启动另一个全屏活动时未调用Activity的onStop()

Question

我曾经认为,当活动A被另一个全屏活动B替换时,onStop()将调用A的回调.

这也反映在文档中:

活动的可见生命周期发生在对onStart()的调用和对onStop()的调用之间.在此期间,用户可以在屏幕上看到活动并与之交互.例如,当一个新活动开始并且这个活动不再可见时,会调用onStop().

然而,现在,我正在观察不同的行为(在Lollipop和Marshmallow上测试).

我开始AuthenticationActivity从HomeActivity和,尽管事实AuthenticationActivity是一个全屏幕活动,HomeActivity不停止.

在清单中声明这些活动:

    <activity
        android:name=".screens.home.activities.HomeActivity"
        android:configChanges="orientation|keyboardHidden|screenSize"
        android:launchMode="singleTop">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>

    <activity
        android:name=".screens.authentication.activities.AuthenticationActivity"
        android:configChanges="orientation|keyboardHidden|screenSize"
        android:windowSoftInputMode="adjustResize"
        android:theme="@style/AppTheme.Transparent"/>

当活动切换时,这是我在logcat中观察到的:

11-28 10:16:31.443 15183-15183/somepackage I/LOG:: LifeCycle : activity (somepackage.screens.home.activities.HomeActivity@3561e8e1) paused
11-28 10:16:31.583 15183-15183/somepackage I/LOG:: LifeCycle : activity (somepackage.screens.authentication.activities.AuthenticationActivity@2bbdb20f) created
11-28 10:16:31.753 15183-15183/somepackage D/Activity: performCreate Call secproduct feature valuefalse
11-28 10:16:31.753 15183-15183/somepackage D/Activity: performCreate Call debug elastic valuetrue
11-28 10:16:31.753 15183-15183/somepackage D/AuthenticationActivity: onStart()
11-28 10:16:31.753 15183-15183/somepackage I/LOG:: LifeCycle : activity (somepackage.screens.authentication.activities.AuthenticationActivity@2bbdb20f) started
11-28 10:16:31.993 15183-15183/somepackage D/AuthenticationActivity: onResume()
11-28 10:16:31.993 15183-15183/somepackage I/LOG:: LifeCycle : activity (somepackage.screens.authentication.activities.AuthenticationActivity@2bbdb20f) resumed
11-28 10:16:32.213 15183-15183/somepackage I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@266569db time:354918367
11-28 10:16:32.613 15183-15183/somepackage I/LOG:: LifeCycle : activity (somepackage.screens.home.activities.HomeActivity@3561e8e1) saveInstanceState
11-28 10:16:32.633 15183-15183/somepackage V/ActivityThread: updateVisibility : ActivityRecord{2bcd65fd token=android.os.BinderProxy@86da390 {somepackage/somepackage.screens.home.activities.HomeActivity}} show : true

这是怎么回事？

Answer 1

"例如,当新活动开始并且不再可见时,会调用onStop()."

由于您的AuthenticationActivity是透明的,HomeActivity仍然可见=> onStop未被调用