Android实现应用下载并自动安装apk包

安装：

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String str = "/CanavaCancel.apk"; 

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String fileName = Environment.getExternalStorageDirectory() + str; 

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Intent intent = new Intent(Intent.ACTION_VIEW); 

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intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive"); 

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startActivity(intent);

卸载：

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Uri packageURI = Uri.parse("package:com.demo.CanavaCancel");   

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Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);   

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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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protected File downLoadFile(String httpUrl) {

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                // TODO Auto-generated method stub

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                final String fileName = "updata.apk";

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                File tmpFile = new File("/sdcard/update");

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                if (!tmpFile.exists()) {

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                        tmpFile.mkdir();

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                }

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                final File file = new File("/sdcard/update/" + fileName);

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                try {

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                        URL url = new URL(httpUrl);

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                        try {

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                                HttpURLConnection conn = (HttpURLConnection) url

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                                                .openConnection();

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                                InputStream is = conn.getInputStream();

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                                FileOutputStream fos = new FileOutputStream(file);

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                                byte[] buf = new byte[256];

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                                conn.connect();

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                                double count = 0;

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                                if (conn.getResponseCode() >= 400) {

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                                        Toast.makeText(Main.this, "连接超时", Toast.LENGTH_SHORT)

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                                                        .show();

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                                } else {

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                                        while (count <= 100) {

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                                                if (is != null) {

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                                                        int numRead = is.read(buf);

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                                                        if (numRead <= 0) {

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                                                                break;

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                                                        } else {

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                                                                fos.write(buf, 0, numRead);

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                                                        }

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                                                } else {

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                                                        break;

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                                                }

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                                        }

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                                }

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                                conn.disconnect();

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                                fos.close();

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                                is.close();

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                        } catch (IOException e) {

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                                // TODO Auto-generated catch block

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                                e.printStackTrace();

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                        }

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                } catch (MalformedURLException e) {

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                        // TODO Auto-generated catch block

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                        e.printStackTrace();

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                }

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                return file;

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        }

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//打开APK程序代码

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private void openFile(File file) {

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                // TODO Auto-generated method stub

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                Log.e("OpenFile", file.getName());

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                Intent intent = new Intent();

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                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

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                intent.setAction(android.content.Intent.ACTION_VIEW);

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                intent.setDataAndType(Uri.fromFile(file),

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                                "application/vnd.android.package-archive");

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                startActivity(intent);

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        }