The method of compressing and decompressing zip files with Android _android

This paper illustrates the method of compressing and decompressing the zip file with Android. Share to everyone for your reference. Specifically as follows:

Dirtraversal.java is as follows:

Package com.once;
Import Java.io.File;
Import java.util.ArrayList;
Import java.util.LinkedList; /** * Folder Traversal * @author Once * * */public class Dirtraversal {//no recursion public static linkedlist<file> Li
    Stlinkedfiles (String strpath) {linkedlist<file> list = new linkedlist<file> ();
    File dir = new file (strpath);
    File file[] = Dir.listfiles ();
      for (int i = 0; i < file.length i++) {if (File[i].isdirectory ()) List.add (file[i));
    Else System.out.println (File[i].getabsolutepath ());
    } File tmp;
      while (!list.isempty ()) {tmp = (File) list.removefirst ();
        if (Tmp.isdirectory ()) {file = Tmp.listfiles ();
        if (file = = null) continue;
          for (int i = 0; i < file.length i++) {if (File[i].isdirectory ()) List.add (file[i));
        Else System.out.println (File[i].getabsolutepath ()); } else {System.out.println (Tmp.getabsolutepath ());
  } return list;
  //recursion public static arraylist<file> listfiles (String strpath) {return refreshfilelist (strpath); public static arraylist<file> refreshfilelist (String strpath) {arraylist<file> filelist = new Arrayli
    St<file> ();
    File dir = new file (strpath);
    file[] files = dir.listfiles ();
    if (files = null) return null; for (int i = 0; i < files.length i++) {if (Files[i].isdirectory ()) {refreshfilelist (Files[i].getabsolu
      Tepath ());
      } else {if (Files[i].getname (). toLowerCase (). EndsWith ("Zip")) Filelist.add (files[i));
  } return filelist;

 }
}

The

Ziputils.java is as follows:

Package com.once;
Import java.io.*;
Import java.util.ArrayList;
Import java.util.Collection;
Import java.util.Enumeration;
Import Java.util.zip.ZipEntry;
Import java.util.zip.ZipException;
Import Java.util.zip.ZipFile;
Import Java.util.zip.ZipOutputStream; /** * Java utils Implementation Zip Tool * * @author once/public class Ziputils {private static final int buff_size = 1024 * 10 24; 1M Byte/** * Batch compressed file (clip) * * @param resfilelist List of files (folders) to compress * @param compressed files generated by ZipFile * @throws ioexcept
    Ion throws/public static void Zipfiles (Collection<file> resfilelist, File zipfile) throws IOException { Zipoutputstream zipout = new Zipoutputstream (new Bufferedoutputstream FileOutputStream (ZipFile), BUFF_SIZ
    E));
    for (File resfile:resfilelist) {zipfile (resfile, ZipOut, "");
  } zipout.close ();
   /** * Batch compressed files (clips) * * @param resfilelist List of files (folders) to compress * @param zipfile generated compressed file * @param Comment compressed file comments * @throws IoexceptiOn thrown/public static void Zipfiles (Collection<file> resfilelist, File ZipFile, String comment) when the compression process fails
        Throws IOException {Zipoutputstream zipout = new Zipoutputstream (New Bufferedoutputstream (
    ZipFile), buff_size);
    for (File resfile:resfilelist) {zipfile (resfile, ZipOut, "");
    } zipout.setcomment (comment);
  Zipout.close ();
   /** * Extract a file * * @param zipfile Compressed file * @param folderpath uncompressed target directory * @throws IOException thrown when an error occurred in the decompression process */public static void Upzipfile (File zipfile, String folderpath) throws Zipexception, IOException {File Desdir = n
    EW File (FolderPath);
    if (!desdir.exists ()) {desdir.mkdirs ();
    ZipFile ZF = new ZipFile (ZipFile); for (enumeration<?> entries = Zf.entries (); entries.hasmoreelements ();)
      {ZipEntry entry = (zipentry) entries.nextelement ());
      InputStream in = Zf.getinputstream (entry); String str = folderpath + File.separaTor + entry.getname ();
      str = new String (str.getbytes ("8859_1"), "GB2312");
      File Desfile = new file (str);
        if (!desfile.exists ()) {File Fileparentdir = Desfile.getparentfile ();
        if (!fileparentdir.exists ()) {fileparentdir.mkdirs ();
      } desfile.createnewfile ();
      } outputstream out = new FileOutputStream (desfile);
      byte buffer[] = new Byte[buff_size];
      int reallength;
      while ((Reallength = in.read (buffer)) > 0) {out.write (buffer, 0, reallength);
      } in.close ();
    Out.close (); /** * Extract file name containing incoming text * * @param zipfile Compressed file * @param folderpath destination folder * @param namecontains incoming file horse Match name * @throws zipexception the compressed format is incorrect when thrown * @throws IOException IO error throw/public static arraylist<file> Upzips Electedfile (File zipfile, String folderpath, String namecontains) throws Zipexception, IOException {ARRAYLIST&L T file> filelist = new Arraylist<filE> ();
    File Desdir = new file (FolderPath);
    if (!desdir.exists ()) {Desdir.mkdir ();
    ZipFile ZF = new ZipFile (ZipFile); for (enumeration<?> entries = Zf.entries (); entries.hasmoreelements ();)
      {ZipEntry entry = (zipentry) entries.nextelement ());
        if (Entry.getname (). Contains (Namecontains)) {InputStream in = Zf.getinputstream (entry);
        String str = folderpath + file.separator + entry.getname ();
        str = new String (str.getbytes ("8859_1"), "GB2312");
        Str.getbytes ("GB2312"), "8859_1" Output//Str.getbytes ("8859_1"), "GB2312" input file Desfile = new file (str);
          if (!desfile.exists ()) {File Fileparentdir = Desfile.getparentfile ();
          if (!fileparentdir.exists ()) {fileparentdir.mkdirs ();
        } desfile.createnewfile ();
        } outputstream out = new FileOutputStream (desfile);
        byte buffer[] = new Byte[buff_size];
 int reallength;       while ((Reallength = in.read (buffer)) > 0) {out.write (buffer, 0, reallength);
        } in.close ();
        Out.close ();
      Filelist.add (Desfile);
  } return filelist; /** * Get compressed file list * * @param zipfile Compressed file * @return Compressed file name * @throws zipexception Compressed file format error * Throws IOException throws/public static arraylist<string> Getentriesnames (File zipfile) throws when an error occurs in the decompression process
    tion, IOException {arraylist<string> entrynames = new arraylist<string> ();
    enumeration<?> entries = getentriesenumeration (ZipFile);
      while (Entries.hasmoreelements ()) {ZipEntry entry = ((ZipEntry) entries.nextelement ());
    Entrynames.add (New String (Getentryname (Entry). GetBytes ("GB2312"), "8859_1");
  return entrynames; /** * Get compressed file object to get its properties * * @param zipfile Compressed file * @return return a list of compressed files * @throws zipexception compressed file format incorrectly
throw * @throws IOException io operation is wrong to throw * *  public static enumeration<?> getentriesenumeration (File zipfile) throws Zipexception, IOException {ZipF
    Ile ZF = new ZipFile (ZipFile);
  return Zf.entries ();
   /** * Get a comment on a compressed file object * * @param entry Compressed File object * @return A comment for a compressed file object * @throws unsupportedencodingexception */public static String Getentrycomment (ZipEntry entry) throws Unsupportedencodingexception {return new string (ent
  Ry.getcomment (). GetBytes ("GB2312"), "8859_1");
   /** * Gets the name of the compressed file object * * @param entry Compressed File object * @return The name of the compressed file object * @throws unsupportedencodingexception */public static String Getentryname (ZipEntry entry) throws Unsupportedencodingexception {return new string (entry.
  GetName (). GetBytes ("GB2312"), "8859_1");  /** * Compressed File * * @param resfile files (clips) that need to be compressed * @param zipout Compressed destination file * @param rootpath Compressed file path * @throws FileNotFoundException Throw * @throws When the file is not found IOException when the compression process goes wrong, throw/private static void ZipFile (file resfile,Zipoutputstream zipout, String rootpath) throws FileNotFoundException, IOException {rootpath = RootPath + (root Path.trim (). Length () = 0?
    "": file.separator) + resfile.getname ();
    RootPath = new String (rootpath.getbytes ("8859_1"), "GB2312");
      if (Resfile.isdirectory ()) {file[] filelist = Resfile.listfiles ();
      for (file file:filelist) {zipfile (file, zipout, RootPath);
      } else {byte buffer[] = new Byte[buff_size];
      Bufferedinputstream in = new Bufferedinputstream (new FileInputStream (resfile), buff_size);
      Zipout.putnextentry (New ZipEntry (RootPath));
      int reallength;
      while ((Reallength = in.read (buffer))!=-1) {zipout.write (buffer, 0, reallength);
      } in.close ();
      Zipout.flush ();
    Zipout.closeentry ();

 }
  }
}

I hope this article will help you with your Android program.