add hold

app/src/main/kotlin/com/simplemobiletools/dialer/activities/CallActivity.kt

@@ -131,6 +131,18 @@ class CallActivity : SimpleActivity() {
             dialpad_wrapper.beGone()
         }
 
+        call_toggle_hold.setOnClickListener {
+            toggleHold()
+        }
+
+        call_conference.setOnClickListener {
+            /*if (is conference) {
+                // show manage conference screen
+            } else {
+                // show dialpad and contacts
+            }*/
+        }
+
         call_end.setOnClickListener {
             endCall()
         }
@@ -306,6 +318,12 @@ class CallActivity : SimpleActivity() {
         }
     }
 
+    private fun toggleHold() {
+        val isOnHold = CallManager.toggleHold()
+        val drawable = if (!isOnHold) R.drawable.ic_play_vector else R.drawable.ic_pause_vector
+        call_toggle_hold.setImageDrawable(getDrawable(drawable))
+    }
+
     private fun updateOtherPersonsInfo(avatar: Bitmap?) {
         if (callContact == null) {
             return

app/src/main/kotlin/com/simplemobiletools/dialer/helpers/CallManager.kt

@@ -32,6 +32,16 @@ class CallManager {
             }
         }
 
+        fun toggleHold(): Boolean {
+            val isOnHold = getState() == Call.STATE_HOLDING
+            if (isOnHold) {
+                call?.unhold()
+            } else {
+                call?.hold()
+            }
+            return !isOnHold
+        }
+
         fun registerCallback(callback: Call.Callback) {
             call?.registerCallback(callback)
         }

app/src/main/kotlin/com/simplemobiletools/dialer/services/CallService.kt

@@ -2,6 +2,7 @@ package com.simplemobiletools.dialer.services
 
 import android.telecom.Call
 import android.telecom.InCallService
+import android.util.Log
 import com.simplemobiletools.dialer.activities.CallActivity
 import com.simplemobiletools.dialer.extensions.powerManager
 import com.simplemobiletools.dialer.helpers.CallManager
@@ -13,6 +14,7 @@ class CallService : InCallService() {
     private val callListener = object : Call.Callback() {
         override fun onStateChanged(call: Call, state: Int) {
             super.onStateChanged(call, state)
+            Log.d("CallService", "onStateChanged: $call")
             if (state != Call.STATE_DISCONNECTED) {
                 callNotificationManager.setupNotification()
             }

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

@@ -106,7 +106,7 @@
             app:layout_constraintHorizontal_bias="0.15"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            app:layout_constraintVertical_bias="0.75" />
+            app:layout_constraintVertical_bias="0.6" />
 
         <ImageView
             android:id="@+id/call_toggle_speaker"
@@ -119,7 +119,7 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            app:layout_constraintVertical_bias="0.75" />
+            app:layout_constraintVertical_bias="0.6" />
 
         <ImageView
             android:id="@+id/call_dialpad"
@@ -134,7 +134,33 @@
             app:layout_constraintHorizontal_bias="0.85"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            app:layout_constraintVertical_bias="0.75" />
+            app:layout_constraintVertical_bias="0.6" />
+
+        <ImageView
+            android:id="@+id/call_toggle_hold"
+            android:layout_width="@dimen/dialpad_button_size"
+            android:layout_height="@dimen/dialpad_button_size"
+            android:layout_marginTop="@dimen/bigger_margin"
+            android:background="?attr/selectableItemBackgroundBorderless"
+            android:padding="@dimen/medium_margin"
+            android:src="@drawable/ic_pause_vector"
+            app:layout_constraintEnd_toStartOf="@+id/call_conference"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/call_toggle_speaker" />
+
+        <ImageView
+            android:id="@+id/call_conference"
+            android:layout_width="@dimen/dialpad_button_size"
+            android:layout_height="@dimen/dialpad_button_size"
+            android:layout_marginTop="@dimen/bigger_margin"
+            android:background="?attr/selectableItemBackgroundBorderless"
+            android:padding="@dimen/medium_margin"
+            android:src="@drawable/ic_plus_vector"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toEndOf="@+id/call_toggle_hold"
+            app:layout_constraintTop_toBottomOf="@+id/call_toggle_speaker" />
 
         <ImageView
             android:id="@+id/call_end"