Android ZIP file encryption decompression and progress bar implementation

ZIP file decompression can use the Java Zip Library, but there is no implementation of the encryption file decompression function, here can be implemented using ZIP4J. Detailed can be seen in this article, "Android Zip compressed file encryption and decryption of the perfect solution." The file does not have the ability to implement the decompression progress, here is a simple implementation.

Zip4jsp.java

/** * Unzip file to dest dir with password in thread.            * * @param zipfile * @param dest * @param passwd * @param charset * null or empty is utf-8 * @param Handler * Handler in thread * @param isdeletezipfile * true:delete zip file.false:not. * @throws zipexception */public static void Unzip (Final File zipfile, String dest, String passwd,string charset, final Han Dler Handler, final Boolean isdeletezipfile) throws Zipexception {ZipFile zfile = new ZipFile (ZipFile); if (textutils.isemp Ty (CharSet)) {charset = "UTF-8";} Zfile.setfilenamecharset (CharSet), if (!zfile.isvalidzipfile ()) {throw new zipexception ("Compressed files is not Illegal, May is damaged. "); File DestDir = new file (dest); Unzip Directoryif (destdir.isdirectory () &&!destdir.exists ()) {Destdir.mkdir ();} if (zfile.isencrypted ()) {Zfile.setpassword (Passwd.tochararray ());} Final Progressmonitor progressmonitor = Zfile.getprogressmonitor (); Thread progressthread = new Thread (new Runnable () {@Overridepublic void Run () {bundle bundle = NULL; Message msg = null;try {int percentdone = 0;//long workcompleted=0;//handler.sendemptymessage (progressmonitor.result_ SUCCESS) if (handler = = null) {return;} Handler.sendemptymessage (Compressstatus.start); while (true) {Thread.Sleep (+);p Ercentdone = Progressmonitor.getpercentdone (); bundle = new Bundle (); Bundle.putint (Compresskeys.percent, percentdone); msg = new Message (); msg.what = Compressstatus.handling;msg.setdata (bundle); Handler.sendmessage (msg); if (PercentDone >= 100 ) {break;}} Handler.sendemptymessage (compressstatus.completed);} catch (Interruptedexception e) {bundle = new bundle (); bundle.putstring (Compresskeys.error, E.getmessage ()); msg = new Message (); msg.what = Compressstatus.error;msg.setdata (bundle); Handler.sendmessage (msg); E.printstacktrace ();} Finally{if (isdeletezipfile) {zipfile.deleteonexit ();//zipfile.delete ();}}}); Progressthread.start (); Zfile.setruninthread (true); Zfile.extractall (dest);}

Note:

(1), character set by default UTF-8

(2), unzip the file in the thread, so it needs to Setruninthread (true). Because it is extracted from a thread, it is equivalent to running asynchronously when called, and the calling code goes straight down, needing attention and handling.

(3), the progress bar opens another thread to process, and sends the processed result in the form of handler

(4), using Zipfile.deleteonexit () instead of Zipfile.delete (); Since the use of thread decompression, although the PercentDone obtained from Progressmonitor has reached 100, In fact, the data has not been completely decompressed complete. The exit loop executes the finally delete function, assuming that using zipfile.delete () will delete the file, which may cause the decompression to fail. With the Zipfile.deleteonexit () function, the function is to delete the file when the VM terminates, unlike the Zipfile.delete () delete file. When the app is executing, the VM is always on, so the removal ensures that the decompression may work. Or not to delete the file.

(5), handler code see the following text of the Mainactivity.java.

Compresskeys.java

Package Com.sparkle.compress;public class Compresskeys {public final static String percent= "PERCENT";p ublic final static String error= "ERROR";}

Compressstatus.java

Package Com.sparkle.compress;public class Compressstatus {public final static int start=0;public final static int handling =1;public final static int completed=2;public final static int error=3;}

Mainactivity.java

Private Handler _handler=new Handler () {@Overridepublic void Handlemessage (Message msg) {switch (msg.what) {case Compressstatus.start:{settitle ("START ..."); Case Compressstatus.handling:{bundle bundle=msg.getdata (); int percent=bundle.getint (compresskeys.percent); Settitle (percent+ "%"); Case Compressstatus.error:{bundle Bundle=msg.getdata (); String error=bundle.getstring (Compresskeys.error); _info_textview.settext (error); break;} Case Compressstatus.completed:{settitle ("completed"); byte[] Data=filesp.read (TempFilePath); try {String dataStr=new String (data, "UTF-8"); _info_textview.settext (DATASTR);} catch (Unsupportedencodingexception e) {//TODO auto-generated catch Blocke.printstacktrace ();} break;} Default:break;}};};}

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