diff --git a/src/main/java/com/reandroid/lib/apk/ResourceIds.java b/src/main/java/com/reandroid/lib/apk/ResourceIds.java
index 08a63ee..b39e6d0 100644
--- a/src/main/java/com/reandroid/lib/apk/ResourceIds.java
+++ b/src/main/java/com/reandroid/lib/apk/ResourceIds.java
@@ -19,6 +19,7 @@ import com.reandroid.lib.arsc.chunk.PackageBlock;
 import com.reandroid.lib.arsc.chunk.TableBlock;
 import com.reandroid.lib.arsc.group.EntryGroup;
 import com.reandroid.lib.arsc.pool.SpecStringPool;
+import com.reandroid.lib.arsc.util.ResNameMap;
 import com.reandroid.lib.json.JSONArray;
 import com.reandroid.lib.json.JSONObject;
 import com.reandroid.xml.*;
@@ -244,9 +245,23 @@ import java.util.*;
             public final byte id;
             public String name;
             public final Map<Byte, Type> typeMap;
+            private final ResNameMap<Integer> mEntryNameMap;
             public Package(byte id){
                 this.id = id;
                 this.typeMap = new HashMap<>();
+                this.mEntryNameMap = new ResNameMap<>();
+            }
+            public void loadEntryMap(){
+                mEntryNameMap.clear();
+                for(Type type:typeMap.values()){
+                    String typeName=type.getName();
+                    for(Type.Entry entry: type.entryMap.values()){
+                        mEntryNameMap.add(typeName, entry.getName(), entry.getResourceId());
+                    }
+                }
+            }
+            public Integer getResourceId(String typeName, String name){
+                return mEntryNameMap.get(typeName, name);
             }
             public Type.Entry getEntry(String typeName, String name){
                 Type type=getType(typeName);
diff --git a/src/main/java/com/reandroid/lib/apk/xmlencoder/EncodeMaterials.java b/src/main/java/com/reandroid/lib/apk/xmlencoder/EncodeMaterials.java
index 2f3eb86..4f17dff 100644
--- a/src/main/java/com/reandroid/lib/apk/xmlencoder/EncodeMaterials.java
+++ b/src/main/java/com/reandroid/lib/apk/xmlencoder/EncodeMaterials.java
@@ -25,6 +25,7 @@
  import com.reandroid.lib.arsc.group.EntryGroup;
  import com.reandroid.lib.arsc.item.SpecString;
  import com.reandroid.lib.arsc.util.FrameworkTable;
+ import com.reandroid.lib.arsc.util.ResNameMap;
  import com.reandroid.lib.arsc.value.EntryBlock;
  import com.reandroid.lib.common.Frameworks;
  import com.reandroid.lib.common.ResourceResolver;
@@ -41,6 +42,7 @@
      private APKLogger apkLogger;
      private boolean mForceCreateNamespaces = true;
      private Set<String> mFrameworkPackageNames;
+     private final ResNameMap<EntryBlock> mLocalResNameMap = new ResNameMap<>();
      public EncodeMaterials(){
      }
      public SpecString getSpecString(String name){
@@ -48,29 +50,6 @@
                  .get(name)
                  .get(0);
      }
-     public void addTableStringPool(Collection<String> stringList){
-         getCurrentPackage()
-                 .getTableBlock()
-                 .getTableStringPool()
-                 .addStrings(stringList);
-     }
-     public int resolveAttributeNameReference(String refString){
-         String packageName = null;
-         String type = "attr";
-         String name = refString;
-         int i=refString.lastIndexOf(':');
-         if(i>=0){
-             packageName=refString.substring(0, i);
-             name=refString.substring(i+1);
-         }
-         if(EncodeUtil.isEmpty(packageName)
-                 || packageName.equals(getCurrentPackageName())
-                 || !isFrameworkPackageName(packageName)){
-
-             return resolveLocalResourceId(type, name);
-         }
-         return resolveFrameworkResourceId(packageName, type, name);
-     }
      public EntryBlock getAttributeBlock(String refString){
          String packageName = null;
          String type = "attr";
@@ -111,34 +90,11 @@
          }
          return resolveFrameworkResourceId(packageName, type, name);
      }
-
-     public EntryBlock resolveEntryReference(String refString){
-         if("@null".equals(refString)){
-             return null;
-         }
-         Matcher matcher = ValueDecoder.PATTERN_REFERENCE.matcher(refString);
-         if(!matcher.find()){
-             return null;
-         }
-         String prefix=matcher.group(1);
-         String packageName = matcher.group(2);
-         if(packageName!=null && packageName.endsWith(":")){
-             packageName=packageName.substring(0, packageName.length()-1);
-         }
-         String type = matcher.group(4);
-         String name = matcher.group(5);
-         if(EncodeUtil.isEmpty(packageName)
-                 || packageName.equals(getCurrentPackageName())
-                 || !isFrameworkPackageName(packageName)){
-             return getLocalEntryBlock(type, name);
-         }
-         return getFrameworkEntry(packageName, type, name);
-     }
      public int resolveLocalResourceId(String type, String name){
          for(ResourceIds.Table.Package pkg:packageIdSet){
-             ResourceIds.Table.Package.Type.Entry entry = pkg.getEntry(type, name);
-             if(entry!=null){
-                 return entry.getResourceId();
+             Integer resId = pkg.getResourceId(type, name);
+             if(resId!=null){
+                 return resId;
              }
          }
          EntryGroup entryGroup=getLocalEntryGroup(type, name);
@@ -149,15 +105,6 @@
                  "type="+type+
                  ", name="+name);
      }
-     public int resolveFrameworkResourceId(String type, String name){
-         EntryBlock entryBlock = getFrameworkEntry(type, name);
-         if(entryBlock!=null){
-             return entryBlock.getResourceId();
-         }
-         throw new EncodeException("Framework entry not found: " +
-                 "type="+type+
-                 ", name="+name);
-     }
      public int resolveFrameworkResourceId(String packageName, String type, String name){
          EntryBlock entryBlock = getFrameworkEntry(packageName, type, name);
          if(entryBlock!=null){
@@ -196,6 +143,22 @@
          return null;
      }
      public EntryBlock getLocalEntryBlock(String type, String name){
+         EntryBlock entryBlock=mLocalResNameMap.get(type, name);
+         if(entryBlock!=null){
+             return entryBlock;
+         }
+         loadLocalEntryBlockMap(type);
+         entryBlock=mLocalResNameMap.get(type, name);
+         if(entryBlock!=null){
+             return entryBlock;
+         }
+         entryBlock= searchLocalEntryBlock(type, name);
+         if(entryBlock!=null){
+             mLocalResNameMap.add(type, name, entryBlock);
+         }
+         return entryBlock;
+     }
+     private EntryBlock searchLocalEntryBlock(String type, String name){
          for(EntryGroup entryGroup : currentPackage.listEntryGroup()){
              if(type.equals(entryGroup.getTypeName()) &&
                      name.equals(entryGroup.getSpecName())){
@@ -205,7 +168,7 @@
          SpecTypePair specTypePair=currentPackage.searchByTypeName(type);
          if(specTypePair!=null){
              for(TypeBlock typeBlock:specTypePair.listTypeBlocks()){
-                 for(EntryBlock entryBlock:typeBlock.listEntries()){
+                 for(EntryBlock entryBlock:typeBlock.listEntries(true)){
                      if(name.equals(entryBlock.getName())){
                          return entryBlock;
                      }
@@ -220,7 +183,7 @@
              specTypePair=packageBlock.searchByTypeName(type);
              if(specTypePair!=null){
                  for(TypeBlock typeBlock:specTypePair.listTypeBlocks()){
-                     for(EntryBlock entryBlock:typeBlock.listEntries()){
+                     for(EntryBlock entryBlock:typeBlock.listEntries(true)){
                          if(name.equals(entryBlock.getName())){
                              return entryBlock;
                          }
@@ -231,6 +194,20 @@
          }
          return null;
      }
+     private void loadLocalEntryBlockMap(String type){
+         ResNameMap<EntryBlock> localMap = mLocalResNameMap;
+         for(PackageBlock packageBlock:currentPackage.getTableBlock().listPackages()){
+             SpecTypePair specTypePair=packageBlock.searchByTypeName(type);
+             if(specTypePair!=null){
+                 for(TypeBlock typeBlock:specTypePair.listTypeBlocks()){
+                     for(EntryBlock entryBlock:typeBlock.listEntries(true)){
+                         localMap.add(entryBlock.getTypeName(),
+                                 entryBlock.getName(), entryBlock);
+                     }
+                 }
+             }
+         }
+     }
      public EntryBlock getFrameworkEntry(String type, String name){
          for(FrameworkTable table:frameworkTables){
              EntryBlock entryBlock = table.searchEntryBlock(type, name);
@@ -282,16 +259,12 @@
          }
          return null;
      }
-
      public EncodeMaterials setForceCreateNamespaces(boolean force) {
          this.mForceCreateNamespaces = force;
          return this;
      }
-     public EncodeMaterials addPackageIds(Collection<ResourceIds.Table.Package> packageIdList) {
-         this.packageIdSet.addAll(packageIdList);
-         return this;
-     }
      public EncodeMaterials addPackageIds(ResourceIds.Table.Package packageIds) {
+         packageIds.loadEntryMap();
          this.packageIdSet.add(packageIds);
          return this;
      }
diff --git a/src/main/java/com/reandroid/lib/apk/xmlencoder/XMLFileEncoder.java b/src/main/java/com/reandroid/lib/apk/xmlencoder/XMLFileEncoder.java
index bbf38aa..f1f557a 100644
--- a/src/main/java/com/reandroid/lib/apk/xmlencoder/XMLFileEncoder.java
+++ b/src/main/java/com/reandroid/lib/apk/xmlencoder/XMLFileEncoder.java
@@ -99,16 +99,23 @@ public class XMLFileEncoder {
         int count=element.getAttributeCount();
         for(int i=0;i<count;i++){
             XMLAttribute attribute=element.getAttributeAt(i);
+            if(attribute instanceof SchemaAttr){
+                continue;
+            }
             if(SchemaAttr.looksSchema(attribute.getName(), attribute.getValue())){
                 continue;
             }
-            EntryBlock entryBlock=materials.getAttributeBlock(attribute.getName());
-            int resourceId=0;
-            if(entryBlock!=null){
-                resourceId=entryBlock.getResourceId();
+            String name=attribute.getNameWoPrefix();
+            int resourceId=decodeUnknownAttributeHex(name);
+            EntryBlock entryBlock=null;
+            if(resourceId==0){
+                entryBlock=getAttributeBlock(attribute);
+                if(entryBlock!=null){
+                    resourceId=entryBlock.getResourceId();
+                }
             }
             ResXmlAttribute xmlAttribute =
-                    resXmlElement.createAttribute(attribute.getNameWoPrefix(), resourceId);
+                    resXmlElement.createAttribute(name, resourceId);
             String prefix=attribute.getNamePrefix();
             if(prefix!=null){
                 ResXmlStartNamespace ns = resXmlElement.getStartNamespaceByPrefix(prefix);
@@ -198,11 +205,37 @@ public class XMLFileEncoder {
         }
     }
     private void addResourceId(ResIdBuilder idBuilder, XMLAttribute attribute){
-        EntryBlock entryBlock = materials.getAttributeBlock(attribute.getName());
+        String name=attribute.getNameWoPrefix();
+        int id=decodeUnknownAttributeHex(name);
+        if(id!=0){
+            idBuilder.add(id, name);
+            return;
+        }
+        EntryBlock entryBlock = getAttributeBlock(attribute);
         if(entryBlock!=null){
             idBuilder.add(entryBlock.getResourceId(), entryBlock.getName());
         }
     }
+    private int decodeUnknownAttributeHex(String name){
+        if(name.length()==0||name.charAt(0)!='@'){
+            return 0;
+        }
+        name=name.substring(1);
+        if(!ValueDecoder.isHex(name)){
+            return 0;
+        }
+        return ValueDecoder.parseHex(name);
+    }
+    private EntryBlock getAttributeBlock(XMLAttribute attribute){
+        if(attribute instanceof SchemaAttr){
+            return null;
+        }
+        String name=attribute.getName();
+        if(name.indexOf(':')<0){
+            return null;
+        }
+        return materials.getAttributeBlock(name);
+    }
     private ResXmlStartNamespace forceCreateNamespace(ResXmlElement resXmlElement,
                                                       int resourceId, String prefix){
         if(!materials.isForceCreateNamespaces()){
diff --git a/src/main/java/com/reandroid/lib/arsc/util/FrameworkTable.java b/src/main/java/com/reandroid/lib/arsc/util/FrameworkTable.java
index cc8566b..4cf6833 100755
--- a/src/main/java/com/reandroid/lib/arsc/util/FrameworkTable.java
+++ b/src/main/java/com/reandroid/lib/arsc/util/FrameworkTable.java
@@ -39,8 +39,7 @@ public class FrameworkTable extends TableBlock {
     private String mFrameworkTitle;
     private String mFrameworkName;
     private String mFrameworkVersion;
-    private Map<String, Map<String, EntryGroup>> mNameGroupMap;
-    private final Object mMapLock=new Object();
+    private ResNameMap<EntryGroup> mNameGroupMap;
     public FrameworkTable(){
         super();
     }
@@ -57,55 +56,40 @@ public class FrameworkTable extends TableBlock {
      * Call this if you plan to search entries frequently
      */
     public void loadResourceNameMap(){
-        synchronized (mMapLock){
-            if(mNameGroupMap !=null){
-                return;
-            }
-            Map<String, Map<String, EntryGroup>> typeMap=new HashMap<>();
+        ResNameMap<EntryGroup> resNameMap = mNameGroupMap;
+        if(resNameMap == null){
+            resNameMap = new ResNameMap<>();
             for(PackageBlock packageBlock:listPackages()){
                 for(EntryGroup group:packageBlock.listEntryGroup()){
-                    String type=group.getTypeName();
-                    Map<String, EntryGroup> groupMap=typeMap.get(type);
-                    if(groupMap==null){
-                        groupMap=new HashMap<>();
-                        typeMap.put(type, groupMap);
-                    }
-                    groupMap.put(group.getSpecName(), group);
+                    resNameMap.add(group.getTypeName(),
+                            group.getSpecName(),
+                            group);
                 }
             }
-            mNameGroupMap = typeMap;
+            mNameGroupMap = resNameMap;
         }
     }
     /**
      * Clears resource name map from memory
      */
     public void clearResourceNameMap(){
-        synchronized (mMapLock){
-            if(mNameGroupMap!=null){
-                mNameGroupMap.clear();
-                mNameGroupMap =null;
-            }
+        if(mNameGroupMap!=null){
+            mNameGroupMap.clear();
+            mNameGroupMap =null;
         }
     }
     private boolean hasResourceGroupMap(){
-        synchronized (mMapLock){
-            return mNameGroupMap!=null;
-        }
+        return mNameGroupMap!=null;
     }
     private EntryBlock searchEntryBlockFromMap(String typeName, String entryName){
-        synchronized (mMapLock){
-            if(mNameGroupMap ==null){
-                return null;
-            }
-            Map<String, EntryGroup> groupMap = mNameGroupMap.get(typeName);
-            if(groupMap!=null){
-                EntryGroup group=groupMap.get(entryName);
-                if(group!=null){
-                    return group.pickOne();
-                }
-            }
+        if(mNameGroupMap ==null){
             return null;
         }
+        EntryGroup entryGroup = mNameGroupMap.get(typeName, entryName);
+        if(entryGroup!=null){
+            return entryGroup.pickOne();
+        }
+        return null;
     }
     public EntryBlock searchEntryBlock(String typeName, String entryName){
         if(hasResourceGroupMap()){
diff --git a/src/main/java/com/reandroid/lib/arsc/util/HexBytesWriter.java b/src/main/java/com/reandroid/lib/arsc/util/HexBytesWriter.java
index 3b713bb..2511d46 100644
--- a/src/main/java/com/reandroid/lib/arsc/util/HexBytesWriter.java
+++ b/src/main/java/com/reandroid/lib/arsc/util/HexBytesWriter.java
@@ -1,3 +1,18 @@
+ /*
+  *  Copyright (C) 2022 github.com/REAndroid
+  *
+  *  Licensed under the Apache License, Version 2.0 (the "License");
+  *  you may not use this file except in compliance with the License.
+  *  You may obtain a copy of the License at
+  *
+  *      http://www.apache.org/licenses/LICENSE-2.0
+  *
+  * Unless required by applicable law or agreed to in writing, software
+  * distributed under the License is distributed on an "AS IS" BASIS,
+  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  * See the License for the specific language governing permissions and
+  * limitations under the License.
+  */
 package com.reandroid.lib.arsc.util;
 
 import java.io.IOException;
diff --git a/src/main/java/com/reandroid/lib/arsc/util/ResNameMap.java b/src/main/java/com/reandroid/lib/arsc/util/ResNameMap.java
new file mode 100644
index 0000000..33378ab
--- /dev/null
+++ b/src/main/java/com/reandroid/lib/arsc/util/ResNameMap.java
@@ -0,0 +1,65 @@
+ /*
+  *  Copyright (C) 2022 github.com/REAndroid
+  *
+  *  Licensed under the Apache License, Version 2.0 (the "License");
+  *  you may not use this file except in compliance with the License.
+  *  You may obtain a copy of the License at
+  *
+  *      http://www.apache.org/licenses/LICENSE-2.0
+  *
+  * Unless required by applicable law or agreed to in writing, software
+  * distributed under the License is distributed on an "AS IS" BASIS,
+  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  * See the License for the specific language governing permissions and
+  * limitations under the License.
+  */
+package com.reandroid.lib.arsc.util;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class ResNameMap<VALUE> {
+    private final Object mLock = new Object();
+    private final Map<String, Map<String, VALUE>> mainMap;
+    public ResNameMap(){
+        this.mainMap = new HashMap<>();
+    }
+
+    public VALUE get(String type, String name){
+        synchronized (mLock){
+            if(type==null || name==null){
+                return null;
+            }
+            Map<String, VALUE> valueMap = mainMap.get(type);
+            if(valueMap!=null){
+                return valueMap.get(name);
+            }
+            return null;
+        }
+    }
+    public void add(String type, String name, VALUE value){
+        synchronized (mLock){
+            if(type==null || name==null || value==null){
+                return;
+            }
+            Map<String, VALUE> valueMap = mainMap.get(type);
+            if(valueMap==null){
+                valueMap=new HashMap<>();
+                mainMap.put(type, valueMap);
+            }
+            valueMap.put(name, value);
+        }
+    }
+    public void clear(){
+        synchronized (mLock){
+            for(Map<String, VALUE> valueMap:mainMap.values()){
+                valueMap.clear();
+            }
+            mainMap.clear();
+        }
+    }
+
+    private static final String TYPE_ATTR = "attr";
+    private static final String TYPE_ID = "id";
+
+}