do not ignore density at setting move gesture threshold

app/src/main/kotlin/com/simplemobiletools/launcher/activities/MainActivity.kt

@@ -56,6 +56,7 @@ class MainActivity : SimpleActivity(), FlingListener {
     private var mAllAppsFragmentY = 0
     private var mWidgetsFragmentY = 0
     private var mScreenHeight = 0
+    private var mMoveGestureThreshold = 0
     private var mIgnoreUpEvent = false
     private var mIgnoreMoveEvents = false
     private var mLongPressedIcon: HomeScreenGridItem? = null
@@ -89,6 +90,7 @@ class MainActivity : SimpleActivity(), FlingListener {
         mScreenHeight = realScreenSize.y
         mAllAppsFragmentY = mScreenHeight
         mWidgetsFragmentY = mScreenHeight
+        mMoveGestureThreshold = resources.getDimension(R.dimen.move_gesture_threshold).toInt()
 
         arrayOf(all_apps_fragment as MyFragment, widgets_fragment as MyFragment).forEach { fragment ->
             fragment.setupFragment(this)
@@ -239,7 +241,11 @@ class MainActivity : SimpleActivity(), FlingListener {
             mLastUpEvent = System.currentTimeMillis()
         }
 
-        mDetector.onTouchEvent(event)
+        try {
+            mDetector.onTouchEvent(event)
+        } catch (ignored: Exception) {
+        }
+
         when (event.actionMasked) {
             MotionEvent.ACTION_DOWN -> {
                 mTouchDownX = event.x.toInt()
@@ -250,7 +256,15 @@ class MainActivity : SimpleActivity(), FlingListener {
             }
 
             MotionEvent.ACTION_MOVE -> {
-                val hasFingerMoved = hasFingerMoved(event)
+                // if the initial gesture was handled by some other view, fix the Down values
+                val hasFingerMoved = if (mTouchDownX == -1 || mTouchDownY == -1) {
+                    mTouchDownX = event.x.toInt()
+                    mTouchDownY = event.y.toInt()
+                    false
+                } else {
+                    hasFingerMoved(event)
+                }
+
                 if (mLongPressedIcon != null && mOpenPopupMenu != null && hasFingerMoved) {
                     mOpenPopupMenu?.dismiss()
                     mOpenPopupMenu = null
@@ -308,7 +322,7 @@ class MainActivity : SimpleActivity(), FlingListener {
 
     // some devices ACTION_MOVE keeps triggering for the whole long press duration, but we are interested in real moves only, when coords change
     private fun hasFingerMoved(event: MotionEvent) = mTouchDownX != -1 && mTouchDownY != -1 &&
-        (Math.abs(mTouchDownX - event.x) > MAX_ALLOWED_MOVE_PX) || (Math.abs(mTouchDownY - event.y) > MAX_ALLOWED_MOVE_PX)
+        (Math.abs(mTouchDownX - event.x) > mMoveGestureThreshold) || (Math.abs(mTouchDownY - event.y) > mMoveGestureThreshold)
 
     private fun refetchLaunchers() {
         val launchers = getAllAppLaunchers()

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

@@ -20,5 +20,4 @@ const val ITEM_TYPE_WIDGET = 1
 const val ITEM_TYPE_SHORTCUT = 2
 
 const val WIDGET_HOST_ID = 12345
-const val MAX_ALLOWED_MOVE_PX = 10
 const val MAX_CLICK_DURATION = 150

app/src/main/kotlin/com/simplemobiletools/launcher/views/MyAppWidgetHostView.kt

@@ -6,14 +6,14 @@ import android.graphics.PointF
 import android.os.Handler
 import android.view.MotionEvent
 import android.view.ViewConfiguration
-import com.simplemobiletools.commons.extensions.performHapticFeedback
-import com.simplemobiletools.launcher.helpers.MAX_ALLOWED_MOVE_PX
+import com.simplemobiletools.launcher.R
 
 class MyAppWidgetHostView(context: Context) : AppWidgetHostView(context) {
     private var longPressHandler = Handler()
     private var actionDownCoords = PointF()
     private var currentCoords = PointF()
     private var actionDownMS = 0L
+    private val moveGestureThreshold = resources.getDimension(R.dimen.move_gesture_threshold).toInt()
     var hasLongPressed = false
     var ignoreTouches = false
     var longPressListener: ((x: Float, y: Float) -> Unit)? = null
@@ -60,7 +60,7 @@ class MyAppWidgetHostView(context: Context) : AppWidgetHostView(context) {
     }
 
     private val longPressRunnable = Runnable {
-        if (Math.abs(actionDownCoords.x - currentCoords.x) < MAX_ALLOWED_MOVE_PX && Math.abs(actionDownCoords.y - currentCoords.y) < MAX_ALLOWED_MOVE_PX) {
+        if (Math.abs(actionDownCoords.x - currentCoords.x) < moveGestureThreshold && Math.abs(actionDownCoords.y - currentCoords.y) < moveGestureThreshold) {
             longPressHandler.removeCallbacksAndMessages(null)
             hasLongPressed = true
             longPressListener?.invoke(actionDownCoords.x, actionDownCoords.y)

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

@@ -5,4 +5,5 @@
     <dimen name="widget_preview_size">140dp</dimen>
     <dimen name="icon_side_margin">10dp</dimen>
     <dimen name="resize_frame_dot_radius">8dp</dimen>
+    <dimen name="move_gesture_threshold">5dp</dimen>
 </resources>