-
-
玩转Android10源码开发定制(十)增加获取当前运行最顶层的Activity命令
-
发表于: 2021-1-5 10:38
-
在 Android 开发中，由于某些需求常常需要获取当前顶层的 Activity 信息。比如 App 中获取顶层 Activity 界面信息来判断某一个 app 是否在前台运行、统计某一个 app 的使用时长、更有恶意程序通过监听界面伪造 app 进行盗号以及欺诈、自动化开发中通过顶层 Activity 进行页面元素定位点击(比如基于辅助功自动化、uiautomator 自动化)等等操作。 在逆向工程中，获取当前运行 app 运行顶层 activity 也比较常用。通过顶层 Activity 可以快速定位界面中的功能在哪一个页面。
在 Android app 开发中，获取顶层 Activity 有以下方式:
首先需要在 Androidmanifest 中添加权限
代码如下：
在AndroidManifest文件中添加权限:
启动授权页面，需要用户授权app获取应用使用情况统计权限。跳转授权页面参考:
获取顶层 activity 参考代码:
除了 app 中使用代码获取顶层 Activity，也可以通过 adb 命令获取当前顶层的 Activity 信息，比如 windows 系统下 Android 10 手机可以用如下 adb 命令:
由于 ActivityManager->getRunningTasks 获取顶层 Activity 比较准确一些，以下将采用 ActivityManager->getRunningTasks 方式来进行研究实现。
ActivityManager源码路径位于:
frameworks/base/core/java/android/app/ActivityManager.java
ActivityManager 中 getRunningTask 调用如下:
由以上代码分析可知，最终调用的是 ActivityTaskManager.getService().getTasks。接下来分析 ActivityTaskManager 中的调用情况。
ActivityTaskManager 源码路径:
frameworks/base/core/java/android/app/ActivityTaskManager.java
ActivityTaskManager 中 getService 实现如下:
ActivityTaskManager.getService().getTasks 调用最终变成了 IActivityTaskManager.getTasks。在安卓源码中没有找到 IActivityTaskManager.java 文件，只找到 IActivityTaskManager.aidl 文件，说明 IActivityTaskManager.getTasks 调用最终转化了 binder 的进程间调用。安卓中 aidl 是用于 binder 通信定义服务器和客户端通信接口的一种描述语言，源码编译的时候会将 aidl 文件转化为 java 文件。
IActivityTaskManager.aidl 文件路径如下:
frameworks/base/core/java/android/app/IActivityTaskManager.aidl
在源码中搜索关键字“extends IActivityTaskManager"找到 ActivityTaskManagerService 文件使用了。那么说明 ActivityTaskManagerService 最终实现了 getTasks 的函数功能。以下追踪 ActivityTaskManagerService 中的调用情况:
ActivityTaskManagerService 代码路径:
frameworks/base/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
ActivityTaskManagerService 中 getTasks 代码如下:
通过以上分析,已经知道系统如何实现 getRunningTask 函数功能的流程。借鉴 getRunningTask 实现，要增加一个获取顶层 Activity 的接口，只需要在 IActivityTaskManager.aidl 中增加一个接口，仿照 ActivityTaskManagerService 中 getTasks 的实现方式即可。
ActivityManager getRunningTasks大概的一个调用流程总结如下,图中省略了许多binder交互的细节:
以上工作做好之后，我们就可以通过如下代码调用获取顶层 activity 了。代码如下：
源码根目录执行编译：
source build/envsetup.sh</br>
breakfast oneplus3</br>
brunch oneplus3 </br>
刷机测试效果:
<uses-permission android:name = "android.permission.GET_TASKS"/>
<uses-permission android:name = "android.permission.GET_TASKS"/>
ActivityManager mAm = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
String activity_name = mAm.getRunningTasks(1).get(0).topActivity.getClassName();
ActivityManager mAm = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
String activity_name = mAm.getRunningTasks(1).get(0).topActivity.getClassName();
<uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>
<uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>
Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS);
context.startActivity(intent);Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS);
context.startActivity(intent);public static getTopActivity(){ long endTime = System.currentTimeMillis();
long beginTime = endTime - 10000;
UsageStatsManager sUsageStatsManager =null;
if (sUsageStatsManager == null) {
sUsageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
}
String result = "";
UsageEvents.Event event = new UsageEvents.Event();
UsageEvents usageEvents = sUsageStatsManager.queryEvents(beginT ime, endTime);
while (usageEvents.hasNextEvent()) {
usageEvents.getNextEvent(event);
if (event.getEventType() == UsageEvents.Event.MOVE_TO_FOREGROUND) {
result = event.getPackageName()+"/"+event.getClassName();
}
}
if (!android.text.TextUtils.isEmpty(result)) {
return result;
}
}
return "";
}public static getTopActivity(){ long endTime = System.currentTimeMillis();
long beginTime = endTime - 10000;
UsageStatsManager sUsageStatsManager =null;
if (sUsageStatsManager == null) {
sUsageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
}
String result = "";
UsageEvents.Event event = new UsageEvents.Event();
UsageEvents usageEvents = sUsageStatsManager.queryEvents(beginT ime, endTime);
while (usageEvents.hasNextEvent()) {
usageEvents.getNextEvent(event);
if (event.getEventType() == UsageEvents.Event.MOVE_TO_FOREGROUND) {
result = event.getPackageName()+"/"+event.getClassName();
}
}
if (!android.text.TextUtils.isEmpty(result)) {
return result;
}
}
return "";
}C:\Users\Qiang>adb shell dumpsys activity |findstr "mResume"
mResumedActivity: ActivityRecord{12f93fd u0 com.sohu.inputmethod.sogou/.SogouIMEHomeActivity t50}
C:\Users\Qiang>adb shell dumpsys activity |findstr "mResume"
mResumedActivity: ActivityRecord{12f93fd u0 com.sohu.inputmethod.sogou/.SogouIMEHomeActivity t50}
// getRunningTasks 方法实现
// 最终调用 getTaskService().getTasks
public List<RunningTaskInfo> getRunningTasks(int maxNum) throws SecurityException {
try {
return getTaskService().getTasks(maxNum);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}# getTaskService 方法实现private static IActivityTaskManager getTaskService() {return ActivityTaskManager.getService();
}// getRunningTasks 方法实现
// 最终调用 getTaskService().getTasks
public List<RunningTaskInfo> getRunningTasks(int maxNum) throws SecurityException {
try {
return getTaskService().getTasks(maxNum);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}# getTaskService 方法实现private static IActivityTaskManager getTaskService() {return ActivityTaskManager.getService();
}//getService 实现代码
public static IActivityTaskManager getService() { return IActivityTaskManagerSingleton.get();
}//IActivityTaskManagerSingleton 初始化代码
private static final Singleton<IActivityTaskManager> IActivityTaskManagerSingleton =new Singleton<IActivityTaskManager>() {
@Overrideprotected IActivityTaskManager create() { final IBinder b = ServiceManager.getService(Context.ACTIVITY_TASK_SERVICE);
return IActivityTaskManager.Stub.asInterface(b);
}};//getService 实现代码
public static IActivityTaskManager getService() { return IActivityTaskManagerSingleton.get();
}//IActivityTaskManagerSingleton 初始化代码
private static final Singleton<IActivityTaskManager> IActivityTaskManagerSingleton =new Singleton<IActivityTaskManager>() {
@Overrideprotected IActivityTaskManager create() { final IBinder b = ServiceManager.getService(Context.ACTIVITY_TASK_SERVICE);
return IActivityTaskManager.Stub.asInterface(b);
}};//getTasks 实现代码，调用了 getFilteredTasks
@Overridepublic List<ActivityManager.RunningTaskInfo> getTasks(int maxNum) {
return getFilteredTasks(maxNum, ACTIVITY_TYPE_UNDEFINED, WINDOWING_MODE_UNDEFINED);
}// getFilteredTasks 实现代码
@Overridepublic List<ActivityManager.RunningTaskInfo> getFilteredTasks(int maxNum,@WindowConfiguration.ActivityType int ignoreActivityType,@WindowConfiguration.WindowingMode int ignoreWindowingMode) {
final int callingUid = Binder.getCallingUid();
final int callingPid = Binder.getCallingPid();
final boolean crossUser = isCrossUserAllowed(callingPid, callingUid);
final int[] profileIds = getUserManager().getProfileIds(UserHandle.getUserId(callingUid), true);
ArraySet<Integer> callingProfileIds = new ArraySet<>();
for (int i = 0; i < profileIds.length; i++) {
callingProfileIds.add(profileIds[i]);
}
ArrayList<ActivityManager.RunningTaskInfo> list = new ArrayList<>();
synchronized (mGlobalLock) {
if (DEBUG_ALL) Slog.v(TAG, "getTasks: max=" + maxNum);
final boolean allowed = isGetTasksAllowed("getTasks", callingPid, callingUid);
mRootActivityContainer.getRunningTasks(maxNum, list, ignoreActivityType,
ignoreWindowingMode, callingUid, allowed, crossUser, callingProfileIds);} return list;
}//getTasks 实现代码，调用了 getFilteredTasks
@Overridepublic List<ActivityManager.RunningTaskInfo> getTasks(int maxNum) {
return getFilteredTasks(maxNum, ACTIVITY_TYPE_UNDEFINED, WINDOWING_MODE_UNDEFINED);
}// getFilteredTasks 实现代码
@Overridepublic List<ActivityManager.RunningTaskInfo> getFilteredTasks(int maxNum,@WindowConfiguration.ActivityType int ignoreActivityType,@WindowConfiguration.WindowingMode int ignoreWindowingMode) {
final int callingUid = Binder.getCallingUid();
final int callingPid = Binder.getCallingPid();
final boolean crossUser = isCrossUserAllowed(callingPid, callingUid);
final int[] profileIds = getUserManager().getProfileIds(UserHandle.getUserId(callingUid), true);
ArraySet<Integer> callingProfileIds = new ArraySet<>();
for (int i = 0; i < profileIds.length; i++) {
callingProfileIds.add(profileIds[i]);
}
ArrayList<ActivityManager.RunningTaskInfo> list = new ArrayList<>();
synchronized (mGlobalLock) {
if (DEBUG_ALL) Slog.v(TAG, "getTasks: max=" + maxNum);
final boolean allowed = isGetTasksAllowed("getTasks", callingPid, callingUid);
mRootActivityContainer.getRunningTasks(maxNum, list, ignoreActivityType,
ignoreWindowingMode, callingUid, allowed, crossUser, callingProfileIds);} return list;
}///ADD START
String getTopActivity();///ADD END
///ADD START
[注意]传递专业知识、拓宽行业人脉——看雪讲师团队等你加入！
