Android zip文件下载和解压实例

下载：
downloadertask.java

package com.johnny.testzipanddownload;

import java.io.bufferedinputstream;
import java.io.bufferedoutputstream;
import java.io.file;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.inputstream;
import java.io.outputstream;
import java.net.malformedurlexception;
import java.net.url;
import java.net.urlconnection;

import android.app.progressdialog;
import android.content.context;
import android.content.dialoginterface;
import android.content.dialoginterface.oncancellistener;
import android.os.asynctask;
import android.util.log;

public class downloadertask extends asynctask<void, integer, long> {
 private final string tag = "downloadertask";
 private url murl;
 private file mfile;
 private progressdialog mdialog;
 private int mprogress = 0;
 private progressreportingoutputstream moutputstream;
 private context mcontext;
 public downloadertask(string url,string out,context context){
  super();
  if(context!=null){
   mdialog = new progressdialog(context);
   mcontext = context;
  }
  else{
   mdialog = null;
  }

  try {
   murl = new url(url);
   string filename = new file(murl.getfile()).getname();
   mfile = new file(out, filename);
   log.d(tag, "out="+out+", name="+filename+",murl.getfile()="+murl.getfile());
  } catch (malformedurlexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  }

 }

 @override
 protected void onpreexecute() {
  // todo auto-generated method stub
  //super.onpreexecute();
  if(mdialog!=null){
   mdialog.settitle("downloading...");
   mdialog.setmessage(mfile.getname());
   mdialog.setprogressstyle(progressdialog.style_horizontal);
   mdialog.setoncancellistener(new oncancellistener() {

    @override
    public void oncancel(dialoginterface dialog) {
     // todo auto-generated method stub
     cancel(true);
    }
   });
   mdialog.show();
  }
 }

 @override
 protected long doinbackground(void... params) {
  // todo auto-generated method stub
  return download();
 }

 @override
 protected void onprogressupdate(integer... values) {
  // todo auto-generated method stub
  //super.onprogressupdate(values);
  if(mdialog==null)
   return;
  if(values.length>1){
   int contentlength = values[1];
   if(contentlength==-1){
    mdialog.setindeterminate(true);
   }
   else{
    mdialog.setmax(contentlength);
   }
  }
  else{
   mdialog.setprogress(values[0].intvalue());
  }
 }

 @override
 protected void onpostexecute(long result) {
  // todo auto-generated method stub
  //super.onpostexecute(result);
  if(mdialog!=null&&mdialog.isshowing()){
   mdialog.dismiss();
  }
  if(iscancelled())
   return;
  ((mainactivity)mcontext).showunzipdialog();
 }

 private long download(){
  urlconnection connection = null;
  int bytescopied = 0;
  try {
   connection = murl.openconnection();
   int length = connection.getcontentlength();
   if(mfile.exists()&&length == mfile.length()){
    log.d(tag, "file "+mfile.getname()+" already exits!!");
    return 0l;
   }
   moutputstream = new progressreportingoutputstream(mfile);
   publishprogress(0,length);
   bytescopied =copy(connection.getinputstream(),moutputstream);
   if(bytescopied!=length&&length!=-1){
    log.e(tag, "download incomplete bytescopied="+bytescopied+", length"+length);
   }
   moutputstream.close();
  } catch (ioexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  }
  return bytescopied;
 }
 private int copy(inputstream input, outputstream output){
  byte[] buffer = new byte[1024*8];
  bufferedinputstream in = new bufferedinputstream(input, 1024*8);
  bufferedoutputstream out  = new bufferedoutputstream(output, 1024*8);
  int count =0,n=0;
  try {
   while((n=in.read(buffer, 0, 1024*8))!=-1){
    out.write(buffer, 0, n);
    count+=n;
   }
   out.flush();
  } catch (ioexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  }finally{
   try {
    out.close();
   } catch (ioexception e) {
    // todo auto-generated catch block
    e.printstacktrace();
   }
   try {
    in.close();
   } catch (ioexception e) {
    // todo auto-generated catch block
    e.printstacktrace();
   }
  }
  return count;
 }
 private final class progressreportingoutputstream extends fileoutputstream{

  public progressreportingoutputstream(file file)
    throws filenotfoundexception {
   super(file);
   // todo auto-generated constructor stub
  }

  @override
  public void write(byte[] buffer, int byteoffset, int bytecount)
    throws ioexception {
   // todo auto-generated method stub
   super.write(buffer, byteoffset, bytecount);
      mprogress += bytecount;
      publishprogress(mprogress);
  }

 }
}

解压：
zipextractortask .java

package com.johnny.testzipanddownload;

import java.io.bufferedinputstream;
import java.io.bufferedoutputstream;
import java.io.file;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.inputstream;
import java.io.outputstream;
import java.util.enumeration;
import java.util.zip.zipentry;
import java.util.zip.zipexception;
import java.util.zip.zipfile;

import android.app.progressdialog;
import android.content.context;
import android.content.dialoginterface;
import android.content.dialoginterface.oncancellistener;
import android.os.asynctask;
import android.util.log;

public class zipextractortask extends asynctask<void, integer, long> {
 private final string tag = "zipextractortask";
 private final file minput;
 private final file moutput;
 private final progressdialog mdialog;
 private int mprogress = 0;
 private final context mcontext;
 private boolean mreplaceall;
 public zipextractortask(string in, string out, context context, boolean replaceall){
  super();
  minput = new file(in);
  moutput = new file(out);
  if(!moutput.exists()){
   if(!moutput.mkdirs()){
    log.e(tag, "failed to make directories:"+moutput.getabsolutepath());
   }
  }
  if(context!=null){
   mdialog = new progressdialog(context);
  }
  else{
   mdialog = null;
  }
  mcontext = context;
  mreplaceall = replaceall;
 }
 @override
 protected long doinbackground(void... params) {
  // todo auto-generated method stub
  return unzip();
 }

 @override
 protected void onpostexecute(long result) {
  // todo auto-generated method stub
  //super.onpostexecute(result);
  if(mdialog!=null&&mdialog.isshowing()){
   mdialog.dismiss();
  }
  if(iscancelled())
   return;
 }
 @override
 protected void onpreexecute() {
  // todo auto-generated method stub
  //super.onpreexecute();
  if(mdialog!=null){
   mdialog.settitle("extracting");
   mdialog.setmessage(minput.getname());
   mdialog.setprogressstyle(progressdialog.style_horizontal);
   mdialog.setoncancellistener(new oncancellistener() {

    @override
    public void oncancel(dialoginterface dialog) {
     // todo auto-generated method stub
     cancel(true);
    }
   });
   mdialog.show();
  }
 }
 @override
 protected void onprogressupdate(integer... values) {
  // todo auto-generated method stub
  //super.onprogressupdate(values);
  if(mdialog==null)
   return;
  if(values.length>1){
   int max=values[1];
   mdialog.setmax(max);
  }
  else
   mdialog.setprogress(values[0].intvalue());
 }
 private long unzip(){
  long extractedsize = 0l;
  enumeration<zipentry> entries;
  zipfile zip = null;
  try {
   zip = new zipfile(minput);
   long uncompressedsize = getoriginalsize(zip);
   publishprogress(0, (int) uncompressedsize);

   entries = (enumeration<zipentry>) zip.entries();
   while(entries.hasmoreelements()){
    zipentry entry = entries.nextelement();
    if(entry.isdirectory()){
     continue;
    }
    file destination = new file(moutput, entry.getname());
    if(!destination.getparentfile().exists()){
     log.e(tag, "make="+destination.getparentfile().getabsolutepath());
     destination.getparentfile().mkdirs();
    }
    if(destination.exists()&&mcontext!=null&&!mreplaceall){

    }
    progressreportingoutputstream outstream = new progressreportingoutputstream(destination);
    extractedsize+=copy(zip.getinputstream(entry),outstream);
    outstream.close();
   }
  } catch (zipexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  } catch (ioexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  }finally{
   try {
    zip.close();
   } catch (ioexception e) {
    // todo auto-generated catch block
    e.printstacktrace();
   }
  }

  return extractedsize;
 }

 private long getoriginalsize(zipfile file){
  enumeration<zipentry> entries = (enumeration<zipentry>) file.entries();
  long originalsize = 0l;
  while(entries.hasmoreelements()){
   zipentry entry = entries.nextelement();
   if(entry.getsize()>=0){
    originalsize+=entry.getsize();
   }
  }
  return originalsize;
 }

 private int copy(inputstream input, outputstream output){
  byte[] buffer = new byte[1024*8];
  bufferedinputstream in = new bufferedinputstream(input, 1024*8);
  bufferedoutputstream out  = new bufferedoutputstream(output, 1024*8);
  int count =0,n=0;
  try {
   while((n=in.read(buffer, 0, 1024*8))!=-1){
    out.write(buffer, 0, n);
    count+=n;
   }
   out.flush();
  } catch (ioexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  }finally{
   try {
    out.close();
   } catch (ioexception e) {
    // todo auto-generated catch block
    e.printstacktrace();
   }
   try {
    in.close();
   } catch (ioexception e) {
    // todo auto-generated catch block
    e.printstacktrace();
   }
  }
  return count;
 }

 private final class progressreportingoutputstream extends fileoutputstream{

  public progressreportingoutputstream(file file)
    throws filenotfoundexception {
   super(file);
   // todo auto-generated constructor stub
  }

  @override
  public void write(byte[] buffer, int byteoffset, int bytecount)
    throws ioexception {
   // todo auto-generated method stub
   super.write(buffer, byteoffset, bytecount);
      mprogress += bytecount;
      publishprogress(mprogress);
  }

 }
}

main activity
mainactivity.java

package com.johnny.testzipanddownload;

import android.os.bundle;
import android.os.environment;
import android.app.activity;
import android.app.alertdialog;
import android.content.dialoginterface;
import android.content.dialoginterface.onclicklistener;
import android.util.log;
import android.view.menu;

public class mainactivity extends activity {

 private final string tag="mainactivity";
 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);

  log.d(tag, "environment.getexternalstoragedirectory()="+environment.getexternalstoragedirectory());
  log.d(tag, "getcachedir().getabsolutepath()="+getcachedir().getabsolutepath());

  showdownloaddialog();
  //dozipextractorwork();
  //dodownloadwork();
 }

 @override
 public boolean oncreateoptionsmenu(menu menu) {
  // inflate the menu; this adds items to the action bar if it is present.
  getmenuinflater().inflate(r.menu.main, menu);
  return true;
 }

 private void showdownloaddialog(){
  new alertdialog.builder(this).settitle("确认")
  .setmessage("是否下载？")
  .setpositivebutton("是", new onclicklistener() {

   @override
   public void onclick(dialoginterface dialog, int which) {
    // todo auto-generated method stub
    log.d(tag, "onclick 1 = "+which);
    dodownloadwork();
   }
  })
  .setnegativebutton("否", new onclicklistener() {

   @override
   public void onclick(dialoginterface dialog, int which) {
    // todo auto-generated method stub
    log.d(tag, "onclick 2 = "+which);
   }
  })
  .show();
 }

 public void showunzipdialog(){
  new alertdialog.builder(this).settitle("确认")
  .setmessage("是否解压？")
  .setpositivebutton("是", new onclicklistener() {

   @override
   public void onclick(dialoginterface dialog, int which) {
    // todo auto-generated method stub
    log.d(tag, "onclick 1 = "+which);
    dozipextractorwork();
   }
  })
  .setnegativebutton("否", new onclicklistener() {

   @override
   public void onclick(dialoginterface dialog, int which) {
    // todo auto-generated method stub
    log.d(tag, "onclick 2 = "+which);
   }
  })
  .show();
 }

 public void dozipextractorwork(){
  //zipextractortask task = new zipextractortask("/storage/usb3/system.zip", "/storage/emulated/legacy/", this, true);
  zipextractortask task = new zipextractortask("/storage/emulated/legacy/testzip.zip", "/storage/emulated/legacy/", this, true);
  task.execute();
 }

 private void dodownloadwork(){
  downloadertask task = new downloadertask("http://192.168.9.155/johnny/testzip.zip", "/storage/emulated/legacy/", this);
  //downloadertask task = new downloadertask("http://192.168.9.155/johnny/test.h264", getcachedir().getabsolutepath()+"/", this);
  task.execute();
 }

}