Android程式使用代碼的安裝和卸載！！！

Android程式使用代碼的安裝和卸載！！！ http://www.cnblogs.com/Greenwood/archive/2011/03/09/1979268.html 安裝：

String str = "/CanavaCancel.apk";
String fileName = Environment.getExternalStorageDirectory() + str;
Intent intent = new Intent(Intent.ACTION_VIEW);
 intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive");
startActivity(intent); 卸載：Uri packageURI = Uri.parse("package:com.demo.CanavaCancel");   Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);   startActivity(uninstallIntent);Environment擁有一些可以擷取環境變數的方法 package:com.demo.CanavaCancel 這個形式是 package:程式完整的路徑 (包名+程式名).

//下載apk程式碼

protected File downLoadFile(String httpUrl) {                // TODO Auto-generated method stub                final String fileName = "updata.apk";                File tmpFile = new File("/sdcard/update");                if (!tmpFile.exists()) {                        tmpFile.mkdir();                }                final File file = new File("/sdcard/update/" + fileName);                try {                        URL url = new URL(httpUrl);                        try {                                HttpURLConnection conn = (HttpURLConnection) url                                                .openConnection();                                InputStream is = conn.getInputStream();                                FileOutputStream fos = new FileOutputStream(file);                                byte[] buf = new byte[256];                                conn.connect();                                double count = 0;                                if (conn.getResponseCode() >= 400) {                                        Toast.makeText(Main.this, "連線逾時", Toast.LENGTH_SHORT)                                                        .show();                                } else {                                        while (count <= 100) {                                                if (is != null) {                                                        int numRead = is.read(buf);                                                        if (numRead <= 0) {                                                                break;                                                        } else {                                                                fos.write(buf, 0, numRead);                                                        }                                                } else {                                                        break;                                                }                                        }                                }                                conn.disconnect();                                fos.close();                                is.close();                        } catch (IOException e) {                                // TODO Auto-generated catch block                                e.printStackTrace();                        }                } catch (MalformedURLException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                }                return file;        }

//開啟APK程式碼

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