<activity

        android:name=".MainActivity"
        android:process="com.test.apptask"
        android:launchMode="singleTask"
        android:allowTaskReparenting="true"
        android:alwaysRetainTaskState="true"
        android:taskAffinity=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

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

    <activity
        android:name=".TestActivity"
        android:process=":test"
        android:launchMode="singleTask"
        android:allowTaskReparenting="true"
        android:alwaysRetainTaskState="true"
        android:taskAffinity=".TestActivity"/>
我打开主应用(MainActivity)，然后打开这个TestActivity,我按home回到主界面，看最近打开应用，这是会出现两个任务栈，在移除TestActivity对应的Task的时候主进程也被关闭了