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Android14 增加 property 记录系统当前前台应用的 packageName and className

news 2026/4/30 4:05:16

Android14 记录前台应用的包名和类名

功能描述

增加属性记录前台应用与 activity

具体修改实现

frameworks/base

diff--git a/services/core/java/com/android/server/wm/RootWindowContainer.java b/services/core/java/com/android/server/wm/RootWindowContainer.java index d1b55a4..20ad138100644---a/services/core/java/com/android/server/wm/RootWindowContainer.java+++b/services/core/java/com/android/server/wm/RootWindowContainer.java @@-2509,6+2509,9@@classRootWindowContainerextendsWindowContainer<DisplayContent>false/* deferPause */);}+privatestaticStringsLastTopPkg="";+privatestaticStringsLastTopAct="";+booleanresumeFocusedTasksTopActivities(TasktargetRootTask,ActivityRecordtarget,ActivityOptionstargetOptions,booleandeferPause){@@-2565,6+2568,34@@classRootWindowContainerextendsWindowContainer<DisplayContent>}}+try{+finalTaskfocusedStack=getTopDisplayFocusedRootTask();+if(focusedStack!=null){+finalActivityRecordtopRunningActivity=focusedStack.topRunningActivity();+if(topRunningActivity!=null){+Stringpkg=topRunningActivity.packageName;+Stringactivity="unknown";++if(topRunningActivity.mActivityComponent!=null){+activity=topRunningActivity.mActivityComponent.flattenToShortString();+}elseif(topRunningActivity.intent!=null+&&topRunningActivity.intent.getComponent()!=null){+activity=topRunningActivity.intent.getComponent().flattenToShortString();+}++if(!pkg.equals(sLastTopPkg)||!activity.equals(sLastTopAct)){+SystemProperties.set("persist.sys.top_package",pkg);+SystemProperties.set("persist.sys.top_activity",activity);+Slog.d("topAppInfo","Top app changed: "+pkg+" / "+activity);+sLastTopPkg=pkg;+sLastTopAct=activity;+}+}+}+}catch(Exceptione){+Slog.e("topAppInfo","Failed to set top app props",e);+}+returnresult;}

后续使用发现，部分 className 太长，导致超出属性值范围，故使用 shortClassName

log

04-23 11:42:40.217 798 870 E topAppInfo: java.lang.IllegalArgumentException: value of system property 'persist.sys.top_activity' is longer than 91 bytes: com.google.android.inputmethod.pinyin/com.google.android.apps.inputmethod.pinyin.firstrun.PinyinFirstRunActivity

frameworks/base

diff--git a/services/core/java/com/android/server/wm/RootWindowContainer.java b/services/core/java/com/android/server/wm/RootWindowContainer.java index20ad138..c57d56b100644---a/services/core/java/com/android/server/wm/RootWindowContainer.java+++b/services/core/java/com/android/server/wm/RootWindowContainer.java @@-2577,15+2576,23@@classRootWindowContainerextendsWindowContainer<DisplayContent>Stringactivity="unknown";if(topRunningActivity.mActivityComponent!=null){-activity=topRunningActivity.mActivityComponent.flattenToShortString();+activity=topRunningActivity.mActivityComponent.getShortClassName();}elseif(topRunningActivity.intent!=null&&topRunningActivity.intent.getComponent()!=null){-activity=topRunningActivity.intent.getComponent().flattenToShortString();+activity=topRunningActivity.intent.getComponent().getShortClassName();}if(!pkg.equals(sLastTopPkg)||!activity.equals(sLastTopAct)){-SystemProperties.set("persist.sys.top_package",pkg);-SystemProperties.set("persist.sys.top_activity",activity);+if(pkg!=null&&pkg.length()>91){+pkg=pkg.substring(0,91);+}+if(activity!=null&&activity.length()>91){+activity=activity.substring(0,91);+}++SystemProperties.set("persist.sys.top_package",pkg);+SystemProperties.set("persist.sys.top_activity",activity);+Slog.d("topAppInfo","Top app changed: "+pkg+" / "+activity);sLastTopPkg=pkg;sLastTopAct=activity;