Added swipe to answer an incoming call (#127)

fix #127

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

@@ -11,6 +11,7 @@ import android.os.Handler
 import android.os.PowerManager
 import android.telecom.Call
 import android.telecom.CallAudioState
+import android.view.MotionEvent
 import android.view.WindowManager
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.MINUTE_SECONDS
@@ -45,6 +46,7 @@ class CallActivity : SimpleActivity() {
     private var callDuration = 0
     private val callContactAvatarHelper by lazy { CallContactAvatarHelper(this) }
     private val callDurationHelper by lazy { (application as App).callDurationHelper }
+    private var dragDownX = 0f
 
     override fun onCreate(savedInstanceState: Bundle?) {
         supportActionBar?.hide()
@@ -94,12 +96,19 @@ class CallActivity : SimpleActivity() {
     }
 
     private fun initButtons() {
-        call_decline.setOnClickListener {
-            endCall()
-        }
+        if (config.enableSwipeToAnswer) {
+            handleSwipe()
+        } else {
+            call_draggable.beGone()
+            call_draggable_background.beGone()
 
-        call_accept.setOnClickListener {
-            acceptCall()
+            call_decline.setOnClickListener {
+                endCall()
+            }
+
+            call_accept.setOnClickListener {
+                acceptCall()
+            }
         }
 
         call_toggle_microphone.setOnClickListener {
@@ -145,6 +154,55 @@ class CallActivity : SimpleActivity() {
         call_sim_id.setTextColor(config.textColor.getContrastColor())
     }
 
+    @SuppressLint("ClickableViewAccessibility")
+    private fun handleSwipe() {
+        var minDragX = 0f
+        var maxDragX = 0f
+        var initialDraggableX = 0f
+
+        call_accept.onGlobalLayout {
+            minDragX = call_decline.left.toFloat()
+            maxDragX = call_accept.left.toFloat()
+            initialDraggableX = call_draggable.left.toFloat()
+        }
+
+        call_draggable.setOnTouchListener { v, event ->
+            when (event.action) {
+                MotionEvent.ACTION_DOWN -> {
+                    dragDownX = event.x
+                    call_draggable_background.animate().alpha(0f)
+                }
+                MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
+                    dragDownX = 0f
+                    call_draggable.animate().x(initialDraggableX).withEndAction {
+                        call_draggable_background.animate().alpha(0.2f)
+                    }
+                    call_draggable.setImageDrawable(getDrawable(R.drawable.ic_phone_down_vector))
+                }
+                MotionEvent.ACTION_MOVE -> {
+                    call_draggable.x = Math.min(maxDragX, Math.max(minDragX, event.rawX - dragDownX))
+                    when {
+                        call_draggable.x >= maxDragX - 50f -> {
+                            call_draggable.performHapticFeedback()
+                            acceptCall()
+                        }
+                        call_draggable.x <= minDragX + 50f -> {
+                            call_draggable.performHapticFeedback()
+                            endCall()
+                        }
+                        call_draggable.x > initialDraggableX -> {
+                            call_draggable.setImageDrawable(getDrawable(R.drawable.ic_phone_green_vector))
+                        }
+                        call_draggable.x <= initialDraggableX -> {
+                            call_draggable.setImageDrawable(getDrawable(R.drawable.ic_phone_down_red_vector))
+                        }
+                    }
+                }
+            }
+            true
+        }
+    }
+
     private fun dialpadPressed(char: Char) {
         CallManager.keypad(char)
         dialpad_input.addCharacter(char)

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

@@ -40,6 +40,7 @@ class SettingsActivity : SimpleActivity() {
         setupStartNameWithSurname()
         setupShowCallConfirmation()
         setupDisableProximitySensor()
+        setupEnableSwipeToAnswer()
         updateTextColors(settings_holder)
         invalidateOptionsMenu()
 
@@ -220,4 +221,12 @@ class SettingsActivity : SimpleActivity() {
             config.disableProximitySensor = settings_disable_proximity_sensor.isChecked
         }
     }
+
+    private fun setupEnableSwipeToAnswer() {
+        settings_enable_swipe_to_answer.isChecked = config.enableSwipeToAnswer
+        settings_enable_swipe_to_answer_holder.setOnClickListener {
+            settings_enable_swipe_to_answer.toggle()
+            config.enableSwipeToAnswer = settings_enable_swipe_to_answer.isChecked
+        }
+    }
 }

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

@@ -52,6 +52,10 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getBoolean(DISABLE_PROXIMITY_SENSOR, false)
         set(disableProximitySensor) = prefs.edit().putBoolean(DISABLE_PROXIMITY_SENSOR, disableProximitySensor).apply()
 
+    var enableSwipeToAnswer: Boolean
+        get() = prefs.getBoolean(ENABLE_SWIPE_TO_ANSWER, false)
+        set(enableSwipeToAnswer) = prefs.edit().putBoolean(ENABLE_SWIPE_TO_ANSWER, enableSwipeToAnswer).apply()
+
     var showTabs: Int
         get() = prefs.getInt(SHOW_TABS, ALL_TABS_MASK)
         set(showTabs) = prefs.edit().putInt(SHOW_TABS, showTabs).apply()

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

@@ -10,6 +10,7 @@ const val REMEMBER_SIM_PREFIX = "remember_sim_"
 const val GROUP_SUBSEQUENT_CALLS = "group_subsequent_calls"
 const val OPEN_DIAL_PAD_AT_LAUNCH = "open_dial_pad_at_launch"
 const val DISABLE_PROXIMITY_SENSOR = "disable_proximity_sensor"
+const val ENABLE_SWIPE_TO_ANSWER = "enable_swipe_to_answer"
 const val SHOW_TABS = "show_tabs"
 
 const val ALL_TABS_MASK = TAB_CONTACTS or TAB_FAVORITES or TAB_CALL_HISTORY