adding a hangup button to the dialer

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

@@ -25,6 +25,8 @@ class DialerActivity : SimpleActivity() {
                 }
             }
         }
+
+        dialer_hangup_button.setOnClickListener { finish() }
     }
 
     override fun onResume() {

app/src/main/res/drawable/circle_red_background.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+
+    <solid
+        android:color="@color/theme_dark_red_primary_color"/>
+
+</shape>

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

@@ -47,4 +47,17 @@
         app:layout_constraintTop_toBottomOf="@+id/callee_big_name_number"
         tools:text="123 456 789"/>
 
+    <ImageView
+        android:id="@+id/dialer_hangup_button"
+        android:layout_width="@dimen/dialer_hangup_button_size"
+        android:layout_height="@dimen/dialer_hangup_button_size"
+        android:layout_marginBottom="@dimen/dialer_bottom_margin"
+        android:background="@drawable/circle_red_background"
+        android:elevation="@dimen/medium_margin"
+        android:padding="@dimen/activity_margin"
+        android:src="@drawable/ic_phone_down"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"/>
+
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/dimens.xml

@@ -7,7 +7,9 @@
     <dimen name="contact_item_with_number_height">56dp</dimen>
     <dimen name="create_new_contact_height">68dp</dimen>
     <dimen name="dialpad_button_size">60dp</dimen>
-    <dimen name="dialer_top_margin">150dp</dimen>
+    <dimen name="dialer_hangup_button_size">70dp</dimen>
+    <dimen name="dialer_top_margin">140dp</dimen>
+    <dimen name="dialer_bottom_margin">40dp</dimen>
 
     <dimen name="dialpad_text_size">34sp</dimen>
 </resources>