安卓筆記俠

 1 public class MainActivity extends Activity implements View.OnClickListener {
 2 
 3     ....
 4 
 5     @Override
 6     public void onClick(View v) {
 7         MultiAsynctaskNetwork network = new MultiAsynctaskNetwork(networkInterface);
 8         network.execute();
 9     }
10 
11     private NetworkInterface networkInterface = new NetworkInterface() {
12         @Override
13         public void onResult(String result) {
14             mTvResult.setText(result);
15         }
16     };
17 
18 }

1 public interface NetworkInterface {
2 
3     void onResult(String result);
4 
5 }

 1 public class MultiAsynctaskNetwork extends MultiAsynctask<Void, Integer, String> {
 2 
 3     private NetworkInterface mInterface;
 4 
 5     public MultiAsynctaskNetwork(NetworkInterface networkInterface) {
 6         this.mInterface = networkInterface;
 7     }
 8 
 9     @Override
10     protected String onExecuteTask(Void... params) {
11         HttpURLConnection connection = null;
12         try {
13             URL url = new URL("http://blog.csdn.net/yanzhenjie1003");
14             connection = (HttpURLConnection) url.openConnection();
15             int responseCode = connection.getResponseCode();
16             if (responseCode == 200) {
17                 int len = 0;
18                 byte[] buffer = new byte[1024];
19                 ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
20                 InputStream inputStream = new BufferedInputStream(connection.getInputStream());
21                 while ((len = inputStream.read(buffer)) != -1) {
22                     arrayOutputStream.write(buffer, 0, len);
23                 }
24                 inputStream.close();
25                 arrayOutputStream.flush();
26                 inputStream.close();
27                 return new String(arrayOutputStream.toByteArray());
28             }
29         } catch (Exception e) {
30             e.printStackTrace();
31         } finally {
32             if (connection != null)
33                 connection.disconnect();
34         }
35         return "請求網絡失敗";
36     }
37 
38     @Override
39     public void onResult(String result) {// 拿到執行結果，直接更新UI
40         mInterface.onResult(result);
41     }
42 
43 }

  1 public abstract class MultiAsynctask<Param, Update, Result> {
  2 
  3     /**
  4      * 更新的what
  5      */
  6     private static final int WHAT_UPDATE = 0x01;
  7 
  8     /**
  9      * 發送結果的what
 10      */
 11     private static final int WHAT_RESULT = 0x02;
 12 
 13     /**
 14      * 默認的線程池
 15      */
 16     private static ExecutorService sExecutorService;
 17 
 18     /**
 19      * 默認并發大小
 20      */
 21     private static final int DEFAULT_POOL_SIZE = 5;
 22 
 23     /**
 24      * 發送結果的Handler
 25      */
 26     private static Handler sHandler;
 27 
 28     /**
 29      * Handler的鎖
 30      */
 31     private static Object HANDLER_LOCK = new Object();
 32 
 33     /**
 34      * 本地異步任務的執行器
 35      */
 36     private ExecutorService mExecutorService = null;
 37 
 38     public MultiAsynctask() {
 39         this(getDufaultExecutor());
 40     }
 41 
 42     public MultiAsynctask(ExecutorService executorService) {
 43         mExecutorService = executorService;
 44     }
 45 
 46     /**
 47      * 拿到默認的線程池
 48      * 
 49      * @return
 50      */
 51     private static ExecutorService getDufaultExecutor() {
 52         synchronized (MultiAsynctask.class) {
 53             if (sExecutorService == null)
 54                 sExecutorService = Executors.newFixedThreadPool(DEFAULT_POOL_SIZE);
 55             return sExecutorService;
 56         }
 57     }
 58 
 59     /**
 60      * 設置默認的線程池
 61      * 
 62      * @param executorService
 63      */
 64     public static void setDefaultExecutor(ExecutorService executorService) {
 65         synchronized (MultiAsynctask.class) {
 66             sExecutorService = executorService;
 67         }
 68     }
 69 
 70     public static Handler getDefaultPoster() {
 71         synchronized (HANDLER_LOCK) {
 72             if (sHandler == null)
 73                 sHandler = new Poster();
 74             return sHandler;
 75         }
 76     }
 77 
 78     /**
 79      * 開始執行任務
 80      * 
 81      * @param params
 82      */
 83     public final void execute(Param... params) {
 84         mExecutorService.execute(new Tasker(params));
 85     }
 86 
 87     protected abstract Result onExecuteTask(Param... params);
 88 
 89     /**
 90      * 發送進度更新到主線程
 91      * 
 92      * @param update
 93      */
 94     public final void onPostUpdate(Update update) {
 95         Message.obtain();
 96         Message message = getDefaultPoster().obtainMessage();
 97         message.what = WHAT_UPDATE;
 98         message.obj = new Messager<Param, Update, Result>(this, update, null);
 99         message.sendToTarget();
100     }
101 
102     /**
103      * 當返回進度更新的時候
104      * 
105      * @param update
106      */
107     protected void onUpdate(Update update) {
108     }
109 
110     /**
111      * 發送進度執行結果到主線程
112      * 
113      * @param result
114      */
115     public final void onPostResult(Result result) {
116         Message.obtain();
117         Message message = getDefaultPoster().obtainMessage();
118         message.what = WHAT_RESULT;
119         message.obj = new Messager<Param, Update, Result>(this, null, result);
120         message.sendToTarget();
121     }
122 
123     /**
124      * 當返回執行結果的時候
125      * 
126      * @param result
127      */
128     protected void onResult(Result result) {
129 
130     }
131 
132     private static class Messager<Param, Update, Result> {
133 
134         private final MultiAsynctask<Param, Update, Result> asynctask;
135 
136         private final Update update;
137 
138         private final Result result;
139 
140         public Messager(MultiAsynctask<Param, Update, Result> asynctask, Update update, Result result) {
141             this.asynctask = asynctask;
142             this.update = update;
143             this.result = result;
144         }
145 
146         /**
147          * 調用當前MultiAsynctask的主線程更新方法
148          */
149         public void onUpdate() {
150             asynctask.onUpdate(update);
151         }
152 
153         /**
154          * 調用當前MultiAsynctask的主線程結果方法
155          */
156         public void onResult() {
157             asynctask.onResult(result);
158         }
159 
160     }
161 
162     /**
163      * <p>
164      * 線程間通信使者
165      * </p>
166      * Created in Mar 27, 2016 10:00:03 PM.
167      * 
168      * @author Yolanda;
169      */
170     private static class Poster extends Handler {
171 
172         public Poster() {
173             super(Looper.getMainLooper());
174         }
175 
176         @Override
177         public void handleMessage(Message msg) {
178             Messager<?, ?, ?> messageer = (Messager<?, ?, ?>) msg.obj;
179             if (msg.what == WHAT_RESULT) {
180                 messageer.onResult();
181             } else if (msg.what == WHAT_UPDATE) {
182                 messageer.onUpdate();
183             }
184         }
185     }
186 
187     /**
188      * <p>
189      * 任務執行器
190      * </p>
191      * Created in Mar 27, 2016 10:03:44 PM.
192      * 
193      * @author Yolanda;
194      */
195     private class Tasker implements Runnable {
196 
197         private Param[] params;
198 
199         public Tasker(Param... params) {
200             this.params = params;
201         }
202 
203         @Override
204         public void run() {
205             Result result = onExecuteTask(params);
206             onPostResult(result);
207         }
208     }
209 
210 }