Android的版本更新

在AndroidManifest.xml中可以看到项目的版本号versionCode和版本名称versionName。其中版本号是整型数字 是我们用来判断是否更新的依据，版本名称是字符串 用来显示给用户看的

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    package="包名"    android:versionCode="2"    android:versionName="1.0.2">

实现思路：在本地或者服务器上放一个version.xml文件，这里以放到网络上为例，由于xml文件比较小，因此用DOM解析，解析后获得版本号与从AndroidManifest.xml中获取的版本号进行比对。

实现方法：为了方便开发，将更新时需要用到的方法写了一个UndateManagerService的类

public class UpdateManagerService {/* 获取远程配置文件结束 */private static final int GETREMOTEXML_FINISH = 1;/* 获取远程配置文件失败 */private static final int GETREMOTEXML_FAIL = 2;/* 下载结束 */private static final int FIND_NEW_UPDATE = 3;/* 下载结束 */private static final int NO_NEW_UPDATE = 4;/* 下载中 */private static final int DOWNLOAD = 5;/* 下载结束 */private static final int DOWNLOAD_FINISH = 6;/* 保存解析的XML信息 */HashMap<String, String> mHashMap = null;/* 下载保存路径 */private String mSavePath;/* 是否取消更新 */private boolean cancelUpdate = false;private Context mContext;private ProgressDialog pBar;private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case GETREMOTEXML_FINISH:break;case GETREMOTEXML_FAIL:break;case FIND_NEW_UPDATE:break;case NO_NEW_UPDATE:PromptUtil.show(mContext, "当前已是最新版！");break;// 正在下载case DOWNLOAD:break;case DOWNLOAD_FINISH:// 安装文件installApk();break;default:break;}};};public UpdateManagerService(Context context) {this.mContext = context;}/** * 检测软件更新 * * @throws IOException * @throws NotFoundException */public void checkUpdate_Active(){new Thread(new Runnable() {@Overridepublic void run() {if(getRemoteXML()){if (isUpdate()) {Looper.prepare();showNoticeDialog(); //显示提示对话框Looper.loop();Log.d("消息", "有新版本");} else {Log.d("消息", "已是最新版本");}}else {Log.d("消息", "获取远程版本配置文件失败");}}}).start();//Looper.prepare();//new ParseXmlService().start();//Looper.loop();}/** * 检测软件更新 * * @throws IOException * @throws NotFoundException */public void checkUpdate_Passive(){new Thread(new Runnable() {@Overridepublic void run() {if(getRemoteXML()){if (isUpdate()) {Looper.prepare();showNoticeDialog(); //显示提示对话框Looper.loop();Log.d("消息", "有新版本");} else {mHandler.sendEmptyMessage(NO_NEW_UPDATE);Log.d("消息", "已是最新版本");}}else {mHandler.sendEmptyMessage(GETREMOTEXML_FAIL);Log.d("消息", "获取远程版本配置文件失败");}}}).start();//Looper.prepare();//new ParseXmlService().start();//Looper.loop();}private boolean getRemoteXML(){// 将version.xml放在apk本地,则使用以下语句// InputStream inStream = ParseXmlService.class.getClassLoader().getResourceAsStream("http://imp.ctone.net/Frame/version.xml");// 把version.xml放到网络上，然后获取文件信息// 解析XML文件。 由于XML文件比较小，因此使用DOM方式进行解析ParseXmlService service = new ParseXmlService();try {URL url = new URL("http://..._version.xml");HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();InputStream inStream = urlConn.getInputStream();mHashMap = service.parseXml(inStream);} catch (MalformedURLException e) {e.printStackTrace();return false;}catch (IOException e) {e.printStackTrace();return false;} catch (Exception e) {e.printStackTrace();return false;}if(mHashMap != null && mHashMap.size() != 0){return true;} else {return false;}}/** * 检查软件是否有更新版本 * * @return * @throws IOException */private boolean isUpdate(){// 获取当前软件版本int versionCode = getVersionCode(mContext);if (null != mHashMap) {int serviceCode = Integer.valueOf(mHashMap.get("versionCode"));Log.i("-----serviceCode", "" + serviceCode);Log.i("-----versionCode", "" + versionCode);// 版本判断if (serviceCode > versionCode) {return true;}} else {Log.i("-----null == mHashMap", "null == mHashMap");}return false;}/** * 获取软件版本号 * * @param context * @return */private int getVersionCode(Context context) {int versionCode = 0;try {// 获取软件版本号，对应AndroidManifest.xml下android:versionCodeversionCode = context.getPackageManager().getPackageInfo("cn.jkjndoctor", 0).versionCode;} catch (NameNotFoundException e) {e.printStackTrace();}return versionCode;}/** * 显示软件更新对话框 */private void showNoticeDialog() {// 构造对话框AlertDialog.Builder builder = new Builder(mContext);builder.setTitle("有新版本需要更新");builder.setMessage(mHashMap.get("versionMsg").replace("\\n","\n"));// 更新builder.setPositiveButton("立即更新",new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();// 显示下载对话框showDownloadDialog();}});// 稍后更新builder.setNegativeButton("稍后更新",new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});//禁止返回键 如不需要可以不加builder.setCancelable(false);builder.setOnKeyListener(new DialogInterface.OnKeyListener() {@Overridepublic boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event){if (keyCode == KeyEvent.KEYCODE_SEARCH){return true;}else{return false; //默认返回 false}}});Dialog noticeDialog = builder.create();noticeDialog.show();}/** * 显示软件下载对话框 */private void showDownloadDialog() {pBar = new ProgressDialog(mContext);    //进度条，在下载的时候实时更新进度，提高用户友好度pBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);pBar.setTitle("正在下载");pBar.setMessage("请稍候...");pBar.setProgress(0);pBar.show();pBar.setCancelable(false);pBar.setOnKeyListener(new DialogInterface.OnKeyListener() {@Overridepublic boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event){if (keyCode == KeyEvent.KEYCODE_SEARCH){return true;}else{return false; //默认返回 false}}});// 下载文件downloadApk();}/** * 下载apk文件 */private void downloadApk() {cancelUpdate = false;// 启动新线程下载软件new downloadApkThread().start();}/** * 下载文件线程 */private class downloadApkThread extends Thread {@Overridepublic void run() {try {// 判断SD卡是否存在，并且是否具有读写权限if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {// 获得存储卡的路径String sdpath = Environment.getExternalStorageDirectory() + "/";mSavePath = sdpath + "download";URL url = new URL(mHashMap.get("url"));// 创建连接HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.connect();// 获取文件大小int length = conn.getContentLength();pBar.setMax(length);// 创建输入流InputStream is = conn.getInputStream();File file = new File(mSavePath);// 判断文件目录是否存在if (!file.exists()) {file.mkdir();}File apkFile = new File(mSavePath, mHashMap.get("name"));FileOutputStream fos = new FileOutputStream(apkFile);int count = 0;// 缓存byte buf[] = new byte[1024];// 写入到文件中do {int numread = is.read(buf);count += numread;pBar.setProgress(count);       //这里就是关键的实时更新进度了！//// 更新进度//mHandler.sendEmptyMessage(DOWNLOAD);if (numread <= 0) {// 下载完成mHandler.sendEmptyMessage(DOWNLOAD_FINISH);break;}// 写入文件fos.write(buf, 0, numread);} while (!cancelUpdate);// 点击取消就停止下载.fos.close();is.close();}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}// 取消下载对话框显示pBar.cancel();}}/** * 安装APK文件 */private void installApk() {File apkfile = new File(mSavePath, mHashMap.get("name"));if (!apkfile.exists()) {return;}// 通过Intent安装APK文件Intent i = new Intent(Intent.ACTION_VIEW);i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");mContext.startActivity(i);}/** * 获取远程版本配置文件 */public class ParseXmlService{public HashMap<String, String> parseXml(InputStream inStream) throws Exception{HashMap<String, String> hashMap = new HashMap<String, String>();String tmpStr;// 实例化一个文档构建器工厂DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();// 通过文档构建器工厂获取一个文档构建器DocumentBuilder builder = factory.newDocumentBuilder();// 通过文档通过文档构建器构建一个文档实例Document document = builder.parse(inStream);//获取XML文件根节点Element root = document.getDocumentElement();//获得所有子节点NodeList childNodes = root.getChildNodes();for (int j = 0; j < childNodes.getLength(); j++){//遍历子节点Node childNode = (Node) childNodes.item(j);if (childNode.getNodeType() == Node.ELEMENT_NODE){Element childElement = (Element) childNode;//版本号if ("versionCode".equals(childElement.getNodeName())){hashMap.put("versionCode",childElement.getFirstChild().getNodeValue());}//软件版本名else if (("versionName".equals(childElement.getNodeName()))){hashMap.put("versionName",childElement.getFirstChild().getNodeValue());}//更新信息else if (("versionMsg".equals(childElement.getNodeName()))){tmpStr = childElement.getFirstChild().getNodeValue();hashMap.put("versionMsg",tmpStr==null?"":tmpStr);}//文件名else if (("name".equals(childElement.getNodeName()))){hashMap.put("name",childElement.getFirstChild().getNodeValue());}//下载地址else if (("url".equals(childElement.getNodeName()))){hashMap.put("url",childElement.getFirstChild().getNodeValue());}}}return hashMap;}}}

在调用检查更新的方法时

private UpdateManagerService mUpdateManagerService;

mUpdateManagerService = new UpdateManagerService(this);

mUpdataManagerService.checkUpdate_Active();

附：..version.xml样板

<update>

<versionCode>2</versionCode>

<versionName>1.0.2</versionName>

<versionMsg>1:优化界面显示。\n2:修改已知BUG。</versionMsg>

<name>xx-release-v1.0.2.apk</name>

<url>

http://.../xx-release-v1.0.2.apk

</url>

</update>