接受生命周期事件并且做出相应处理

Posted 2022-08-05 liyanyan665

LifecycleBoundObserver.java
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class LifecycleBoundObserver extends ObserverWrapper implements GenericLifecycleObserver

@Override
public void onStateChanged(LifecycleOwner source, Lifecycle.Event event)
if (mOwner.getLifecycle().getCurrentState() == DESTROYED)
removeObserver(mObserver);
return;

activeStateChanged(shouldBeActive());


@Override
boolean shouldBeActive()
return mOwner.getLifecycle().getCurrentState().isAtLeast(STARTED);



ObserverWrapper.java
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private abstract class ObserverWrapper

void activeStateChanged(boolean newActive)
if (newActive == mActive)
return;

// immediately set active state, so we‘d never dispatch anything to inactive
// owner
mActive = newActive;
boolean wasInactive = LiveData.this.mActiveCount == 0;
LiveData.this.mActiveCount += mActive ? 1 : -1;
if (wasInactive && mActive)
onActive();

if (LiveData.this.mActiveCount == 0 && !mActive)
onInactive(http://www.my516.com);

if (mActive)
dispatchingValue(this);


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