Android的apk下载和安装

  1     /**
  2      * 下载apk
  3      */
  4     private static void downApk(final String url) {
  5         new Thread() {
  6             public void run() {
  7                 HttpClient client = new DefaultHttpClient();
  8                 HttpGet get = new HttpGet(url);
  9                 HttpResponse response;
 10                 try {
 11                     response = client.execute(get);
 12                     HttpEntity entity = response.getEntity();
 13                     apkSize = (int) entity.getContentLength();
 14 
 15                     InputStream is = entity.getContent();
 16 
 17                     FileOutputStream fileOutputStream = null;
 18                     if (is != null) {
 19                         File file = null;
 20                         if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
 21                             file = new File(Environment.getExternalStorageDirectory(), UPDATE_SERVERAPK);
 22                             if (!file.exists()) {
 23                                 file.createNewFile();
 24                             }
 25                         } else {
 26                             file = new File(context.getFilesDir(), "**.apk");
 27                             if (!file.exists()) {
 28                                 file.createNewFile();
 29                             }
 30 
 31                         }
 32                         fileOutputStream = new FileOutputStream(file);
 33                         byte[] b = new byte[1024];
 34                         int charb = -1;
 35                         int count = 0;
 36                         while ((charb = is.read(b)) != -1) {
 37                             fileOutputStream.write(b, 0, charb);
 38                             count += charb;
 39                             downLoadFileSize = count;
 40                             sendMsg(1);
 41 
 42                         }
 43                     }
 44                     fileOutputStream.flush();
 45                     if (fileOutputStream != null) {
 46                         fileOutputStream.close();
 47                     }
 48                     sendMsg(2);
 49                 } catch (Exception e) {
 50                     // TODO Auto-generated catch block
 51                     e.printStackTrace();
 52                 }
 53             }
 54         }.start();
 55     }
 56 
 57     private static Handler handler = new Handler() {
 58 
 59         @Override
 60         public void handleMessage(Message msg) {
 61 
 62             super.handleMessage(msg);
 63 
 64             // 定义一个Handler，用于处理下载线程与UI间通讯
 65             if (!Thread.currentThread().isInterrupted()) {
 66                 switch (msg.what) {
 67                 case 0:
 68                     progress.setMax(100);
 69                 case 1:
 70                     int temp = ApkSize / 100;
 71 
 72                     progress.setProgress((downLoadFileSize / temp));
 73                     break;
 74                 case 2:
 75                     progress.cancel();
 76                     update();
 77                     break;
 78 
 79                 case -1:
 80                     String error = msg.getData().getString("error");
 81                     Toast.makeText(context, error, 1).show();
 82                     break;
 83                 }
 84             }
 85 
 86         }
 87     };
 88 
 89     /**
 90      * 下载完成，通过handler将下载对话框取消
 91      */
 92     private static void sendMsg(int flag) {
 93         Message msg = new Message();
 94         msg.what = flag;
 95         handler.sendMessage(msg);
 96     }
 97 
 98     /**
 99      * 安装应用
100      */
101     private static void update() {
102         Intent intent = new Intent(Intent.ACTION_VIEW);
103         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
104         intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
105         intent.setAction(Intent.ACTION_VIEW);
106 
107         if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
108             intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "**.apk")), "application/vnd.android.package-archive");
109 
110         } else {
111             File file = new File(context.getFilesDir(), "**.apk");
112 
113             String cmd = "chmod 777 " + file.getAbsolutePath();
114             try {
115                 Runtime.getRuntime().exec(cmd);
116 
117             } catch (Exception e) {
118 
119                 e.printStackTrace();
120             }
121 
122             intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
123 
124         }
125         context.startActivity(intent);
126     }
127 }