diff --git a/Aria/src/main/java/com/arialyy/aria/core/AriaManager.java b/Aria/src/main/java/com/arialyy/aria/core/AriaManager.java
index a562e53b..4b9dc368 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/AriaManager.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/AriaManager.java
@@ -115,7 +115,6 @@ import java.util.concurrent.ConcurrentHashMap;
     initDb(APP);
     regAppLifeCallback(APP);
     initAria();
-    amendTaskState();
   }
 
   public Context getAPP() {
@@ -137,6 +136,7 @@ import java.util.concurrent.ConcurrentHashMap;
       }
     }
     mDbWrapper = DelegateWrapper.init(context.getApplicationContext());
+    amendTaskState();
   }
 
   private void initAria() {
diff --git a/Aria/src/main/java/com/arialyy/aria/core/common/controller/BuilderController.java b/Aria/src/main/java/com/arialyy/aria/core/common/controller/BuilderController.java
index 70002c01..586b243d 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/common/controller/BuilderController.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/common/controller/BuilderController.java
@@ -30,7 +30,7 @@ public final class BuilderController extends FeatureController implements IStart
   }
 
   /**
-   * 添加任务
+   * 添加任务，只添加任务不进行下载
    *
    * @return 正常添加，返回任务id，否则返回-1
    */
diff --git a/DEV_LOG.md b/DEV_LOG.md
index 6d6cae72..17a10a44 100644
--- a/DEV_LOG.md
+++ b/DEV_LOG.md
@@ -1,6 +1,7 @@
 ## 开发日志
-  + v_3.8.2
+  + v_3.8.3
     - fix bug https://github.com/AriaLyy/Aria/issues/573
+    - android P适配 https://github.com/AriaLyy/Aria/issues/581
   + v_3.8.1 (2019/12/22)
     - 修复一个表创建失败的问题 https://github.com/AriaLyy/Aria/issues/570
     - 修复一个非分块模式下导致下载失败的问题 https://github.com/AriaLyy/Aria/issues/571
diff --git a/FtpComponent/src/main/java/com/arialyy/aria/ftp/download/FtpDFileInfoThread.java b/FtpComponent/src/main/java/com/arialyy/aria/ftp/download/FtpDFileInfoThread.java
index a9f35116..39f55101 100644
--- a/FtpComponent/src/main/java/com/arialyy/aria/ftp/download/FtpDFileInfoThread.java
+++ b/FtpComponent/src/main/java/com/arialyy/aria/ftp/download/FtpDFileInfoThread.java
@@ -38,7 +38,7 @@ class FtpDFileInfoThread extends AbsFtpInfoThread<DownloadEntity, DTaskWrapper>
 
   @Override protected void handleFile(String remotePath, FTPFile ftpFile) {
     super.handleFile(remotePath, ftpFile);
-    if (!FileUtil.checkSDMemorySpace(mEntity.getFilePath(), ftpFile.getSize())) {
+    if (!FileUtil.checkMemorySpace(mEntity.getFilePath(), ftpFile.getSize())) {
       mCallback.onFail(mEntity, new AriaIOException(TAG,
               String.format("获取ftp文件信息失败，内存空间不足, filePath: %s", mEntity.getFilePath())),
           false);
diff --git a/HttpComponent/src/main/java/com/arialyy/aria/http/HttpFileInfoThread.java b/HttpComponent/src/main/java/com/arialyy/aria/http/HttpFileInfoThread.java
index e484c5cc..f910ae02 100644
--- a/HttpComponent/src/main/java/com/arialyy/aria/http/HttpFileInfoThread.java
+++ b/HttpComponent/src/main/java/com/arialyy/aria/http/HttpFileInfoThread.java
@@ -125,7 +125,7 @@ public class HttpFileInfoThread implements Runnable {
     }
     long len = lenAdapter.handleFileLen(conn.getHeaderFields());
 
-    if (!FileUtil.checkSDMemorySpace(mEntity.getFilePath(), len)) {
+    if (!FileUtil.checkMemorySpace(mEntity.getFilePath(), len)) {
       failDownload(new TaskException(TAG,
           String.format("下载失败，内存空间不足；filePath: %s, url: %s", mEntity.getDownloadPath(),
               mEntity.getUrl())), false);
diff --git a/PublicComponent/src/main/java/com/arialyy/aria/util/FileUtil.java b/PublicComponent/src/main/java/com/arialyy/aria/util/FileUtil.java
index f954c7f9..b5c8bd26 100644
--- a/PublicComponent/src/main/java/com/arialyy/aria/util/FileUtil.java
+++ b/PublicComponent/src/main/java/com/arialyy/aria/util/FileUtil.java
@@ -375,76 +375,25 @@ public class FileUtil {
   }
 
   /**
-   * 检查SD内存空间是否充足
+   * 检查内存空间是否充足
    *
-   * @param filePath 文件保存路径
-   * @param fileSize 文件大小
-   * @return {@code false} 内存空间不足，{@code true}内存空间足够
+   * @param path 文件路径
+   * @param fileSize 下载的文件的大小
+   * @return true 空间足够
    */
-  public static boolean checkSDMemorySpace(String filePath, long fileSize) {
-    List<String> dirs = FileUtil.getSDPathList(AriaConfig.getInstance().getAPP());
-    if (dirs == null || dirs.isEmpty()) {
-      return true;
-    }
-    for (String path : dirs) {
-      if (filePath.contains(path)) {
-        if (fileSize > 0 && fileSize > getAvailableExternalMemorySize(path)) {
-          return false;
-        }
+  public static boolean checkMemorySpace(String path, long fileSize) {
+    File temp = new File(path);
+    if (!temp.exists()){
+      if (!temp.getParentFile().exists()){
+        FileUtil.createDir(temp.getParentFile().getPath());
       }
+      path = temp.getParentFile().getPath();
     }
-    return true;
-  }
 
-  /**
-   * sdcard 可用大小
-   *
-   * @param sdcardPath sdcard 根路径
-   * @return 单位为：byte
-   */
-  public static long getAvailableExternalMemorySize(String sdcardPath) {
-    StatFs stat = new StatFs(sdcardPath);
+    StatFs stat = new StatFs(path);
     long blockSize = stat.getBlockSize();
     long availableBlocks = stat.getAvailableBlocks();
-    return availableBlocks * blockSize;
-  }
-
-  /**
-   * sdcard 总大小
-   *
-   * @param sdcardPath sdcard 根路径
-   * @return 单位为：byte
-   */
-  public static long getTotalExternalMemorySize(String sdcardPath) {
-    StatFs stat = new StatFs(sdcardPath);
-    long blockSize = stat.getBlockSize();
-    long totalBlocks = stat.getBlockCount();
-    return totalBlocks * blockSize;
-  }
-
-  /**
-   * 获取SD卡目录列表
-   */
-  public static List<String> getSDPathList(Context context) {
-    List<String> paths = null;
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
-      try {
-        paths = getVolumeList(context);
-      } catch (ClassNotFoundException e) {
-        e.printStackTrace();
-      } catch (NoSuchMethodException e) {
-        e.printStackTrace();
-      } catch (IllegalAccessException e) {
-        e.printStackTrace();
-      } catch (InvocationTargetException e) {
-        e.printStackTrace();
-      }
-    } else {
-      List<String> mounts = readMountsFile();
-      List<String> volds = readVoldFile();
-      paths = compareMountsWithVold(mounts, volds);
-    }
-    return paths;
+    return fileSize <= availableBlocks * blockSize;
   }
 
   /**
@@ -495,11 +444,83 @@ public class FileUtil {
     }
   }
 
+  /**
+   * 检查SD内存空间是否充足
+   *
+   * @param filePath 文件保存路径
+   * @param fileSize 文件大小
+   * @return {@code false} 内存空间不足，{@code true}内存空间足够
+   */
+  @Deprecated
+  private static boolean checkSDMemorySpace(String filePath, long fileSize) {
+    List<String> dirs = FileUtil.getSDPathList(AriaConfig.getInstance().getAPP());
+    if (dirs == null || dirs.isEmpty()) {
+      return true;
+    }
+    for (String path : dirs) {
+      if (filePath.contains(path)) {
+        if (fileSize > 0 && fileSize > getAvailableExternalMemorySize(path)) {
+          return false;
+        }
+      }
+    }
+    return true;
+  }
+
+  /**
+   * sdcard 可用大小
+   *
+   * @param sdcardPath sdcard 根路径
+   * @return 单位为：byte
+   */
+  private static long getAvailableExternalMemorySize(String sdcardPath) {
+    StatFs stat = new StatFs(sdcardPath);
+    long blockSize = stat.getBlockSize();
+    long availableBlocks = stat.getAvailableBlocks();
+    return availableBlocks * blockSize;
+  }
+
+  /**
+   * sdcard 总大小
+   *
+   * @param sdcardPath sdcard 根路径
+   * @return 单位为：byte
+   */
+  private static long getTotalExternalMemorySize(String sdcardPath) {
+    StatFs stat = new StatFs(sdcardPath);
+    long blockSize = stat.getBlockSize();
+    long totalBlocks = stat.getBlockCount();
+    return totalBlocks * blockSize;
+  }
+
+  /**
+   * 获取SD卡目录列表
+   */
+  private static List<String> getSDPathList(Context context) {
+    List<String> paths = null;
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+      try {
+        paths = getVolumeList(context);
+      } catch (NoSuchMethodException e) {
+        e.printStackTrace();
+      } catch (IllegalAccessException e) {
+        e.printStackTrace();
+      } catch (InvocationTargetException e) {
+        e.printStackTrace();
+      }
+    } else {
+      List<String> mounts = readMountsFile();
+      List<String> volds = readVoldFile();
+      paths = compareMountsWithVold(mounts, volds);
+    }
+    return paths;
+  }
+
   /**
    * getSDPathList
    */
   private static List<String> getVolumeList(final Context context)
-      throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException,
+      throws NoSuchMethodException, InvocationTargetException,
       IllegalAccessException {
     List<String> pathList = new ArrayList<>();
 
@@ -589,7 +610,7 @@ public class FileUtil {
    *
    * @return paths to all available SD-Cards in the system (include emulated)
    */
-  public static List<String> getStorageDirectories() {
+  private static List<String> getStorageDirectories() {
     // Final set of paths
     final List<String> rv = new ArrayList<>();
     // Primary physical SD-CARD (not emulated)
diff --git a/app/src/main/assets/aria_config.xml b/app/src/main/assets/aria_config.xml
index cb8d1c24..8ac9205c 100644
--- a/app/src/main/assets/aria_config.xml
+++ b/app/src/main/assets/aria_config.xml
@@ -44,7 +44,7 @@
     <threadNum value="3"/>
 
     <!--设置下载队列最大任务数， 默认为2-->
-    <maxTaskNum value="3"/>
+    <maxTaskNum value="1"/>
 
     <!--设置下载失败，重试次数，默认为10-->
     <reTryNum value="5"/>
diff --git a/app/src/main/java/com/arialyy/simple/MainActivity.java b/app/src/main/java/com/arialyy/simple/MainActivity.java
index cbf32eb2..8ac51204 100644
--- a/app/src/main/java/com/arialyy/simple/MainActivity.java
+++ b/app/src/main/java/com/arialyy/simple/MainActivity.java
@@ -29,7 +29,6 @@ import androidx.lifecycle.ViewModelProviders;
 import androidx.recyclerview.widget.DividerItemDecoration;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
-import com.arialyy.aria.core.AriaManager;
 import com.arialyy.frame.permission.OnPermissionCallback;
 import com.arialyy.frame.permission.PermissionManager;
 import com.arialyy.frame.util.show.T;
diff --git a/app/src/main/java/com/arialyy/simple/core/download/SingleTaskActivity.java b/app/src/main/java/com/arialyy/simple/core/download/SingleTaskActivity.java
index c6b238f6..801b91f0 100644
--- a/app/src/main/java/com/arialyy/simple/core/download/SingleTaskActivity.java
+++ b/app/src/main/java/com/arialyy/simple/core/download/SingleTaskActivity.java
@@ -20,6 +20,7 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.StatFs;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -32,7 +33,6 @@ import androidx.lifecycle.ViewModelProviders;
 import com.arialyy.annotations.Download;
 import com.arialyy.aria.core.Aria;
 import com.arialyy.aria.core.common.HttpOption;
-import com.arialyy.aria.core.common.RequestEnum;
 import com.arialyy.aria.core.download.DownloadEntity;
 import com.arialyy.aria.core.inf.IEntity;
 import com.arialyy.aria.core.listener.ISchedulers;
@@ -40,16 +40,13 @@ import com.arialyy.aria.core.processor.IHttpFileLenAdapter;
 import com.arialyy.aria.core.task.DownloadTask;
 import com.arialyy.aria.util.ALog;
 import com.arialyy.aria.util.CommonUtil;
-import com.arialyy.aria.util.FileUtil;
 import com.arialyy.frame.util.show.T;
 import com.arialyy.simple.R;
 import com.arialyy.simple.base.BaseActivity;
 import com.arialyy.simple.common.ModifyPathDialog;
 import com.arialyy.simple.common.ModifyUrlDialog;
 import com.arialyy.simple.databinding.ActivitySingleBinding;
-import com.arialyy.simple.util.AppUtil;
 import java.io.File;
-import java.io.IOException;
 import java.util.List;
 import java.util.Map;
 
diff --git a/app/src/main/java/com/arialyy/simple/core/download/group/GroupModule.java b/app/src/main/java/com/arialyy/simple/core/download/group/GroupModule.java
index d35708f4..907e39ce 100644
--- a/app/src/main/java/com/arialyy/simple/core/download/group/GroupModule.java
+++ b/app/src/main/java/com/arialyy/simple/core/download/group/GroupModule.java
@@ -54,6 +54,13 @@ public class GroupModule extends BaseModule {
     return names;
   }
 
+  List<String> getSubName1() {
+    List<String> names = new ArrayList<>();
+    String[] str = getContext().getResources().getStringArray(R.array.group_names);
+    Collections.addAll(names, str);
+    return names;
+  }
+
   List<String> getSubName2() {
     List<String> taskSubFile;
     taskSubFile = new ArrayList<>();
diff --git a/build.gradle b/build.gradle
index 63797bf6..84852cd5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -44,8 +44,8 @@ task clean(type: Delete) {
 }
 
 ext {
-  versionCode = 381
-  versionName = '3.8.1'
+  versionCode = 383
+  versionName = '3.8.3_beta'
   userOrg = 'arialyy'
   groupId = 'com.arialyy.aria'
   publishVersion = versionName