adb shell am stack list命令调试查看ActivityManagerService相关属性详解

hi，学员们大家好，经常在做框架特别是ActivityManagerService模块开发过程中会使用一个命令来查看一些信息辅助我们看到系统目前的Activity的一个情况，主要包括Activity分布的Stack，Task情况。具体效果如下：

[email protected]:~/xiaomi5/frameworks$ adb shell am stack list
Stack id=4 bounds=[0,0][1080,1920] displayId=0 userId=0
 configuration={1.0 ?mcc?mnc [zh_CN] ldltr sw360dp w360dp h616dp 480dpi nrml long port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 1920) mAppBounds=Rect(0, 0 - 1080, 1920) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.12}
  taskId=231: com.android.dialer/com.android.dialer.main.impl.MainActivity bounds=[0,0][1080,1920] userId=0 visible=true topActivity=ComponentInfo{com.android.dialer/com.android.dialer.main.impl.MainActivity}

Stack id=0 bounds=[0,0][1080,1920] displayId=0 userId=0
 configuration={1.0 ?mcc?mnc [zh_CN] ldltr sw360dp w360dp h616dp 480dpi nrml long port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 1920) mAppBounds=Rect(0, 0 - 1080, 1920) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=home mAlwaysOnTop=undefined mRotation=ROTATION_0} s.12}
  taskId=228: com.android.launcher3/com.android.launcher3.lineage.LineageLauncher bounds=[0,0][1080,1920] userId=0 visible=false topActivity=ComponentInfo{com.android.launcher3/com.android.launcher3.lineage.LineageLauncher}

Stack id=3 bounds=[0,0][1080,1920] displayId=0 userId=0
 configuration={1.0 ?mcc?mnc [zh_CN] ldltr sw360dp w360dp h616dp 480dpi nrml long port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 1920) mAppBounds=Rect(0, 0 - 1080, 1920) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.12}
  taskId=230: com.android.messaging/com.android.messaging.ui.conversationlist.ConversationListActivity bounds=[0,0][1080,1920] userId=0 visible=false topActivity=ComponentInfo{com.android.messaging/com.android.messaging.ui.conversationlist.ConversationListActivity}

Stack id=1 bounds=[0,0][1080,1920] displayId=0 userId=0
 configuration={1.0 ?mcc?mnc [zh_CN] ldltr sw360dp w360dp h616dp 480dpi nrml long port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 1920) mAppBounds=Rect(0, 0 - 1080, 1920) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.12}
  taskId=229: com.android.contacts/com.android.contacts.activities.PeopleActivity bounds=[0,0][1080,1920] userId=0 visible=false topActivity=ComponentInfo{com.android.contacts/com.android.contacts.activities.PeopleActivity}

命令输出可以看出以下信息：
1、当前显示最前端的Activity stack一般是第一个输出的Stack id=4
2、对于的Activiy taskId是 taskId=231: com.android.dialer/com.android.dialer.main.impl.MainActivity 是task底部Activity，也有对应的topActivity=ComponentInfo{com.android.dialer/com.android.dialer.main.impl.MainActivity
3、有Activity Stack的显示的窗口区域bounds=[0,0][1080,1920]

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Android Framework实战视频–FallbackHome进程启动及Activity启动篇
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