diff --git a/android/jni/DownloadTask.c b/android/jni/DownloadTask.c
index d41793c..562714f 100644
--- a/android/jni/DownloadTask.c
+++ b/android/jni/DownloadTask.c
@@ -131,7 +131,7 @@ JNIEXPORT jbyteArray JNICALL Java_cn_reactnative_modules_update_DownloadTask_hdi
     hpatch_singleCompressedDiffInfo patInfo;
 
     _check(((originLength==0)||originPtr) && patchPtr && (patchLength>0),"Corrupt patch");
-    _check(kHPatch_ok!=hpatch_getInfo_by_mem(&patInfo,(const uint8_t*)patchPtr,patchLength),"Error info in hpatch");
+    _check(kHPatch_ok==hpatch_getInfo_by_mem(&patInfo,(const uint8_t*)patchPtr,patchLength),"Error info in hpatch");
     _check(originLength==patInfo.oldDataSize,"Error oldDataSize in hpatch");
     newsize=(size_t)patInfo.newDataSize;
     if (sizeof(size_t)!=sizeof(hpatch_StreamPos_t))
@@ -144,7 +144,7 @@ JNIEXPORT jbyteArray JNICALL Java_cn_reactnative_modules_update_DownloadTask_hdi
         _check(outPtr,"Corrupt JNIEnv::GetByteArrayElements");
     }
 
-    _check(kHPatch_ok!=hpatch_by_mem((const uint8_t*)originPtr,originLength,(uint8_t*)outPtr,newsize,
+    _check(kHPatch_ok==hpatch_by_mem((const uint8_t*)originPtr,originLength,(uint8_t*)outPtr,newsize,
                                      (const uint8_t*)patchPtr,patchLength,&patInfo),"hpacth");
 
 _clear:
diff --git a/android/jni/hpatch.h b/android/jni/hpatch.h
index 3046d02..516df4a 100644
--- a/android/jni/hpatch.h
+++ b/android/jni/hpatch.h
@@ -1,5 +1,5 @@
 // hpatch.h 
-// import HDiffPatch, support patchfile created by "hdiffz -SD -C-lzma2 oldfile newfile patchfile" 
+// import HDiffPatch, support patchData created by "hdiffz -SD -c-lzma2 oldfile newfile patchfile" 
 // Copyright 2021 housisong, All rights reserved
 
 #ifndef HDIFFPATCH_PATCH_H
diff --git a/android/src/main/java/cn/reactnative/modules/update/DownloadTask.java b/android/src/main/java/cn/reactnative/modules/update/DownloadTask.java
index 5ee4225..2f463fa 100644
--- a/android/src/main/java/cn/reactnative/modules/update/DownloadTask.java
+++ b/android/src/main/java/cn/reactnative/modules/update/DownloadTask.java
@@ -498,11 +498,11 @@ class DownloadTask extends AsyncTask<DownloadTaskParams, long[], Void> {
                     break;
                 case DownloadTaskParams.TASK_TYPE_PATCH_FROM_APK:
                 case DownloadTaskParams.TASK_TYPE_HPATCH_FROM_APK:
-                    doPatchFromApk(params[0],type);
+                    doPatchFromApk(params[0],taskType);
                     break;
                 case DownloadTaskParams.TASK_TYPE_PATCH_FROM_PPK:
                 case DownloadTaskParams.TASK_TYPE_HPATCH_FROM_PPK:
-                    doPatchFromPpk(params[0],type);
+                    doPatchFromPpk(params[0],taskType);
                     break;
                 case DownloadTaskParams.TASK_TYPE_CLEANUP:
                     doCleanUp(params[0]);
diff --git a/android/src/main/java/cn/reactnative/modules/update/DownloadTaskParams.java b/android/src/main/java/cn/reactnative/modules/update/DownloadTaskParams.java
index fbddeb3..7d7c538 100644
--- a/android/src/main/java/cn/reactnative/modules/update/DownloadTaskParams.java
+++ b/android/src/main/java/cn/reactnative/modules/update/DownloadTaskParams.java
@@ -8,15 +8,15 @@ import java.io.File;
  * Created by tdzl2003 on 3/31/16.
  */
 class DownloadTaskParams {
-    static final int TASK_TYPE_CLEANUP        = 0; //Keep hash & originHash
+    static final int TASK_TYPE_CLEANUP          = 0; //Keep hash & originHash
 
-    static final int TASK_TYPE_PATCH_FULL     = 1;
-    static final int TASK_TYPE_PATCH_FROM_APK = 2;
-    static final int TASK_TYPE_PATCH_FROM_PPK = 3;
-    static final int TASK_TYPE_PLAIN_DOWNLOAD = 4;
+    static final int TASK_TYPE_PATCH_FULL       = 1;
+    static final int TASK_TYPE_PATCH_FROM_APK   = 2;
+    static final int TASK_TYPE_PATCH_FROM_PPK   = 3;
+    static final int TASK_TYPE_PLAIN_DOWNLOAD   = 4;
 
-    static final int TASK_TYPE_HPATCH_FROM_APK = 5;
-    static final int TASK_TYPE_HPATCH_FROM_PPK = 6;
+    static final int TASK_TYPE_HPATCH_FROM_APK  = 5;
+    static final int TASK_TYPE_HPATCH_FROM_PPK  = 6;
 
     static boolean isHPatchType(int patchType){
         return (patchType==TASK_TYPE_HPATCH_FROM_APK)||(patchType==TASK_TYPE_HPATCH_FROM_PPK);
diff --git a/android/src/main/java/cn/reactnative/modules/update/UpdateContext.java b/android/src/main/java/cn/reactnative/modules/update/UpdateContext.java
index 0b294f6..ae911cd 100644
--- a/android/src/main/java/cn/reactnative/modules/update/UpdateContext.java
+++ b/android/src/main/java/cn/reactnative/modules/update/UpdateContext.java
@@ -92,15 +92,15 @@ public class UpdateContext {
 
     private String zipExtension(int patchType){
         switch (patchType) {
-            case TASK_TYPE_PATCH_FULL:
+            case DownloadTaskParams.TASK_TYPE_PATCH_FULL:
                 return ".ppk";
-            case TASK_TYPE_PATCH_FROM_APK:
+            case DownloadTaskParams.TASK_TYPE_PATCH_FROM_APK:
                 return ".apk.patch";
-            case TASK_TYPE_PATCH_FROM_PPK:
+            case DownloadTaskParams.TASK_TYPE_PATCH_FROM_PPK:
                 return ".ppk.patch";
-            case TASK_TYPE_HPATCH_FROM_APK:
+            case DownloadTaskParams.TASK_TYPE_HPATCH_FROM_APK:
                 return ".apk.hpatch";
-            case TASK_TYPE_HPATCH_FROM_PPK:
+            case DownloadTaskParams.TASK_TYPE_HPATCH_FROM_PPK:
                 return ".ppk.hpatch";
             default:
                 return "";//unknown type