增加组任务中单个任务下载失败后，最终组任务回调stop/fail设置

PublicComponent/src/main/java/com/arialyy/aria/core/config/DGroupConfig.java

@@ -31,6 +31,11 @@ public class DGroupConfig extends BaseTaskConfig implements Serializable {
    */
   int subMaxTaskNum = 3;
 
+  /**
+   * 子任务失败时回调stop，默认true
+   */
+  private boolean subFailAsStop = true;
+
   /**
    * 子任务重试次数，默认为5
    */
@@ -118,4 +123,14 @@ public class DGroupConfig extends BaseTaskConfig implements Serializable {
     save();
     return this;
   }
+
+  public boolean isSubFailAsStop() {
+    return subFailAsStop;
+  }
+
+  public DGroupConfig setSubFailAsStop(boolean subFailAsStop) {
+    this.subFailAsStop = subFailAsStop;
+    save();
+    return this;
+  }
 }

PublicComponent/src/main/java/com/arialyy/aria/core/config/XMLReader.java

@@ -144,6 +144,10 @@ public class XMLReader extends DefaultHandler {
           int subMaxTaskNum = checkInt(value) ? Integer.parseInt(value) : 3;
           setField("subMaxTaskNum", subMaxTaskNum, ConfigType.D_GROUP);
           break;
+        case "subFailAsStop": // 子任务失败时回调stop
+          setField("subFailAsStop", checkBoolean(value) ? Boolean.valueOf(value) : false,
+                  ConfigType.D_GROUP);
+          break;
         case "subReTryNum": // 子任务重试次数
           int subReTryNum = checkInt(value) ? Integer.parseInt(value) : 5;
           setField("subReTryNum", subReTryNum, ConfigType.D_GROUP);

PublicComponent/src/main/java/com/arialyy/aria/core/group/SimpleSchedulers.java

@@ -179,6 +179,9 @@ final class SimpleSchedulers implements Handler.Callback {
         == mGState.getSubSize()) {
       if (mGState.getStopNum() == 0 && mGState.getFailNum() == 0) {
         mGState.listener.onComplete();
+      } else if(mGState.getStopNum() == 0&&!Configuration.getInstance().dGroupCfg.isSubFailAsStop() ){
+        mGState.listener.onFail(false, new AriaException(TAG,
+                String.format("任务组【%s】下载失败", mGState.getGroupHash())));
       } else {
         mGState.listener.onStop(mGState.getProgress());
       }