DownloadUtil 重命名为 Aria，代码已重构，使用起来更加简便

Aria/src/main/java/com/arialyy/aria/util/CheckUtil.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2016 AriaLyy(DownloadUtil)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package com.arialyy.aria.util;
+
+import android.text.TextUtils;
+import android.util.Log;
+import com.arialyy.aria.core.DownloadEntity;
+import java.io.File;
+
+/**
+ * Created by Lyy on 2016/9/23.
+ * 检查帮助类
+ */
+public class CheckUtil {
+  private static final String TAG = "CheckUtil";
+
+  /**
+   * 检测下载实体是否合法
+   *
+   * @param entity 下载实体
+   * @return 合法(true)
+   */
+  public static boolean checkDownloadEntity(DownloadEntity entity) {
+    if (entity == null) {
+      Log.w(TAG, "下载实体不能为空");
+      return false;
+    } else if (TextUtils.isEmpty(entity.getDownloadUrl())) {
+      Log.w(TAG, "下载链接不能为空");
+      return false;
+    } else if (TextUtils.isEmpty(entity.getFileName())) {
+      Log.w(TAG, "文件名不能为空");
+      return false;
+    } else if (TextUtils.isEmpty(entity.getDownloadPath())) {
+      Log.w(TAG, "存储地址不能为空");
+      return false;
+    }
+    String fileName = entity.getFileName();
+    if (fileName.contains(" ")) {
+      fileName = fileName.replace(" ", "_");
+    }
+    String dPath = entity.getDownloadPath();
+    File   file  = new File(dPath);
+    if (file.isDirectory()) {
+      dPath += fileName;
+      entity.setDownloadPath(dPath);
+    }
+    return true;
+  }
+}