Android自动检测版本及自动升级
步骤:
1.检测当前版本的信息AndroidManifest.xml-->manifest-->android:versionName。
2.从服务器获取版本号(版本号存在于xml文件中)并与当前检测到的版本进行匹配,如果不匹配,提示用户进行升级,如果匹配则进入程序主界面。
3.当提示用户进行版本升级时,如果用户点击了确定,系统将自动从服务器上下载并进行自动升级,如果点击取消将进入程序主界面。
效果图:
获取当前程序的版本号:
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/*
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* 获取当前程序的版本号
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*/
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private String getVersionName() throws Exception{
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//获取packagemanager的实例
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PackageManager packageManager = getPackageManager();
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//getPackageName()是你当前类的包名,0代表是获取版本信息
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PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(), 0);
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return packInfo.versionName;
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}
获取服务器端的版本号:
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/*
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* 用pull解析器解析服务器返回的xml文件 (xml封装了版本号)
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*/
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public static UpdataInfo getUpdataInfo(InputStream is) throws Exception{
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XmlPullParser parser = Xml.newPullParser();
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parser.setInput(is, "utf-8");//设置解析的数据源
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int type = parser.getEventType();
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UpdataInfo info = new UpdataInfo();//实体
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while(type != XmlPullParser.END_DOCUMENT ){
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switch (type) {
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case XmlPullParser.START_TAG:
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if("version".equals(parser.getName())){
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info.setVersion(parser.nextText()); //获取版本号
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}else if ("url".equals(parser.getName())){
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info.setUrl(parser.nextText()); //获取要升级的APK文件
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}else if ("description".equals(parser.getName())){
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info.setDescription(parser.nextText()); //获取该文件的信息
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}
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break;
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}
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type = parser.next();
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}
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return info;
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}
从服务器下载apk:
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public static File getFileFromServer(String path, ProgressDialog pd) throws Exception{
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//如果相等的话表示当前的sdcard挂载在手机上并且是可用的
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if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
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URL url = new URL(path);
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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conn.setConnectTimeout(5000);
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//获取到文件的大小
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pd.setMax(conn.getContentLength());
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InputStream is = conn.getInputStream();
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File file = new File(Environment.getExternalStorageDirectory(), "updata.apk");
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FileOutputStream fos = new FileOutputStream(file);
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BufferedInputStream bis = new BufferedInputStream(is);
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byte[] buffer = new byte[1024];
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int len ;
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int total=0;
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while((len =bis.read(buffer))!=-1){
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fos.write(buffer, 0, len);
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total+= len;
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//获取当前下载量
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pd.setProgress(total);
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}
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fos.close();
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bis.close();
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is.close();
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return file;
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}
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else{
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return null;
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}
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}
匹配、下载、自动安装:
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/*
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* 从服务器获取xml解析并进行比对版本号
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*/
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public class CheckVersionTask implements Runnable{
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public void run() {
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try {
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//从资源文件获取服务器 地址
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String path = getResources().getString(R.string.serverurl);
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//包装成url的对象
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URL url = new URL(path);
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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conn.setConnectTimeout(5000);
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InputStream is =conn.getInputStream();
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info = UpdataInfoParser.getUpdataInfo(is);
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if(info.getVersion().equals(versionname)){
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Log.i(TAG,"版本号相同无需升级");
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LoginMain();
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}else{
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Log.i(TAG,"版本号不同 ,提示用户升级 ");
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Message msg = new Message();
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msg.what = UPDATA_CLIENT;
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handler.sendMessage(msg);
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}
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} catch (Exception e) {
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// 待处理
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Message msg = new Message();
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msg.what = GET_UNDATAINFO_ERROR;
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handler.sendMessage(msg);
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e.printStackTrace();
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}
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}
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}
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Handler handler = new Handler(){
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@Override
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public void handleMessage(Message msg) {
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// TODO Auto-generated method stub
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super.handleMessage(msg);
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switch (msg.what) {
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case UPDATA_CLIENT:
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//对话框通知用户升级程序
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showUpdataDialog();
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break;
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case GET_UNDATAINFO_ERROR:
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//服务器超时
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Toast.makeText(getApplicationContext(), "获取服务器更新信息失败", 1).show();
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LoginMain();
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break;
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case DOWN_ERROR:
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//下载apk失败
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Toast.makeText(getApplicationContext(), "下载新版本失败", 1).show();
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LoginMain();
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break;
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}
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}
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};
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/*
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*
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* 弹出对话框通知用户更新程序
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*
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* 弹出对话框的步骤:
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* 1.创建alertDialog的builder.
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* 2.要给builder设置属性, 对话框的内容,样式,按钮
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* 3.通过builder 创建一个对话框
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* 4.对话框show()出来
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*/
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protected void showUpdataDialog() {
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AlertDialog.Builder builer = new Builder(this) ;
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builer.setTitle("版本升级");
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builer.setMessage(info.getDescription());
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//当点确定按钮时从服务器上下载 新的apk 然后安装
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builer.setPositiveButton("确定", new OnClickListener() {
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public void onClick(DialogInterface dialog, int which) {
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Log.i(TAG,"下载apk,更新");
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downLoadApk();
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}
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});
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//当点取消按钮时进行登录
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builer.setNegativeButton("取消", new OnClickListener() {
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public void onClick(DialogInterface dialog, int which) {
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// TODO Auto-generated method stub
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LoginMain();
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}
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});
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AlertDialog dialog = builer.create();
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dialog.show();
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}
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/*
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* 从服务器中下载APK
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*/
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protected void downLoadApk() {
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final ProgressDialog pd; //进度条对话框
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pd = new ProgressDialog(this);
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pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
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pd.setMessage("正在下载更新");
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pd.show();
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new Thread(){
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@Override
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public void run() {
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try {
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File file = DownLoadManager.getFileFromServer(info.getUrl(), pd);
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sleep(3000);
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installApk(file);
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pd.dismiss(); //结束掉进度条对话框
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} catch (Exception e) {
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Message msg = new Message();
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msg.what = DOWN_ERROR;
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handler.sendMessage(msg);
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e.printStackTrace();
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}
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}}.start();
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}
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//安装apk
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protected void installApk(File file) {
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Intent intent = new Intent();
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//执行动作
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intent.setAction(Intent.ACTION_VIEW);
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//执行的数据类型
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intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
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startActivity(intent);
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}
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/*
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* 进入程序的主界面
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*/
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private void LoginMain(){
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Intent intent = new Intent(this,MainActivity.class);
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startActivity(intent);
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//结束掉当前的activity
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this.finish();
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}
UpdataInfo:
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public class UpdataInfo {
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private String version;
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private String url;
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private String description;
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public String getVersion() {
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return version;
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}
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public void setVersion(String version) {
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this.version = version;
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}
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public String getUrl() {
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return url;
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}
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public void setUrl(String url) {
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this.url = url;
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}
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public String getDescription() {
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return description;
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}
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public void setDescription(String description) {
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this.description = description;
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}
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}
update.xml:
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<?xml version="1.0" encoding="utf-8"?>
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<info>
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<version>2.0</version>
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<url>http://192.168.1.187:8080/mobilesafe.apk</url>
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<description>检测到最新版本,请及时更新!</description>
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</info>
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