Enabled swipe left/right to toggle between accounts

app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt

@@ -456,6 +456,40 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
+        swipeRefresh.setOnTouchListener(object : OnSwipeTouchListener(this@MainActivity) {
+
+            override fun onSwipeLeft() {
+                super.onSwipeLeft()
+                if (UserAgent.uas().size > 0) {
+                    val curPos = aorSpinner.selectedItemPosition
+                    val newPos = if (curPos == -1)
+                        0
+                    else
+                        (curPos + 1) % UserAgent.uas().size
+                    if (curPos != newPos) {
+                        aorSpinner.setSelection(newPos)
+                        showCall(UserAgent.uas()[newPos])
+                    }
+                }
+            }
+
+            override fun onSwipeRight() {
+                super.onSwipeRight()
+                if (UserAgent.uas().size > 0) {
+                    val curPos = aorSpinner.selectedItemPosition
+                    val newPos = when (curPos) {
+                        -1 -> 0
+                        0 -> UserAgent.uas().size - 1
+                        else -> curPos - 1
+                    }
+                    if (curPos != newPos) {
+                        aorSpinner.setSelection(newPos)
+                        showCall(UserAgent.uas()[newPos])
+                    }
+                }
+            }
+        })
+
         swipeRefresh.setOnRefreshListener {
             if (UserAgent.uas().size > 0) {
                 if (aorSpinner.selectedItemPosition == -1)

app/src/main/kotlin/com/tutpro/baresip/OnSwipeTouchListener.kt

@@ -0,0 +1,70 @@
+package com.tutpro.baresip
+
+import android.content.Context
+import android.view.GestureDetector
+import android.view.MotionEvent
+import android.view.View
+
+open class OnSwipeTouchListener(ctx: Context) : View.OnTouchListener {
+
+    private val gestureDetector: GestureDetector
+
+    companion object {
+        private val SWIPE_THRESHOLD = 100
+        private val SWIPE_VELOCITY_THRESHOLD = 100
+    }
+
+    init {
+        gestureDetector = GestureDetector(ctx, GestureListener())
+    }
+
+    override fun onTouch(v: View, event: MotionEvent): Boolean {
+        return gestureDetector.onTouchEvent(event)
+    }
+
+    private inner class GestureListener : GestureDetector.SimpleOnGestureListener() {
+
+        override fun onDown(e: MotionEvent): Boolean {
+            return true
+        }
+
+        override fun onFling(e1: MotionEvent, e2: MotionEvent, velocityX: Float, velocityY: Float): Boolean {
+            var result = false
+            try {
+                val diffY = e2.y - e1.y
+                val diffX = e2.x - e1.x
+                if (Math.abs(diffX) > Math.abs(diffY)) {
+                    if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
+                        if (diffX > 0) {
+                            onSwipeRight()
+                        } else {
+                            onSwipeLeft()
+                        }
+                        result = true
+                    }
+                } else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
+                    if (diffY > 0) {
+                        onSwipeBottom()
+                        result = false
+                    } else {
+                        onSwipeTop()
+                        result = true
+                    }
+                }
+            } catch (exception: Exception) {
+                exception.printStackTrace()
+            }
+
+            return result
+        }
+
+    }
+
+    open fun onSwipeRight() {}
+
+    open fun onSwipeLeft() {}
+
+    open fun onSwipeTop() {}
+
+    open fun onSwipeBottom() {}
+}