copying some Call screen related things from Simple Contacts

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

@@ -0,0 +1,70 @@
+package com.simplemobiletools.dialer.helpers
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.net.Uri
+import android.telecom.Call
+import android.telecom.VideoProfile
+import com.simplemobiletools.commons.helpers.SimpleContactsHelper
+import com.simplemobiletools.dialer.models.CallContact
+
+// inspired by https://github.com/Chooloo/call_manage
+@SuppressLint("NewApi")
+class CallManager {
+    companion object {
+        var call: Call? = null
+
+        fun accept() {
+            call?.answer(VideoProfile.STATE_AUDIO_ONLY)
+        }
+
+        fun reject() {
+            if (call != null) {
+                if (call!!.state == Call.STATE_RINGING) {
+                    call!!.reject(false, null)
+                } else {
+                    call!!.disconnect()
+                }
+            }
+        }
+
+        fun registerCallback(callback: Call.Callback) {
+            if (call != null) {
+                call!!.registerCallback(callback)
+            }
+        }
+
+        fun unregisterCallback(callback: Call.Callback) {
+            call?.unregisterCallback(callback)
+        }
+
+        fun getState() = if (call == null) {
+            Call.STATE_DISCONNECTED
+        } else {
+            call!!.state
+        }
+
+        fun keypad(c: Char) {
+            call?.playDtmfTone(c)
+            call?.stopDtmfTone()
+        }
+
+        fun getCallContact(context: Context, callback: (CallContact?) -> Unit) {
+            val callContact = CallContact("", "", "")
+            if (call == null || call!!.details == null || call!!.details!!.handle == null) {
+                callback(callContact)
+                return
+            }
+
+            val uri = Uri.decode(call!!.details.handle.toString())
+            if (uri.startsWith("tel:")) {
+                val number = uri.substringAfter("tel:")
+                callContact.number = number
+                callContact.name = SimpleContactsHelper(context).getNameFromPhoneNumber(number)
+                callContact.photoUri = SimpleContactsHelper(context).getPhotoUriFromPhoneNumber(number)
+
+                callback(callContact)
+            }
+        }
+    }
+}