69 lines
2.3 KiB
Kotlin
69 lines
2.3 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.session
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import android.app.Activity
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import android.app.ActivityManager
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import android.app.Application
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import android.content.Context
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import android.os.Bundle
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import org.mozilla.fenix.FenixApplication
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/**
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* This ActivityLifecycleCallbacks implementations tracks if there is at least one activity in the
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* STARTED state (meaning some part of our application is visible).
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* Based on this information the current task can be removed if the app is not visible.
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*/
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@SuppressWarnings("EmptyFunctionBlock")
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class VisibilityLifecycleCallback(private val activityManager: ActivityManager?) :
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Application.ActivityLifecycleCallbacks {
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/**
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* Activities are not stopped/started in an ordered way. So we are using
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*/
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private var activitiesInStartedState: Int = 0
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private fun finishAndRemoveTaskIfInBackground(): Boolean {
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if (activitiesInStartedState == 0) {
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activityManager?.let {
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for (task in it.appTasks) {
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task.finishAndRemoveTask()
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}
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return true
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}
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}
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return false
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}
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override fun onActivityStarted(activity: Activity?) {
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activitiesInStartedState++
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}
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override fun onActivityStopped(activity: Activity?) {
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activitiesInStartedState--
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}
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override fun onActivityResumed(activity: Activity?) {}
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override fun onActivityPaused(activity: Activity?) {}
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override fun onActivityCreated(activity: Activity?, bundle: Bundle?) {}
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override fun onActivitySaveInstanceState(activity: Activity?, bundle: Bundle?) {}
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override fun onActivityDestroyed(activity: Activity?) {}
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companion object {
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/**
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* If all activities of this app are in the background then finish and remove all tasks. After
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* that the app won't show up in "recent apps" anymore.
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*/
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internal fun finishAndRemoveTaskIfInBackground(context: Context): Boolean {
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return (context.applicationContext as FenixApplication)
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.visibilityLifecycleCallback?.finishAndRemoveTaskIfInBackground() ?: false
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}
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}
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}
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