android P Launcher3 横屏状态长按图标 弹框位置居中

修改参考：android 8.1 Launcher3 横屏状态长按图标 弹框位置居中分析

--- a/vendor/mediatek/proprietary/packages/apps/Launcher3/src/com/android/launcher3/popup/ArrowPopup.java
+++ b/vendor/mediatek/proprietary/packages/apps/Launcher3/src/com/android/launcher3/popup/ArrowPopup.java
@@ -257,6 +257,15 @@ public abstract class ArrowPopup extends AbstractFloatingView {
         }
         x += mIsLeftAligned ? xOffset : -xOffset;
 
+        int shortcutItemWidth =    
+            resources.getDimensionPixelSize(R.dimen.bg_popup_item_width);
+        if( x +  shortcutItemWidth > dragLayer.getWidth()){
+            mIsLeftAligned = false;
+            x = x - shortcutItemWidth + xOffset;
+        }
+
         // Open above icon if there is room.
         int iconHeight = mTempRect.height();
         int y = mTempRect.top - height;