Optimize flip check

app/src/mobile/java/com/fongmi/android/tv/ui/custom/CustomKeyDown.java

@@ -18,8 +18,7 @@ import com.fongmi.android.tv.utils.Util;
 
 public class CustomKeyDown extends GestureDetector.SimpleOnGestureListener implements ScaleGestureDetector.OnScaleGestureListener {
 
-    private static final int DISTANCE = 250;
-    private static final int VELOCITY = 150;
+    private static final int DISTANCE = 100;
 
     private final ScaleGestureDetector scaleDetector;
     private final GestureDetector detector;
@@ -134,7 +133,7 @@ public class CustomKeyDown extends GestureDetector.SimpleOnGestureListener imple
     @Override
     public boolean onFling(MotionEvent e1, @NonNull MotionEvent e2, float velocityX, float velocityY) {
         if (isEdge(e1) || changeScale || !center || animating || e1.getPointerCount() > 1) return true;
-        checkFunc(e1, e2, velocityX, velocityY);
+        checkFunc(e1, e2);
         return true;
     }
 
@@ -152,11 +151,13 @@ public class CustomKeyDown extends GestureDetector.SimpleOnGestureListener imple
         touch = false;
     }
 
-    private void checkFunc(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
-        boolean isVertical = Math.abs(velocityX) < (Math.abs(velocityY) * 0.5);
-        if (isVertical && e1.getY() - e2.getY() > DISTANCE && Math.abs(velocityY) > VELOCITY) {
+    private void checkFunc(MotionEvent e1, MotionEvent e2) {
+        float dx = e2.getX() - e1.getX();
+        float dy = e2.getY() - e1.getY();
+        double angle = Math.toDegrees(Math.atan2(Math.abs(dy), Math.abs(dx)));
+        if (angle > 70 && e1.getY() - e2.getY() > DISTANCE) {
             videoView.animate().translationYBy(ResUtil.dp2px(Setting.isInvert() ? 24 : -24)).setDuration(150).withStartAction(() -> animating = true).withEndAction(() -> videoView.animate().translationY(0).setDuration(100).withStartAction(listener::onFlingUp).withEndAction(() -> animating = false).start()).start();
-        } else if (isVertical && e2.getY() - e1.getY() > DISTANCE && Math.abs(velocityY) > VELOCITY) {
+        } else if (angle > 70 && e2.getY() - e1.getY() > DISTANCE) {
             videoView.animate().translationYBy(ResUtil.dp2px(Setting.isInvert() ? -24 : 24)).setDuration(150).withStartAction(() -> animating = true).withEndAction(() -> videoView.animate().translationY(0).setDuration(100).withStartAction(listener::onFlingDown).withEndAction(() -> animating = false).start()).start();
         }
     }