// isn't resumed....pause of activity that is not resumed: " + r.intent.getComponent().toShortString());...stop of " + r); if (r !...So here we likewise don't want to call onStop() // if the activity isn't resumed....stop of activity that is already stopped: " + r.intent.getComponent(
A task is a collection of activities that users interact with when performing a certain job....一个Activity总是属于某个Task，它的Resumed或Stopped状态影响其Task状态。 每次Task栈顶的Activity被finish，那么它出栈。...The previous activity in the stack is resumed....Activity的状态保存 处于stopped状态的Activity，它的内存状态和Resumed比并没有变化。...这样稍后用户回到界面时可以从Stopped状态转为Resumed状态，即从后台转到前台。
Leaving an // activity in an incomplete state can lead to issues, such as performing operations...And for paranoia, make sure we have correctly resumed the top activity..../** * Ensure that the top activity in the stack is resumed....* * @param prev The previously resumed activity, for when in the process * of pausing...may be waiting for stop, but that is no longer // appropriate for it.
我也收到错误：E/ActivityThread: Performing pause of activity that is not resumed 从this问题开始，我了解到不能从onResume调用此函数...onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main
: Timber.d("ON_STOP"); break; case ON_DESTROY:...; } void performStop() { mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_STOP...这就是LifecycleRegistry的高明之处，因为他下面要做事件同步.如果直接派发RESUMED，观察者且不是丢失了ON_CREATE,ON_START事件？...case CREATED: return ON_DESTROY; case STARTED: return ON_STOP...如果你看懂前面的表，这里就不难理解，举个例子:观察者为RESUMED状态，此时宿主发生onPase()生命周期，那么宿主会进入STARTED状态。
/** * Constant for onStop event of the {@link LifecycleOwner}. */ ON_STOP...enum State { DESTROYED, INITIALIZED, CREATED, STARTED, RESUMED...ON_PAUSE 对应Activity的onPause的事件 ON_STOP 对应Activity的onStop的事件 ON_DESTROY 对应Activity的onDestroy的事件 ON_ANY...RESUMED 对应Activity的onResume LifecycleRegistry实现类： LifecycleRegistry实现了addObserver方法，添加观察者LifecycleObserver...case CREATED: return ON_DESTROY; case STARTED: return ON_STOP
{ Log.e(javaClass.name, "-------onPause") } @OnLifecycleEvent(Lifecycle.Event.ON_STOP...ON_CREATE, ON_START, ON_RESUME, ON_PAUSE, ON_STOP...，需要将INITIALIZED到RESUMED之间的 // 所有事件分发给Observer while ((statefulObserver.mState.compareTo...@Override public void onStop() { super.onStop(); dispatch(Lifecycle.Event.ON_STOP...mStartedCounter == 0 && mPauseSent) { mRegistry.handleLifecycleEvent(Lifecycle.Event.ON_STOP
⑦ ON_STOP：LifecycleOwner停止时触发此事件。...或者是ON_STOP事件之后，ON_DESTROY事件之前的状态。 ③ STARTED：ON_START事件之后，ON_RESUME事件之前的状态。...或者是事件之ON_PAUSE后，ON_STOP事件之前的状态。 ④ RESUMED：ON_RESUME事件之后的状态。 ⑤ DESTROYED：ON_DESTROY事件之后的状态。...举例来说，如果Lifecycle目前在RESUMED状态，则观察员将收到ON_CREATE，ON_START和ON_RESUME事件。...如果LiveData的观察者列表中不存在活跃观察者了，也就是说没有一个观察者绑定的LifecycleOwner的Lifecycle处于 STARTED 或者RESUMED状态。
onResume"; private static final String ON_PAUSE = "onPause"; private static final String ON_STOP...This is typically * used to commit unsaved changes to persistent data, stop animations and other...Implementations of this method must be very quick because the next * activity will not be resumed...been * resumed and is covering this one....() { super.onStop(); logAndAppend(ON_STOP); } // COMPLETED (6) Override onRestart
// ... } void start() { // 连接系统定位服务 } void stop...@Override public void onStop() { super.onStop(); myLocationListener.stop...getStateAfter(Event event) { switch (event) { case ON_CREATE: case ON_STOP...可以参考官方文档的这张图帮助理解： 图1 构成生命周期的状态和事件所以，一个完整的生命周期过程是：从 Initialized 开始，到 Resumed；再从 Resumed 到 Destroyed...case CREATED: return ON_DESTROY; case STARTED: return ON_STOP
(其它几个状态会很快就切换掉，停留的时间比较短暂) Resumed：该状态下，activity处在前台，用户可以与它进行交互。...然而，一旦之前的activity被完全阻塞并不可见时，则其会进入Stop状态(将在下一小节讨论)。...如果activity实际上是要被Stop，那么我们应该为了切换的顺畅而减少在OnPause()方法里面的工作量。...我们不需要在恢复到Resumed state状态前重新初始化那些被保存在内存中的组件。...系统也有可能会在Activity处于stop状态且长时间不被使用，或者是在前台activity需要更多系统资源的时关闭后台进程，以图获取更多的内存。
protected void onResume() { super.onResume(); mLifecycleRegistry.markState(Lifecycle.State.RESUMED...return compareTo(state) >= 0; } } State 中，他们排序的顺序是 DESTROYED < INITIALIZED < CREATED < STARTED < RESUMED...CREATED: return ON_START; case STARTED: return ON_RESUME; case RESUMED...static State getStateAfter(Event event) { switch (event) { case ON_CREATE: case ON_STOP...@Override public void onStop() { super.onStop(); dispatch(Lifecycle.Event.ON_STOP
public enum State { DESTROYED, INITIALIZED, CREATED, STARTED, RESUMED...void onActivityPreStopped(@NonNull Activity activity) { dispatch(activity, Lifecycle.Event.ON_STOP...ON_PAUSE、ON_STOP、ON_DESTROY 在对应生命周期方法回调之前分发。 接着看分发生命周期事件的 dispatch() 方法。...队尾最新的状态 如果当前状态 mState 比 mObserverMap 最老(队首) 的状态要小，说明可能存在观察者需要同步自己的状态到更低的状态，我把它叫做 **"下山"**，可以对比下图中从最高点的 RESUMED...; case RESUMED: return ON_PAUSE; default:
void onPause() { LogUtil.i(TAG, "onPause"); } @OnLifecycleEvent(Lifecycle.Event.ON_STOP...@Override public void onStop() { super.onStop(); dispatch(Lifecycle.Event.ON_STOP...#onResume() onResume} is called. */ RESUMED; } } Lifecycle.Event对应activity的各个声明周期...case CREATED: return ON_DESTROY; case STARTED: return ON_STOP...** 假设当前 LifecycleRegistry**的mState处于**RESUMED**状态。
Jetpack Lifecycle记录 在 Android 中，我们可以使用 Jetpack 的 Lifecycle 组件来管理我们的生命周期，可以执行操作来响应另一个组件（例如 Activity ）的生命周期变化...case CREATED: return ON_DESTROY; case STARTED: return ON_STOP...getStateAfter(Event event) { switch (event) { case ON_CREATE: case ON_STOP...event); } 这里非常的绕，直接读容易绕晕，我们整理一下: downEvent INITIALIZED -> 无 CREATED -> ON_DESTROY STARTED -> ON_STOP...> ON_START STARTED -> ON_RESUME RESUMED -> 无 getStateAfter ON_CREATE、ON_STOP -> CREATED ON_START、ON_PAUSE
in the stack is resumed...* * @param prev The previously resumed activity, for when in the process * of pausing...the currently resumed activity....It is an error to call this if there * is already an activity being paused or there is no resumed...manager to stop us.
onStop() { super.onStop(); // manage other component myLocationListener.stop...enum State { DESTROYED, INITIALIZED, CREATED, STARTED, RESUMED...(provider); mState = INITIALIZED; } // 注释0 将Lifecycle的状态，移到给出的状态，并且向观察者分发所需的事件：假如Lifecycle处于RESUMED...在派发 ON_CREATE 或者 ON_STOP事件之后。 onSaveInstanceState调用，往往发生在onPause和onStop之间，代表系统资源紧张，马上要回收了。...这么做是等价于ON_STOP事件派发。 状态获取结束后，回到moveToState方法，sync(), 执行事件派发操作。
public void onPause() { Log.d(TAG, "onPause: "); } @OnLifecycleEvent(Lifecycle.Event.ON_STOP...public abstract class Lifecycle { public enum Event { ON_CREATE,ON_START,ON_RESUME,ON_PAUSE,ON_STOP...class Lifecycle { public enum State { DESTROYED, INITIALIZED, CREATED, STARTED, RESUMED...但是Activity类并没有实现LifecycleOwner接口，所以，如果我们需要去监听自定义Activity的话，需要自己手动去实现LifecycleOwner接口。详见后面分析。...void onResume() { super.onResume(); //标记状态 mLifecycleRegistry.markState(Lifecycle.State.RESUMED
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