show a timer at established calls

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

@@ -10,6 +10,7 @@ import android.hardware.SensorEventListener
 import android.hardware.SensorManager
 import android.net.Uri
 import android.os.Bundle
+import android.os.Handler
 import android.os.PowerManager
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import com.simplemobiletools.commons.extensions.*
@@ -27,9 +28,12 @@ class DialerActivity : SimpleActivity(), SensorEventListener {
 
     private var number = ""
     private var isIncomingCall = false
+    private var isCallActive = false
+    private var callDuration = 0
     private var sensorManager: SensorManager? = null
     private var proximity: Sensor? = null
     private var proximityWakeLock: PowerManager.WakeLock? = null
+    private var timerHandler = Handler()
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -64,6 +68,11 @@ class DialerActivity : SimpleActivity(), SensorEventListener {
         sensorManager!!.unregisterListener(this)
     }
 
+    override fun onDestroy() {
+        super.onDestroy()
+        timerHandler.removeCallbacksAndMessages(null)
+    }
+
     private val messageReceiver = object : BroadcastReceiver() {
         override fun onReceive(context: Context, intent: Intent) {
             if (intent.extras?.containsKey(CALL_STATUS) == true) {
@@ -121,13 +130,29 @@ class DialerActivity : SimpleActivity(), SensorEventListener {
     }
 
     private fun statusActive() {
+        isCallActive = true
+        dialer_call_duration.beVisible()
+        updateCallDuration()
+
         dialer_label.text = ""
         dialer_hangup_button.beVisible()
         dialer_incoming_accept.beGone()
         dialer_incoming_decline.beGone()
     }
 
+    private fun updateCallDuration() {
+        dialer_call_duration.text = callDuration.getFormattedDuration()
+        timerHandler.postDelayed({
+            if (isCallActive) {
+                callDuration++
+                updateCallDuration()
+            }
+        }, 1000)
+    }
+
     private fun statusDisconnected() {
+        isCallActive = false
+        timerHandler.removeCallbacksAndMessages(null)
         dialer_hangup_button.beGone()
         dialer_hangup_button.postDelayed({
             finish()

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

@@ -47,6 +47,21 @@
         app:layout_constraintTop_toBottomOf="@+id/dialer_big_name_number"
         tools:text="123 456 789"/>
 
+    <com.simplemobiletools.commons.views.MyTextView
+        android:id="@+id/dialer_call_duration"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="@dimen/medium_margin"
+        android:gravity="center_horizontal"
+        android:paddingLeft="@dimen/activity_margin"
+        android:paddingRight="@dimen/activity_margin"
+        android:textSize="@dimen/big_text_size"
+        android:visibility="gone"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/dialer_number"
+        tools:text="00:00"/>
+
     <ImageView
         android:id="@+id/dialer_hangup_button"
         android:layout_width="@dimen/dialer_hangup_button_size"