Introduction to the method of downloading and automatic installation of apk in Android

Mobile phone file download is divided into the background of automatic download and foreground download, I summed up the implementation of these two code, where the foreground download and realize the download progress bar implementation.

The first type: Background download

/**
* Background in the following one apk download completed to return the downloaded file
*
* @param httpurl
* @return
*/
Private File downfile (final String httpurl) {

New Thread (New Runnable () {

@Override
public void Run () {
try {
URL url = new URL (httpurl);
HttpURLConnection connection = (httpurlconnection) url.openconnection ();
Connection.setrequestmethod ("get");
Connection.setconnecttimeout (5000);
FileOutputStream fileoutputstream = null;
InputStream InputStream;
if (connection.getresponsecode () = = 200) {
InputStream = Connection.getinputstream ();

if (InputStream!= null) {
File = GetFile (Httpurl);
FileOutputStream = new FileOutputStream (file);
byte[] buffer = new byte[1024];
int length = 0;

while (length = inputstream.read (buffer))!=-1) {
Fileoutputstream.write (buffer, 0, length);
}
Fileoutputstream.close ();
Fileoutputstream.flush ();
}
Inputstream.close ();
}
Download complete
Installation
INSTALLAPK ();
catch (Malformedurlexception e) {
E.printstacktrace ();
catch (IOException e) {
E.printstacktrace ();
}
}
). Start ();
return file;
}

/**
* Create a file based on the URL sent over
*
*/
Private File getFile (String URL) {
File files = new file (Environment.getexternalstoragedirectory (). Getabsolutefile (), GetFilePath (URL));
return files;
}

/**
* intercepts the filename of the apk after the URL
*
* @param URL
* @return
*/
private string GetFilePath (string url) {
Return url.substring (Url.lastindexof ("/"), Url.length ());
}

/**
* Install APK
*/
private void installapk () {
Intent Intent = new Intent (Intent.action_view);
Intent.setdataandtype (uri.fromfile (file), "application/vnd.android.package-archive");
StartActivity (Intent);
}

Second Kind

Download APK program code
Protected File downLoadFile (String httpurl) {
TODO auto-generated Method Stub
Final String fileName = "updata.apk";
File Tmpfile = new file ("/sdcard/update");
if (!tmpfile.exists ()) {
Tmpfile.mkdir ();
}
Final file File = new file ("/sdcard/update/" + fileName);

try {
URL url = new URL (httpurl);
try {
HttpURLConnection conn = (httpurlconnection) URL
. OpenConnection ();
InputStream is = Conn.getinputstream ();
FileOutputStream fos = new FileOutputStream (file);
byte[] buf = new byte[256];
Conn.connect ();
Double count = 0;
if (Conn.getresponsecode () >= 400) {
Toast.maketext (main.this, "Connection timeout", Toast.length_short)
. Show ();
} else {
while (Count <= 100) {
if (is!= null) {
int numread = Is.read (BUF);
if (numread <= 0) {
Break
} else {
Fos.write (buf, 0, Numread);
}

} else {
Break
}

}
}

Conn.disconnect ();
Fos.close ();
Is.close ();
catch (IOException e) {
TODO auto-generated Catch block

E.printstacktrace ();
}
catch (Malformedurlexception e) {
TODO auto-generated Catch block

E.printstacktrace ();
}

return file;
}
Open APK Program code

private void OpenFile (file file) {
TODO auto-generated Method Stub
LOG.E ("OpenFile", File.getname ());
Intent Intent = new Intent ();
Intent.addflags (Intent.flag_activity_new_task);
Intent.setaction (Android.content.Intent.ACTION_VIEW);
Intent.setdataandtype (uri.fromfile (file),
"Application/vnd.android.package-archive");
StartActivity (Intent);
}

The above method directly calls the Downfile methods, the parameters pass a URL address can be

The third type:

Private String url= "http://----------------------. apk";
private file file;
Private ProgressBar PB;
Private TextView TV;
private int fileSize;
private int downloadfilesize;
private String filename;
Private Handler Handler = new Handler () {
@Override
public void Handlemessage (message msg) {//define a handler that handles the communication between the download thread and the UI
if (! Thread.CurrentThread (). isinterrupted ()) {
Switch (msg.what) {
Case 0:
Pb.setmax (fileSize);
Case 1:
Pb.setprogress (downloadfilesize);
int result = Downloadfilesize * 100/filesize;
Tv.settext (Result + "%");
Break
Case 2:
Finish ();
OpenFile (file);
Break
Case-1:
String error = Msg.getdata (). getString ("error");
Toast.maketext (downloadactivity.this, Error, Toast.length_short). Show ();
Break
}
}
Super.handlemessage (msg);
}
};
New Thread () {
public void Run () {
try {
Down_file (URL, "/sdcard/");
Download files, parameters: first URL, second store path
catch (Clientprotocolexception e) {
TODO auto-generated Catch block
E.printstacktrace ();
catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
}.start ();
public void Down_file (string url, string path) throws IOException {//download function
filename = url.substring (Url.lastindexof ("/") + 1)//Get filename
URL myurl = new URL (URL);
URLConnection conn = Myurl.openconnection ();
Conn.connect ();
InputStream is = Conn.getinputstream ();
This.filesize = Conn.getcontentlength ()//Get file size based on response
if (this.filesize <= 0) throw new RuntimeException ("Unable to learn file size");
if (is = = null) throw new RuntimeException ("stream is null");
FileOutputStream fos = new FileOutputStream (path + filename);//Save data to path + filename

byte buf[] = new byte[1024];
downloadfilesize = 0;
sendmsg (0);
do {
Looping read
int numread = Is.read (BUF);
if (Numread = = 1) {
Break
}
Fos.write (buf, 0, Numread);
Downloadfilesize + = Numread;
Sendmsg (1);//Update progress bar
} while (true);
File = new file (path + filename);
Sendmsg (2);//Notify Download complete
try {
Is.close ();
catch (Exception ex) {
LOG.E ("tag", "Error:" + ex.getmessage (), ex);
}
}

private void sendmsg (int flag) {
msg = new Message ();
Msg.what = Flag;
Handler.sendmessage (msg);
}
Open APK Program code

 private void OpenFile (file file) {
 //TODO auto-generated method stub
 log.e ("OpenFile", File . GetName ());
 intent Intent = new Intent ();
 intent.addflags (Intent.flag_activity_new_task);
 intent.setaction (Android.content.Intent.ACTION_VIEW);
 intent.setdataandtype (uri.fromfile (file),
  "application/vnd.android.package-archive");
 startactivity (Intent);
 }