Android automatically updates apps

Android automatically updates apps

Currently, General android software is constantly updated. when you open an app, if there is a new version, it will prompt you that a new version needs to be updated. The applet implements this function.

A prompt box will pop up when there is an update. Click OK to create a progress bar in the notification for download. Click Cancel to cancel the update.

The following code details:

1. Create the layout file icationication_item.xml to generate a progress bar and a download icon in the notification bar.

 

2. Create an AppContext class that inherits from the Application.

 

 

Package com. test. application; import android. app. application; import android. content. context; import com. test. update. config. config; public class AppContext extends Application {private static AppContext appInstance; private Context context; public static AppContext getInstance () {return appInstance ;}@ Overridepublic void onCreate () {// TODO Auto-generated method stubsuper. onCreate (); appInstance = this; context = this. getBaseContext (); // get the current version number // try {// PackageInfo packageInfo = getApplicationContext ()//. getPackageManager (). getPackageInfo (getPackageName (), 0); // Config. localVersion = packageInfo. versionCode; // Config. serverVersion = 1; // assume that the server version is 2 and the local version is 1 by default. //} catch (NameNotFoundException e) {// e. printStackTrace (); //} initGlobal ();} public void initGlobal () {try {Config. localVersion = getPackageManager (). getPackageInfo (getPackageName (), 0 ). versionCode; // set the local version number Config. serverVersion = 2; // assume that the server version is 2 and the local version is 1 by default. In actual development, the latest version is obtained from the server, for more information about the interaction between android and the backend, see my other blog.} catch (Exception ex) {ex. printStackTrace ();}}}

3. Create a configuration file class Config. java, which defines some version-related constants.

 

 

Package com. test. update. config; public class Config {// version information public static int localVersion = 0; public static int serverVersion = 0; /* download package installation path */public static final String savePath =/sdcard/test/; public static final String saveFileName = savePath + test.apk ;}

 

4. Compile UpdateServcie. java

 

Package com. test. update; import java. io. file; import java. io. fileOutputStream; import java. io. inputStream; import java.net. httpURLConnection; import java.net. URL; import android. annotation. suppressLint; import android. app. notification; import android. app. icationicationmanager; import android. app. pendingIntent; import android. app. service; import android. content. intent; import android.net. uri; import android. OS. env Ironment; import android. OS. handler; import android. OS. IBinder; import android. OS. message; import android. widget. remoteViews; import com. test. update. config. config; public class UpdateService extends Service {// Title private int titleId = 0; // File storage private File updateDir = null; private File updateFile = null; // Download Status private final static int DOWNLOAD_COMPLETE = 0; private final static int DOWNLOAD_FAIL = 1; // pass Private icationicationmanager updateNotificationManager = null; private Notification updateNotification = null; // The Notification bar jumps to Intentprivate Intent updateIntent = null; private PendingIntent updatePendingIntent = null; /***** create a notification bar */RemoteViews contentView; // there are a lot of such download code, so I will not explain too much int downloadCount = 0; int currentSize = 0; long totalSize = 0; int updateTotalSize = 0; // prepare the download task in the onStartCommand () method: @ SuppressWarn Ings (deprecation) @ Overridepublic int onStartCommand (Intent intent, int flags, int startId) {// get the passed value titleId = intent. getIntExtra (titleId, 0); // create a file if (android. OS. environment. MEDIA_MOUNTED.equals (android. OS. environment. getExternalStorageState () {updateDir = new File (Environment. getExternalStorageDirectory (), Config. saveFileName); updateFile = new File (updateDir. getPath (), getResources (). getString (t ItleId) +. apk);} this. updateNotificationManager = (icationicationmanager) getSystemService (NOTIFICATION_SERVICE); this. updateNotification = new Notification (); // you can click the Notification bar to return to the main interface updateIntent = new Intent (this, UpdateActivity. class); updatePendingIntent = PendingIntent. getActivity (this, 0, updateIntent, 0); // sets the content updateNotification in the notification bar. icon = R. drawable. ic_launcher; updateNotification. tickerText = start Download; updateNotification. setLatestEventInfo (this, QQ, 0%, updatePendingIntent); // send a notification to updateNotificationManager. Y (0, updateNotification); // enable a new thread for downloading. If you use the Service for Synchronous downloading, this will cause ANR problems, the Service itself also blocks new Thread (new updateRunnable ()). start (); // This is the focus of the download, and is the return super. onStartCommand (intent, flags, startId) ;}@ Overridepublic IBinder onBind (Intent arg0) {// TODO Auto-generated method stubreturn null;} @ Suppr EssLint (HandlerLeak) private Handler updateHandler = new Handler () {@ Overridepublic void handleMessage (Message msg) {switch (msg. what) {case DOWNLOAD_COMPLETE: // click to install PendingIntentUri = uri. fromFile (updateFile); Intent installIntent = new Intent (Intent. ACTION_VIEW); installIntent. setDataAndType (uri, application/vnd. android. package-archive); updatePendingIntent = PendingIntent. getActivity (UpdateServi Ce. this, 0, installIntent, 0); updateNotification. defaults = Notification. DEFAULT_SOUND; // ringtone Notification updateNotification. setLatestEventInfo (UpdateService. this, QQ, download complete, click Install ., UpdatePendingIntent); updateNotificationManager. Y (0, updateNotification); // stop the service stopService (updateIntent); case DOWNLOAD_FAIL: // download failed updateNotification. setLatestEventInfo (UpdateService. this, QQ, download complete, click to install ., UpdatePendingIntent); updateNotificationManager. Y (0, updateNotification); default: stopService (updateIntent) ;}}; public long downloadUpdateFile (String downloadUrl, File saveFile) throws Exception {HttpURLConnection httpConnection = null; inputStream is = null; FileOutputStream fos = null; try {URL url = new URL (downloadUrl); httpConnection = (HttpURLConnection) url. openConnection (); httpConnection. set RequestProperty (User-Agent, PacificHttpClient); if (currentSize> 0) {httpConnection. setRequestProperty (RANGE, bytes = + currentSize +-);} httpConnection. setConnectTimeout (10000); httpConnection. setReadTimeout (20000); updateTotalSize = httpConnection. getContentLength (); if (httpConnection. getResponseCode () = 404) {throw new Exception (fail !);} Is = httpConnection. getInputStream (); fos = new FileOutputStream (saveFile, false); byte buffer [] = new byte [4096]; int readsize = 0; while (readsize = is. read (buffer)> 0) {fos. write (buffer, 0, readsize); totalSize + = readsize; // to Prevent the application from being tightened due to frequent notifications, if (downloadCount = 0) is notified only once when the percentage increases by 10) | (int) (totalSize * 100/updateTotalSize)-10> downloadCount) {downloadCount + = 10; updateNotification. setlatesteven Ti Nfo (UpdateService. this, is being downloaded, (int) totalSize * 100/updateTotalSize + %, updatePendingIntent);/***** here we use a custom view to display Notification */updateNotification. contentView = new RemoteViews (getPackageName (), R. layout. notification_item); updateNotification. contentView. setTextViewText (R. id. notificationTitle, being downloaded); updateNotification. contentView. setProgressBar (R. id. icationicationss, 100, downloadCount, fal Se); updateNotificationManager. Y (0, updateNotification) ;}} finally {if (httpConnection! = Null) {httpConnection. disconnect ();} if (is! = Null) {is. close () ;}if (fos! = Null) {fos. close () ;}} return totalSize;} class updateRunnable implements Runnable {Message message = updateHandler. obtainMessage (); public void run () {message. what = DOWNLOAD_COMPLETE; try {// Add Permissions
 
  
; If (! UpdateDir. exists () {updateDir. mkdirs ();} if (! UpdateFile. exists () {updateFile. createNewFile () ;}// download the function, using QQ as an example // Add Permissions
  
   
; Long downloadSize = downloadUpdateFile (http://softfile.3g.qq.com: 8080/msoft/179/1105/10753/mobileqq1.0(android1__build0198.apk, updateFile); if (downloadSize> 0) {// download successful updateHandler. sendMessage (message) ;}} catch (Exception ex) {ex. printStackTrace (); message. what = DOWNLOAD_FAIL; // download failed updateHandler. sendMessage (message );}}}}
  
 

5. Write the activity class UpdateActivity

 

 

Package com. test. update; import com. test. update. config. config; import android. support. v4.app. fragment; import android. app. activity; import android. app. alertDialog; import android. content. dialogInterface; import android. content. intent; import android. OS. bundle; import android. util. log; import android. view. layoutInflater; public class UpdateActivity extends Activity {@ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); checkVersion ();}/*** check the updated version */public void checkVersion () {if (Config. localVersion <Config. serverVersion) {Log. I (hgncxzy, ============================ ); // when a new version is found, the user is prompted to update AlertDialog. builder alert = new AlertDialog. builder (this); alert. setTitle (software upgrade ). setMessage (the new version is found. We recommend that you update it immediately .). setPositiveButton (Update, new DialogInterface. onClickListener () {public void onClick (DialogInterface Diener, int which) {// enable the update Service UpdateService // to better modularize update, you can upload updateService dependent values // such as layout ID, resource ID, and dynamically obtained title. Here we use app_name as an example: Intent updateIntent = new Intent (UpdateActivity. this, UpdateService. class); updateIntent. putExtra (titleId, R. string. app_name); startService (updateIntent );}}). setNegativeButton (cancel, new DialogInterface. onClickListener () {public void onClick (DialogInterface diich, int which) {dialog. dismiss () ;}}); alert. create (). show ();} else {// cleanup, skipped // cheanUpdateFile ()}}}

6. add permissions and load the service statically (load in the configuration file ).