新增合并文件失败回调

PublicComponent/src/main/java/com/arialyy/aria/core/loader/NormalThreadStateManager.java

@@ -19,6 +19,7 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
+import android.util.Log;
 import com.arialyy.aria.core.TaskRecord;
 import com.arialyy.aria.core.inf.IThreadStateManager;
 import com.arialyy.aria.core.listener.IEventListener;
@@ -112,7 +113,7 @@ public class NormalThreadStateManager implements IThreadStateManager {
               if (mergeFile()) {
                 mListener.onComplete();
               } else {
-                mListener.onFail(false, null);
+                mListener.onFail(false, new AriaException("Merge File Failed"));
               }
               quitLooper();
               break;
@@ -253,8 +254,12 @@ public class NormalThreadStateManager implements IThreadStateManager {
    * @return {@code true} 合并成功，{@code false}合并失败
    */
   private boolean mergeFile() {
+    Log.d(TAG, "mergeFile: mTaskRecord.threadNum=" + mTaskRecord.threadNum);
     if (mTaskRecord.threadNum == 1) {
       File targetFile = new File(mTaskRecord.filePath);
+      Log.d(TAG, "mergeFile: mTaskRecord.fileLength=" + mTaskRecord.fileLength
+              + ",targetFile.length()=" + targetFile.length() + ",targetFile.exists()=" + targetFile.exists()
+              + ",mTaskRecord.filePath" + mTaskRecord.filePath);
       if (targetFile.exists()){
         //没有获得文件长度：不支持断点续传
         if (mTaskRecord.fileLength == 0 && targetFile.length() != 0) {