Merge pull request #8 in PF/design from ~RINOUX/design:dev to dev

* commit '6ff9c2c521c0d8a862911839c931b8ac4f8c691d':
  修复错误

designer_base/src/com/fr/design/fun/impl/AbstractDesignerStartOpenFileProcessor.java

@@ -3,13 +3,11 @@ package com.fr.design.fun.impl;
 import com.fr.design.fun.DesignerStartOpenFileProcessor;
 import com.fr.stable.fun.mark.API;
 
-import static com.fr.stable.fun.mark.Layer.DEFAULT_LAYER_INDEX;
-
 /**
  * Created by rinoux on 2016/12/16.
  */
 @API(level = DesignerStartOpenFileProcessor.CURRENT_LEVEL)
-public class AbstractDesignerStartOpenFileProcessor {
+public abstract class AbstractDesignerStartOpenFileProcessor implements DesignerStartOpenFileProcessor {
     public int currentAPILevel() {
         return DesignerStartOpenFileProcessor.CURRENT_LEVEL;
     }