Android如何更新app的版本（中级）

Android 如何更新 app 的版本（中级） 版本更新看看我们要用到哪些技术 1 自定义通知栏 2 HTTP 下载 3 AsyncTask 4 刷新通知栏中的进度条 5 执行 apk安装的隐士意图 6 Toast 7签名(安装时系统会自动检测签名是否一致) 8获得服务端和客户端的版本号上代码 (1)点击事件判断是否有新版本更新(2)自定义一个通知同时刷新下载进度 (3) 异步下载新版本app (4) 隐士意图来安装首先别忘了写权限！！！！！超爱忘得东西恨死它了 <uses-permission android:name="android.permission.INTERNET"></uses-permission> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission> <uses-permission android:name="android.permission.INSTALL_PACKAGES"></uses-permission> private Runnable mrun; private NotificationManager mNotificationManager; private Notification notification; private RemoteViews remoteviews; private intcount; private int loadversion; private int version; //升级按钮点击事件的方法通过服务器来解析JSON 得到版本号判断是否来通知下载 private void upgrade() { PackageManager nPackageManager=getPackageManager();//得到包管理器 try { PackageInfo nPackageInfo=nPackageManager .getPackageInfo(getPackageName(),PackageManager. GET_CONFIGURATIONS ); loadversion=nPackageInfo.versionCode;//得到现在 app的版本号 } catch (NameNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } //服务器端通过GET 得到JSON String json=JSandBitmap.httpGetDemo("http://192.168.14.234/version.json"); try { JSONArray jsonArray= new JSONArray(json); JSONObject jsonObject=jsonArray.getJSONObject(0); version = jsonObject.getInt("version");//得到服务端的 app版本号 } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } if((loadversion<version)){//如果有新版本发送通知开始下载 sendNotification(); } else{ //如果没有弹出对话框告知用户 new AlertDialog.Builder( this) .setTitle("update cancel") .setMessage("Sorry Not new Version ") .setNegativeButton("cencel", null).show(); } } //此方法来发送下载通知采用的是自定义通知栏并且更加下载的进度来刷新进度条 //自定义通知的方法在上上篇的博文中这里不做太多的解释 private void sendNotification() { mNotificationManager = (NotificationManager) getSystemService(Context. NOTIFICATION_SERVICE); notification = new Notification( R.drawable. player_play_light, "Midiplay", System.currentTimeMillis()); remoteviews= new RemoteViews("com.tarena.gsd110623.midiplayonline", R.layout. mynotiifcation); remoteviews.setImageViewResource(R.id. imageView1, R.drawable. a00); notification.contentView=remoteviews; Intent intent= new Intent( this,install. class);//PendingIntent 调用的系统的安装隐士意图后面红色的代码 PendingIntent pendingintent=PendingIntent.getActivity( this, 0, intent, 0); notification.contentIntent=pendingintent; mrun= new Runnable() {//这个Runnable 用来根据下载进度来刷新进度条 @Override public void run() { if(count<98){//紫色的count 是异步下载计算出来设置进度的值 remoteviews.setProgressBar(R.id. progressBar1, 100, count, false); remoteviews.setTextViewText(R.id. textView1, count+"%"); mNotificationManager.notify(8888, notification); handler.postDelayed(mrun, 300); } else{//这里计算出来的count 不是那么准确所以下载完成后给一个固定值做为下载完成 remoteviews.setProgressBar(R.id. progressBar1, 100, 100, false); remoteviews.setTextViewText(R.id. textView1, 100+"%"); mNotificationManager.notify(8888, notification); Toast.makeText(Welcome. this, "download over", Toast. LENGTH_SHORT);//提示用户下载成功 } } }; handler.postDelayed(mrun, 300); Update_AsyncTask mUpdate_AsyncTask= new Update_AsyncTask(); try {//启动下载 mUpdate_AsyncTask.execute( new URL("http://192.168.14.234/android_project_midiplayonline.apk")); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //这个内部类用来异步下载新版本 app 通过服务端下载这里不多说了 class Update_AsyncTask extends AsyncTask<URL, Integer, Object>{ @Override protected Object doInBackground(URL... params) { // TODO Auto-generated method stub try { URLConnection con = params[0].openConnection(); if (HttpURLConnection. HTTP_OK != ((HttpURLConnection)con).getResponseCode()) { Log.i("Main", "connection failed"); return null; } InputStream is = con.getInputStream(); int contentlength=con.getContentLength();//得到下载的总长度 System. out.println(contentlength); File file= new File(Constant. APK_FILE_PATH); if(!file.exists()){ file.getParentFile().mkdirs(); file.createNewFile(); } FileOutputStream out= new FileOutputStream(file); int current = 0; int x=0; byte[]arr= new byte[1024]; while ( (current = is.read(arr)) != -1 ){ out.write(arr, 0, current); x=x+current; count=( int)(100*x/contentlength);//计算下载的百分百 } is.close(); } catch (Exception e) { } return null; } } /* * 此类为系统安装的隐士意图 */ public class install extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); Intent notify_Intent = new Intent(Intent.ACTION_VIEW); notify_Intent.setDataAndType(Uri.fromFile(new File(Constant.APK_FILE_PATH)), "application/vnd.android.package-archive"); startActivity(notify_Intent); //取消上一个通知 NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); nm.cancel(8888); overridePendingTransition(0, 0); finish(); } } 效果如下

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