diff --git a/Aria/src/main/java/com/arialyy/aria/core/ConfigHelper.java b/Aria/src/main/java/com/arialyy/aria/core/ConfigHelper.java
index d6cb98ec..f9113622 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/ConfigHelper.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/ConfigHelper.java
@@ -59,9 +59,6 @@ class ConfigHelper extends DefaultHandler {
 
       String value = attributes.getValue("value");
       switch (qName) {
-        case "openDynamicFile":
-          loadOpenDynamicFile(value);
-          break;
         case "threadNum":
           loadThreadNum(value);
           break;
@@ -117,12 +114,6 @@ class ConfigHelper extends DefaultHandler {
     }
   }
 
-  private void loadOpenDynamicFile(String value) {
-    if (isDownloadConfig) {
-      mDownloadConfig.openDynamicFile = checkBoolean(value) ? Boolean.valueOf(value) : false;
-    }
-  }
-
   private void loadNotNetRetry(String value) {
     if (isDownloadConfig) {
       mDownloadConfig.notNetRetry = checkBoolean(value) ? Boolean.valueOf(value) : false;
diff --git a/Aria/src/main/java/com/arialyy/aria/core/common/AbsFileer.java b/Aria/src/main/java/com/arialyy/aria/core/common/AbsFileer.java
index bef04a0c..a8af4f7d 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/common/AbsFileer.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/common/AbsFileer.java
@@ -44,8 +44,11 @@ import java.util.concurrent.Executors;
  */
 public abstract class AbsFileer<ENTITY extends AbsNormalEntity, TASK_ENTITY extends AbsTaskEntity<ENTITY>>
     implements Runnable, IUtil {
-  public static final String STATE = "_state_";
-  public static final String RECORD = "_record_";
+  private static final String STATE = "_state_";
+  private static final String RECORD = "_record_";
+  /**
+   * 小于1m的文件不启用多线程
+   */
   protected static final long SUB_LEN = 1024 * 1024;
 
   private final String TAG = "AbsFileer";
@@ -57,16 +60,14 @@ public abstract class AbsFileer<ENTITY extends AbsNormalEntity, TASK_ENTITY exte
   protected StateConstance mConstance;
   private ExecutorService mFixedThreadPool;
   //总线程数
-  private int mTotalThreadNum;
+  protected int mTotalThreadNum;
   //启动线程数
   private int mStartThreadNum;
   //已完成的线程数
   private int mCompleteThreadNum;
   private SparseArray<AbsThreadTask> mTask = new SparseArray<>();
 
-  /**
-   * 小于1m的文件不启用多线程
-   */
+
   private Timer mTimer;
   @Deprecated
   private File mConfigFile;
@@ -74,7 +75,7 @@ public abstract class AbsFileer<ENTITY extends AbsNormalEntity, TASK_ENTITY exte
    * 进度刷新间隔
    */
   private long mUpdateInterval = 1000;
-  protected TaskRecord mRecord;
+  private TaskRecord mRecord;
 
   protected AbsFileer(IEventListener listener, TASK_ENTITY taskEntity) {
     mListener = listener;
@@ -124,6 +125,16 @@ public abstract class AbsFileer<ENTITY extends AbsNormalEntity, TASK_ENTITY exte
       handleBreakpoint();
     }
     mConstance.START_THREAD_NUM = mTotalThreadNum;
+    /*
+     * mTaskEntity.getEntity().getFileSize() != mTempFile.length()为兼容以前老版本代码
+     * 动态长度条件：
+     * 1、总线程数为1，并且是新任务
+     * 2、总线程数为1，不是新任务，但是长度不是文件全长度
+     */
+    if (mTotalThreadNum == 1 && (mTaskEntity.isNewTask()
+        || mTaskEntity.getEntity().getFileSize() != mTempFile.length())) {
+      mConstance.isOpenDynamicFile = true;
+    }
     startTimer();
   }
 
@@ -237,7 +248,7 @@ public abstract class AbsFileer<ENTITY extends AbsNormalEntity, TASK_ENTITY exte
    * 3、数据库记录不存在
    * 4、不支持断点，则是新任务
    */
-  protected void checkTask() {
+  private void checkTask() {
     mConfigFile = new File(CommonUtil.getFileConfigPath(false, mEntity.getFileName()));
     if (mConfigFile.exists()) {
       convertDb();
@@ -334,8 +345,6 @@ public abstract class AbsFileer<ENTITY extends AbsNormalEntity, TASK_ENTITY exte
     mRecord.filePath = mTaskEntity.getKey();
     mRecord.threadRecords = new ArrayList<>();
     mRecord.isGroupRecord = mTaskEntity.getEntity().isGroupChild();
-    mRecord.isOpenDynamicFile =
-        AriaManager.getInstance(AriaManager.APP).getDownloadConfig().isOpenDynamicFile();
     if (mRecord.isGroupRecord) {
       if (mTaskEntity.getEntity() instanceof DownloadEntity) {
         mRecord.dGroupName = ((DownloadEntity) mTaskEntity.getEntity()).getGroupName();
diff --git a/Aria/src/main/java/com/arialyy/aria/core/common/StateConstance.java b/Aria/src/main/java/com/arialyy/aria/core/common/StateConstance.java
index 25db8ea6..8aca4910 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/common/StateConstance.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/common/StateConstance.java
@@ -30,6 +30,11 @@ public class StateConstance {
   public boolean isCancel = false;
   public boolean isStop = false;
   public TaskRecord TASK_RECORD;
+  /**
+   * 是否是使用虚拟文件下载的
+   * {@code true}是，{@code false}不是
+   */
+  public boolean isOpenDynamicFile = false;
 
   public StateConstance() {
   }
diff --git a/Aria/src/main/java/com/arialyy/aria/core/common/TaskRecord.java b/Aria/src/main/java/com/arialyy/aria/core/common/TaskRecord.java
index cc0cc3fd..ea928de3 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/common/TaskRecord.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/common/TaskRecord.java
@@ -73,10 +73,4 @@ public class TaskRecord extends DbEntity {
   @Ignore
   @Deprecated
   public String uGroupName;
-
-  /**
-   * 是否是使用虚拟文件下载的
-   * {@code true}是，{@code false}不是
-   */
-  public boolean isOpenDynamicFile = false;
 }
diff --git a/Aria/src/main/java/com/arialyy/aria/core/download/BaseDListener.java b/Aria/src/main/java/com/arialyy/aria/core/download/BaseDListener.java
index 3e1be934..56216403 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/download/BaseDListener.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/download/BaseDListener.java
@@ -19,8 +19,6 @@ import android.os.Handler;
 import com.arialyy.aria.core.AriaManager;
 import com.arialyy.aria.core.common.TaskRecord;
 import com.arialyy.aria.core.inf.AbsEntity;
-import com.arialyy.aria.core.inf.AbsGroupEntity;
-import com.arialyy.aria.core.inf.AbsNormalEntity;
 import com.arialyy.aria.core.inf.AbsTask;
 import com.arialyy.aria.core.inf.AbsTaskEntity;
 import com.arialyy.aria.core.inf.IDownloadListener;
@@ -158,14 +156,16 @@ class BaseDListener<ENTITY extends AbsEntity, TASK_ENTITY extends AbsTaskEntity<
     mEntity.setState(state);
     mEntity.setComplete(state == IEntity.STATE_COMPLETE);
     if (state == IEntity.STATE_CANCEL) {
-      if (mEntity instanceof AbsNormalEntity) {
+      if (mEntity instanceof DownloadEntity) {
         TaskRecord record =
             DbEntity.findFirst(TaskRecord.class, "TaskRecord.filePath=?", mTaskEntity.getKey());
         if (record != null) {
-          CommonUtil.delTaskRecord(record, mTaskEntity.isRemoveFile(), (AbsNormalEntity) mEntity);
+          CommonUtil.delTaskRecord(record, mTaskEntity.isRemoveFile(), (DownloadEntity) mEntity);
+        } else {
+          mEntity.deleteData();
         }
-      } else if (mEntity instanceof AbsGroupEntity) {
-        CommonUtil.delGroupTaskRecord(mTaskEntity.isRemoveFile(), ((AbsGroupEntity) mEntity));
+      } else if (mEntity instanceof DownloadGroupEntity) {
+        CommonUtil.delGroupTaskRecord(mTaskEntity.isRemoveFile(), ((DownloadGroupEntity) mEntity));
       }
       //mEntity.deleteData();
       return;
diff --git a/Aria/src/main/java/com/arialyy/aria/core/download/downloader/Downloader.java b/Aria/src/main/java/com/arialyy/aria/core/download/downloader/Downloader.java
index 972f939f..999eb37e 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/download/downloader/Downloader.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/download/downloader/Downloader.java
@@ -45,23 +45,26 @@ class Downloader extends AbsFileer<DownloadEntity, DownloadTaskEntity> {
   }
 
   @Override protected int setNewTaskThreadNum() {
+    int threadNum = AriaManager.getInstance(mContext).getDownloadConfig().getThreadNum();
     return
         // 小于1m的文件或是任务组的子任务、使用虚拟文件，线程数都是1
         mEntity.getFileSize() <= SUB_LEN
             || mTaskEntity.getRequestType() == AbsTaskEntity.D_FTP_DIR
             || mTaskEntity.getRequestType() == AbsTaskEntity.DG_HTTP
-            || mRecord.isOpenDynamicFile
+            || threadNum == 1
             ? 1
-            : AriaManager.getInstance(mContext).getDownloadConfig().getThreadNum();
+            : threadNum;
   }
 
   @Override protected boolean handleNewTask() {
     CommonUtil.createFile(mTempFile.getPath());
     BufferedRandomAccessFile file = null;
     try {
-      file = new BufferedRandomAccessFile(new File(mTempFile.getPath()), "rwd", 8192);
-      //设置文件长度
-      file.setLength(mRecord.isOpenDynamicFile ? 1 : mEntity.getFileSize());
+      if (mTotalThreadNum > 1) {
+        file = new BufferedRandomAccessFile(new File(mTempFile.getPath()), "rwd", 8192);
+        //设置文件长度
+        file.setLength(mEntity.getFileSize());
+      }
       return true;
     } catch (IOException e) {
       failDownload("下载失败【downloadUrl:"
diff --git a/Aria/src/main/java/com/arialyy/aria/core/download/downloader/FtpThreadTask.java b/Aria/src/main/java/com/arialyy/aria/core/download/downloader/FtpThreadTask.java
index 125c4422..d0f17778 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/download/downloader/FtpThreadTask.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/download/downloader/FtpThreadTask.java
@@ -24,8 +24,13 @@ import com.arialyy.aria.core.download.DownloadTaskEntity;
 import com.arialyy.aria.core.inf.IDownloadListener;
 import com.arialyy.aria.util.ALog;
 import com.arialyy.aria.util.BufferedRandomAccessFile;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.nio.channels.Channels;
+import java.nio.channels.FileChannel;
+import java.nio.channels.ReadableByteChannel;
 import org.apache.commons.net.ftp.FTPClient;
 import org.apache.commons.net.ftp.FTPReply;
 
@@ -36,10 +41,6 @@ import org.apache.commons.net.ftp.FTPReply;
 class FtpThreadTask extends AbsFtpThreadTask<DownloadEntity, DownloadTaskEntity> {
   private final String TAG = "FtpThreadTask";
   private boolean isOpenDynamicFile;
-  /**
-   * 2M的动态长度
-   */
-  private final int LEN_INTERVAL = 1024 * 1024 * 2;
 
   FtpThreadTask(StateConstance constance, IDownloadListener listener,
       SubThreadConfig<DownloadTaskEntity> downloadInfo) {
@@ -49,7 +50,7 @@ class FtpThreadTask extends AbsFtpThreadTask<DownloadEntity, DownloadTaskEntity>
     mReadTimeOut = manager.getDownloadConfig().getIOTimeOut();
     mBufSize = manager.getDownloadConfig().getBuffSize();
     isNotNetRetry = manager.getDownloadConfig().isNotNetRetry();
-    isOpenDynamicFile = STATE.TASK_RECORD.isOpenDynamicFile;
+    isOpenDynamicFile = STATE.isOpenDynamicFile;
     setMaxSpeed(manager.getDownloadConfig().getMaxSpeed());
   }
 
@@ -58,7 +59,7 @@ class FtpThreadTask extends AbsFtpThreadTask<DownloadEntity, DownloadTaskEntity>
     mChildCurrentLocation = mConfig.START_LOCATION;
     FTPClient client = null;
     InputStream is = null;
-    BufferedRandomAccessFile file = null;
+
     try {
       ALog.d(TAG, "任务【"
           + mConfig.TEMP_FILE.getName()
@@ -94,31 +95,12 @@ class FtpThreadTask extends AbsFtpThreadTask<DownloadEntity, DownloadTaskEntity>
         return;
       }
 
-      file = new BufferedRandomAccessFile(mConfig.TEMP_FILE, "rwd", mBufSize);
-      file.seek(mConfig.START_LOCATION);
-      byte[] buffer = new byte[mBufSize];
-      int len;
-
-      while ((len = is.read(buffer)) != -1) {
-        if (STATE.isCancel || STATE.isStop) {
-          break;
-        }
-        if (mSleepTime > 0) Thread.sleep(mSleepTime);
-        if (isOpenDynamicFile) {
-          file.setLength(
-              STATE.CURRENT_LOCATION + LEN_INTERVAL < mEntity.getFileSize() ? STATE.CURRENT_LOCATION
-                  + LEN_INTERVAL : mEntity.getFileSize());
-        }
-        if (mChildCurrentLocation + len >= mConfig.END_LOCATION) {
-          len = (int) (mConfig.END_LOCATION - mChildCurrentLocation);
-          file.write(buffer, 0, len);
-          progress(len);
-          break;
-        } else {
-          file.write(buffer, 0, len);
-          progress(len);
-        }
+      if (isOpenDynamicFile) {
+        readDynamicFile(is);
+      } else {
+        readNormal(is);
       }
+
       if (STATE.isCancel || STATE.isStop) return;
       ALog.i(TAG, "任务【" + mConfig.TEMP_FILE.getName() + "】线程__" + mConfig.THREAD_ID + "__下载完毕");
       writeConfig(true, 1);
@@ -138,9 +120,6 @@ class FtpThreadTask extends AbsFtpThreadTask<DownloadEntity, DownloadTaskEntity>
       fail(mChildCurrentLocation, "获取流失败", e);
     } finally {
       try {
-        if (file != null) {
-          file.close();
-        }
         if (is != null) {
           is.close();
         }
@@ -153,6 +132,92 @@ class FtpThreadTask extends AbsFtpThreadTask<DownloadEntity, DownloadTaskEntity>
     }
   }
 
+  /**
+   * 动态长度文件读取方式
+   */
+  private void readDynamicFile(InputStream is) {
+    FileOutputStream fos = null;
+    FileChannel foc = null;
+    ReadableByteChannel fic = null;
+    try {
+      int len;
+      fos = new FileOutputStream(mConfig.TEMP_FILE, true);
+      foc = fos.getChannel();
+      fic = Channels.newChannel(is);
+      ByteBuffer bf = ByteBuffer.allocate(mBufSize);
+      while ((len = fic.read(bf)) != -1) {
+        if (STATE.isCancel || STATE.isStop) {
+          break;
+        }
+        if (mSleepTime > 0) {
+          Thread.sleep(mSleepTime);
+        }
+        bf.flip();
+        foc.write(bf);
+        bf.compact();
+        progress(len);
+      }
+    } catch (InterruptedException e) {
+      e.printStackTrace();
+    } catch (IOException e) {
+      fail(mChildCurrentLocation, "下载失败【" + mConfig.URL + "】", e);
+    } finally {
+      try {
+        if (fos != null) {
+          fos.close();
+        }
+        if (foc != null) {
+          foc.close();
+        }
+        if (fic != null) {
+          fic.close();
+        }
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+
+  /**
+   * 多线程写文件方式
+   */
+  private void readNormal(InputStream is) {
+    BufferedRandomAccessFile file = null;
+    try {
+      file = new BufferedRandomAccessFile(mConfig.TEMP_FILE, "rwd", mBufSize);
+      file.seek(mConfig.START_LOCATION);
+      byte[] buffer = new byte[mBufSize];
+      int len;
+      while ((len = is.read(buffer)) != -1) {
+        if (STATE.isCancel || STATE.isStop) {
+          break;
+        }
+        if (mSleepTime > 0) Thread.sleep(mSleepTime);
+        if (mChildCurrentLocation + len >= mConfig.END_LOCATION) {
+          len = (int) (mConfig.END_LOCATION - mChildCurrentLocation);
+          file.write(buffer, 0, len);
+          progress(len);
+          break;
+        } else {
+          file.write(buffer, 0, len);
+          progress(len);
+        }
+      }
+    } catch (IOException e) {
+      fail(mChildCurrentLocation, "下载失败【" + mConfig.URL + "】", e);
+    } catch (InterruptedException e) {
+      e.printStackTrace();
+    } finally {
+      try {
+        if (file != null) {
+          file.close();
+        }
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+
   @Override protected String getTaskType() {
     return "FTP_DOWNLOAD";
   }
diff --git a/Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpThreadTask.java b/Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpThreadTask.java
index b3a99db6..74d50cfb 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpThreadTask.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpThreadTask.java
@@ -26,11 +26,16 @@ import com.arialyy.aria.util.ALog;
 import com.arialyy.aria.util.BufferedRandomAccessFile;
 import com.arialyy.aria.util.CommonUtil;
 import java.io.BufferedInputStream;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.nio.ByteBuffer;
+import java.nio.channels.Channels;
+import java.nio.channels.FileChannel;
+import java.nio.channels.ReadableByteChannel;
 
 /**
  * Created by lyy on 2017/1/18.
@@ -38,10 +43,6 @@ import java.net.URL;
  */
 final class HttpThreadTask extends AbsThreadTask<DownloadEntity, DownloadTaskEntity> {
   private final String TAG = "HttpThreadTask";
-  /**
-   * 2M的动态长度
-   */
-  private final int LEN_INTERVAL = 1024 * 1024 * 2;
   private boolean isOpenDynamicFile;
 
   HttpThreadTask(StateConstance constance, IDownloadListener listener,
@@ -52,7 +53,7 @@ final class HttpThreadTask extends AbsThreadTask<DownloadEntity, DownloadTaskEnt
     mReadTimeOut = manager.getDownloadConfig().getIOTimeOut();
     mBufSize = manager.getDownloadConfig().getBuffSize();
     isNotNetRetry = manager.getDownloadConfig().isNotNetRetry();
-    isOpenDynamicFile = STATE.TASK_RECORD.isOpenDynamicFile;
+    isOpenDynamicFile = STATE.isOpenDynamicFile;
     setMaxSpeed(manager.getDownloadConfig().getMaxSpeed());
   }
 
@@ -86,15 +87,18 @@ final class HttpThreadTask extends AbsThreadTask<DownloadEntity, DownloadTaskEnt
       conn.setReadTimeout(mReadTimeOut);  //设置读取流的等待时间,必须设置该参数
 
       is = new BufferedInputStream(ConnectionHelp.convertInputStream(conn));
-      //创建可设置位置的文件
-      file = new BufferedRandomAccessFile(mConfig.TEMP_FILE, "rwd", mBufSize);
-      //设置每条线程写入文件的位置
-      file.seek(mConfig.START_LOCATION);
-
-      if (mTaskEntity.isChunked()) {
-        readChunk(is, file);
+      if (isOpenDynamicFile) {
+        readDynamicFile(is);
       } else {
-        readNormal(is, file);
+        //创建可设置位置的文件
+        file = new BufferedRandomAccessFile(mConfig.TEMP_FILE, "rwd", mBufSize);
+        //设置每条线程写入文件的位置
+        file.seek(mConfig.START_LOCATION);
+        if (mTaskEntity.isChunked()) {
+          readChunk(is, file);
+        } else {
+          readNormal(is, file);
+        }
       }
 
       if (STATE.isCancel || STATE.isStop) {
@@ -124,6 +128,52 @@ final class HttpThreadTask extends AbsThreadTask<DownloadEntity, DownloadTaskEnt
     }
   }
 
+  /**
+   * 动态长度文件读取方式
+   */
+  private void readDynamicFile(InputStream is) {
+    FileOutputStream fos = null;
+    FileChannel foc = null;
+    ReadableByteChannel fic = null;
+    try {
+      int len;
+      fos = new FileOutputStream(mConfig.TEMP_FILE, true);
+      foc = fos.getChannel();
+      fic = Channels.newChannel(is);
+      ByteBuffer bf = ByteBuffer.allocate(mBufSize);
+      while ((len = fic.read(bf)) != -1) {
+        if (STATE.isCancel || STATE.isStop) {
+          break;
+        }
+        if (mSleepTime > 0) {
+          Thread.sleep(mSleepTime);
+        }
+        bf.flip();
+        foc.write(bf);
+        bf.compact();
+        progress(len);
+      }
+    } catch (InterruptedException e) {
+      e.printStackTrace();
+    } catch (IOException e) {
+      fail(mChildCurrentLocation, "下载失败【" + mConfig.URL + "】", e);
+    } finally {
+      try {
+        if (fos != null) {
+          fos.close();
+        }
+        if (foc != null) {
+          foc.close();
+        }
+        if (fic != null) {
+          fic.close();
+        }
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+
   /**
    * 读取chunk模式的文件流
    *
@@ -148,11 +198,6 @@ final class HttpThreadTask extends AbsThreadTask<DownloadEntity, DownloadTaskEnt
       if (mSleepTime > 0) {
         Thread.sleep(mSleepTime);
       }
-      if (isOpenDynamicFile) {
-        file.setLength(
-            STATE.CURRENT_LOCATION + LEN_INTERVAL < mEntity.getFileSize() ? STATE.CURRENT_LOCATION
-                + LEN_INTERVAL : mEntity.getFileSize());
-      }
       file.write(buffer, 0, len);
       progress(len);
     }
diff --git a/Aria/src/main/java/com/arialyy/aria/core/scheduler/AbsSchedulers.java b/Aria/src/main/java/com/arialyy/aria/core/scheduler/AbsSchedulers.java
index c4857df5..13dcad08 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/scheduler/AbsSchedulers.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/scheduler/AbsSchedulers.java
@@ -311,7 +311,9 @@ abstract class AbsSchedulers<TASK_ENTITY extends AbsTaskEntity, TASK extends Abs
   private void startNextTask() {
     TASK newTask = mQueue.getNextTask();
     if (newTask == null) {
-      ALog.i(TAG, "没有下一任务");
+      if (mQueue.getCurrentExePoolNum() == 0) {
+        ALog.i(TAG, "没有下一任务");
+      }
       return;
     }
     if (newTask.getState() == IEntity.STATE_WAIT) {
diff --git a/Aria/src/main/java/com/arialyy/aria/core/upload/BaseUListener.java b/Aria/src/main/java/com/arialyy/aria/core/upload/BaseUListener.java
index b313d64a..00622cf3 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/upload/BaseUListener.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/upload/BaseUListener.java
@@ -144,15 +144,16 @@ class BaseUListener<ENTITY extends AbsEntity, TASK_ENTITY extends AbsTaskEntity<
     mEntity.setState(state);
     mEntity.setComplete(state == IEntity.STATE_COMPLETE);
     if (state == IEntity.STATE_CANCEL) {
-      if (mEntity instanceof AbsNormalEntity) {
+      if (mEntity instanceof UploadEntity) {
         TaskRecord record =
             DbEntity.findFirst(TaskRecord.class, "TaskRecord.filePath=?", mTaskEntity.getKey());
         if (record != null) {
-          CommonUtil.delTaskRecord(record, mTaskEntity.isRemoveFile(), (AbsNormalEntity) mEntity);
+          CommonUtil.delTaskRecord(record, mTaskEntity.isRemoveFile(), (UploadEntity) mEntity);
         }
-      } else if (mEntity instanceof AbsGroupEntity) {
-        CommonUtil.delGroupTaskRecord(mTaskEntity.isRemoveFile(), ((AbsGroupEntity) mEntity));
       }
+      //else if (mEntity instanceof AbsGroupEntity) {
+      //  CommonUtil.delGroupTaskRecord(mTaskEntity.isRemoveFile(), ((AbsGroupEntity) mEntity));
+      //}
       return;
     } else if (mEntity.isComplete()) {
       mEntity.setCompleteTime(System.currentTimeMillis());
diff --git a/Aria/src/main/java/com/arialyy/aria/util/CommonUtil.java b/Aria/src/main/java/com/arialyy/aria/util/CommonUtil.java
index b252e7b7..629b64ce 100644
--- a/Aria/src/main/java/com/arialyy/aria/util/CommonUtil.java
+++ b/Aria/src/main/java/com/arialyy/aria/util/CommonUtil.java
@@ -410,11 +410,10 @@ public class CommonUtil {
 
     if (records == null || records.isEmpty()) {
       ALog.w(TAG, "组任务记录删除失败，记录为null");
-      return;
-    }
-
-    for (TaskRecord tr : records) {
-      tr.deleteData();
+    } else {
+      for (TaskRecord tr : records) {
+        tr.deleteData();
+      }
     }
 
     File dir = new File(groupEntity.getDirPath());
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 5b9696df..c3a993d0 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -15,10 +15,10 @@
       android:supportsRtl="true"
       android:theme="@style/AppTheme.NoActionBar">
     <!--android:name=".test.TestGroupActivity"-->
-    <!--android:name=".test.AnyRunActivity"-->
         <!--android:name=".test.TestActivity"-->
+    <!--android:name=".MainActivity"-->
     <activity
-    android:name=".MainActivity"
+    android:name=".test.AnyRunActivity"
         android:label="@string/app_name">
       <intent-filter>
         <action android:name="android.intent.action.MAIN"/>
diff --git a/app/src/main/assets/aria_config.xml b/app/src/main/assets/aria_config.xml
index 186611b1..de9e2732 100644
--- a/app/src/main/assets/aria_config.xml
+++ b/app/src/main/assets/aria_config.xml
@@ -11,17 +11,17 @@
 
   <!--注意，修改该配置文件中的属性会覆盖代码中所设置的属性-->
   <download>
-    <!--是否开启动态文件，开启动态文件后初始化时将不占用磁盘空间，下载多少byte，占多少空间，效果见chrome的下载。-->
-    <!--注意：
-    1、使用该功能，将自动关闭多线程下载；
-    2、对于已经采用了多线程的任务，依然采用原来的下载方式；
-    3、原本参数是true，任务没下载完成，就参数改为false，那么没下载完成的任务还是会按照参数修改前的方式下载；只有新任务才会根据参数调用不同的下载方式。-->
-    <openDynamicFile value="true"/>
 
     <!--断网的时候是否重试，true：断网也重试；false：断网不重试，直接走失败的回调-->
     <notNetRetry value="true"/>
 
-    <!--设置下载线程，线程下载数改变后，新的下载任务才会生效，如果任务大小小于1m，该设置也不会生效-->
+    <!--设置下载线程数，下载线程数不能小于1
+      注意：
+      1、线程下载数改变后，新的下载任务才会生效；
+      2、如果任务大小小于1m，该设置不会生效；
+      3、从3.4.1开始，如果线程数为1，文件初始化时将不再预占用对应长度的空间，下载多少byte，则占多大的空间；
+         对于采用多线程的任务或旧任务，依然采用原来的文件空间占用方式；
+    -->
     <threadNum value="3"/>
 
     <!--设置下载队列最大任务数， 默认为2-->
diff --git a/app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java b/app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java
index 4ef74def..d99c955e 100644
--- a/app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java
+++ b/app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java
@@ -15,9 +15,9 @@ public class AnyRunActivity extends BaseActivity<ActivityTestBinding> {
   AnyRunnModule module;
   String[] urls;
   int index = 0;
-  //String URL = "http://static.gaoshouyou.com/d/12/0d/7f120f50c80d2e7b8c4ba24ece4f9cdd.apk";
+  String URL = "http://static.gaoshouyou.com/d/12/0d/7f120f50c80d2e7b8c4ba24ece4f9cdd.apk";
   //String URL = "http://static.gaoshouyou.com/d/22/94/822260b849944492caadd2983f9bb624.apk";
-  private final String URL = "ftp://192.168.29.140:21/download/AriaPrj.rar";
+  //private final String URL = "ftp://192.168.29.140:21/download/AriaPrj.rar";
   //String URL = "https://dl.genymotion.com/releases/genymotion-2.12.1/genymotion-2.12.1-vbox.exe";
 
   @Override protected int setLayoutId() {
@@ -42,7 +42,8 @@ public class AnyRunActivity extends BaseActivity<ActivityTestBinding> {
         //}
         //for (int i = 0; i < 10; i++) {
 
-        module.startFtp(URL);
+        //module.startFtp(URL);
+        module.start(URL);
         //}
         //List<AbsEntity> list = Aria.download(this).getTotalTaskList();
         //ALog.d(TAG, "size ==> " + list.size());
diff --git a/app/src/main/java/com/arialyy/simple/test/AnyRunnModule.java b/app/src/main/java/com/arialyy/simple/test/AnyRunnModule.java
index 7d276022..19dd6b8a 100644
--- a/app/src/main/java/com/arialyy/simple/test/AnyRunnModule.java
+++ b/app/src/main/java/com/arialyy/simple/test/AnyRunnModule.java
@@ -68,7 +68,7 @@ public class AnyRunnModule {
         .load(url)
         //.addHeader("Accept-Encoding", "gzip")
         .setRequestMode(RequestEnum.GET)
-        .setFilePath(Environment.getExternalStorageDirectory().getPath() + "/ggsg123456.apk")
+        .setFilePath(Environment.getExternalStorageDirectory().getPath() + "/ggsg1234567.apk")
         //.resetState()
         .start();
     //String[] urls = new String[] {
diff --git a/aria/src/main/java/com/arialyy/aria/core/Configuration.java b/aria/src/main/java/com/arialyy/aria/core/Configuration.java
index 85b71691..51539db5 100644
--- a/aria/src/main/java/com/arialyy/aria/core/Configuration.java
+++ b/aria/src/main/java/com/arialyy/aria/core/Configuration.java
@@ -366,6 +366,11 @@ class Configuration {
     String caName;
     /**
      * 下载线程数，下载线程数不能小于1
+     * 注意：
+     * 1、线程下载数改变后，新的下载任务才会生效；
+     * 2、如果任务大小小于1m，该设置不会生效；
+     * 3、从3.4.1开始，如果线程数为1，文件初始化时将不再预占用对应长度的空间，下载多少byte，则占多大的空间；
+     * 对于采用多线程的任务或旧任务，依然采用原来的文件空间占用方式；
      */
     int threadNum = 3;
 
@@ -374,26 +379,6 @@ class Configuration {
      */
     int maxSpeed = 0;
 
-    /**
-     * 是否开启动态文件，开启动态文件后初始化时将不占用磁盘空间，下载多少byte，占多少空间，效果见chrome的下载
-     * 注意：
-     * 1、使用该功能，将自动关闭多线程下载；
-     * 2、对于已经采用了多线程的任务，依然采用原来的下载方式；
-     * 3、原本参数是true，任务没下载完成，就参数改为false，那么没下载完成的任务还是会按照参数修改前的方式下载，只有新任务才会根据参数调用不同的下载方式
-     * {@code true}使用
-     */
-    boolean openDynamicFile = true;
-
-    public DownloadConfig setOpenDynamicFile(boolean openDynamicFile) {
-      this.openDynamicFile = openDynamicFile;
-      saveKey("openDynamicFile", String.valueOf(openDynamicFile));
-      return this;
-    }
-
-    public boolean isOpenDynamicFile() {
-      return openDynamicFile;
-    }
-
     public DownloadConfig setMaxTaskNum(int maxTaskNum) {
       oldMaxTaskNum = this.maxTaskNum;
       this.maxTaskNum = maxTaskNum;