正文转自:http://www.oschina.net/question/163910_28462

我们看许多Android应用还兼备自动更新功能,用户一键就得做到软件的晋升更新。得益于Android系统的软件包管理和安装机制,这等同功力实现起来相当简单,下面我们虽来施行一下。首先被出界面效果:

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1. 预备知识
以AndroidManifest.xml里定义了每个Android apk的版标识:

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1 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
2       package="com.myapp" 
3       android:versionCode="1" 
4       android:versionName="1.0.0"
5 <application></application
6 </manifest>

 

 

中间,android:versionCode和android:versionName两只字段分别代表版本代码,版本名称。versionCode是
整型数字,versionName是字符串。由于version是给用户看之,不绝好比较大小,升级检查时,可以坐检查versionCode为主,方
就比出版本的上下大小。
那么,在使用被什么读取AndroidManifest.xml中的versionCode和versionName呢?可以用PackageManager的API,参考以下代码:

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01 public static int getVerCode(Context context) {
02         int verCode = -1;
03         try {
04             verCode = context.getPackageManager().getPackageInfo(
05                     "com.myapp", 0).versionCode;
06         } catch (NameNotFoundException e) {
07             Log.e(TAG, e.getMessage());
08         }
09         return verCode;
10     }
11     
12     public static String getVerName(Context context) {
13         String verName = "";
14         try {
15             verName = context.getPackageManager().getPackageInfo(
16                     "com.myapp", 0).versionName;
17         } catch (NameNotFoundException e) {
18             Log.e(TAG, e.getMessage());
19         }
20         return verName;  
21 }

 

 

或者在AndroidManifest中将android:versionName=”1.2.0″写成
android:versionName=”@string/app_versionName”,然后于values/strings.xml中上加对承诺
字符串,这样实现后,就好使用如下代码获得本名称:

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1 public static String getVerName(Context context) {
2         String verName = context.getResources()
3         .getText(R.string.app_versionName).toString();
4         return verName;
5 }

 

 

同理,apk的施用名称可以这样获得:

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1 public static String getAppName(Context context) {
2         String verName = context.getResources()
3         .getText(R.string.app_name).toString();
4         return verName;
5 }

 

 

 

2. 流水线框架

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3. 版本检查
以服务端放置最新版本的apk文件,如:http://localhost/myapp/myapp.apk
同时,在服务端放置对应此apk的版本信息调用接口或者文件,如:http://localhost/myapp/ver.json
ver.json中之始末也:

[{“appname”:”jtapp12″,”apkname”:”jtapp-12-updateapksamples.apk”,”verName”:1.0.1,”verCode”:2}]
 

下一场,在大哥大客户端上进展版本读取和反省:

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01 private boolean getServerVer () {
02         try {
03             String verjson = NetworkTool.getContent(Config.UPDATE_SERVER
04                     + Config.UPDATE_VERJSON);
05             JSONArray array = new JSONArray(verjson);
06             if (array.length() > 0) {
07                 JSONObject obj = array.getJSONObject(0);
08                 try {
09                     newVerCode = Integer.parseInt(obj.getString("verCode"));
10                     newVerName = obj.getString("verName");
11                 } catch (Exception e) {
12                     newVerCode = -1;
13                     newVerName = "";
14                     return false;
15                 }
16             }
17         } catch (Exception e) {
18             Log.e(TAG, e.getMessage());
19             return false;
20         }
21         return true;
22     }

 

 

于服务器和客户端的版本,并进行翻新操作。

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1 if (getServerVerCode()) {
2          int vercode = Config.getVerCode(this); // 用到前面第一节写的方法
3          if (newVerCode > vercode) {
4              doNewVersionUpdate(); // 更新新版本
5          } else {
6              notNewVersionShow(); // 提示当前为最新版本
7          }
8      }

 

 

详尽措施:

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01 private void notNewVersionShow() {
02     int verCode = Config.getVerCode(this);
03     String verName = Config.getVerName(this);
04     StringBuffer sb = new StringBuffer();
05     sb.append("当前版本:");
06     sb.append(verName);
07     sb.append(" Code:");
08     sb.append(verCode);
09     sb.append(",/n已是最新版,无需更新!");
10     Dialog dialog = new AlertDialog.Builder(Update.this).setTitle("软件更新")
11             .setMessage(sb.toString())// 设置内容
12             .setPositiveButton("确定",// 设置确定按钮
13                     new DialogInterface.OnClickListener() {
14                         @Override
15                         public void onClick(DialogInterface dialog,
16                                 int which) {
17                             finish();
18                         }
19                     }).create();// 创建
20     // 显示对话框
21     dialog.show();
22 }
23 private void doNewVersionUpdate() {
24     int verCode = Config.getVerCode(this);
25     String verName = Config.getVerName(this);
26     StringBuffer sb = new StringBuffer();
27     sb.append("当前版本:");
28     sb.append(verName);
29     sb.append(" Code:");
30     sb.append(verCode);
31     sb.append(", 发现新版本:");
32     sb.append(newVerName);
33     sb.append(" Code:");
34     sb.append(newVerCode);
35     sb.append(", 是否更新?");
36     Dialog dialog = new AlertDialog.Builder(Update.this)
37         .setTitle("软件更新")
38         .setMessage(sb.toString())
39         // 设置内容
40         .setPositiveButton("更新",// 设置确定按钮
41             new DialogInterface.OnClickListener() {
42                 @Override
43                 public void onClick(DialogInterface dialog,
44                         int which) {
45                     pBar = new ProgressDialog(Update.this);
46                     pBar.setTitle("正在下载");
47                     pBar.setMessage("请稍候...");
48                     pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
49                     downFile(Config.UPDATE_SERVER + Config.UPDATE_APKNAME);
50                 }
51             })
52         .setNegativeButton("暂不更新",
53             new DialogInterface.OnClickListener() {
54                 public void onClick(DialogInterface dialog,
55                         int whichButton) {
56                     // 点击"取消"按钮之后退出程序
57                     finish();
58                 }
59             }).create();// 创建
60     // 显示对话框
61     dialog.show();
62 }

 

 

 

4. 下载模块

横流,本有参考了前人的有关兑现,见
jsonhttp://apps.hi.baidu.com/share/detail/24172508

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01 void downFile(final String url) {
02 pBar.show();
03 new Thread() {
04     public void run() {
05     HttpClient client = new DefaultHttpClient();
06     HttpGet get = new HttpGet(url);
07     HttpResponse response;
08     try {
09         response = client.execute(get);
10         HttpEntity entity = response.getEntity();
11         long length = entity.getContentLength();
12         InputStream is = entity.getContent();
13         FileOutputStream fileOutputStream = null;
14         if (is != null) {
15         File file = new File(
16             Environment.getExternalStorageDirectory(),
17             Config.UPDATE_SAVENAME);
18         fileOutputStream = new FileOutputStream(file);
19         byte[] buf = new byte[1024];
20         int ch = -1;
21         int count = 0;
22         while ((ch = is.read(buf)) != -1) {
23             fileOutputStream.write(buf, 0, ch);
24             count += ch;
25             if (length > 0) {
26             }
27         }
28         }
29         fileOutputStream.flush();
30         if (fileOutputStream != null) {
31         fileOutputStream.close();
32         }
33         down();
34     } catch (ClientProtocolException e) {
35         e.printStackTrace();
36     } catch (IOException e) {
37         e.printStackTrace();
38     }
39     }
40 }.start();
41 }

 

 

下载完成,通过handler通知主ui线程将下载对话框取消。

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1 void down() {
2         handler.post(new Runnable() {
3             public void run() {
4                 pBar.cancel();
5                 update();
6             }
7         });
8 }

 

 

5. 设置使用

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1 <strong>    void update() {
2         Intent intent = new Intent(Intent.ACTION_VIEW);
3         intent.setDataAndType(Uri.fromFile(new File(Environment
4                 .getExternalStorageDirectory(), Config.UPDATE_SAVENAME)),
5                 "application/vnd.android.package-archive");
6         startActivity(intent);
7     }</strong>

一经您用apk应用发布到market上,那么,你晤面发现market内盖了接近的模块,可以自动更新或者提醒您是否更新应用。那么,对于你协调之
应用需要自动更新的说话,自己内建一个凡是未是更进一步便宜了邪?本文提到的代码大多是以UpdateActivity.java中实现,为了能够如更新过程更加
友好,可以于前期launcher的Activity中建立一个线程,用来检查服务端是否生创新。有更新的时刻即便启动UpdateActivity,这样
的运用体验越来越平缓。
正文例程源码查看/下载:
http://code.google.com/p/androidex/source/browse/trunk/jtapp-12-updateapksamples

版权归个人所有,转载请注明出处

http://blog.csdn.net/xjanker2/archive/2011/04/06/6303937.aspx

 

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