diff --git a/epublib/src/main/java/me/ag2s/epublib/domain/FileResourceProvider.java b/epublib/src/main/java/me/ag2s/epublib/domain/FileResourceProvider.java
index a9db2b5d9..e273712d6 100644
--- a/epublib/src/main/java/me/ag2s/epublib/domain/FileResourceProvider.java
+++ b/epublib/src/main/java/me/ag2s/epublib/domain/FileResourceProvider.java
@@ -16,21 +16,27 @@ public class FileResourceProvider implements LazyResourceProvider {
 
     /**
      * 创建一个文件夹里面文件夹的LazyResourceProvider，用于LazyResource。
-     * @param dir 文件的目录
+     * @param parentDir 文件的目录
      */
-    public FileResourceProvider(String dir) {
-        this.dir = dir;
+    public FileResourceProvider(String parentDir) {
+        this.dir = parentDir;
     }
 
     /**
      * 创建一个文件夹里面文件夹的LazyResourceProvider，用于LazyResource。
-     * @param dirfile 文件夹
+     * @param parentFile 文件夹
      */
     @SuppressWarnings("unused")
-    public FileResourceProvider(File dirfile) {
-        this.dir = dirfile.getPath();
+    public FileResourceProvider(File parentFile) {
+        this.dir = parentFile.getPath();
     }
 
+    /**
+     * 根据子文件名href,再父目录下读取文件获取FileInputStream
+     * @param href 子文件名href
+     * @return 对应href的FileInputStream
+     * @throws IOException 抛出IOException
+     */
     @Override
     public InputStream getResourceStream(String href) throws IOException {
         return new FileInputStream(new File(dir, href));
diff --git a/epublib/src/main/java/me/ag2s/epublib/domain/TitledResourceReference.java b/epublib/src/main/java/me/ag2s/epublib/domain/TitledResourceReference.java
index 076b9952b..6357bc489 100644
--- a/epublib/src/main/java/me/ag2s/epublib/domain/TitledResourceReference.java
+++ b/epublib/src/main/java/me/ag2s/epublib/domain/TitledResourceReference.java
@@ -1,5 +1,7 @@
 package me.ag2s.epublib.domain;
 
+import android.util.Log;
+
 import me.ag2s.epublib.Constants;
 import me.ag2s.epublib.util.StringUtil;
 
@@ -72,6 +74,8 @@ public class TitledResourceReference extends ResourceReference
         //resource为null时不设置标题
         if(this.resource!=null&&this.title!=null){
             resource.setTitle(title);
+        }else {
+            Log.e(TitledResourceReference.class.getSimpleName(),"警告：resource 为null,忽略设置标题。");
         }
 
         return resource;