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编写Android app更新模块遇到的问题分析与总结

android 
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前不久接到个任务，在我们的app里面添加更新模块，在之前的版本中，我们的更新都是直接通过浏览器下载apk包来安装更新的，我想各位很大一部分应用的更新方法都是这样，因为它简单、方便，但是他也有许多不好的地方，比如需要用户跳转到浏览器页面、下载不可控、网络不好的情况的下失败无法续传，退出浏览器就无法接着下了等。。

 

     于是我们这个更新模块的需求就来了

1.下载后台进行，退出我们应用下载任务依旧能继续执行操作

2.下载文件支持断点续传

3.下载任务支持没有安装sdcard时也可下载更新

4.notify栏提示操作

 

   对几个需求稍作分析，解决方法如下：

1.下载更新的线程放到一个service中去，service的好处是不易被系统回收，而且也容易操作。我们需要先在AndroidMainfest.xml文件中去注册这个service

 

[html] view plaincopyprint?
  1. <service android:name="com.dj.app.UpdateService"/>  
<service android:name="com.dj.app.UpdateService"/>


2.断点续传，请求头中有个重要的参数range，代表的意思的我要取的数据的范围，这个需要服务器支持，默认情况都是支持的。我的思路是下载前先获取文件包大小，然后检查是否已经有下载好的部分了，没有就从头开始，有就接着下。

 

 

[java] view plaincopyprint?
  1. request.addHeader("Range", "bytes=" + downLength + "-");  
request.addHeader("Range", "bytes=" + downLength + "-");

 

为了支持断点续传，我将下载好的文件版本号、文件长度都以prefrence的形似保存下来，下次更新如果还是这个版本就接着下，如果又有更新的了就删掉重下。

 

[java] view plaincopyprint?
  1. private void checkTemFile() {  
  2.             existTemFileVersionCode = preferences().getInt(  
  3.                     UPDATE_FILE_VERSIONCODE, 0);  
  4.             if (newestVersionCode == existTemFileVersionCode  
  5.                     || newestVersionCode == TEST) {  
  6.                 File temFile = new File(context.getFilesDir(),  
  7.                         Integer.valueOf(newestVersionCode) + ".apk");  
  8.                 if (!temFile.exists()) {  
  9.                     saveLogFile(newestVersionCode, 0);  
  10.                 }  
  11.             } else {  
  12.                 deleteApkFile(existTemFileVersionCode);  
  13.                 saveLogFile(newestVersionCode, 0);  
  14.             }  
  15. }  
private void checkTemFile() {
			existTemFileVersionCode = preferences().getInt(
					UPDATE_FILE_VERSIONCODE, 0);
			if (newestVersionCode == existTemFileVersionCode
					|| newestVersionCode == TEST) {
				File temFile = new File(context.getFilesDir(),
						Integer.valueOf(newestVersionCode) + ".apk");
				if (!temFile.exists()) {
					saveLogFile(newestVersionCode, 0);
				}
			} else {
				deleteApkFile(existTemFileVersionCode);
				saveLogFile(newestVersionCode, 0);
			}
}


 

3.无sdcard时也能下载，那只能将apk包下载到系统内存中

 

[java] view plaincopyprint?
  1. context.getFilesDir();  
context.getFilesDir();

这样创建的文件在/data/data/应用包名/files

 

伪代码：

 

[java] view plaincopyprint?
  1. if (downLength > 0) {//接着上次的下载   
  2.   
  3.     outStream = context.openFileOutput(Integer.valueOf(newestVersionCode) + ".apk",  
  4.             Context.MODE_APPEND+ Context.MODE_WORLD_READABLE);  
  5.   
  6. } else {//从头开始下载   
  7.       outStream = context.openFileOutput(Integer.valueOf(newestVersionCode) + ".apk",Context.MODE_WORLD_READABLE);  
  8. }  
if (downLength > 0) {//接着上次的下载

	outStream = context.openFileOutput(Integer.valueOf(newestVersionCode) + ".apk",
			Context.MODE_APPEND+ Context.MODE_WORLD_READABLE);

} else {//从头开始下载
      outStream = context.openFileOutput(Integer.valueOf(newestVersionCode) + ".apk",Context.MODE_WORLD_READABLE);
}

 

 

 

 

 

4.notify，我设定了一个更新notify的线程专门去观察下载线程的进度，每一分钟更新一次notify中的进度条。

 

[java] view plaincopyprint?
  1. new Thread() {  
  2.                 public void run() {  
  3.                     try {  
  4.                         boolean notFinish = true;  
  5.                         while (notFinish) {  
  6.                             Thread.sleep(1000);  
  7.                             notFinish = false;  
  8.                             if (downloadThread == null) {  
  9.                                 break;  
  10.                             }  
  11.                             if (!downloadThread.downFinish) {  
  12.                                 notFinish = true;  
  13.                             }  
  14.                             downloadThread.showNotification();  
  15.                         }  
  16.                     } catch (Exception e) {  
  17.                         e.printStackTrace();  
  18.                     } finally {  
  19.                         stopSelf();  
  20.                     }  
  21.                 };  
  22.             }.start();  
new Thread() {
				public void run() {
					try {
						boolean notFinish = true;
						while (notFinish) {
							Thread.sleep(1000);
							notFinish = false;
							if (downloadThread == null) {
								break;
							}
							if (!downloadThread.downFinish) {
								notFinish = true;
							}
							downloadThread.showNotification();
						}
					} catch (Exception e) {
						e.printStackTrace();
					} finally {
						stopSelf();
					}
				};
			}.start();

 

 

downloadThread就是我的下载线程了因为要对不同进度时有不同的控制，这个可以通过notification.contentIntent来进行设定，比如100%的时候，我想要用户点击通知栏，即可进行安装，则应该这样做

 

 

 

 

[java] view plaincopyprint?
  1. notification.tickerText = "下载完成";  
  2.                     notification.when = System.currentTimeMillis();  
  3.                     Intent notificationIntent = new Intent();  
  4.                     notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
  5.                     notificationIntent  
  6.                             .setAction(android.content.Intent.ACTION_VIEW);  
  7.                     String type = "application/vnd.android.package-archive";  
  8.                     notificationIntent.setDataAndType(  
  9.                             Uri.parse("file:///data/data/"  
  10.                                     + context.getPackageName()  
  11.                                     + "/files/"  
  12.                                     + (Integer.valueOf(newestVersionCode)  
  13.                                             .toString()) + ".apk"), type);  
  14.                     notification.contentView = rv;  
  15.                     notification.flags = Notification.FLAG_AUTO_CANCEL;  
  16.                     notification.contentView  
  17.                             .setProgressBar(  
  18.                                     R.id.update_notification_progressbar, 100,  
  19.                                     p, false);  
  20.                     notification.contentView.setTextViewText(  
  21.                             R.id.update_notification_progresstext, p + "%");  
  22.                     notification.contentView.setTextViewText(  
  23.                             R.id.update_notification_title, "下载完成，点击安装");  
  24.                     PendingIntent contentIntent = PendingIntent.getActivity(  
  25.                             context, 0, notificationIntent, 0);  
  26.                     notification.contentIntent = contentIntent;  
notification.tickerText = "下载完成";
					notification.when = System.currentTimeMillis();
					Intent notificationIntent = new Intent();
					notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
					notificationIntent
							.setAction(android.content.Intent.ACTION_VIEW);
					String type = "application/vnd.android.package-archive";
					notificationIntent.setDataAndType(
							Uri.parse("file:///data/data/"
									+ context.getPackageName()
									+ "/files/"
									+ (Integer.valueOf(newestVersionCode)
											.toString()) + ".apk"), type);
					notification.contentView = rv;
					notification.flags = Notification.FLAG_AUTO_CANCEL;
					notification.contentView
							.setProgressBar(
									R.id.update_notification_progressbar, 100,
									p, false);
					notification.contentView.setTextViewText(
							R.id.update_notification_progresstext, p + "%");
					notification.contentView.setTextViewText(
							R.id.update_notification_title, "下载完成，点击安装");
					PendingIntent contentIntent = PendingIntent.getActivity(
							context, 0, notificationIntent, 0);
					notification.contentIntent = contentIntent;




 




 


下面我将下载线程完整的代码贴出来 


 







[java] view plaincopyprint?





    

  1. class DownloadThread extends Thread {  
    2. 

  2. 
    private static final String UPDATE_FILE_VERSIONCODE = "updateTemFileVersionCode";  

    3. 

  3. 
    private static final String UPDATE_FILE_LENGTH = "updateTemFileLength";  

    4. 

  4. 
    private static final String TEST_UPDATE_FILE_LENGTH = "testupdatefilelength";  

    5. 

  5. 
    private static final int BUFFER_SIZE = 1024;  

    6. 

  6. 
    private static final int NETWORK_CONNECTION_TIMEOUT = 15000;  

    7. 

  7. 
    private static final int NETWORK_SO_TIMEOUT = 15000;  

    8. 

  8. 
    private int newestVersionCode, existTemFileVersionCode;  

    9. 

  9. 
    private String downUrl;  

    10. 

  10. 
    private int fileLength = Integer.MAX_VALUE;  

    11. 

  11. 
    private int downLength;  

    12. 

  12. 
    private boolean downFinish;  

    13. 

  13.   
    14. 

  14. 
    private static final int CHECK_FAILED = -1;  

    15. 

  15. 
    private static final int CHECK_SUCCESS = 0;  

    16. 

  16. 
    private static final int CHECK_RUNNING = 1;  

    17. 

  17. 
    private int checkStatus;  

    18. 

  18. 
    private boolean isChecking = false;  

    19. 

  19.   
    20. 

  20. 
    private Context context;  

    21. 

  21. 
    private boolean isPercentZeroRunning = false;  

    22. 

  22. 
    private boolean stop;  

    23. 

  23. 
    private Object block = new Object();  

    24. 

  24. 
    private boolean receiverRegistered = false;  

    25. 

  25.   
    26. 

  26. 
    private NotificationManager mNM;  

    27. 

  27. 
    private RemoteViews rv;  

    28. 

  28.   
    29. 

  29. 
    public DownloadThread(Context context, String downUrl, int versionCode) {  

    30. 

  30. 
        super("DownloadThread");  

    31. 

  31. 
        this.downUrl = downUrl;  

    32. 

  32. 
        this.newestVersionCode = versionCode;  

    33. 

  33. 
        this.context = context;  

    34. 

  34. 
        this.mNM = (NotificationManager) context  

    35. 

  35.                 .getSystemService(Context.NOTIFICATION_SERVICE);  
    36. 

  36. 
        this.rv = new RemoteViews(context.getPackageName(), R.layout.notify);  

    37. 

  37. 
        this.downFinish = false;  

    38. 

  38.     }  
    39. 

  39.   
    40. 

  40. 
    private void checkTemFile() {  

    41. 

  41.         existTemFileVersionCode = preferences().getInt(  
    42. 

  42. 
                UPDATE_FILE_VERSIONCODE, 0);  

    43. 

  43. 
        if (newestVersionCode == existTemFileVersionCode  

    44. 

  44.                 || newestVersionCode == TEST) {  
    45. 

  45. 
            File temFile = new File(context.getFilesDir(),  

    46. 

  46. 
                    Integer.valueOf(newestVersionCode) + ".apk");  

    47. 

  47. 
            if (!temFile.exists()) {  

    48. 

  48. 
                saveLogFile(newestVersionCode, 0);  

    49. 

  49.             }  
    50. 

  50. 
        } else {  

    51. 

  51.             deleteApkFile(existTemFileVersionCode);  
    52. 

  52. 
            saveLogFile(newestVersionCode, 0);  

    53. 

  53.         }  
    54. 

  54.     }  
    55. 

  55.   
    56. 

  56. 
    private void deleteApkFile(int existVersionCode) {  

    57. 

  57. 
        File temFile = new File(context.getFilesDir(),  

    58. 

  58. 
                Integer.valueOf(existVersionCode) + ".apk");  

    59. 

  59. 
        if (temFile.exists()) {  

    60. 

  60.             temFile.delete();  
    61. 

  61.         }  
    62. 

  62.     }  
    63. 

  63.   
    64. 

  64. 
    private SharedPreferences preferences() {  

    65. 

  65. 
        return context.getSharedPreferences(context.getPackageName(),  

    66. 

  66.                 Context.MODE_WORLD_READABLE | Context.MODE_WORLD_WRITEABLE);  
    67. 

  67.     }  
    68. 

  68.   
    69. 

  69. 
    private void saveLogFile(int versionCode, int downloadLength) {  

    70. 

  70.         SharedPreferences.Editor edit = preferences().edit();  
    71. 

  71. 
        if (versionCode == TEST) {  

    72. 

  72.             edit.putInt(TEST_UPDATE_FILE_LENGTH, downloadLength);  
    73. 

  73. 
        } else {  

    74. 

  74.             edit.putInt(UPDATE_FILE_VERSIONCODE, versionCode);  
    75. 

  75.             edit.putInt(UPDATE_FILE_LENGTH, downloadLength);  
    76. 

  76.         }  
    77. 

  77.         edit.commit();  
    78. 

  78.     }  
    79. 

  79.   
    80. 

  80. 
    @Override  

    81. 

  81. 
    public void run() {  

    82. 

  82.         checkTemFile();  
    83. 

  83. 
        this.stop = false;  

    84. 

  84. 
        while (!downFinish) {  

    85. 

  85. 
            Log.i(TAG, "download thread start : while()");  

    86. 

  86. 
            if (newestVersionCode == TEST) {  

    87. 

  87.                 downLength = preferences().getInt(TEST_UPDATE_FILE_LENGTH,  
    88. 

  88. 
                        0);  

    89. 

  89. 
            } else {  

    90. 

  90. 
                downLength = preferences().getInt(UPDATE_FILE_LENGTH, 0);  

    91. 

  91.             }  
    92. 

  92.   
    93. 

  93. 
            InputStream is = null;  

    94. 

  94. 
            FileOutputStream outStream = null;  

    95. 

  95. 
            try {  

    96. 

  96. 
                // check the network   

    97. 

  97.                 ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);  
    98. 

  98.                 NetworkInfo ni = cm.getActiveNetworkInfo();  
    99. 

  99. 
                boolean con = ni == null ? false : ni  

    100. 

  100.                         .isConnectedOrConnecting();  
    101. 

  101. 
                synchronized (block) {  

    102. 

  102. 
                    if (!con) {  

    103. 

  103.                         context.registerReceiver(  
    104. 

  104.                                 receiver,  
    105. 

  105. 
                                new IntentFilter(  

    106. 

  106.                                         ConnectivityManager.CONNECTIVITY_ACTION));  
    107. 

  107. 
                        receiverRegistered = true;  

    108. 

  108. 
                        try {  

    109. 

  109. 
                            Log.i(TAG, "network is not ok : block.wait()");  

    110. 

  110.                             block.wait();  
    111. 

  111. 
                        } catch (InterruptedException e1) {  

    112. 

  112.                         }  
    113. 

  113.                     }  
    114. 

  114.                 }  
    115. 

  115.   
    116. 

  116. 
                if (fileLength == Integer.MAX_VALUE) {  

    117. 

  117. 
                    URL url = new URL(downUrl);  

    118. 

  118.                     HttpURLConnection conn = (HttpURLConnection) url  
    119. 

  119.                             .openConnection();  
    120. 

  120. 
                    if (conn.getResponseCode() / 100 == 2  

    121. 

  121. 
                            && conn.getContentLength() != -1) {  

    122. 

  122.                         fileLength = conn.getContentLength();  
    123. 

  123. 
                        Log.i(TAG, "getContentLength == " + fileLength);  

    124. 

  124. 
                    } else {  

    125. 

  125. 
                        Thread.sleep(5000);  

    126. 

  126. 
                        Log.i(TAG, "getContentLength failed : retry in 5 second later");  

    127. 

  127. 
                        continue;  

    128. 

  128.                     }  
    129. 

  129.                 }  
    130. 

  130.   
    131. 

  131. 
                HttpClient httpClient = new DefaultHttpClient();  

    132. 

  132. 
                HttpGet request = new HttpGet(downUrl);  

    133. 

  133. 
                request.addHeader("Range", "bytes=" + downLength + "-");  

    134. 

  134.   
    135. 

  135. 
                if (downLength < fileLength) {  

    136. 

  136.                     HttpHost proxy = HttpBase.globalProxy();  
    137. 

  137.                     HttpParams httpParams = request.getParams();  
    138. 

  138.                     HttpConnectionParams.setConnectionTimeout(httpParams,  
    139. 

  139.                             NETWORK_CONNECTION_TIMEOUT);  
    140. 

  140.                     HttpConnectionParams.setSoTimeout(httpParams,  
    141. 

  141.                             NETWORK_SO_TIMEOUT);  
    142. 

  142.                     ConnRouteParams.setDefaultProxy(request.getParams(),  
    143. 

  143.                             proxy);  
    144. 

  144.   
    145. 

  145.                     HttpResponse response = httpClient.execute(request);  
    146. 

  146. 
                    Log.i(TAG, "getContent's response status == "  

    147. 

  147.                             + response.getStatusLine().getStatusCode());  
    148. 

  148. 
                    if (response.getStatusLine().getStatusCode() / 100 != 2) {  

    149. 

  149. 
                        continue;  

    150. 

  150.                     }  
    151. 

  151.                     HttpEntity entity = response.getEntity();  
    152. 

  152.                     is = entity.getContent();  
    153. 

  153. 
                    byte[] buffer = new byte[BUFFER_SIZE];  

    154. 

  154. 
                    int offset = 0;  

    155. 

  155.   
    156. 

  156. 
                    if (downLength > 0) {  

    157. 

  157.                         outStream = context  
    158. 

  158.                                 .openFileOutput(  
    159. 

  159.                                         Integer.valueOf(newestVersionCode)  
    160. 

  160. 
                                                + ".apk",  

    161. 

  161.                                         Context.MODE_APPEND  
    162. 

  162.                                                 + Context.MODE_WORLD_READABLE);  
    163. 

  163.   
    164. 

  164. 
                    } else {  

    165. 

  165.                         outStream = context  
    166. 

  166.                                 .openFileOutput(  
    167. 

  167.                                         Integer.valueOf(newestVersionCode)  
    168. 

  168. 
                                                + ".apk",  

    169. 

  169.                                         Context.MODE_WORLD_READABLE);  
    170. 

  170.                     }  
    171. 

  171.   
    172. 

  172. 
                    while ((offset = is.read(buffer, 0, BUFFER_SIZE)) != -1  

    173. 

  173.                             && !stop) {  
    174. 

  174. 
                        outStream.write(buffer, 0, offset);  

    175. 

  175.                         downLength += offset;  
    176. 

  176.                     }  
    177. 

  177.                 }  
    178. 

  178. 
                if (downLength == fileLength) {  

    179. 

  179. 
                    File apkFile = new File(context.getFilesDir(),  

    180. 

  180. 
                            Integer.valueOf(newestVersionCode) + ".apk");  

    181. 

  181. 
                    if (isApkFileOK(apkFile)) {  

    182. 

  182.                         checkStatus = CHECK_SUCCESS;  
    183. 

  183. 
                    } else {  

    184. 

  184.                         deleteApkFile(newestVersionCode);  
    185. 

  185. 
                        saveLogFile(existTemFileVersionCode, 0);  

    186. 

  186.                         checkStatus = CHECK_FAILED;  
    187. 

  187.                     }  
    188. 

  188. 
                    this.downFinish = true;  

    189. 

  189.                 }  
    190. 

  190.   
    191. 

  191. 
            } catch (Exception e) {  

    192. 

  192. 
            } finally {  

    193. 

  193.                 saveLogFile(newestVersionCode, downLength);  
    194. 

  194. 
                if (receiverRegistered) {  

    195. 

  195.                     context.unregisterReceiver(receiver);  
    196. 

  196. 
                    receiverRegistered = false;  

    197. 

  197.                 }  
    198. 

  198.   
    199. 

  199. 
                if (stop || downFinish) {  

    200. 

  200. 
                    break;  

    201. 

  201.                 }  
    202. 

  202. 
                try {  

    203. 

  203. 
                    if (outStream != null) {  

    204. 

  204.                         outStream.close();  
    205. 

  205.                     }  
    206. 

  206. 
                    if (is != null) {  

    207. 

  207.                         is.close();  
    208. 

  208.                     }  
    209. 

  209. 
                } catch (IOException e) {  

    210. 

  210.                 }  
    211. 

  211.             }  
    212. 

  212.         }  
    213. 

  213.   
    214. 

  214.     }  
    215. 

  215.   
    216. 

  216. 
    @Override  

    217. 

  217. 
    public void interrupt() {  

    218. 

  218. 
        synchronized (block) {  

    219. 

  219. 
            Log.i(TAG, "block.notify()");  

    220. 

  220.             block.notify();  
    221. 

  221.         }  
    222. 

  222.     }  
    223. 

  223.   
    224. 

  224. 
    private void cancel() {  

    225. 

  225. 
        stop = true;  

    226. 

  226.         mNM.cancel(MOOD_NOTIFICATIONS);  
    227. 

  227.     }  
    228. 

  228.   
    229. 

  229. 
    private boolean isApkFileOK(File file) {  

    230. 

  230.         checkStatus = CHECK_RUNNING;  
    231. 

  231. 
        // first check the file header   

    232. 

  232. 
        /*if (file.isDirectory() || !file.canRead() || file.length() < 4) { 
    233. 

  233.             return false; 
    234. 

  234.         } 
    235. 

  235.         DataInputStream in = null; 
    236. 

  236.         try { 
    237. 

  237.             in = new DataInputStream(new BufferedInputStream( 
    238. 

  238.                     new FileInputStream(file))); 
    239. 

  239.             int test = in.readInt(); 
    240. 

  240.             if (test != 0x504b0304) 
    241. 

  241.                 return false; 
    242. 

  242.         } catch (IOException e) { 
    243. 

  243.             return false; 
    244. 

  244.         } finally { 
    245. 

  245.             try { 
    246. 

  246.                 in.close(); 
    247. 

  247.             } catch (IOException e) { 
    248. 

  248.             } 
    249. 

  249.         }*/  
    250. 

  250.   
    251. 

  251. 
        // second unZip file to check(without saving)   

    252. 

  252. 
        boolean result = unzip(file);  

    253. 

  253. 
        isChecking = false;  

    254. 

  254. 
        return result;  

    255. 

  255.     }  
    256. 

  256.   
    257. 

  257. 
    private boolean unzip(File unZipFile) {  

    258. 

  258. 
        boolean succeed = true;  

    259. 

  259. 
        ZipInputStream zin = null;  

    260. 

  260. 
        ZipEntry entry = null;  

    261. 

  261. 
        try {  

    262. 

  262. 
            zin = new ZipInputStream(new FileInputStream(unZipFile));  

    263. 

  263. 
            boolean first = true;  

    264. 

  264. 
            while (true) {  

    265. 

  265. 
                if ((entry = zin.getNextEntry()) == null) {  

    266. 

  266. 
                    if (first)  

    267. 

  267. 
                        succeed = false;  

    268. 

  268. 
                    break;  

    269. 

  269.                 }  
    270. 

  270. 
                first = false;  

    271. 

  271. 
                if (entry.isDirectory()) {  

    272. 

  272.                     zin.closeEntry();  
    273. 

  273. 
                    continue;  

    274. 

  274.                 }  
    275. 

  275. 
                if (!entry.isDirectory()) {  

    276. 

  276. 
                    byte[] b = new byte[1024];  

    277. 

  277. 
                    @SuppressWarnings("unused")  

    278. 

  278. 
                    int len = 0;  

    279. 

  279. 
                    while ((len = zin.read(b)) != -1) {  

    280. 

  280.                     }  
    281. 

  281.                     zin.closeEntry();  
    282. 

  282.                 }  
    283. 

  283.             }  
    284. 

  284. 
        } catch (IOException e) {  

    285. 

  285. 
            succeed = false;  

    286. 

  286. 
        } finally {  

    287. 

  287. 
            if (null != zin) {  

    288. 

  288. 
                try {  

    289. 

  289.                     zin.close();  
    290. 

  290. 
                } catch (IOException e) {  

    291. 

  291.                 }  
    292. 

  292.             }  
    293. 

  293.         }  
    294. 

  294. 
        return succeed;  

    295. 

  295.     }  
    296. 

  296.   
    297. 

  297. 
    public void showNotification() {  

    298. 

  298. 
        float result = (float) downLength / (float) fileLength;  

    299. 

  299. 
        int p = (int) (result * 100);  

    300. 

  300. 
        if (p == 0 && isPercentZeroRunning || p == 100 && isChecking) {  

    301. 

  301. 
            return;  

    302. 

  302. 
        } else if (p != 0) {  

    303. 

  303. 
            isPercentZeroRunning = false;  

    304. 

  304.         }  
    305. 

  305. 
        Notification notification = new Notification(R.drawable.icon, null,  

    306. 

  306. 
                0);  

    307. 

  307.   
    308. 

  308. 
        if (p == 100) {  

    309. 

  309. 
            if (checkStatus == CHECK_RUNNING) {  

    310. 

  310. 
                notification.tickerText = "开始检查下载文件";  

    311. 

  311.                 notification.when = System.currentTimeMillis();  
    312. 

  312.                 notification.flags = notification.flags  
    313. 

  313.                         | Notification.FLAG_ONGOING_EVENT  
    314. 

  314.                         | Notification.FLAG_NO_CLEAR;  
    315. 

  315.                 notification.contentView = rv;  
    316. 

  316.                 notification.contentView.setProgressBar(  
    317. 

  317. 
                        R.id.update_notification_progressbar, 100, p, true);  

    318. 

  318.                 notification.contentView.setTextViewText(  
    319. 

  319. 
                        R.id.update_notification_title, "正在检查下载文件...");  

    320. 

  320.                 PendingIntent contentIntent = PendingIntent.getActivity(  
    321. 

  321. 
                        context, 0, null, 0);  

    322. 

  322.                 notification.contentIntent = contentIntent;  
    323. 

  323. 
                isChecking = true;  

    324. 

  324. 
            } else if (checkStatus == CHECK_FAILED) {  

    325. 

  325. 
                notification.tickerText = "文件验证失败！";  

    326. 

  326.                 notification.when = System.currentTimeMillis();  
    327. 

  327.                 notification.flags = notification.flags  
    328. 

  328.                         | Notification.FLAG_AUTO_CANCEL;  
    329. 

  329.                 notification.contentView = rv;  
    330. 

  330.                 notification.contentView.setProgressBar(  
    331. 

  331. 
                        R.id.update_notification_progressbar, 100, p, false);  

    332. 

  332.                 notification.contentView.setTextViewText(  
    333. 

  333. 
                        R.id.update_notification_title, "文件验证失败，请重新下载");  

    334. 

  334. 
                Intent notificationIntent = new Intent(context,  

    335. 

  335. 
                        UpdateService.class);  

    336. 

  336.                 notificationIntent.setAction(ACTION_STOP);  
    337. 

  337.                 PendingIntent contentIntent = PendingIntent.getService(  
    338. 

  338. 
                        context, 0, notificationIntent, 0);  

    339. 

  339.                 notification.contentIntent = contentIntent;  
    340. 

  340. 
            } else {  

    341. 

  341. 
                notification.tickerText = "下载完成";  

    342. 

  342.                 notification.when = System.currentTimeMillis();  
    343. 

  343. 
                Intent notificationIntent = new Intent();  

    344. 

  344.                 notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
    345. 

  345.                 notificationIntent  
    346. 

  346.                         .setAction(android.content.Intent.ACTION_VIEW);  
    347. 

  347. 
                String type = "application/vnd.android.package-archive";  

    348. 

  348.                 notificationIntent.setDataAndType(  
    349. 

  349. 
                        Uri.parse("file:///data/data/"  

    350. 

  350.                                 + context.getPackageName()  
    351. 

  351. 
                                + "/files/"  

    352. 

  352.                                 + (Integer.valueOf(newestVersionCode)  
    353. 

  353. 
                                        .toString()) + ".apk"), type);  

    354. 

  354.                 notification.contentView = rv;  
    355. 

  355.                 notification.flags = Notification.FLAG_AUTO_CANCEL;  
    356. 

  356.                 notification.contentView  
    357. 

  357.                         .setProgressBar(  
    358. 

  358. 
                                R.id.update_notification_progressbar, 100,  

    359. 

  359. 
                                p, false);  

    360. 

  360.                 notification.contentView.setTextViewText(  
    361. 

  361. 
                        R.id.update_notification_progresstext, p + "%");  

    362. 

  362.                 notification.contentView.setTextViewText(  
    363. 

  363. 
                        R.id.update_notification_title, "下载完成，点击安装");  

    364. 

  364.                 PendingIntent contentIntent = PendingIntent.getActivity(  
    365. 

  365. 
                        context, 0, notificationIntent, 0);  

    366. 

  366.                 notification.contentIntent = contentIntent;  
    367. 

  367.             }  
    368. 

  368.   
    369. 

  369. 
        } else if (p == 0) {  

    370. 

  370. 
            notification.tickerText = "准备下载";  

    371. 

  371.             notification.when = System.currentTimeMillis();  
    372. 

  372. 
            Intent notificationIntent = new Intent(context,  

    373. 

  373. 
                    UpdateService.class);  

    374. 

  374.             notificationIntent.setAction(ACTION_STOP);  
    375. 

  375.             notification.flags = notification.flags  
    376. 

  376.                     | Notification.FLAG_ONGOING_EVENT;  
    377. 

  377.             notification.contentView = rv;  
    378. 

  378.             notification.contentView.setProgressBar(  
    379. 

  379. 
                    R.id.update_notification_progressbar, 100, p, true);  

    380. 

  380.             notification.contentView.setTextViewText(  
    381. 

  381. 
                    R.id.update_notification_title, "正在准备下载（点击取消）");  

    382. 

  382.             PendingIntent contentIntent = PendingIntent.getService(context,  
    383. 

  383. 
                    0, notificationIntent, 0);  

    384. 

  384.             notification.contentIntent = contentIntent;  
    385. 

  385. 
            isPercentZeroRunning = true;  

    386. 

  386. 
        } else {  

    387. 

  387. 
            notification.tickerText = "开始下载";  

    388. 

  388.             notification.when = System.currentTimeMillis();  
    389. 

  389. 
            Intent notificationIntent = new Intent(context,  

    390. 

  390. 
                    UpdateService.class);  

    391. 

  391.             notificationIntent.setAction(ACTION_STOP);  
    392. 

  392.             notification.contentView = rv;  
    393. 

  393.             notification.flags = notification.flags  
    394. 

  394.                     | Notification.FLAG_ONGOING_EVENT;  
    395. 

  395.             notification.contentView.setProgressBar(  
    396. 

  396. 
                    R.id.update_notification_progressbar, 100, p, false);  

    397. 

  397.             notification.contentView.setTextViewText(  
    398. 

  398. 
                    R.id.update_notification_progresstext, p + "%");  

    399. 

  399.             notification.contentView.setTextViewText(  
    400. 

  400. 
                    R.id.update_notification_title, "正在下载（点击取消）");  

    401. 

  401.             PendingIntent contentIntent = PendingIntent.getService(context,  
    402. 

  402. 
                    0, notificationIntent, 0);  

    403. 

  403.             notification.contentIntent = contentIntent;  
    404. 

  404.         }  
    405. 

  405.   
    406. 

  406.         mNM.notify(MOOD_NOTIFICATIONS, notification);  
    407. 

  407.     }  
    408. 

  408. }  
    409. 





	class DownloadThread extends Thread {
		private static final String UPDATE_FILE_VERSIONCODE = "updateTemFileVersionCode";
		private static final String UPDATE_FILE_LENGTH = "updateTemFileLength";
		private static final String TEST_UPDATE_FILE_LENGTH = "testupdatefilelength";
		private static final int BUFFER_SIZE = 1024;
		private static final int NETWORK_CONNECTION_TIMEOUT = 15000;
		private static final int NETWORK_SO_TIMEOUT = 15000;
		private int newestVersionCode, existTemFileVersionCode;
		private String downUrl;
		private int fileLength = Integer.MAX_VALUE;
		private int downLength;
		private boolean downFinish;

		private static final int CHECK_FAILED = -1;
		private static final int CHECK_SUCCESS = 0;
		private static final int CHECK_RUNNING = 1;
		private int checkStatus;
		private boolean isChecking = false;

		private Context context;
		private boolean isPercentZeroRunning = false;
		private boolean stop;
		private Object block = new Object();
		private boolean receiverRegistered = false;

		private NotificationManager mNM;
		private RemoteViews rv;

		public DownloadThread(Context context, String downUrl, int versionCode) {
			super("DownloadThread");
			this.downUrl = downUrl;
			this.newestVersionCode = versionCode;
			this.context = context;
			this.mNM = (NotificationManager) context
					.getSystemService(Context.NOTIFICATION_SERVICE);
			this.rv = new RemoteViews(context.getPackageName(), R.layout.notify);
			this.downFinish = false;
		}

		private void checkTemFile() {
			existTemFileVersionCode = preferences().getInt(
					UPDATE_FILE_VERSIONCODE, 0);
			if (newestVersionCode == existTemFileVersionCode
					|| newestVersionCode == TEST) {
				File temFile = new File(context.getFilesDir(),
						Integer.valueOf(newestVersionCode) + ".apk");
				if (!temFile.exists()) {
					saveLogFile(newestVersionCode, 0);
				}
			} else {
				deleteApkFile(existTemFileVersionCode);
				saveLogFile(newestVersionCode, 0);
			}
		}

		private void deleteApkFile(int existVersionCode) {
			File temFile = new File(context.getFilesDir(),
					Integer.valueOf(existVersionCode) + ".apk");
			if (temFile.exists()) {
				temFile.delete();
			}
		}

		private SharedPreferences preferences() {
			return context.getSharedPreferences(context.getPackageName(),
					Context.MODE_WORLD_READABLE | Context.MODE_WORLD_WRITEABLE);
		}

		private void saveLogFile(int versionCode, int downloadLength) {
			SharedPreferences.Editor edit = preferences().edit();
			if (versionCode == TEST) {
				edit.putInt(TEST_UPDATE_FILE_LENGTH, downloadLength);
			} else {
				edit.putInt(UPDATE_FILE_VERSIONCODE, versionCode);
				edit.putInt(UPDATE_FILE_LENGTH, downloadLength);
			}
			edit.commit();
		}

		@Override
		public void run() {
			checkTemFile();
			this.stop = false;
			while (!downFinish) {
				Log.i(TAG, "download thread start : while()");
				if (newestVersionCode == TEST) {
					downLength = preferences().getInt(TEST_UPDATE_FILE_LENGTH,
							0);
				} else {
					downLength = preferences().getInt(UPDATE_FILE_LENGTH, 0);
				}

				InputStream is = null;
				FileOutputStream outStream = null;
				try {
					// check the network
					ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
					NetworkInfo ni = cm.getActiveNetworkInfo();
					boolean con = ni == null ? false : ni
							.isConnectedOrConnecting();
					synchronized (block) {
						if (!con) {
							context.registerReceiver(
									receiver,
									new IntentFilter(
											ConnectivityManager.CONNECTIVITY_ACTION));
							receiverRegistered = true;
							try {
								Log.i(TAG, "network is not ok : block.wait()");
								block.wait();
							} catch (InterruptedException e1) {
							}
						}
					}

					if (fileLength == Integer.MAX_VALUE) {
						URL url = new URL(downUrl);
						HttpURLConnection conn = (HttpURLConnection) url
								.openConnection();
						if (conn.getResponseCode() / 100 == 2
								&& conn.getContentLength() != -1) {
							fileLength = conn.getContentLength();
							Log.i(TAG, "getContentLength == " + fileLength);
						} else {
							Thread.sleep(5000);
							Log.i(TAG, "getContentLength failed : retry in 5 second later");
							continue;
						}
					}

					HttpClient httpClient = new DefaultHttpClient();
					HttpGet request = new HttpGet(downUrl);
					request.addHeader("Range", "bytes=" + downLength + "-");

					if (downLength < fileLength) {
						HttpHost proxy = HttpBase.globalProxy();
						HttpParams httpParams = request.getParams();
						HttpConnectionParams.setConnectionTimeout(httpParams,
								NETWORK_CONNECTION_TIMEOUT);
						HttpConnectionParams.setSoTimeout(httpParams,
								NETWORK_SO_TIMEOUT);
						ConnRouteParams.setDefaultProxy(request.getParams(),
								proxy);

						HttpResponse response = httpClient.execute(request);
						Log.i(TAG, "getContent's response status == "
								+ response.getStatusLine().getStatusCode());
						if (response.getStatusLine().getStatusCode() / 100 != 2) {
							continue;
						}
						HttpEntity entity = response.getEntity();
						is = entity.getContent();
						byte[] buffer = new byte[BUFFER_SIZE];
						int offset = 0;

						if (downLength > 0) {
							outStream = context
									.openFileOutput(
											Integer.valueOf(newestVersionCode)
													+ ".apk",
											Context.MODE_APPEND
													+ Context.MODE_WORLD_READABLE);

						} else {
							outStream = context
									.openFileOutput(
											Integer.valueOf(newestVersionCode)
													+ ".apk",
											Context.MODE_WORLD_READABLE);
						}

						while ((offset = is.read(buffer, 0, BUFFER_SIZE)) != -1
								&& !stop) {
							outStream.write(buffer, 0, offset);
							downLength += offset;
						}
					}
					if (downLength == fileLength) {
						File apkFile = new File(context.getFilesDir(),
								Integer.valueOf(newestVersionCode) + ".apk");
						if (isApkFileOK(apkFile)) {
							checkStatus = CHECK_SUCCESS;
						} else {
							deleteApkFile(newestVersionCode);
							saveLogFile(existTemFileVersionCode, 0);
							checkStatus = CHECK_FAILED;
						}
						this.downFinish = true;
					}

				} catch (Exception e) {
				} finally {
					saveLogFile(newestVersionCode, downLength);
					if (receiverRegistered) {
						context.unregisterReceiver(receiver);
						receiverRegistered = false;
					}

					if (stop || downFinish) {
						break;
					}
					try {
						if (outStream != null) {
							outStream.close();
						}
						if (is != null) {
							is.close();
						}
					} catch (IOException e) {
					}
				}
			}

		}

		@Override
		public void interrupt() {
			synchronized (block) {
				Log.i(TAG, "block.notify()");
				block.notify();
			}
		}

		private void cancel() {
			stop = true;
			mNM.cancel(MOOD_NOTIFICATIONS);
		}

		private boolean isApkFileOK(File file) {
			checkStatus = CHECK_RUNNING;
			// first check the file header
			/*if (file.isDirectory() || !file.canRead() || file.length() < 4) {
				return false;
			}
			DataInputStream in = null;
			try {
				in = new DataInputStream(new BufferedInputStream(
						new FileInputStream(file)));
				int test = in.readInt();
				if (test != 0x504b0304)
					return false;
			} catch (IOException e) {
				return false;
			} finally {
				try {
					in.close();
				} catch (IOException e) {
				}
			}*/

			// second unZip file to check(without saving)
			boolean result = unzip(file);
			isChecking = false;
			return result;
		}

		private boolean unzip(File unZipFile) {
			boolean succeed = true;
			ZipInputStream zin = null;
			ZipEntry entry = null;
			try {
				zin = new ZipInputStream(new FileInputStream(unZipFile));
				boolean first = true;
				while (true) {
					if ((entry = zin.getNextEntry()) == null) {
						if (first)
							succeed = false;
						break;
					}
					first = false;
					if (entry.isDirectory()) {
						zin.closeEntry();
						continue;
					}
					if (!entry.isDirectory()) {
						byte[] b = new byte[1024];
						@SuppressWarnings("unused")
						int len = 0;
						while ((len = zin.read(b)) != -1) {
						}
						zin.closeEntry();
					}
				}
			} catch (IOException e) {
				succeed = false;
			} finally {
				if (null != zin) {
					try {
						zin.close();
					} catch (IOException e) {
					}
				}
			}
			return succeed;
		}

		public void showNotification() {
			float result = (float) downLength / (float) fileLength;
			int p = (int) (result * 100);
			if (p == 0 && isPercentZeroRunning || p == 100 && isChecking) {
				return;
			} else if (p != 0) {
				isPercentZeroRunning = false;
			}
			Notification notification = new Notification(R.drawable.icon, null,
					0);

			if (p == 100) {
				if (checkStatus == CHECK_RUNNING) {
					notification.tickerText = "开始检查下载文件";
					notification.when = System.currentTimeMillis();
					notification.flags = notification.flags
							| Notification.FLAG_ONGOING_EVENT
							| Notification.FLAG_NO_CLEAR;
					notification.contentView = rv;
					notification.contentView.setProgressBar(
							R.id.update_notification_progressbar, 100, p, true);
					notification.contentView.setTextViewText(
							R.id.update_notification_title, "正在检查下载文件...");
					PendingIntent contentIntent = PendingIntent.getActivity(
							context, 0, null, 0);
					notification.contentIntent = contentIntent;
					isChecking = true;
				} else if (checkStatus == CHECK_FAILED) {
					notification.tickerText = "文件验证失败！";
					notification.when = System.currentTimeMillis();
					notification.flags = notification.flags
							| Notification.FLAG_AUTO_CANCEL;
					notification.contentView = rv;
					notification.contentView.setProgressBar(
							R.id.update_notification_progressbar, 100, p, false);
					notification.contentView.setTextViewText(
							R.id.update_notification_title, "文件验证失败，请重新下载");
					Intent notificationIntent = new Intent(context,
							UpdateService.class);
					notificationIntent.setAction(ACTION_STOP);
					PendingIntent contentIntent = PendingIntent.getService(
							context, 0, notificationIntent, 0);
					notification.contentIntent = contentIntent;
				} else {
					notification.tickerText = "下载完成";
					notification.when = System.currentTimeMillis();
					Intent notificationIntent = new Intent();
					notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
					notificationIntent
							.setAction(android.content.Intent.ACTION_VIEW);
					String type = "application/vnd.android.package-archive";
					notificationIntent.setDataAndType(
							Uri.parse("file:///data/data/"
									+ context.getPackageName()
									+ "/files/"
									+ (Integer.valueOf(newestVersionCode)
											.toString()) + ".apk"), type);
					notification.contentView = rv;
					notification.flags = Notification.FLAG_AUTO_CANCEL;
					notification.contentView
							.setProgressBar(
									R.id.update_notification_progressbar, 100,
									p, false);
					notification.contentView.setTextViewText(
							R.id.update_notification_progresstext, p + "%");
					notification.contentView.setTextViewText(
							R.id.update_notification_title, "下载完成，点击安装");
					PendingIntent contentIntent = PendingIntent.getActivity(
							context, 0, notificationIntent, 0);
					notification.contentIntent = contentIntent;
				}

			} else if (p == 0) {
				notification.tickerText = "准备下载";
				notification.when = System.currentTimeMillis();
				Intent notificationIntent = new Intent(context,
						UpdateService.class);
				notificationIntent.setAction(ACTION_STOP);
				notification.flags = notification.flags
						| Notification.FLAG_ONGOING_EVENT;
				notification.contentView = rv;
				notification.contentView.setProgressBar(
						R.id.update_notification_progressbar, 100, p, true);
				notification.contentView.setTextViewText(
						R.id.update_notification_title, "正在准备下载（点击取消）");
				PendingIntent contentIntent = PendingIntent.getService(context,
						0, notificationIntent, 0);
				notification.contentIntent = contentIntent;
				isPercentZeroRunning = true;
			} else {
				notification.tickerText = "开始下载";
				notification.when = System.currentTimeMillis();
				Intent notificationIntent = new Intent(context,
						UpdateService.class);
				notificationIntent.setAction(ACTION_STOP);
				notification.contentView = rv;
				notification.flags = notification.flags
						| Notification.FLAG_ONGOING_EVENT;
				notification.contentView.setProgressBar(
						R.id.update_notification_progressbar, 100, p, false);
				notification.contentView.setTextViewText(
						R.id.update_notification_progresstext, p + "%");
				notification.contentView.setTextViewText(
						R.id.update_notification_title, "正在下载（点击取消）");
				PendingIntent contentIntent = PendingIntent.getService(context,
						0, notificationIntent, 0);
				notification.contentIntent = contentIntent;
			}

			mNM.notify(MOOD_NOTIFICATIONS, notification);
		}
	}



可以看到，我的下载是包裹在一个while循环中的，假如没有下载完成，我会一直重复这个循环，可以注意到，我在取数据的时候有个标志位stop 


 


 







[java] view plaincopyprint?





    

  1. while ((offset = is.read(buffer, 0, BUFFER_SIZE)) != -1  
    2. 

  2.                                 && !stop) {  
    3. 

  3. 
                            outStream.write(buffer, 0, offset);  

    4. 

  4.                             downLength += offset;  
    5. 

  5.                         }  
    6. 





while ((offset = is.read(buffer, 0, BUFFER_SIZE)) != -1
								&& !stop) {
							outStream.write(buffer, 0, offset);
							downLength += offset;
						}




有了这个就可以在外面控制强制停止下载。 


 


 


在下载开始阶段我最先做的时就是检查网络情况，如果没有网络，我就使用一个block让这个线程阻塞掉，有人会问那什么时候恢复呢？我在service里面加了个广播


 







[java] view plaincopyprint?





    

  1. private final BroadcastReceiver receiver = new BroadcastReceiver() {  
    2. 

  2.   
    3. 

  3. 
        @Override  

    4. 

  4. 
        public void onReceive(Context context, Intent intent) {  

    5. 

  5. 
            if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent  

    6. 

  6.                     .getAction())) {  
    7. 

  7.                 NetworkInfo info = (NetworkInfo) intent  
    8. 

  8.                         .getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);  
    9. 

  9. 
                boolean hasConnectivity = (info != null && info.isConnected()) ? true  

    10. 

  10. 
                        : false;  

    11. 

  11. 
                if (hasConnectivity && downloadThread != null) {  

    12. 

  12.                     downloadThread.interrupt();  
    13. 

  13.                 }  
    14. 

  14.             }  
    15. 

  15.         }  
    16. 

  16.   
    17. 

  17. };  
    18. 





private final BroadcastReceiver receiver = new BroadcastReceiver() {

		@Override
		public void onReceive(Context context, Intent intent) {
			if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent
					.getAction())) {
				NetworkInfo info = (NetworkInfo) intent
						.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
				boolean hasConnectivity = (info != null && info.isConnected()) ? true
						: false;
				if (hasConnectivity && downloadThread != null) {
					downloadThread.interrupt();
				}
			}
		}

};



可以监听系统网络情况，如果连上了，就调用interrupt()来唤醒线程。这样做的好处时，在没有网络时，这个线程不会无限循环的去获取数据。 


 


 


最后在这个版本发布后因为代码一些bug导致，如果网络数据获取有问题，则用户下载下来的安装包就会解析错误，而且这是个死胡同，除非去手动下载个好的安装包来装，否则我们软件会一直提示，一直完成，但是一直装不上。。。哎，我们用户可是百万级啊，这个bug很致命，还好当时做了备用方案，可以由服务器控制客户端更新方法，于是改为以前的更新。


 


这也是我在上面的代码中下载完成时加入了最后一步，校验安装包的过程。我们都知道apk就是一个zip文件，通常对一个zip文件的校验，最简单的是校验文件头是不是0x504b0304，但是这只是文件格式的判断，加入是文件内容字节损坏还是查不出来，只能通过去unzip这个文件来捕获异常。在上面unzip(File unZipFile)方法中，我尝试去解压软件，对ZipInputStream流我没做任何处理，仅仅是看这个解压过程是否正常，以此判断这个zip文件是否正常，暂时也没想到更好的办法。


 







[java] view plaincopyprint?





    

  1. private boolean unzip(File unZipFile) {  
    2. 

  2. 
    boolean succeed = true;  

    3. 

  3. 
    ZipInputStream zin = null;  

    4. 

  4. 
    ZipEntry entry = null;  

    5. 

  5. 
    try {  

    6. 

  6. 
        zin = new ZipInputStream(new FileInputStream(unZipFile));  

    7. 

  7. 
        boolean first = true;  

    8. 

  8. 
        while (true) {  

    9. 

  9. 
            if ((entry = zin.getNextEntry()) == null) {  

    10. 

  10. 
                if (first)  

    11. 

  11. 
                    succeed = false;  

    12. 

  12. 
                break;  

    13. 

  13.             }  
    14. 

  14. 
            first = false;  

    15. 

  15. 
            if (entry.isDirectory()) {  

    16. 

  16.                 zin.closeEntry();  
    17. 

  17. 
                continue;  

    18. 

  18.             }  
    19. 

  19. 
            if (!entry.isDirectory()) {  

    20. 

  20. 
                byte[] b = new byte[1024];  

    21. 

  21. 
                @SuppressWarnings("unused")  

    22. 

  22. 
                int len = 0;  

    23. 

  23. 
                while ((len = zin.read(b)) != -1) {  

    24. 

  24.                 }  
    25. 

  25.                 zin.closeEntry();  
    26. 

  26.             }  
    27. 

  27.         }  
    28. 

  28. 
    } catch (IOException e) {  

    29. 

  29. 
        succeed = false;  

    30. 

  30. 
    } finally {  

    31. 

  31. 
        if (null != zin) {  

    32. 

  32. 
            try {  

    33. 

  33.                 zin.close();  
    34. 

  34. 
            } catch (IOException e) {  

    35. 

  35.             }  
    36. 

  36.         }  
    37. 

  37.     }  
    38. 

  38. 
    return succeed;  

    39. 

  39. }  
    40. 





		private boolean unzip(File unZipFile) {
			boolean succeed = true;
			ZipInputStream zin = null;
			ZipEntry entry = null;
			try {
				zin = new ZipInputStream(new FileInputStream(unZipFile));
				boolean first = true;
				while (true) {
					if ((entry = zin.getNextEntry()) == null) {
						if (first)
							succeed = false;
						break;
					}
					first = false;
					if (entry.isDirectory()) {
						zin.closeEntry();
						continue;
					}
					if (!entry.isDirectory()) {
						byte[] b = new byte[1024];
						@SuppressWarnings("unused")
						int len = 0;
						while ((len = zin.read(b)) != -1) {
						}
						zin.closeEntry();
					}
				}
			} catch (IOException e) {
				succeed = false;
			} finally {
				if (null != zin) {
					try {
						zin.close();
					} catch (IOException e) {
					}
				}
			}
			return succeed;
		}





  


  

    
    
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