I'm trying to create an app ("ShowStack") to view the current App Back Stack (for development purposes). I know it can be done by using adb with the command "adb shell dumpsys activity activities". I tried using ActivityManager functions getAppTasks() and getRunningProcesses, etc. But these only return a list of 1 item, the current app/task "ShowStack", which I already knew thank you.
How can I view all tasks/activities?
There's no API that lets you peek the whole backstack. Unless you are targeting rooted devices, you are most likely out of luck as there's no way to inspect that for security/privacy reasons.
You can write your own using Application.ActivityLifecycleCallbacks:
class MyApp : Application() {
override fun onCreate() {
super.onCreate()
ActivityBackStackTracker.install(this)
}
}
class ActivityBackStackTracker : Application.ActivityLifecycleCallbacks {
override fun onActivityCreated(activity: Activity, bundle: Bundle?) {
activityStack.add(activity::class)
}
override fun onActivityDestroyed(activity: Activity) {
activityStack.remove(activity::class)
}
//..
companion object {
private val activityStack = mutableListOf<KClass<out Activity>>()
fun getCurrentActivityStack() = listOf(activityStack)
fun install(app: Application) {
app.registerActivityLifecycleCallbacks(ActivityBackStackTracker())
}
}
}
