Use in-app call overlay if system overlay permission wasn't granted

app/src/main/java/org/linphone/activities/call/CallActivity.kt

@@ -86,7 +86,10 @@ class CallActivity : ProximitySensorActivity() {
                     previewY = v.y - event.rawY
                 }
                 MotionEvent.ACTION_MOVE -> {
-                    v.animate().x(event.rawX + previewX).y(event.rawY + previewY).setDuration(0)
+                    v.animate()
+                        .x(event.rawX + previewX)
+                        .y(event.rawY + previewY)
+                        .setDuration(0)
                         .start()
                 }
                 else -> {

app/src/main/java/org/linphone/activities/main/MainActivity.kt

@@ -25,6 +25,7 @@ import android.net.Uri
 import android.os.Bundle
 import android.os.Parcelable
 import android.view.Gravity
+import android.view.MotionEvent
 import android.view.View
 import android.view.inputmethod.InputMethodManager
 import androidx.databinding.DataBindingUtil
@@ -37,6 +38,7 @@ import androidx.navigation.findNavController
 import com.google.android.material.snackbar.Snackbar
 import java.io.UnsupportedEncodingException
 import java.net.URLDecoder
+import kotlin.math.abs
 import kotlinx.coroutines.*
 import org.linphone.LinphoneApplication.Companion.coreContext
 import org.linphone.LinphoneApplication.Companion.corePreferences
@@ -45,6 +47,7 @@ import org.linphone.activities.GenericActivity
 import org.linphone.activities.SnackBarActivity
 import org.linphone.activities.assistant.AssistantActivity
 import org.linphone.activities.call.CallActivity
+import org.linphone.activities.main.viewmodels.CallOverlayViewModel
 import org.linphone.activities.main.viewmodels.SharedMainViewModel
 import org.linphone.activities.navigateToDialer
 import org.linphone.compatibility.Compatibility
@@ -57,6 +60,7 @@ import org.linphone.utils.FileUtils
 class MainActivity : GenericActivity(), SnackBarActivity, NavController.OnDestinationChangedListener {
     private lateinit var binding: MainActivityBinding
     private lateinit var sharedViewModel: SharedMainViewModel
+    private lateinit var callOverlayViewModel: CallOverlayViewModel
 
     private val listener = object : ContactsUpdatedListenerStub() {
         override fun onContactsUpdated() {
@@ -72,6 +76,12 @@ class MainActivity : GenericActivity(), SnackBarActivity, NavController.OnDestin
     private lateinit var tabsFragment: FragmentContainerView
     private lateinit var statusFragment: FragmentContainerView
 
+    private var overlayX = 0f
+    private var overlayY = 0f
+    private var initPosX = 0f
+    private var initPosY = 0f
+    private var overlay: View? = null
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -81,6 +91,9 @@ class MainActivity : GenericActivity(), SnackBarActivity, NavController.OnDestin
         sharedViewModel = ViewModelProvider(this).get(SharedMainViewModel::class.java)
         binding.viewModel = sharedViewModel
 
+        callOverlayViewModel = ViewModelProvider(this).get(CallOverlayViewModel::class.java)
+        binding.callOverlayViewModel = callOverlayViewModel
+
         sharedViewModel.toggleDrawerEvent.observe(this, {
             it.consume {
                 if (binding.sideMenu.isDrawerOpen(Gravity.LEFT)) {
@@ -112,6 +125,8 @@ class MainActivity : GenericActivity(), SnackBarActivity, NavController.OnDestin
 
         tabsFragment = findViewById(R.id.tabs_fragment)
         statusFragment = findViewById(R.id.status_fragment)
+
+        initOverlay()
     }
 
     override fun onNewIntent(intent: Intent?) {
@@ -403,4 +418,39 @@ class MainActivity : GenericActivity(), SnackBarActivity, NavController.OnDestin
             Log.e("[Main Activity] Failed to parse shortcut/locus id: $id")
         }
     }
+
+    private fun initOverlay() {
+        overlay = binding.root.findViewById(R.id.call_overlay)
+        val callOverlay = overlay
+        callOverlay ?: return
+
+        callOverlay.setOnTouchListener { view, event ->
+            when (event.action) {
+                MotionEvent.ACTION_DOWN -> {
+                    overlayX = view.x - event.rawX
+                    overlayY = view.y - event.rawY
+                    initPosX = view.x
+                    initPosY = view.y
+                }
+                MotionEvent.ACTION_MOVE -> {
+                    view.animate()
+                        .x(event.rawX + overlayX)
+                        .y(event.rawY + overlayY)
+                        .setDuration(0)
+                        .start()
+                }
+                MotionEvent.ACTION_UP -> {
+                    if (abs(initPosX - view.x) < 5 && abs(initPosY - view.y) < 5) {
+                        view.performClick()
+                    }
+                }
+                else -> return@setOnTouchListener false
+            }
+            true
+        }
+
+        callOverlay.setOnClickListener {
+            coreContext.onCallStarted()
+        }
+    }
 }

app/src/main/java/org/linphone/activities/main/recordings/fragments/RecordingsFragment.kt

@@ -85,7 +85,11 @@ class RecordingsFragment : MasterFragment<RecordingsFragmentBinding, RecordingsL
                     videoY = v.y - event.rawY
                 }
                 MotionEvent.ACTION_MOVE -> {
-                    v.animate().x(event.rawX + videoX).y(event.rawY + videoY).setDuration(0).start()
+                    v.animate()
+                        .x(event.rawX + videoX)
+                        .y(event.rawY + videoY)
+                        .setDuration(0)
+                        .start()
                 }
                 else -> {
                     v.performClick()

app/src/main/java/org/linphone/activities/main/viewmodels/CallOverlayViewModel.kt

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2010-2021 Belledonne Communications SARL.
+ *
+ * This file is part of linphone-android
+ * (see https://www.linphone.org).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.linphone.activities.main.viewmodels
+
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import org.linphone.LinphoneApplication.Companion.coreContext
+import org.linphone.LinphoneApplication.Companion.corePreferences
+import org.linphone.core.Call
+import org.linphone.core.Core
+import org.linphone.core.CoreListenerStub
+
+class CallOverlayViewModel : ViewModel() {
+    val displayCallOverlay = MutableLiveData<Boolean>()
+
+    private val listener = object : CoreListenerStub() {
+        override fun onCallStateChanged(
+            core: Core,
+            call: Call,
+            state: Call.State,
+            message: String
+        ) {
+            if (state == Call.State.IncomingReceived || state == Call.State.OutgoingInit) {
+                createCallOverlay()
+            } else if (state == Call.State.End || state == Call.State.Error || state == Call.State.Released) {
+                if (core.callsNb == 0) {
+                    removeCallOverlay()
+                }
+            }
+        }
+    }
+
+    init {
+        displayCallOverlay.value = coreContext.core.callsNb > 0
+
+        coreContext.core.addListener(listener)
+    }
+
+    override fun onCleared() {
+        coreContext.core.removeListener(listener)
+
+        super.onCleared()
+    }
+
+    private fun createCallOverlay() {
+        // If system-wide call overlay is enabled or if already visible, abort
+        if (corePreferences.showCallOverlay) {
+            return
+        }
+
+        displayCallOverlay.value = true
+    }
+
+    private fun removeCallOverlay() {
+        displayCallOverlay.value = false
+    }
+}

app/src/main/java/org/linphone/core/CoreContext.kt

@@ -654,7 +654,7 @@ class CoreContext(val context: Context, coreConfig: Config) {
         context.startActivity(intent)
     }
 
-    private fun onCallStarted() {
+    fun onCallStarted() {
         if (corePreferences.preventInterfaceFromShowingUp) {
             Log.w("[Context] We were asked to not show the call screen")
             return

app/src/main/res/layout-land/main_activity_content.xml

@@ -1,8 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <data>
+        <variable
+            name="callOverlayViewModel"
+            type="org.linphone.activities.main.viewmodels.CallOverlayViewModel" />
+    </data>
+
+    <RelativeLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_alignParentBottom="true">
@@ -14,6 +21,10 @@
             android:layout_height="match_parent"
             android:layout_toRightOf="@id/tabs_fragment">
 
+            <RelativeLayout
+                android:layout_width="match_parent"
+                android:layout_height="match_parent">
+
                 <androidx.fragment.app.FragmentContainerView
                     android:id="@+id/nav_host_fragment"
                     android:layout_width="match_parent"
@@ -23,6 +34,13 @@
                     app:navGraph="@navigation/main_nav_graph"
                     tools:layout="@layout/dialer_fragment" />
 
+                <include
+                    android:id="@+id/call_overlay"
+                    layout="@layout/call_overlay"
+                    tools:visibility="@{callOverlayViewModel.displayCallOverlay}"/>
+
+            </RelativeLayout>
+
         </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
         <androidx.fragment.app.FragmentContainerView
@@ -33,4 +51,6 @@
             android:layout_alignParentLeft="true"
             tools:layout="@layout/tabs_fragment"/>
 
-</RelativeLayout>
+    </RelativeLayout>
+
+</layout>

app/src/main/res/layout/call_overlay.xml

@@ -1,7 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<layout xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <data>
+        <import type="android.view.View" />
+        <variable
+            name="visibility"
+            type="Boolean" />
+    </data>
+
+    <RelativeLayout
         android:layout_width="wrap_content"
-    android:layout_height="wrap_content">
+        android:layout_height="wrap_content"
+        android:visibility="@{visibility ? View.VISIBLE : View.GONE}">
 
         <ImageView
             android:layout_width="60dp"
@@ -12,4 +22,6 @@
             android:padding="10dp"
             android:src="@drawable/call_back" />
 
-</RelativeLayout>
+    </RelativeLayout>
+
+</layout>

app/src/main/res/layout/main_activity.xml

@@ -10,6 +10,9 @@
         <variable
             name="viewModel"
             type="org.linphone.activities.main.viewmodels.SharedMainViewModel" />
+        <variable
+            name="callOverlayViewModel"
+            type="org.linphone.activities.main.viewmodels.CallOverlayViewModel" />
     </data>
 
     <androidx.coordinatorlayout.widget.CoordinatorLayout
@@ -35,7 +38,10 @@
                 android:layout_height="match_parent"
                 android:layout_below="@id/status_fragment">
 
-                <include android:id="@+id/content" layout="@layout/main_activity_content" />
+                <include
+                    android:id="@+id/content"
+                    layout="@layout/main_activity_content"
+                    tools:callOverlayViewModel="@{callOverlayViewModel}"/>
 
                 <!-- Side Menu -->
                 <RelativeLayout

app/src/main/res/layout/main_activity_content.xml

@@ -1,8 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <data>
+        <variable
+            name="callOverlayViewModel"
+            type="org.linphone.activities.main.viewmodels.CallOverlayViewModel" />
+    </data>
+
+    <RelativeLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_alignParentBottom="true">
@@ -14,6 +21,10 @@
             android:layout_height="match_parent"
             android:layout_above="@id/tabs_fragment">
 
+            <RelativeLayout
+                android:layout_width="match_parent"
+                android:layout_height="match_parent">
+
                 <androidx.fragment.app.FragmentContainerView
                     android:id="@+id/nav_host_fragment"
                     android:layout_width="match_parent"
@@ -23,6 +34,13 @@
                     app:navGraph="@navigation/main_nav_graph"
                     tools:layout="@layout/dialer_fragment" />
 
+                <include
+                    android:id="@+id/call_overlay"
+                    layout="@layout/call_overlay"
+                    tools:visibility="@{callOverlayViewModel.displayCallOverlay}" />
+
+            </RelativeLayout>
+
         </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
         <androidx.fragment.app.FragmentContainerView
@@ -33,4 +51,6 @@
             android:layout_alignParentBottom="true"
             tools:layout="@layout/tabs_fragment"/>
 
-</RelativeLayout>
+    </RelativeLayout>
+
+</layout>