防止内存泄漏

modules/mogo-module-v2x/src/main/java/com/mogo/module/v2x/fragment/V2XEventPanelFragment.kt

@@ -53,9 +53,16 @@ class V2XEventPanelFragment : MvpFragment<V2XEventPanelFragment, EventPanelPrese
     private val mV2XShareEventsFragment = V2XShareEventsFragment()
 
     companion object {
-        private val fragment = V2XEventPanelFragment()
+        private var fragment: V2XEventPanelFragment? = null
         fun getInstance(): V2XEventPanelFragment {
-            return fragment
+            if (fragment == null) {
+                synchronized(this) {
+                    if (fragment == null) {
+                        fragment = V2XEventPanelFragment()
+                    }
+                }
+            }
+            return fragment as V2XEventPanelFragment
         }
     }