bug 修复，readme编写

Aria/build.gradle

@@ -29,32 +29,32 @@ dependencies {
 //apply from: 'jcenter.gradle'
 
 // Jar
-task androidJar(type: Jar) {
-  dependsOn assemble
-  group 'Build'
-  description 'blah blah'
-  from zipTree(
-      'build/intermediates/bundles/release/classes.jar')
-  from zipTree(
-      '../AriaCompiler/build/libs/AriaCompiler.jar')
-  from zipTree(
-      '../AriaAnnotation/build/libs/AriaAnnotation.jar')
-
-}
-
-
-// javadoc tasks
-android.libraryVariants.all { variant ->
-  task("javadoc${variant.name.capitalize()}", type: Javadoc) {
-    description "Generates Javadoc for $variant.name."
-    group 'Docs'
-    source = variant.javaCompile.source
-    source "../AriaAnnotation/src/main/java"
-
-    exclude '**/BuildConfig.java'
-    exclude '**/R.java'
-  }
-}
+//task androidJar(type: Jar) {
+//  dependsOn assemble
+//  group 'Build'
+//  description 'blah blah'
+//  from zipTree(
+//      'build/intermediates/bundles/release/classes.jar')
+//  from zipTree(
+//      '../AriaCompiler/build/libs/AriaCompiler.jar')
+//  from zipTree(
+//      '../AriaAnnotation/build/libs/AriaAnnotation.jar')
+//
+//}
+//
+//
+//// javadoc tasks
+//android.libraryVariants.all { variant ->
+//  task("javadoc${variant.name.capitalize()}", type: Javadoc) {
+//    description "Generates Javadoc for $variant.name."
+//    group 'Docs'
+//    source = variant.javaCompile.source
+//    source "../AriaAnnotation/src/main/java"
+//
+//    exclude '**/BuildConfig.java'
+//    exclude '**/R.java'
+//  }
+//}
 
 
 publish {

Aria/src/main/java/com/arialyy/aria/core/download/DownloadTask.java

@@ -28,6 +28,7 @@ import com.arialyy.aria.core.scheduler.DownloadSchedulers;
 import com.arialyy.aria.core.scheduler.ISchedulers;
 import com.arialyy.aria.util.CheckUtil;
 import com.arialyy.aria.util.CommonUtil;
+import java.io.File;
 import java.lang.ref.WeakReference;
 
 /**
@@ -50,6 +51,19 @@ public class DownloadTask extends AbsTask<DownloadTaskEntity, DownloadEntity> {
     mUtil = new DownloadUtil(mContext, taskEntity, mListener);
   }
 
+  /**
+   * 获取文件保存路径
+   *
+   * @return 如果路径不存在，返回null
+   */
+  public String getDownloadPath() {
+    File file = new File(mEntity.getDownloadPath());
+    if (!file.exists()) {
+      return null;
+    }
+    return mEntity.getDownloadPath();
+  }
+
   /**
    * 获取当前下载任务的下载地址
    *

Aria/src/main/java/com/arialyy/aria/core/download/DownloadUtil.java

@@ -332,7 +332,7 @@ class DownloadUtil implements IDownloadUtil, Runnable {
         rl++;
       }
       if (i == (THREAD_NUM - 1)) {
-        //如果整个文件的大小不为线程个数的整数倍，则最后一个线程的结束位置即为文件的总长度
+        //最后一个线程的结束位置即为文件的总长度
         endL = fileLength;
       }
       addSingleTask(i, startL, endL, fileLength);

Aria/src/main/java/com/arialyy/aria/core/download/SingleThreadTask.java

@@ -65,8 +65,8 @@ final class SingleThreadTask implements Runnable {
     if (-0.9999 < maxSpeed && maxSpeed < 0.00001) {
       mSleepTime = 0;
     } else {
-      BigDecimal db = new BigDecimal((mBufSize / 1024) / maxSpeed * 1000);
-      db.setScale(2, BigDecimal.ROUND_UP);
+      BigDecimal db = new BigDecimal(((mBufSize / 1024) / maxSpeed) * 1000);
+      db.setScale(0, BigDecimal.ROUND_HALF_UP);
       mSleepTime = db.longValue();
       //mSleepTime = (long) ((mBufSize / 1024) * CONSTANCE.THREAD_NUM / maxSpeed * 1000);
       //mSleepTime = (long) ((mBufSize / 1024) / maxSpeed * 1000);
@@ -91,7 +91,8 @@ final class SingleThreadTask implements Runnable {
             + "】");
         //在头里面请求下载开始位置和结束位置
         conn.setRequestProperty("Range",
-            "bytes=" + mConfigEntity.START_LOCATION + "-" + mConfigEntity.END_LOCATION);
+            "bytes=" + mConfigEntity.START_LOCATION + "-" + (mConfigEntity.END_LOCATION - 1));
+            //"bytes=" + mConfigEntity.START_LOCATION + "-" + (mConfigEntity.END_LOCATION));
       } else {
         Log.w(TAG, "该下载不支持断点");
       }
@@ -116,7 +117,6 @@ final class SingleThreadTask implements Runnable {
           break;
         }
         Thread.sleep(mSleepTime);
-        //把下载数据数据写入文件
         file.write(buffer, 0, len);
         progress(len);
       }

Aria/src/main/java/com/arialyy/aria/core/inf/AbsTarget.java

@@ -38,6 +38,16 @@ public abstract class AbsTarget<ENTITY extends AbsEntity, TASK_ENTITY extends Ab
   protected TASK_ENTITY taskEntity;
   protected String targetName;
 
+  /**
+   * 设置扩展字段，用来保存你的其它数据，如果你的数据比较多，你可以把你的数据转换为JSON字符串，然后再存到Aria中
+   *
+   * @param str 扩展数据
+   */
+  public AbsTarget setExtendField(String str) {
+    entity.setStr(str);
+    return this;
+  }
+
   /**
    * 获取任务状态
    *

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

@@ -75,6 +75,7 @@ public class CommonUtil {
     }
 
     String calculatedDigest = getFileMD5(updateFile);
+    Log.d(TAG, "fileMd5Code：" + calculatedDigest);
     if (calculatedDigest == null) {
       Log.e(TAG, "calculatedDigest null");
       return false;