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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
package org.mozilla.focus.session
import android.app.Activity
import android.app.ActivityManager
import android.app.Application.ActivityLifecycleCallbacks
import android.content.ComponentCallbacks2
import android.content.Context
import android.content.res.Configuration
import android.os.Bundle
import org.mozilla.focus.FocusApplication
import org.mozilla.focus.appreview.AppReviewUtils.Companion.addAppOpenings
/**
* This ActivityLifecycleCallbacks implementations tracks if there is at least one activity in the
* STARTED state (meaning some part of our application is visible).
* Based on this information the current task can be removed if the app is not visible.
*/
@Suppress("TooManyFunctions", "EmptyFunctionBlock")
class VisibilityLifeCycleCallback(private val context: Context) : ActivityLifecycleCallbacks, ComponentCallbacks2 {
/**
* Activities are not stopped/started in an ordered way. So we are using
*/
private var activitiesInStartedState = 0
private var appInForeground = false
private fun finishAndRemoveTaskIfInBackground() {
if (activitiesInStartedState == 0) {
val activityManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
for (task in activityManager.appTasks) {
task.finishAndRemoveTask()
}
}
}
override fun onActivityStarted(activity: Activity) {
activitiesInStartedState++
}
override fun onActivityStopped(activity: Activity) {
activitiesInStartedState--
}
override fun onActivityResumed(activity: Activity) {}
override fun onActivityPaused(activity: Activity) {}
override fun onActivityCreated(activity: Activity, bundle: Bundle?) {
if (!appInForeground) {
appInForeground = true
addAppOpenings(context)
}
}
override fun onActivitySaveInstanceState(activity: Activity, bundle: Bundle) {}
override fun onActivityDestroyed(activity: Activity) {}
override fun onTrimMemory(level: Int) {
if (level == ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) {
appInForeground = false
}
}
override fun onConfigurationChanged(newConfig: Configuration) {}
override fun onLowMemory() {}
companion object {
/**
* If all activities of this app are in the background then finish and remove all tasks. After
* that the app won't show up in "recent apps" anymore.
*/
fun finishAndRemoveTaskIfInBackground(context: Context) {
(context.applicationContext as FocusApplication)
.visibilityLifeCycleCallback
?.finishAndRemoveTaskIfInBackground()
}
fun isInBackground(context: Context): Boolean {
return (context.applicationContext as FocusApplication)
.visibilityLifeCycleCallback?.activitiesInStartedState == 0
}
}
}