Android example source code file (Unzipper.java)

This example Android source code file (Unzipper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

enumeration, file, fileoutputstream, inputstream, io, ioexception, malformedurlexception, net, network, string, unzipper, url, urlconnection, util, zip, zipentry, zipfile

The Unzipper.java Android example source code

/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.clickin2dabeat;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.zip.ZipFile;

public class Unzipper {

  public static String download(String fileUrl) {
    URLConnection cn;
    try {
      fileUrl = (new URL(new URL(fileUrl), fileUrl)).toString();
      URL url = new URL(fileUrl);
      cn = url.openConnection();
      cn.connect();
      InputStream stream = cn.getInputStream();

      File outputDir = new File("/sdcard/c2b/");
      outputDir.mkdirs();
      String filename = fileUrl.substring(fileUrl.lastIndexOf("/") + 1);
      filename = filename.substring(0, filename.indexOf("c2b.zip") + 7);

      File outputFile = new File("/sdcard/c2b/", filename);
      outputFile.createNewFile();
      FileOutputStream out = new FileOutputStream(outputFile);

      byte buf[] = new byte[16384];
      do {
        int numread = stream.read(buf);
        if (numread <= 0) {
          break;
        } else {
          out.write(buf, 0, numread);
        }
      } while (true);

      stream.close();
      out.close();
      return "/sdcard/c2b/" + filename;

    } catch (MalformedURLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      return "";
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      return "";
    }
  }

  public static void unzip(String fileUrl) {
    try {
      String filename = download(fileUrl);
      ZipFile zip = new ZipFile(filename);
      Enumeration<? extends ZipEntry> zippedFiles = zip.entries();
      while (zippedFiles.hasMoreElements()) {
        ZipEntry entry = zippedFiles.nextElement();
        InputStream is = zip.getInputStream(entry);
        String name = entry.getName();
        File outputFile = new File("/sdcard/c2b/" + name);
        String outputPath = outputFile.getCanonicalPath();
        name = outputPath.substring(outputPath.lastIndexOf("/") + 1);
        outputPath = outputPath.substring(0, outputPath.lastIndexOf("/"));
        File outputDir = new File(outputPath);
        outputDir.mkdirs();
        outputFile = new File(outputPath, name);
        outputFile.createNewFile();
        FileOutputStream out = new FileOutputStream(outputFile);

        byte buf[] = new byte[16384];
        do {
          int numread = is.read(buf);
          if (numread <= 0) {
            break;
          } else {
            out.write(buf, 0, numread);
          }
        } while (true);

        is.close();
        out.close();
      }
      File theZipFile = new File(filename);
      theZipFile.delete();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
}