Android 程序使用代码的安装和卸载

安装：

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1. String str = "/CanavaCancel.apk";  
2. String fileName = Environment.getExternalStorageDirectory() + str;  
3. Intent intent = new Intent(Intent.ACTION_VIEW);  
4. intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive");  
5. startActivity(intent);  

卸载：

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1. Uri packageURI = Uri.parse("package:com.demo.CanavaCancel");     
2. Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);     
3. startActivity(uninstallIntent);  

Environment拥有一些可以获取环境变量的方法 
package:com.demo.CanavaCancel 这个形式是 package:程序完整的路径 (包名+程序名).

//下载apk程序代码

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1. protected File downLoadFile(String httpUrl) {  
2.     // TODO Auto-generated method stub  
3.     final String fileName = "updata.apk";  
4.     File tmpFile = new File("/sdcard/update");  
5.     if (!tmpFile.exists()) {  
6.             tmpFile.mkdir();  
7.     }  
8.     final File file = new File("/sdcard/update/" + fileName);  
9.   
10.     try {  
11.             URL url = new URL(httpUrl);  
12.             try {  
13.                     HttpURLConnection conn = (HttpURLConnection) url  
14.                                     .openConnection();  
15.                     InputStream is = conn.getInputStream();  
16.                     FileOutputStream fos = new FileOutputStream(file);  
17.                     byte[] buf = new byte[256];  
18.                     conn.connect();  
19.                     double count = 0;  
20.                     if (conn.getResponseCode() >= 400) {  
21.                             Toast.makeText(Main.this, "连接超时", Toast.LENGTH_SHORT)  
22.                                             .show();  
23.                     } else {  
24.                             while (count <= 100) {  
25.                                     if (is != ) {  
26.                                             int numRead = is.read(buf);  
27.                                             if (numRead <= 0) {  
28.                                                     break;  
29.                                             } else {  
30.                                                     fos.write(buf, 0, numRead);  
31.                                             }  
32.   
33.                                     } else {  
34.                                             break;  
35.                                     }  
36.   
37.                             }  
38.                     }  
39.   
40.                     conn.disconnect();  
41.                     fos.close();  
42.                     is.close();  
43.             } catch (IOException e) {  
44.                     // TODO Auto-generated catch block  
45.   
46.                     e.printStackTrace();  
47.             }  
48.     } catch (MalformedURLException e) {  
49.             // TODO Auto-generated catch block  
50.   
51.             e.printStackTrace();  
52.     }  
53.   
54.     return file;  
55. }  

//打开APK程序代码

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1. private void openFile(File file) {  
2.         // TODO Auto-generated method stub  
3.         Log.e("OpenFile", file.getName());  
4.         Intent intent = new Intent();  
5.         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
6.         intent.setAction(android.content.Intent.ACTION_VIEW);  
7.         intent.setDataAndType(Uri.fromFile(file),  
8.                         "application/vnd.android.package-archive");  
9.         startActivity(intent);  
10. }