show a dialpad at the call screen on button press

app/src/main/kotlin/com/simplemobiletools/contacts/pro/activities/CallActivity.kt

@@ -23,6 +23,7 @@ import com.simplemobiletools.commons.helpers.isOreoPlus
 import com.simplemobiletools.commons.helpers.isQPlus
 import com.simplemobiletools.contacts.pro.R
 import com.simplemobiletools.contacts.pro.extensions.audioManager
+import com.simplemobiletools.contacts.pro.extensions.config
 import com.simplemobiletools.contacts.pro.helpers.ACCEPT_CALL
 import com.simplemobiletools.contacts.pro.helpers.CallManager
 import com.simplemobiletools.contacts.pro.helpers.DECLINE_CALL
@@ -77,7 +78,13 @@ class CallActivity : SimpleActivity() {
     }
 
     override fun onBackPressed() {
-        super.onBackPressed()
+        if (dialpad_wrapper.isVisible()) {
+            dialpad_wrapper.beGone()
+            return
+        } else {
+            super.onBackPressed()
+        }
+
         if (CallManager.getState() == Call.STATE_DIALING) {
             endCall()
         }
@@ -100,10 +107,15 @@ class CallActivity : SimpleActivity() {
             toggleSpeaker()
         }
 
-        call_dialpad.setOnClickListener { }
+        call_dialpad.setOnClickListener {
+            toggleDialpadVisibility()
+        }
+
         call_end.setOnClickListener {
             endCall()
         }
+
+        dialpad_wrapper.setBackgroundColor(config.backgroundColor)
     }
 
     private fun toggleSpeaker() {
@@ -120,6 +132,14 @@ class CallActivity : SimpleActivity() {
         audioManager.isMicrophoneMute = !isMicrophoneOn
     }
 
+    private fun toggleDialpadVisibility() {
+        if (dialpad_wrapper.isVisible()) {
+            dialpad_wrapper.beGone()
+        } else {
+            dialpad_wrapper.beVisible()
+        }
+    }
+
     private fun updateOtherPersonsInfo() {
         if (callContact == null) {
             return

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

@@ -44,8 +44,7 @@
     <androidx.constraintlayout.widget.ConstraintLayout
         android:id="@+id/ongoing_call_holder"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="match_parent">
-        android:visibility="gone">
 
         <ImageView
             android:id="@+id/call_toggle_microphone"
@@ -156,4 +155,18 @@
             app:layout_constraintTop_toBottomOf="@+id/call_accept" />
 
     </androidx.constraintlayout.widget.ConstraintLayout>
+
+    <RelativeLayout
+        android:id="@+id/dialpad_wrapper"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_marginBottom="@dimen/activity_margin"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/call_status_label">
+
+        <include layout="@layout/dialpad" />
+
+    </RelativeLayout>
+
 </androidx.constraintlayout.widget.ConstraintLayout>