readme 编写

README.md

@@ -1,6 +1,13 @@
 # DownloadUtil
-这是android 文件下载工具类，实现了多线程断点续传功能</br>
-如果你觉得我的代码对你有帮助，请麻烦你在右上角给我一个star.^_^
+android 多线程多任务断点续传工具，使用该工具，你可以很容易实现复杂的下载功能</br>
++ 特点：
+ - 通过命令控制下载
+ - 可在广播中接收任务的各种下载状态
+ - 支持多任务调度
+ - 多任务状态控制
+ - 支持任务自动切换
+
+如果你觉得我的代码对你有帮助，请麻烦你在右上角给我一个star.`^_^`
 
 #下载
 [![Download](https://api.bintray.com/packages/arialyy/maven/MTDownloadUtil/images/download.svg)](https://bintray.com/arialyy/maven/MTDownloadUtil/_latestVersion)<br/>
@@ -8,8 +15,125 @@ compile 'com.arialyy.downloadutil:DownloadUtil:1.0.2'
 
 
 #示例
-![例子图](https://github.com/AriaLyy/DownloadUtil/blob/master/img/11.gif "")
+![多任务下载](https://github.com/AriaLyy/DownloadUtil/blob/v_2.0/img/download_img.gif)
+![单任务下载](https://github.com/AriaLyy/DownloadUtil/blob/master/img/11.gif "")
 
+# 使用
+* 一、在Application注册下载器
+```java
+public class BaseApplication extends Application {
+  @Override public void onCreate() {
+    super.onCreate();
+    //注册下载器
+    DownloadManager.init(this);
+  }
+}
+```
+
+* 二、创建广播接收器，用来接收下载的各种状态
+```java
+private BroadcastReceiver mReceiver = new BroadcastReceiver() {
+    long len = 0;
+    @Override public void onReceive(Context context, Intent intent) {
+      String action = intent.getAction();
+      //可以通过intent获取到下载实体，下载实体中包含了各种下载状态
+      DownloadEntity entity = intent.getParcelableExtra(DownloadManager.ENTITY);
+      switch (action) {
+        case DownloadManager.ACTION_PRE:  //预处理
+          break;
+        case DownloadManager.ACTION_POST_PRE: //预处理完成
+          //预处理完成，便可以获取文件的下载长度了
+          len = entity.getFileSize();
+          break;
+        case DownloadManager.ACTION_START:  //开始下载
+          L.d(TAG, "download start");
+          break;
+        case DownloadManager.ACTION_RESUME: //恢复下载
+          L.d(TAG, "download resume");
+          long location = intent.getLongExtra(DownloadManager.CURRENT_LOCATION, 1);
+          mUpdateHandler.obtainMessage(DOWNLOAD_RESUME, location).sendToTarget();
+          break;
+        case DownloadManager.ACTION_RUNNING:  //下载中
+          long current = intent.getLongExtra(DownloadManager.CURRENT_LOCATION, 0);
+          break;
+        case DownloadManager.ACTION_STOP:   //停止下载
+          L.d(TAG, "download stop");
+          break;
+        case DownloadManager.ACTION_COMPLETE: //下载完成
+          mUpdateHandler.sendEmptyMessage(DOWNLOAD_COMPLETE);
+          break;
+        case DownloadManager.ACTION_CANCEL:   //取消下载
+          mUpdateHandler.sendEmptyMessage(DOWNLOAD_CANCEL);
+          break;
+        case DownloadManager.ACTION_FAIL:     // 下载失败
+          mUpdateHandler.sendEmptyMessage(DOWNLOAD_FAILE);
+          break;
+      }
+    }
+  };
+```
+
+* 三、在Activity中创建广播过滤器
+```java
+@Override protected void onResume() {
+  super.onResume();
+  IntentFilter filter = new IntentFilter();
+  filter.addDataScheme(getPackageName());
+  filter.addAction(DownloadManager.ACTION_PRE);
+  filter.addAction(DownloadManager.ACTION_POST_PRE);
+  filter.addAction(DownloadManager.ACTION_RESUME);
+  filter.addAction(DownloadManager.ACTION_START);
+  filter.addAction(DownloadManager.ACTION_RUNNING);
+  filter.addAction(DownloadManager.ACTION_STOP);
+  filter.addAction(DownloadManager.ACTION_CANCEL);
+  filter.addAction(DownloadManager.ACTION_COMPLETE);
+  filter.addAction(DownloadManager.ACTION_FAIL);
+  registerReceiver(mReceiver, filter);
+}
+```
+
+* 四、创建下载实体
+```java
+  DownloadEntity entity = new DownloadEntity();
+  entity.setFileName(fileName);          //设置文件名
+  entity.setDownloadUrl(downloadUrl);    //设置下载链接
+  entity.setDownloadPath(downloadPath);  //设置存放路径
+```
+
++ 五、通过命令控制下载(下载状态控制，或下载任务切换将自动完成)
+ - 获取命令工厂实例和下载管理器实例
+ ```java
+ CmdFactory factory = CmdFactory.getInstance();
+ DownloadManager manager = DownloadManager.getInstance();
+ ```
+ - 开始命令、恢复下载命令都是同一个
+ ```java
+ private void start() {
+   List<IDownloadCmd> commands = new ArrayList<>();
+   IDownloadCmd       addCMD   = factory.createCmd(this, mEntity, CmdFactory.TASK_CREATE);
+   IDownloadCmd       startCmd = factory.createCmd(this, mEntity, CmdFactory.TASK_START);
+   commands.add(addCMD);
+   commands.add(startCmd);
+   manager.setCmds(commands).exe();
+ }
+ ```
+ - 停止命令
+ ```java
+ private void stop() {
+   IDownloadCmd stopCmd = factory.createCmd(this, mEntity, CmdFactory.TASK_STOP);
+   manager.setCmd(stopCmd).exe();
+ }
+ ```
+ - 取消命令（取消下载、删除下载任务）
+ ```java
+ private void cancel() {
+    IDownloadCmd cancelCmd = factory.createCmd(this, mEntity, CmdFactory.TASK_CANCEL);
+    manager.setCmd(cancelCmd).exe();
+ }
+ ```
+
+# 开发日志
+ + v_2.1.0 修复大量bug
 
 License
 -------

downloadutil/build.gradle

@@ -6,8 +6,8 @@ android {
     defaultConfig {
         minSdkVersion 9
         targetSdkVersion 23
-        versionCode 56
-        versionName "2.0.0"
+        versionCode 58
+        versionName "2.1.0"
     }
     buildTypes {
         release {