NoHttp封装--07 自定义异步任务框架

MainActivity：

 public class MainActivity extends Activity implements View.OnClickListener {

     ....

     @Override
     public void onClick(View v) {
         MultiAsynctaskNetwork network = new MultiAsynctaskNetwork(networkInterface);
         network.execute();
     }

     private NetworkInterface networkInterface = new NetworkInterface() {
         @Override
         public void onResult(String result) {
             mTvResult.setText(result);
         }
     };

 }

NetworkInterface：

 public interface NetworkInterface {

     void onResult(String result);

 }

MultiAsynctaskNetwork：

 public class MultiAsynctaskNetwork extends MultiAsynctask<Void, Integer, String> {

     private NetworkInterface mInterface;

     public MultiAsynctaskNetwork(NetworkInterface networkInterface) {
         this.mInterface = networkInterface;
     }

     @Override
     protected String onExecuteTask(Void... params) {
         HttpURLConnection connection = null;
         try {
             URL url = new URL("http://blog.csdn.net/yanzhenjie1003");
             connection = (HttpURLConnection) url.openConnection();
             int responseCode = connection.getResponseCode();
             if (responseCode == ) {
                 int len = ;
                 byte[] buffer = new byte[];
                 ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
                 InputStream inputStream = new BufferedInputStream(connection.getInputStream());
                 while ((len = inputStream.read(buffer)) != -) {
                     arrayOutputStream.write(buffer, , len);
                 }
                 inputStream.close();
                 arrayOutputStream.flush();
                 inputStream.close();
                 return new String(arrayOutputStream.toByteArray());
             }
         } catch (Exception e) {
             e.printStackTrace();
         } finally {
             if (connection != null)
                 connection.disconnect();
         }
         return "请求网络失败";
     }

     @Override
     public void onResult(String result) {// 拿到执行结果，直接更新UI
         mInterface.onResult(result);
     }

 }

核心类MultiAsynctask：

 public abstract class MultiAsynctask<Param, Update, Result> {

     /**
      * 更新的what
      */
     private static final int WHAT_UPDATE = 0x01;

     /**
      * 发送结果的what
      */
     private static final int WHAT_RESULT = 0x02;

     /**
      * 默认的线程池
      */
     private static ExecutorService sExecutorService;

     /**
      * 默认并发大小
      */
     private static final int DEFAULT_POOL_SIZE = ;

     /**
      * 发送结果的Handler
      */
     private static Handler sHandler;

     /**
      * Handler的锁
      */
     private static Object HANDLER_LOCK = new Object();

     /**
      * 本地异步任务的执行器
      */
     private ExecutorService mExecutorService = null;

     public MultiAsynctask() {
         this(getDufaultExecutor());
     }

     public MultiAsynctask(ExecutorService executorService) {
         mExecutorService = executorService;
     }

     /**
      * 拿到默认的线程池
      *
      * @return
      */
     private static ExecutorService getDufaultExecutor() {
         synchronized (MultiAsynctask.class) {
             if (sExecutorService == null)
                 sExecutorService = Executors.newFixedThreadPool(DEFAULT_POOL_SIZE);
             return sExecutorService;
         }
     }

     /**
      * 设置默认的线程池
      *
      * @param executorService
      */
     public static void setDefaultExecutor(ExecutorService executorService) {
         synchronized (MultiAsynctask.class) {
             sExecutorService = executorService;
         }
     }

     public static Handler getDefaultPoster() {
         synchronized (HANDLER_LOCK) {
             if (sHandler == null)
                 sHandler = new Poster();
             return sHandler;
         }
     }

     /**
      * 开始执行任务
      *
      * @param params
      */
     public final void execute(Param... params) {
         mExecutorService.execute(new Tasker(params));
     }

     protected abstract Result onExecuteTask(Param... params);

     /**
      * 发送进度更新到主线程
      *
      * @param update
      */
     public final void onPostUpdate(Update update) {
         Message.obtain();
         Message message = getDefaultPoster().obtainMessage();
         message.what = WHAT_UPDATE;
         message.obj = new Messager<Param, Update, Result>(this, update, null);
         message.sendToTarget();
     }

     /**
      * 当返回进度更新的时候
      *
      * @param update
      */
     protected void onUpdate(Update update) {
     }

     /**
      * 发送进度执行结果到主线程
      *
      * @param result
      */
     public final void onPostResult(Result result) {
         Message.obtain();
         Message message = getDefaultPoster().obtainMessage();
         message.what = WHAT_RESULT;
         message.obj = new Messager<Param, Update, Result>(this, null, result);
         message.sendToTarget();
     }

     /**
      * 当返回执行结果的时候
      *
      * @param result
      */
     protected void onResult(Result result) {

     }

     private static class Messager<Param, Update, Result> {

         private final MultiAsynctask<Param, Update, Result> asynctask;

         private final Update update;

         private final Result result;

         public Messager(MultiAsynctask<Param, Update, Result> asynctask, Update update, Result result) {
             this.asynctask = asynctask;
             this.update = update;
             this.result = result;
         }

         /**
          * 调用当前MultiAsynctask的主线程更新方法
          */
         public void onUpdate() {
             asynctask.onUpdate(update);
         }

         /**
          * 调用当前MultiAsynctask的主线程结果方法
          */
         public void onResult() {
             asynctask.onResult(result);
         }

     }

     /**
      * <p>
      * 线程间通信使者
      * </p>
      * Created in Mar 27, 2016 10:00:03 PM.
      *
      * @author Yolanda;
      */
     private static class Poster extends Handler {

         public Poster() {
             super(Looper.getMainLooper());
         }

         @Override
         public void handleMessage(Message msg) {
             Messager<?, ?, ?> messageer = (Messager<?, ?, ?>) msg.obj;
             if (msg.what == WHAT_RESULT) {
                 messageer.onResult();
             } else if (msg.what == WHAT_UPDATE) {
                 messageer.onUpdate();
             }
         }
     }

     /**
      * <p>
      * 任务执行器
      * </p>
      * Created in Mar 27, 2016 10:03:44 PM.
      *
      * @author Yolanda;
      */
     private class Tasker implements Runnable {

         private Param[] params;

         public Tasker(Param... params) {
             this.params = params;
         }

         @Override
         public void run() {
             Result result = onExecuteTask(params);
             onPostResult(result);
         }
     }

 }