启动全屏Activity时，另一个Activity的onStop()方法未被调用

Question

我曾经认为当Activity A被另一个全屏的Activity B所取代时，A的onStop()回调将被调用。

这也反映在文档中：

活动的可见生命周期发生在调用onStart()和调用onStop()之间。在此期间，用户可以在屏幕上看到活动并与其交互。例如，当启动新活动并且旧活动不再可见时，会调用onStop()。

然而，现在我观察到了不同的行为（在Lollipop和Marshmallow上进行了测试）。

我从HomeActivity启动AuthenticationActivity，尽管AuthenticationActivity是一个全屏活动，但HomeActivity并没有停止。

这些活动在清单中的声明：

    <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，我在logcat中观察到以下内容：

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

发生了什么事情？

- Vasiliy

Answer 1

"例如，当新活动开始并且此活动不再可见时，onStop() 被调用。"

因为您的认证活动是透明的，HomeActivity 仍然可见 => onStop 不会被调用。

- quanlt

Answer 2

尝试移除：

android:theme="@style/AppTheme.Transparent"

- T.S