下载器编写

downloadutil/src/main/java/com/arialyy/downloadutil/core/DownloadTarget.java

@@ -1,69 +1,125 @@
 package com.arialyy.downloadutil.core;
 
+import android.content.Context;
+import android.util.Log;
+
+import com.arialyy.downloadutil.entity.DownloadEntity;
+
 /**
  * Created by lyy on 2016/8/17.
  * 下载任务调度类
  */
 public class DownloadTarget extends IDownloadTarget {
-
+    private static final    String         TAG      = "DownloadTarget";
     private static final    Object         LOCK     = new Object();
     private static volatile DownloadTarget INSTANCE = null;
+    private Context mContext;
 
     public static DownloadTarget getInstance() {
+        if (INSTANCE == null) {
+            Log.e(TAG, "请在Application中调用DownloadTarget.init()方法注册下载器");
+            return null;
+        }
+        return INSTANCE;
+    }
+
+    /**
+     * 初始化下载器
+     *
+     * @param context 全局Context
+     */
+    public static void init(Context context) {
         if (INSTANCE == null) {
             synchronized (LOCK) {
-                INSTANCE = new DownloadTarget();
+                INSTANCE = new DownloadTarget(context);
             }
         }
-        return INSTANCE;
     }
 
     private DownloadTarget() {
+        super();
+    }
 
+    private DownloadTarget(Context context) {
+        super();
+        mContext = context;
     }
 
     @Override
     public void startTask(Task task) {
-
+        if (mExecutePool.putTask(task)) {
+            task.start();
+        }
     }
 
     @Override
     public void stopTask(Task task) {
-
+        if (mExecutePool.removeTask(task)) {
+            task.stop();
+        }
     }
 
     @Override
     public void cancelTask(Task task) {
-
+        if (mExecutePool.removeTask(task)) {
+            task.cancel();
+        }
     }
 
     @Override
     public void reTryStart(Task task) {
-
+        if (!task.getDownloadUtil().isDownloading()) {
+            task.start();
+        } else {
+            Log.w(TAG, "任务没有完全停止，重试下载失败");
+        }
     }
 
     @Override
     public void createTask(String downloadUrl, String downloadPath) {
-
+        DownloadEntity entity = new DownloadEntity();
+        entity.setDownloadUrl(downloadUrl);
+        entity.setDownloadPath(downloadPath);
+        Task task = TaskFactory.getInstance().createTask(mContext, entity, mTaskHandler);
+        mCachePool.putTask(task);
     }
 
     @Override
     public Task getTask(String downloadUrl) {
-        return null;
+        Task task = mCachePool.getTask(downloadUrl);
+        if (task == null) {
+            task = mExecutePool.getTask(downloadUrl);
+        }
+        return task;
     }
 
     @Override
     public int getTaskState(String downloadUrl) {
-        return 0;
+        Task task = getTask(downloadUrl);
+        if (task == null) {
+            Log.e(TAG, "没有找到下载链接为【" + downloadUrl + "】的下载任务");
+            return -1;
+        }
+        return task.getDownloadEntity().getState();
     }
 
     @Override
     public void removeTask(String downloadUrl) {
-
+        Task task = mCachePool.getTask(downloadUrl);
+        if (task != null) {
+            Log.d(TAG, "任务删除" + (mCachePool.removeTask(task) ? "成功" : "失败"));
+        } else {
+            task = mExecutePool.getTask(downloadUrl);
+        }
+        if (task != null) {
+            Log.d(TAG, "任务删除" + (mCachePool.removeTask(task) ? "成功" : "失败"));
+        } else {
+            Log.w(TAG, "没有找到下载链接为【" + downloadUrl + "】的任务");
+        }
     }
 
     @Override
     public Task getNextTask() {
-        return null;
+        return mCachePool.pollTask();
     }
 }

downloadutil/src/main/java/com/arialyy/downloadutil/core/IDownloadTarget.java

@@ -166,6 +166,36 @@ public abstract class IDownloadTarget implements IDownloader, ITask {
                     handleFailTask(entity);
                     break;
             }
+            callback(msg.what, entity);
+        }
+
+        /**
+         * 回调
+         *
+         * @param state  状态
+         * @param entity 下载实体
+         */
+        private void callback(int state, DownloadEntity entity) {
+            if (target.mTargetListener != null) {
+                Task task = target.getTask(entity.getDownloadUrl());
+                switch (state) {
+                    case START:
+                        target.mTargetListener.onTaskStart(task);
+                        break;
+                    case STOP:
+                        target.mTargetListener.onTaskStop(task);
+                        break;
+                    case CANCEL:
+                        target.mTargetListener.onTaskCancel(task);
+                        break;
+                    case COMPLETE:
+                        target.mTargetListener.onTaskCancel(task);
+                        break;
+                    case FAIL:
+                        target.mTargetListener.onTaskFail(task);
+                        break;
+                }
+            }
         }
 
         /**

downloadutil/src/main/java/com/arialyy/downloadutil/core/Task.java

@@ -55,6 +55,13 @@ public class Task {
         }
     }
 
+    /**
+     * 获取下载工具
+     */
+    public DownLoadUtil getDownloadUtil() {
+        return util;
+    }
+
     /**
      * 取消下载
      */

downloadutil/src/main/java/com/arialyy/downloadutil/core/TaskEnum.java

@@ -0,0 +1,9 @@
+package com.arialyy.downloadutil.core;
+
+/**
+ * Created by lyy on 2016/8/18.
+ * 创建任务类型
+ */
+public enum TaskEnum {
+    ORDINARY, NO_USR_CALLBACK
+}

downloadutil/src/main/java/com/arialyy/downloadutil/core/TaskFactory.java

@@ -0,0 +1,44 @@
+package com.arialyy.downloadutil.core;
+
+import android.content.Context;
+import android.os.Handler;
+
+import com.arialyy.downloadutil.entity.DownloadEntity;
+
+/**
+ * Created by lyy on 2016/8/18.
+ * 任务工厂
+ */
+public class TaskFactory {
+    private static final String TAG = "TaskFactory";
+
+    private static final    Object      LOCK     = new Object();
+    private static volatile TaskFactory INSTANCE = null;
+
+    private TaskFactory() {
+
+    }
+
+    public static TaskFactory getInstance() {
+        if (INSTANCE == null) {
+            synchronized (LOCK) {
+                INSTANCE = new TaskFactory();
+            }
+        }
+        return INSTANCE;
+    }
+
+    /**
+     * 创建普通下载任务
+     * @param context
+     * @param entity    下载实体
+     * @param handler   {@link com.arialyy.downloadutil.core.IDownloadTarget.AutoTaskHandler}
+     * @return
+     */
+    public Task createTask(Context context, DownloadEntity entity, Handler handler) {
+        Task.Builder builder = new Task.Builder(context, entity);
+        builder.setOutHandler(handler);
+        return builder.builder();
+    }
+
+}

downloadutil/src/main/java/com/arialyy/downloadutil/core/inf/ITask.java

@@ -9,7 +9,7 @@ import com.arialyy.downloadutil.core.Task;
 public interface ITask {
 
     /**
-     * 创建一个新的下载任务
+     * 创建一个新的下载任务，创建时只是将新任务存储到缓存池
      *
      * @param downloadUrl  下载链接
      * @param downloadPath 保存路径
@@ -28,7 +28,7 @@ public interface ITask {
      * 通过下载链接搜索下载任务
      *
      * @param downloadUrl 下载链接
-     * @return {@link com.arialyy.downloadutil.entity.DownloadEntity#STATE_FAIL}
+     * @return {@code -1 ==> 错误}，{@link com.arialyy.downloadutil.entity.DownloadEntity#STATE_FAIL}
      */
     public int getTaskState(String downloadUrl);
 

downloadutil/src/main/java/com/arialyy/downloadutil/core/pool/CachePool.java

@@ -79,12 +79,7 @@ public class CachePool implements IPool {
                 return null;
             }
             String key  = Util.keyToHashKey(downloadUrl);
-            Task   task = mCacheArray.get(key);
-            if (task != null) {
-                mCacheArray.remove(key);
-                mCacheQueue.remove(task);
-            }
-            return task;
+            return mCacheArray.get(key);
         }
     }
 

downloadutil/src/main/java/com/arialyy/downloadutil/core/pool/ExecutePool.java

@@ -105,7 +105,6 @@ public class ExecutePool implements IPool {
         synchronized (LOCK) {
             Task task = mExecuteQueue.poll();
             if (task != null) {
-                task.stop();
                 String url = task.getDownloadEntity().getDownloadUrl();
                 mExecuteArray.remove(Util.keyToHashKey(url));
             }
@@ -121,13 +120,7 @@ public class ExecutePool implements IPool {
                 return null;
             }
             String key  = Util.keyToHashKey(downloadUrl);
-            Task   task = mExecuteArray.get(key);
-            if (task != null) {
-                task.stop();
-                mExecuteArray.remove(key);
-                mExecuteQueue.remove(task);
-            }
-            return task;
+            return mExecuteArray.get(key);
         }
     }
 
@@ -138,7 +131,6 @@ public class ExecutePool implements IPool {
                 Log.e(TAG, "任务不能为空");
                 return false;
             } else {
-                task.stop();
                 String key = Util.keyToHashKey(task.getDownloadEntity().getDownloadUrl());
                 mExecuteArray.remove(key);
                 return mExecuteQueue.remove(task);