Use androidx.lifecycle to check if application is visible

Set audio mode to normal when no calls and main activity is not visible

app/build.gradle

@@ -56,4 +56,5 @@ dependencies {
     implementation "androidx.exifinterface:exifinterface:1.3.3"
     implementation "androidx.core:core-ktx:1.6.0"
     implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1'
+    implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
 }

app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt

@@ -745,6 +745,10 @@ class BaresipService: Service() {
                         }
                         Log.d(TAG, "AoR $aor call $callp is closed")
                         stopRinging()
+                        if (isMainVisible)
+                            am.mode = AudioManager.MODE_IN_COMMUNICATION
+                        else
+                            am.mode = AudioManager.MODE_NORMAL
                         stopMediaPlayer()
                         when (ev[2]) {
                             "busy" ->
@@ -1385,6 +1389,7 @@ class BaresipService: Service() {
         var logLevel = 2
         var sipTrace = false
         var callActionUri = ""
+        var isMainVisible = false
 
         val uas = ArrayList<UserAgent>()
         val status = ArrayList<Int>()

app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt

@@ -795,7 +795,7 @@ class MainActivity : AppCompatActivity() {
         // Keep the app in communication mode in order to avoid audio delay when the mode changes
         if (am.mode != AudioManager.MODE_RINGTONE && am.mode != AudioManager.MODE_IN_COMMUNICATION)
             am.mode = AudioManager.MODE_IN_COMMUNICATION
-        visible = true
+        BaresipService.isMainVisible = true
         when (resumeAction) {
             "call show" ->
                 handleServiceEvent("call incoming",
@@ -849,7 +849,9 @@ class MainActivity : AppCompatActivity() {
     override fun onPause() {
         Log.d(TAG, "Main onPause")
         Utils.addActivity("main")
-        visible = false
+        if (Call.calls().size == 0)
+            am.mode = AudioManager.MODE_NORMAL
+        BaresipService.isMainVisible = false
         saveCallUri()
         super.onPause()
     }
@@ -971,7 +973,7 @@ class MainActivity : AppCompatActivity() {
                             Api.ua_hangup(uap, callp, 486, "Busy Here")
                             return
                         }
-                        if (visible) {
+                        if (BaresipService.isMainVisible) {
                             if (aor != aorSpinner.tag)
                                 spinToAor(aor)
                             showCall(ua)
@@ -1862,10 +1864,7 @@ class MainActivity : AppCompatActivity() {
     companion object {
 
         var accountRequest: ActivityResultLauncher<Intent>? = null
-
-        var visible = false
         var activityAor = ""
-
         // <aor, password> of those accounts that have auth username without auth password
         val aorPasswords = mutableMapOf<String, String>()
 

app/src/main/kotlin/com/tutpro/baresip/Utils.kt

@@ -1,7 +1,6 @@
 package com.tutpro.baresip
 
 import android.app.Activity
-import android.app.ActivityManager
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
@@ -25,6 +24,8 @@ import androidx.annotation.RequiresApi
 import androidx.appcompat.app.AlertDialog
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.ProcessLifecycleOwner
 import java.io.*
 import java.lang.reflect.Method
 import java.security.SecureRandom
@@ -295,9 +296,7 @@ object Utils {
     }
 
     fun isVisible(): Boolean {
-        val appProcessInfo = ActivityManager.RunningAppProcessInfo()
+        return ProcessLifecycleOwner.get().lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED)
-        ActivityManager.getMyMemoryState(appProcessInfo)
-        return appProcessInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND
     }
 
     fun isHotSpotOn(wm: WifiManager): Boolean {