add the same observer with different lifecycles");} else if (existing == null) {owner.getLifecycle().addObserver(wrapper);}}}@MainThreadpublic void observeForever(@NonNull Observer<? super T> observer) {assertMainThread("observeForever");LiveData<T>.AlwaysActiveObserver wrapper = new AlwaysActiveObserver(observer);LiveData<T>.ObserverWrapper existing = (ObserverWrapper)this.mObservers.putIfAbsent(observer, wrapper);if (existing instanceof LifecycleBoundObserver) {throw new IllegalArgumentException("Cannot add the same observer with different lifecycles");} else if (existing == null) {wrapper.activeStateChanged(true);}}@MainThreadpublic void removeObserver(@NonNull Observer<? super T> observer) {assertMainThread("removeObserver");LiveData<T>.ObserverWrapper removed = (ObserverWrapper)this.mObservers.remove(observer);if (removed != null) {removed.detachObserver();removed.activeStateChanged(false);}}@MainThreadpublic void removeObservers(@NonNull LifecycleOwner owner) {assertMainThread("removeObservers");Iterator var2 = this.mObservers.iterator();while(var2.hasNext()) {Map.Entry<Observer<? super T>, LiveData<T>.ObserverWrapper> entry = (Map.Entry)var2.next();if (((ObserverWrapper)entry.getValue()).isAttachedTo(owner)) {this.removeObserver((Observer)entry.getKey());}}}protected void postValue(T value) {boolean postTask;synchronized(this.mDataLock) {postTask = this.mPendingData == NOT_SET;this.mPendingData = value;}if (postTask) {ArchTaskExecutor.getInstance().postToMainThread(this.mPostValueRunnable);}}@MainThreadprotected void setValue(T value) {assertMainThread("setValue");++this.mVersion;this.mData = value;this.dispatchingValue((ObserverWrapper)null);}@Nullablepublic T getValue() {Object data = this.mData;return data != NOT_SET ? data : null;}int getVersion() {return this.mVersion;}protected void onActive() {}protected void onInactive() {}public boolean hasObservers() {return this.mObservers.size() > 0;}public boolean hasActiveObservers() {return this.mActiveCount > 0;}static void assertMainThread(String methodName) {if (!ArchTaskExecutor.getInstance().isMainThread()) {throw new IllegalStateException("Cannot invoke " + methodName + " on a background thread");}}private class AlwaysActiveObserver extends LiveData<T>.ObserverWrapper {AlwaysActiveObserver(Observer<? super T> observer) {super(observer);}boolean shouldBeActive() {return true;}}private abstract class ObserverWrapper {final Observer<? super T> mObserver;boolean mActive;int mLastVersion = -1;ObserverWrapper(Observer<? super T> observer) {this.mObserver = observer;}abstract boolean shouldBeActive();boolean isAttachedTo(LifecycleOwner owner) {return false;}void detachObserver() {}void activeStateChanged(boolean newActive) {if (newActive != this.mActive) {this.mActive = newActive;boolean wasInactive = LiveData.this.mActiveCount == 0;LiveData var10000 = LiveData.this;var10000.mActiveCount += this.mActive ? 1 : -1;if (wasInactive && this.mActive) {LiveData.this.onActive();}if (LiveData.this.mActiveCount == 0 && !this.mActive) {LiveData.this.onInactive();}if (this.mActive) {LiveData.this.dispatchingValue(this);}}}}class LifecycleBoundObserver extends LiveData<T>.ObserverWrapper implements LifecycleEventObserver {@NonNullfinal LifecycleOwner mOwner;LifecycleBoundObserver(@NonNull LifecycleOwner owner, Observer<? super T> observer) {super(observer);this.mOwner = owner;}boolean shouldBeActive() {return this.mOwner.getLifecycle().getCurrentState().isAtLeast(State.STARTED);}public void onStateChanged(@NonNull LifecycleOwner source, @NonNull Lifecycle.Event event) {if (this.mOwner.getLifecycle().getCurrentState() == State.DESTROYED) {LiveData.this.removeObserver(this.mObserver);} else {this.activeStateChanged(this.shouldBeActive());}}boolean isAttachedTo(LifecycleOwner owner) {return this.mOwner == owner;}void detachObserver() {this.mOwner.getLifecycle().removeObserver(this);}}
}

ViewModel

1.为什么ViewModel生命周期比activity长
attach(Acitivity)->mLastNonConfigurationInstances（ActivityClientRecord）-> 恢复
performDestoryActivity(ActivityThread)-> retainNonConfigurationInstances(Activity)- onRetainConfigurationInstances(ComponentActivity)->mLastNonConfigurationInstances 保存

ViewModelStore

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//package androidx.lifecycle;import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;public class ViewModelStore {private final HashMap<String, ViewModel> mMap = new HashMap();public ViewModelStore() {}final void put(String key, ViewModel viewModel) {ViewModel oldViewModel = (ViewModel)this.mMap.put(key, viewModel);if (oldViewModel != null) {oldViewModel.onCleared();}}final ViewModel get(String key) {return (ViewModel)this.mMap.get(key);}Set<String> keys() {return new HashSet(this.mMap.keySet());}public final void clear() {Iterator var1 = this.mMap.values().iterator();while(var1.hasNext()) {ViewModel vm = (ViewModel)var1.next();vm.clear();}this.mMap.clear();}
}

ViewModelProvider

package androidx.lifecycle;import android.app.Application;
import androidx.annotation.MainThread;
import androidx.annotation.NonNull;
import java.lang.reflect.InvocationTargetException;public class ViewModelProvider {private static final String DEFAULT_KEY = "androidx.lifecycle.ViewModelProvider.DefaultKey";private final Factory mFactory;private final ViewModelStore mViewModelStore;public ViewModelProvider(@NonNull ViewModelStoreOwner owner) {this((ViewModelStore)owner.getViewModelStore(), (Factory)(owner instanceof HasDefaultViewModelProviderFactory ? ((HasDefaultViewModelProviderFactory)owner).getDefaultViewModelProviderFactory() : ViewModelProvider.NewInstanceFactory.getInstance()));}public ViewModelProvider(@NonNull ViewModelStoreOwner owner, @NonNull Factory factory) {this(owner.getViewModelStore(), factory);}public ViewModelProvider(@NonNull ViewModelStore store, @NonNull Factory factory) {this.mFactory = factory;this.mViewModelStore = store;}@NonNull@MainThreadpublic <T extends ViewModel> T get(@NonNull Class<T> modelClass) {String canonicalName = modelClass.getCanonicalName();if (canonicalName == null) {throw new IllegalArgumentException("Local and anonymous classes can not be ViewModels");} else {return this.get("androidx.lifecycle.ViewModelProvider.DefaultKey:" + canonicalName, modelClass);}}@NonNull@MainThreadpublic <T extends ViewModel> T get(@NonNull String key, @NonNull Class<T> modelClass) {ViewModel viewModel = this.mViewModelStore.get(key);if (modelClass.isInstance(viewModel)) {if (this.mFactory instanceof OnRequeryFactory) {((OnRequeryFactory)this.mFactory).onRequery(viewModel);}return viewModel;} else {if (viewModel != null) {}if (this.mFactory instanceof KeyedFactory) {viewModel = ((KeyedFactory)((KeyedFactory)this.mFactory)).create(key, modelClass);} else {viewModel = this.mFactory.create(modelClass);}this.mViewModelStore.put(key, viewModel);return viewModel;}}public static class AndroidViewModelFactory extends NewInstanceFactory {private static AndroidViewModelFactory sInstance;private Application mApplication;@NonNullpublic static AndroidViewModelFactory getInstance(@NonNull Application application) {if (sInstance == null) {sInstance = new AndroidViewModelFactory(application);}return sInstance;}public AndroidViewModelFactory(@NonNull Application application) {this.mApplication = application;}@NonNullpublic <T extends ViewModel> T create(@NonNull Class<T> modelClass) {if (AndroidViewModel.class.isAssignableFrom(modelClass)) {try {return (ViewModel)modelClass.getConstructor(Application.class).newInstance(this.mApplication);} catch (NoSuchMethodException var3) {throw new RuntimeException("Cannot create an instance of " + modelClass, var3);} catch (IllegalAccessException var4) {throw new RuntimeException("Cannot create an instance of " + modelClass, var4);} catch (InstantiationException var5) {throw new RuntimeException("Cannot create an instance of " + modelClass, var5);} catch (InvocationTargetException var6) {throw new RuntimeException("Cannot create an instance of " + modelClass, var6);}} else {return super.create(modelClass);}}}public static class NewInstanceFactory implements Factory {private static NewInstanceFactory sInstance;public NewInstanceFactory() {}@NonNullstatic NewInstanceFactory getInstance() {if (sInstance == null) {sInstance = new NewInstanceFactory();}return sInstance;}@NonNullpublic <T extends ViewModel> T create(@NonNull Class<T> modelClass) {try {return (ViewModel)modelClass.newInstance();} catch (InstantiationException var3) {throw new RuntimeException("Cannot create an instance of " + modelClass, var3);} catch (IllegalAccessException var4) {throw new RuntimeException("Cannot create an instance of " + modelClass, var4);}}}abstract static class KeyedFactory extends OnRequeryFactory implements Factory {KeyedFactory() {}@NonNullpublic abstract <T extends ViewModel> T create(@NonNull String var1, @NonNull Class<T> var2);@NonNullpublic <T extends ViewModel> T create(@NonNull Class<T> modelClass) {throw new UnsupportedOperationException("create(String, Class<?>) must be called on implementaions of KeyedFactory");}}static class OnRequeryFactory {OnRequeryFactory() {}void onRequery(@NonNull ViewModel viewModel) {}}public interface Factory {@NonNull<T extends ViewModel> T create(@NonNull Class<T> var1);}
}

ViewModelStoreOwner

public interface ViewModelStoreOwner {@NonNullViewModelStore getViewModelStore();
}

ComponentActivity

NonConfigurationInstances

  @Nullablepublic final Object onRetainNonConfigurationInstance() {Object custom = this.onRetainCustomNonConfigurationInstance();ViewModelStore viewModelStore = this.mViewModelStore;NonConfigurationInstances nci;if (viewModelStore == null) {nci = (NonConfigurationInstances)this.getLastNonConfigurationInstance();if (nci != null) {viewModelStore = nci.viewModelStore;}}if (viewModelStore == null && custom == null) {return null;} else {nci = new NonConfigurationInstances();nci.custom = custom;nci.viewModelStore = viewModelStore;return nci;}}@NonNullpublic ViewModelStore getViewModelStore() {if (this.getApplication() == null) {throw new IllegalStateException("Your activity is not yet attached to the Application instance. You can't request ViewModel before onCreate call.");} else {if (this.mViewModelStore == null) {NonConfigurationInstances nc = (NonConfigurationInstances)this.getLastNonConfigurationInstance();if (nc != null) {this.mViewModelStore = nc.viewModelStore;}if (this.mViewModelStore == null) {this.mViewModelStore = new ViewModelStore();}}return this.mViewModelStore;}}@NonNullpublic ViewModelProvider.Factory getDefaultViewModelProviderFactory() {if (this.getApplication() == null) {throw new IllegalStateException("");} else {if (this.mDefaultFactory == null) {this.mDefaultFactory = new SavedStateViewModelFactory(this.getApplication(), this, this.getIntent() != null ? this.getIntent().getExtras() : null);}return this.mDefaultFactory;}}static final class NonConfigurationInstances {Object custom;ViewModelStore viewModelStore;NonConfigurationInstances() {}}

Activity attach 恢复

NonConfigurationInstances

	@UnsupportedAppUsagefinal void attach(Context context, ActivityThread aThread,Instrumentation instr, IBinder token, int ident,Application application, Intent intent, ActivityInfo info,CharSequence title, Activity parent, String id,NonConfigurationInstances lastNonConfigurationInstances,Configuration config, String referrer, IVoiceInteractor voiceInteractor,Window window, ActivityConfigCallback activityConfigCallback, IBinder assistToken) {mLastNonConfigurationInstances = lastNonConfigurationInstances;}NonConfigurationInstances retainNonConfigurationInstances() {Object activity = onRetainNonConfigurationInstance();NonConfigurationInstances nci = new NonConfigurationInstances();nci.activity = activity;nci.children = children;nci.fragments = fragments;nci.loaders = loaders;if (mVoiceInteractor != null) {mVoiceInteractor.retainInstance();nci.voiceInteractor = mVoiceInteractor;}return nci;}static final class NonConfigurationInstances {Object activity;HashMap<String, Object> children;FragmentManagerNonConfig fragments;ArrayMap<String, LoaderManager> loaders;VoiceInteractor voiceInteractor;}

ActivityThread performDestroyActivity 保存

   @UnsupportedAppUsagefinal ArrayMap<IBinder, ActivityClientRecord> mActivities = new ArrayMap<>();ActivityClientRecord performDestroyActivity(IBinder token, boolean finishing,int configChanges, boolean getNonConfigInstance, String reason) {ActivityClientRecord r = mActivities.get(token);Class<? extends Activity> activityClass = null;if (localLOGV) Slog.v(TAG, "Performing finish of " + r);if (r != null) {activityClass = r.activity.getClass();r.activity.mConfigChangeFlags |= configChanges;if (finishing) {r.activity.mFinished = true;}performPauseActivityIfNeeded(r, "destroy");if (getNonConfigInstance) {try {r.lastNonConfigurationInstances= r.activity.retainNonConfigurationInstances();} catch (Exception e) {if (!mInstrumentation.onException(r.activity, e)) {throw new RuntimeException("Unable to retain activity "+ r.intent.getComponent().toShortString()+ ": " + e.toString(), e);}}}return r;}

ActivityClientRecord

	public static final class ActivityClientRecord {@UnsupportedAppUsagepublic IBinder token;Activity.NonConfigurationInstances lastNonConfigurationInstances;}