Android 版本检测

/** *  * 版本检测，自动更新 * 1.通过Url检测更新 2.下载并安装更新 3.删除临时路径 *  */public class Update {// 调用更新的Activitypublic Activity activity = null;// 当前版本号public int versionCode = 0;// 当前版本名称public String versionName = "";// 控制台信息标识private static final String TAG = "AutoUpdate";// 文件当前路径private String currentFilePath = "";// 安装包文件临时路径private String currentTempFilePath = "";// 获得文件扩展名字符串private String fileEx = "";// 获得文件名字符串private String fileNa = "";// 服务器地址private String strURL = "http://127.0.0.1:8080/ApiDemos.apk";private ProgressDialog dialog;/** *  * 构造方法，获得当前版本信息 *  *  * @param activity */public Update(Activity activity) {this.activity = activity;// 获得当前版本getCurrentVersion();}/** *  * 检测更新 */public void check() {// 检测网络if (isNetworkAvailable(this.activity) == false) {return;}// 如果网络可用，检测到新版本if (true) {// 弹出对话框，选择是否需要更新版本showUpdateDialog();}}/** *  * 检测是否有可用网络 *  *  * @param context *  * @return 网络连接状态 */public static boolean isNetworkAvailable(Context context) {try {ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);// 获取网络信息NetworkInfo info = cm.getActiveNetworkInfo();// 返回检测的网络状态return (info != null && info.isConnected());} catch (Exception e) {e.printStackTrace();return false;}}/** *  * 弹出对话框，选择是否需要更新版本 */public void showUpdateDialog() {@SuppressWarnings("unused")AlertDialog alert = new AlertDialog.Builder(this.activity).setTitle("新版本").setIcon(R.drawable.ic_launcher).setMessage("是否更新？").setPositiveButton("是", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {// 通过地址下载文件downloadTheFile(strURL);// 显示更新状态，进度条showWaitDialog();}}).setNegativeButton("否", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {dialog.cancel();}}).show();}/** *  * 显示更新状态，进度条 */public void showWaitDialog() {dialog = new ProgressDialog(activity);dialog.setMessage("正在更新，请稍候...");dialog.setIndeterminate(true);dialog.setCancelable(true);dialog.show();}/** *  * 获得当前版本信息 */public void getCurrentVersion() {try {// 获取应用包信息PackageInfo info = activity.getPackageManager().getPackageInfo(activity.getPackageName(), 0);this.versionCode = info.versionCode;this.versionName = info.versionName;} catch (NameNotFoundException e) {e.printStackTrace();}}/** *  * 截取文件名称并执行下载 *  *  * @param strPath */private void downloadTheFile(final String strPath) {// 获得文件文件扩展名字符串fileEx = strURL.substring(strURL.lastIndexOf(".") + 1, strURL.length()).toLowerCase();// 获得文件文件名字符串fileNa = strURL.substring(strURL.lastIndexOf("/") + 1,strURL.lastIndexOf("."));try {if (strPath.equals(currentFilePath)) {doDownloadTheFile(strPath);}currentFilePath = strPath;new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubtry {// 执行下载doDownloadTheFile(strPath);} catch (Exception e) {Log.e(TAG, e.getMessage(), e);}}}).start();} catch (Exception e) {e.printStackTrace();}}/** *  * 执行新版本进行下载，并安装 *  *  * @param strPath *  * @throws Exception */private void doDownloadTheFile(String strPath) throws Exception {Log.i(TAG, "getDataSource()");// 判断strPath是否为网络地址if (!URLUtil.isNetworkUrl(strPath)) {Log.i(TAG, "服务器地址错误！");} else {URL myURL = new URL(strPath);URLConnection conn = myURL.openConnection();conn.connect();InputStream is = conn.getInputStream();if (is == null) {throw new RuntimeException("stream is null");}// 生成一个临时文件File myTempFile = File.createTempFile(fileNa, "." + fileEx);// 安装包文件临时路径currentTempFilePath = myTempFile.getAbsolutePath();FileOutputStream fos = new FileOutputStream(myTempFile);byte buf[] = new byte[128];do {int numread = is.read(buf);if (numread <= 0) {break;}fos.write(buf, 0, numread);} while (true);Log.i(TAG, "getDataSource() Download ok...");dialog.cancel();dialog.dismiss();// 打开文件openFile(myTempFile);try {is.close();} catch (Exception ex) {Log.e(TAG, "getDataSource() error: " + ex.getMessage(), ex);}}}/** *  * 打开文件进行安装 *   */private void openFile(File f) {Intent intent = new Intent();intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setAction(android.content.Intent.ACTION_VIEW);// 获得下载好的文件类型String type = getMIMEType(f);// 打开各种类型文件intent.setDataAndType(Uri.fromFile(f), type);// 安装activity.startActivity(intent);}/** *  * 删除临时路径里的安装包 */public void delFile() {Log.i(TAG, "The TempFile(" + currentTempFilePath + ") was deleted.");File myFile = new File(currentTempFilePath);if (myFile.exists()) {myFile.delete();}}/** *  * 获得下载文件的类型 *  *  * @param f *  *            文件名称 *  * @return 文件类型 */private String getMIMEType(File f) {String type = "";// 获得文件名称String fName = f.getName();// 获得文件扩展名String end = fName.substring(fName.lastIndexOf(".") + 1, fName.length()).toLowerCase();if (end.equals("m4a") || end.equals("mp3") || end.equals("mid")|| end.equals("xmf") || end.equals("ogg") || end.equals("wav")) {type = "audio";} else if (end.equals("3gp") || end.equals("mp4")) {type = "video";} else if (end.equals("jpg") || end.equals("gif") || end.equals("png")|| end.equals("jpeg") || end.equals("bmp")) {type = "image";} else if (end.equals("apk")) {type = "application/vnd.android.package-archive";} else {type = "*";}if (end.equals("apk")) {} else {type += "/*";}return type;}}