1. 准备知识
在AndroidManifest.xml里定义了每个Android apk的版本标识: [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]<manifest xmlns:android="http://schemas.android.com/apk/res/android"
[size=1em] package="com.myapp"
[size=1em] android:versionCode="1"
[size=1em] android:versionName="1.0.0">
[size=1em]<application></application>
[size=1em]</manifest>
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其中,android:versionCode和android:versionName两个字段分别表示版本代码,版本名称。versionCode是 整型数字,versionName是字符串。由于version是给用户看的,不太容易比较大小,升级检查时,可以以检查versionCode为主,方 便比较出版本的前后大小。
那么,在应用中如何读取AndroidManifest.xml中的versionCode和versionName呢?可以使用PackageManager的API,参考以下代码: [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]public static int getVerCode(Context context) {
[size=1em] int verCode = -1;
[size=1em] try {
[size=1em] verCode = context.getPackageManager().getPackageInfo(
[size=1em] "com.myapp", 0).versionCode;
[size=1em] } catch (NameNotFoundException e) {
[size=1em] Log.e(TAG, e.getMessage());
[size=1em] }
[size=1em] return verCode;
[size=1em] }
[size=1em]
[size=1em] public static String getVerName(Context context) {
[size=1em] String verName = "";
[size=1em] try {
[size=1em] verName = context.getPackageManager().getPackageInfo(
[size=1em] "com.myapp", 0).versionName;
[size=1em] } catch (NameNotFoundException e) {
[size=1em] Log.e(TAG, e.getMessage());
[size=1em] }
[size=1em] return verName;
[size=1em]}
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或者在AndroidManifest中将android:versionName="1.2.0"写成 android:versionName="@string/app_versionName",然后在values/strings.xml中添加对应 字符串,这样实现之后,就可以使用如下代码获得版本名称: [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]public static String getVerName(Context context) {
[size=1em] String verName = context.getResources()
[size=1em] .getText(R.string.app_versionName).toString();
[size=1em] return verName;
[size=1em]}
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同理,apk的应用名称可以这样获得: [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]public static String getAppName(Context context) {
[size=1em] String verName = context.getResources()
[size=1em] .getText(R.string.app_name).toString();
[size=1em] return verName;
[size=1em]}
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2. 流程框架
3. 版本检查
在服务端放置最新版本的apk文件,如:http://localhost/myapp/myapp.apk
同时,在服务端放置对应此apk的版本信息调用接口或者文件,如:http://localhost/myapp/ver.json
ver.json中的内容为: [{"appname":"jtapp12","apkname":"jtapp-12-updateapksamples.apk","verName":1.0.1,"verCode":2}] 然后,在手机客户端上进行版本读取和检查: [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]private boolean getServerVer () {
[size=1em] try {
[size=1em] String verjson = NetworkTool.getContent(Config.UPDATE_SERVER
[size=1em] + Config.UPDATE_VERJSON);
[size=1em] JSONArray array = new JSONArray(verjson);
[size=1em] if (array.length() > 0) {
[size=1em] JSONObject obj = array.getJSONObject(0);
[size=1em] try {
[size=1em] newVerCode = Integer.parseInt(obj.getString("verCode"));
[size=1em] newVerName = obj.getString("verName");
[size=1em] } catch (Exception e) {
[size=1em] newVerCode = -1;
[size=1em] newVerName = "";
[size=1em] return false;
[size=1em] }
[size=1em] }
[size=1em] } catch (Exception e) {
[size=1em] Log.e(TAG, e.getMessage());
[size=1em] return false;
[size=1em] }
[size=1em] return true;
[size=1em] }
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比较服务器和客户端的版本,并进行更新操作。 [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]if (getServerVerCode()) {
[size=1em] int vercode = Config.getVerCode(this); // 用到前面第一节写的方法
[size=1em] if (newVerCode > vercode) {
[size=1em] doNewVersionUpdate(); // 更新新版本
[size=1em] } else {
[size=1em] notNewVersionShow(); // 提示当前为最新版本
[size=1em] }
[size=1em] }
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详细方法: [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]private void notNewVersionShow() {
[size=1em] int verCode = Config.getVerCode(this);
[size=1em] String verName = Config.getVerName(this);
[size=1em] StringBuffer sb = new StringBuffer();
[size=1em] sb.append("当前版本:");
[size=1em] sb.append(verName);
[size=1em] sb.append(" Code:");
[size=1em] sb.append(verCode);
[size=1em] sb.append(",/n已是最新版,无需更新!");
[size=1em] Dialog dialog = new AlertDialog.Builder(Update.this).setTitle("软件更新")
[size=1em] .setMessage(sb.toString())// 设置内容
[size=1em] .setPositiveButton("确定",// 设置确定按钮
[size=1em] new DialogInterface.OnClickListener() {
[size=1em] @Override
[size=1em] public void onClick(DialogInterface dialog,
[size=1em] int which) {
[size=1em] finish();
[size=1em] }
[size=1em] }).create();// 创建
[size=1em] // 显示对话框
[size=1em] dialog.show();
[size=1em]}
[size=1em]private void doNewVersionUpdate() {
[size=1em] int verCode = Config.getVerCode(this);
[size=1em] String verName = Config.getVerName(this);
[size=1em] StringBuffer sb = new StringBuffer();
[size=1em] sb.append("当前版本:");
[size=1em] sb.append(verName);
[size=1em] sb.append(" Code:");
[size=1em] sb.append(verCode);
[size=1em] sb.append(", 发现新版本:");
[size=1em] sb.append(newVerName);
[size=1em] sb.append(" Code:");
[size=1em] sb.append(newVerCode);
[size=1em] sb.append(", 是否更新?");
[size=1em] Dialog dialog = new AlertDialog.Builder(Update.this)
[size=1em] .setTitle("软件更新")
[size=1em] .setMessage(sb.toString())
[size=1em] // 设置内容
[size=1em] .setPositiveButton("更新",// 设置确定按钮
[size=1em] new DialogInterface.OnClickListener() {
[size=1em] @Override
[size=1em] public void onClick(DialogInterface dialog,
[size=1em] int which) {
[size=1em] pBar = new ProgressDialog(Update.this);
[size=1em] pBar.setTitle("正在下载");
[size=1em] pBar.setMessage("请稍候...");
[size=1em] pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
[size=1em] downFile(Config.UPDATE_SERVER + Config.UPDATE_APKNAME);
[size=1em] }
[size=1em] })
[size=1em] .setNegativeButton("暂不更新",
[size=1em] new DialogInterface.OnClickListener() {
[size=1em] public void onClick(DialogInterface dialog,
[size=1em] int whichButton) {
[size=1em] // 点击"取消"按钮之后退出程序
[size=1em] finish();
[size=1em] }
[size=1em] }).create();// 创建
[size=1em] // 显示对话框
[size=1em] dialog.show();
[size=1em]}
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4. 下载模块 注,本部分参考了前人的相关实现,见 http://apps.hi.baidu.com/share/detail/24172508 [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]void downFile(final String url) {
[size=1em]pBar.show();
[size=1em]new Thread() {
[size=1em] public void run() {
[size=1em] HttpClient client = new DefaultHttpClient();
[size=1em] HttpGet get = new HttpGet(url);
[size=1em] HttpResponse response;
[size=1em] try {
[size=1em] response = client.execute(get);
[size=1em] HttpEntity entity = response.getEntity();
[size=1em] long length = entity.getContentLength();
[size=1em] InputStream is = entity.getContent();
[size=1em] FileOutputStream fileOutputStream = null;
[size=1em] if (is != null) {
[size=1em] File file = new File(
[size=1em] Environment.getExternalStorageDirectory(),
[size=1em] Config.UPDATE_SAVENAME);
[size=1em] fileOutputStream = new FileOutputStream(file);
[size=1em] byte[] buf = new byte[1024];
[size=1em] int ch = -1;
[size=1em] int count = 0;
[size=1em] while ((ch = is.read(buf)) != -1) {
[size=1em] fileOutputStream.write(buf, 0, ch);
[size=1em] count += ch;
[size=1em] if (length > 0) {
[size=1em] }
[size=1em] }
[size=1em] }
[size=1em] fileOutputStream.flush();
[size=1em] if (fileOutputStream != null) {
[size=1em] fileOutputStream.close();
[size=1em] }
[size=1em] down();
[size=1em] } catch (ClientProtocolException e) {
[size=1em] e.printStackTrace();
[size=1em] } catch (IOException e) {
[size=1em] e.printStackTrace();
[size=1em] }
[size=1em] }
[size=1em]}.start();
[size=1em]}
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下载完成,通过handler通知主ui线程将下载对话框取消。 [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]void down() {
[size=1em] handler.post(new Runnable() {
[size=1em] public void run() {
[size=1em] pBar.cancel();
[size=1em] update();
[size=1em] }
[size=1em] });
[size=1em]}
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5. 安装应用 [size=1em][backcolor=rgb(108, 226, 108) !important][color=white !important][size=1em] ?
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| [size=1em][size=1em]<strong> void update() {
[size=1em] Intent intent = new Intent(Intent.ACTION_VIEW);
[size=1em] intent.setDataAndType(Uri.fromFile(new File(Environment
[size=1em] .getExternalStorageDirectory(), Config.UPDATE_SAVENAME)),
[size=1em] "application/vnd.android.package-archive");
[size=1em] startActivity(intent);
[size=1em] }</strong>
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如果你将apk应用发布到market上,那么,你会发现market内建了类似的模块,可以自动更新或者提醒你是否更新应用。那么,对于你自己的 应用需要自动更新的话,自己内建一个是不是更加方便了呢?本文提到的代码大多是在UpdateActivity.java中实现,为了能够使更新过程更加 友好,可以在最初launcher的Activity中建立一个线程,用来检查服务端是否有更新。有更新的时候就启动UpdateActivity,这样 的使用体验更加平滑。
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