弹框--更新下载--安装

 1     /**
 2      * show出对话框
 3      */
 4     private void showUpdataDialog() {
 5         AlertDialog.Builder builder = new Builder(this);
 6         builder.setTitle("版本升级");
 7         builder.setMessage(info.getDescription());
 8         builder.setCancelable(false);
 9         builder.setPositiveButton("是", new OnClickListener() {
10             public void onClick(DialogInterface dialog, int which) {
11                 System.out.println("升级");
12                 // 判断SD卡状态是否可用
13                 if (Environment.getExternalStorageState().equals(
14                         Environment.MEDIA_MOUNTED)) {
15                     // 下载是耗时的工作，需要放入到子线程里面去执行
16                     DownLoadFileThreadTask download = new DownLoadFileThreadTask(
17                             info.getApkurl(), "/sdcard/new.apk");
18                     pd.show();
19                     new Thread(download).start();
20                     mainUI();
21                 } else {
22
23                 }
24             }
25         });
26         builder.setNegativeButton("否", new OnClickListener() {
27             public void onClick(DialogInterface dialog, int which) {
28                 System.out.println("不升级，进入主界面");
29                 mainUI();
30             }
31         });
32         builder.create().show();
33     }
34
35     /**
36      * 安装apk
37      */
38     private void installAPK(File file) {
39         Intent intent = new Intent();
40         intent.setAction(Intent.ACTION_VIEW);
41         intent.setDataAndType(Uri.fromFile(file),
42                 "application/vnd.android.package-archive");
43         finish();
44         startActivity(intent);
45     }
46
47     /**
48      * 下载APK
49      */
50     private class DownLoadFileThreadTask implements Runnable {
51         String apkurl;
52         String fileurl;
53
54         public DownLoadFileThreadTask(String apkurl, String fileurl) {
55             this.apkurl = apkurl;
56             this.fileurl = fileurl;
57         }
58
59         public void run() {
60             DownLoadFileTask down = new DownLoadFileTask();
61             try {
62                 File file = down.getFile(apkurl, fileurl, pd);
63                 System.out.println("下载完成，进行安装");
64                 pd.dismiss();
65                 installAPK(file);
66             } catch (Exception e) {
67                 e.printStackTrace();
68                 Toast.makeText(getApplicationContext(), "下载文件失败", 0).show();
69                 pd.dismiss();
70                 mainUI();
71             }
72         }
73     }
74
75     /**
76      * 获得版本号
77      */
78     private String getVession() {
79
80         try {
81             PackageManager pm = getPackageManager();
82             // 第一个参数获得包的名字
83             PackageInfo info = pm.getPackageInfo(getPackageName(), 0);
84             return info.versionName;
85         } catch (Exception e) {
86             // TODO Auto-generated catch block
87             e.printStackTrace();
88         }
89         return null;
90     }

 1 package cn.itcast.mobilesafe.engine;
 2
 3 import java.io.File;
 4 import java.io.FileOutputStream;
 5 import java.io.InputStream;
 6 import java.net.HttpURLConnection;
 7 import java.net.URL;
 8 import android.app.ProgressDialog;
 9
10 public class DownLoadFileTask {
11
12     /**
13      *
14      * @param path
15      *            服务器文件路径
16      * @param filepath
17      *            本地文件路径
18      * @return 本地文件对象
19      * @throws Exception
20      */
21     public static File getFile(String path, String filepath, ProgressDialog pd)
22             throws Exception {
23         URL url = new URL(path);
24         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
25         conn.setRequestMethod("GET");
26         conn.setConnectTimeout(5000);
27         if (conn.getResponseCode() == 200) {
28             int total = conn.getContentLength();
29             pd.setMax(total);
30             InputStream is = conn.getInputStream();
31             File file = new File(filepath);
32             FileOutputStream fos = new FileOutputStream(file);
33             byte[] buffer = new byte[1024];
34             int len = 0;
35             int process = 0;
36             while ((len = is.read(buffer)) != -1) {
37                 fos.write(buffer, 0, len);
38                 process += len;
39                 pd.setProgress(process);
40                 Thread.sleep(50);
41             }
42             fos.flush();
43             fos.close();
44             is.close();
45
46             return file;
47         }
48         return null;
49     }
50 }