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我们应该都有类似的使用体验，当一款APP需要更新是，进入界面会提醒有新的更新是否更新，这里有那么几个步骤
1、首先检测当前版本
2、判断服务器中版本
3、如果有更新则点击更新，下载安装包，下载完成后自动安装
具体代码怎么实现呢？下面我们一起看一下
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/* * 获取当前程序的版本号 */private String getVersionName() throws Exception{ //获取packagemanager的实例 PackageManager packageManager = getPackageManager(); //getPackageName()是你当前类的包名，0代表是获取版本信息 PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(), 0); return packInfo.versionName;} |
读取服务器版本号
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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) */public static UpdataInfo getUpdataInfo(InputStream is) throws Exception{ XmlPullParser parser = Xml.newPullParser(); parser.setInput(is, "utf-8");//设置解析的数据源 int type = parser.getEventType(); UpdataInfo info = new UpdataInfo();//实体 while(type != XmlPullParser.END_DOCUMENT ){ switch (type) { case XmlPullParser.START_TAG: if("version".equals(parser.getName())){ info.setVersion(parser.nextText()); //获取版本号 }else if ("url".equals(parser.getName())){ info.setUrl(parser.nextText()); //获取要升级的APK文件 }else if ("description".equals(parser.getName())){ info.setDescription(parser.nextText()); //获取该文件的信息 } break; } type = parser.next(); } return info;} |
下载
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public static File getFileFromServer(String path, ProgressDialog pd) throws Exception{ //如果相等的话表示当前的sdcard挂载在手机上并且是可用的 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); //获取到文件的大小 pd.setMax(conn.getContentLength()); InputStream is = conn.getInputStream(); File file = new File(Environment.getExternalStorageDirectory(), "updata.apk"); FileOutputStream fos = new FileOutputStream(file); BufferedInputStream bis = new BufferedInputStream(is); byte[] buffer = new byte[1024]; int len ; int total=0; while((len =bis.read(buffer))!=-1){ fos.write(buffer, 0, len); total+= len; //获取当前下载量 pd.setProgress(total); } fos.close(); bis.close(); is.close(); return file; } else{ return null; }} |
版本匹配、自动安装
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/* * 从服务器获取xml解析并进行比对版本号 */public class CheckVersionTask implements Runnable{ public void run() { try { //从资源文件获取服务器 地址 String path = getResources().getString(R.string.serverurl); //包装成url的对象 URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); InputStream is =conn.getInputStream(); info = UpdataInfoParser.getUpdataInfo(is); if(info.getVersion().equals(versionname)){ Log.i(TAG,"版本号相同无需升级"); LoginMain(); }else{ Log.i(TAG,"版本号不同 ,提示用户升级 "); Message msg = new Message(); msg.what = UPDATA_CLIENT; handler.sendMessage(msg); } } catch (Exception e) { // 待处理 Message msg = new Message(); msg.what = GET_UNDATAINFO_ERROR; handler.sendMessage(msg); e.printStackTrace(); } }}Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub super.handleMessage(msg); switch (msg.what) { case UPDATA_CLIENT: //对话框通知用户升级程序 showUpdataDialog(); break; case GET_UNDATAINFO_ERROR: //服务器超时 Toast.makeText(getApplicationContext(), "获取服务器更新信息失败", 1).show(); LoginMain(); break; case DOWN_ERROR: //下载apk失败 Toast.makeText(getApplicationContext(), "下载新版本失败", 1).show(); LoginMain(); break; } }};/* * * 弹出对话框通知用户更新程序 * * 弹出对话框的步骤： * 1.创建alertDialog的builder. * 2.要给builder设置属性, 对话框的内容,样式,按钮 * 3.通过builder 创建一个对话框 * 4.对话框show()出来 */protected void showUpdataDialog() { AlertDialog.Builder builer = new Builder(this) ; builer.setTitle("版本升级"); builer.setMessage(info.getDescription()); //当点确定按钮时从服务器上下载 新的apk 然后安装 builer.setPositiveButton("确定", new OnClickListener() { public void onClick(DialogInterface dialog, int which) { Log.i(TAG,"下载apk,更新"); downLoadApk(); } }); //当点取消按钮时进行登录 builer.setNegativeButton("取消", new OnClickListener() { public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub LoginMain(); } }); AlertDialog dialog = builer.create(); dialog.show();}/* * 从服务器中下载APK */protected void downLoadApk() { final ProgressDialog pd; //进度条对话框 pd = new ProgressDialog(this); pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); pd.setMessage("正在下载更新"); pd.show(); new Thread(){ @Override public void run() { try { File file = DownLoadManager.getFileFromServer(info.getUrl(), pd); sleep(3000); installApk(file); pd.dismiss(); //结束掉进度条对话框 } catch (Exception e) { Message msg = new Message(); msg.what = DOWN_ERROR; handler.sendMessage(msg); e.printStackTrace(); } }}.start();}//安装apkprotected void installApk(File file) { Intent intent = new Intent(); //执行动作 intent.setAction(Intent.ACTION_VIEW); //执行的数据类型 intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive"); startActivity(intent);}/* * 进入程序的主界面 */private void LoginMain(){ Intent intent = new Intent(this,MainActivity.class); startActivity(intent); //结束掉当前的activity this.finish();} |
相关类
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public class UpdataInfo { private String version; private String url; private String description; public String getVersion() { return version; } public void setVersion(String version) { this.version = version; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; }} |
相关布局
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<?xml version="1.0" encoding="utf-8"?><info> <version>2.0</version> <description>检测到最新版本，请及时更新！</description></info> |
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原文地址：http://www.cnblogs.com/zrui513/p/5010200.html
