一段Android实现应用下载并自动安装apk包的代码

下载apk程序代码

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, "连接超时", 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;
    }

//打开APK程序代码

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);
}

安装

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);
删除

Uri packageURI = Uri.parse(“package:com.demo.CanavaCancel”);
Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
startActivity(uninstallIntent);