Unzip zip file using java.util.zip in android

Unzip zip file using java.util.zip

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Example to unzip /mnt/sdcard/test/test.zip file to /mnt/sdcard/test/unzip/ folder.

Here you see the AndroidUnZipActivity.java in src folder

package com.AndroidUnZip;

 

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;

 

import android.app.Activity;

import android.os.Bundle;

import android.os.Environment;

import android.widget.Toast;

 

public class AndroidUnZipActivity extends Activity {

  

 String extStorageDirectory;

 final String testDir = "/test";

 final String unzipDir = "/unzip/";

 final String orgZipFile = "test.zip";

 String srcFile;

 String targetDir;

  

  /** Called when the activity is first created. */

  @Override

  public void onCreate(Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);

      setContentView(R.layout.main);

     

      CheckExtStorageDirectory();

      unzip();

      Toast.makeText(AndroidUnZipActivity.this,

     "Unzip finished!",

     Toast.LENGTH_LONG).show();

     

 

  }

 

  private void CheckExtStorageDirectory(){

   extStorageDirectory = Environment.getExternalStorageDirectory().toString();

   srcFile = extStorageDirectory + testDir + "/" + orgZipFile;

   targetDir = extStorageDirectory + testDir + unzipDir;

   Toast.makeText(AndroidUnZipActivity.this,

     srcFile + "\n\n" + targetDir,

     Toast.LENGTH_LONG).show(); 

    

  }

 

  private void unzip(){

    

   final int BUFFER_SIZE = 4096;

   BufferedOutputStream bufferedOutputStream = null;

      FileInputStream fileInputStream;

     

      try {

   fileInputStream = new FileInputStream(srcFile);

    

   ZipInputStream zipInputStream = new ZipInputStream(newBufferedInputStream(fileInputStream));

         ZipEntry zipEntry;

        

         while ((zipEntry = zipInputStream.getNextEntry()) != null){

          String zipEntryName = zipEntry.getName();

             File file = new File(targetDir + zipEntryName);

            

             if (file.exists()){

               

             }else{

              if(zipEntry.isDirectory()){

               file.mkdirs();

              }else{

               byte buffer[] = new byte[BUFFER_SIZE];

                

               FileOutputStream fileOutputStream = newFileOutputStream(file);

                     bufferedOutputStream

                      = new BufferedOutputStream(fileOutputStream, BUFFER_SIZE);

                     int count;

                    

                     while ((count = zipInputStream.read(buffer, 0, BUFFER_SIZE)) != -1) {

                             bufferedOutputStream.write(buffer, 0, count);     

                     }

                    

                     bufferedOutputStream.flush();

                     bufferedOutputStream.close();

              }

             }

         }

         zipInputStream.close();

        

  } catch (FileNotFoundException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }catch (IOException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }

  }

 

}

 

 

main.xml in res/layout folder

 


    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
  

 

 

 

 

 To create folder and save unzipped files in sdcard, AndroidManifest.xml have to be modified to add permission of "android.permission.WRITE_EXTERNAL_STORAGE".

 

xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

  package="com.AndroidUnZip"

  android:versionCode="1"

  android:versionName="1.0" >

 

  <uses-sdk android:minSdkVersion="10" />

  <uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

 

  <application

      android:icon="@drawable/ic_launcher"

      android:label="@string/app_name" >

      <activity

          android:name=".AndroidUnZipActivity"

          android:label="@string/app_name" >

          <intent-filter>

              <action android:name="android.intent.action.MAIN" />

 

              <category android:name="android.intent.category.LAUNCHER"/>

          </intent-filter>

      </activity>

  </application>

 

</manifest>

 

 

And finally you see the output.

 

 

 

Thank you.