How to Implement the automatic update function of Android software

I believe that all users have encountered Software Update reminders. This function will be implemented below

First, let's take a look at the program directory structure.

Steps:

1. Create an UpdateManger class to display the update prompt.

Copy codeThe Code is as follows: public class UpdateManger {
// Application Context
Private Context mContext;
// Prompt message
Private String updateMsg = "you have the latest software package. Please download it! ";
// Download the network path of the installation package
Private String apkUrl = "http://softfile.3g.qq.com: 8080/msoft/179/24659/43549/qq_hd_mini_1.4.apk ";
Private Dialog noticeDialog; // a prompt box Indicating software update is displayed.
Private Dialog downloadDialog; // Download Dialog Box
Private static final String savePath = "/sdcard/updatedemo/"; // Save the apk folder
Private static final String saveFileName = savePath + "UpdateDemoRelease.apk ";
// Progress bar and handler and msg constants that notify the UI to refresh
Private ProgressBar mProgress;
Private static final int DOWN_UPDATE = 1;
Private static final int DOWN_OVER = 2;

Private int progress; // current progress
Private Thread downLoadThread; // download Thread
Private boolean interceptFlag = false; // The user cancels the download.
// Handler of the notification processing refresh Interface
Private Handler mHandler = new Handler (){
@ SuppressLint ("HandlerLeak ")
@ Override
Public void handleMessage (Message msg ){
Switch (msg. what ){
Case DOWN_UPDATE:
MProgress. setProgress (progress );
Break;
Case DOWN_OVER:
InstallApk ();
Break;
}
Super. handleMessage (msg );
}
};
Public UpdateManger (Context context ){
This. mContext = context;
}
// Display the update program dialog box for the main program to call
Public void checkUpdateInfo (){
ShowNoticeDialog ();
}
Private void showNoticeDialog (){
Android. app. AlertDialog. Builder builder = new android. app. AlertDialog. Builder (
MContext); // Builder. You can use this builder to change the default theme style and Attribute-related information of AleartDialog.
Builder. setTitle ("Software Version Update ");
Builder. setMessage (updateMsg );
Builder. setPositiveButton ("Download", new OnClickListener (){
@ Override
Public void onClick (DialogInterface dialog, int which ){
Dialog. dismiss (); // when the dialog box is canceled, do you want to operate the code? Cancel dialog box
ShowDownloadDialog ();
}
});
Builder. setNegativeButton ("later", new OnClickListener (){
@ Override
Public void onClick (DialogInterface dialog, int which ){
Dialog. dismiss ();
}
});
NoticeDialog = builder. create ();
NoticeDialog. show ();
}
Protected void showDownloadDialog (){
Android. app. AlertDialog. Builder builder = new android. app. AlertDialog. Builder (mContext );
Builder. setTitle ("Software Version Update ");
Final LayoutInflater inflater = LayoutInflater. from (mContext );
View v = inflater. inflate (R. layout. progress, null );
MProgress = (ProgressBar) v. findViewById (R. id. progress );
Builder. setView (v); // set the content of the dialog box to a View
Builder. setNegativeButton ("cancel", new OnClickListener (){
@ Override
Public void onClick (DialogInterface dialog, int which ){
Dialog. dismiss ();
InterceptFlag = true;
}
});
DownloadDialog = builder. create ();
DownloadDialog. show ();
DownloadApk ();
}
Private void downloadApk (){
DownLoadThread = new Thread (mdownApkRunnable );
DownLoadThread. start ();
}
Protected void installApk (){
File apkfile = new File (saveFileName );
If (! Apkfile. exists ()){
Return;
}
Intent I = new Intent (Intent. ACTION_VIEW );
I. setDataAndType (Uri. parse ("file: //" + apkfile. toString ()),
"Application/vnd. android. package-archive"); // File. toString () will return the path information
MContext. startActivity (I );
}
Private Runnable mdownApkRunnable = new Runnable (){
@ Override
Public void run (){
URL url;
Try {
Url = new URL (apkUrl );
HttpURLConnection conn = (HttpURLConnection) url. openConnection ();
Conn. connect ();
Int length = conn. getContentLength ();
InputStream ins = conn. getInputStream ();
File file = new File (savePath );
If (! File. exists ()){
File. mkdir ();
}
String apkFile = saveFileName;
File ApkFile = new File (apkFile );
FileOutputStream outStream = new FileOutputStream (ApkFile );
Int count = 0;
Byte buf [] = new byte [1024];
Do {
Int numread = ins. read (buf );
Count + = numread;
Progress = (int) (float) count/length) * 100 );
// Download progress
MHandler. sendEmptyMessage (DOWN_UPDATE );
If (numread <= 0 ){
// Download completion notification Installation
MHandler. sendEmptyMessage (DOWN_OVER );
Break;
}
OutStream. write (buf, 0, numread );
} While (! InterceptFlag); // click Cancel to stop the download.
OutStream. close ();
Ins. close ();
} Catch (Exception e ){
E. printStackTrace ();
}
}
};
}

2. Create an xml file to define the progress of the ProgressBar during the download process, named progress. xml
Copy codeThe Code is as follows: <? Xml version = "1.0" encoding = "UTF-8"?>
<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content">

<ProgressBar
Android: id = "@ + id/progress"
Style = "? Android: attr/progressBarStyleHorizontal"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"/>

</LinearLayout>

3. Check for software updates in the onCreate () method of MainActivity

MUpdateManger = new UpdateManger (MainActivity. this); // note that getApplicationContext () cannot be input here; an error is returned because only one Activity can add a form.
MUpdateManger. checkUpdateInfo ();

And add the network permission to the configuration list file <uses-permission android: name = "android. permission. INTERNET"/>

4. Run the program

-- Click to download -->