优化

app/src/main/java/io/legado/app/data/entities/BookChapter.kt

@@ -36,19 +36,15 @@ data class BookChapter(
     var variable: String? = null        //变量
 ) : Parcelable {
 
-    @Ignore
+    @delegate:Transient
+    @delegate:Ignore
     @IgnoredOnParcel
-    var variableMap: HashMap<String, String>? = null
-        private set
-        get() {
-            if (field == null) {
-                field = GSON.fromJsonObject<HashMap<String, String>>(variable) ?: HashMap()
-            }
-            return field
+    val variableMap by lazy {
+        GSON.fromJsonObject<HashMap<String, String>>(variable) ?: HashMap()
     }
 
     fun putVariable(key: String, value: String) {
-        variableMap?.put(key, value)
+        variableMap[key] = value
         variable = GSON.toJson(variableMap)
     }