(Android™) Unzip an Entire ZIP Archive While Preserving Directory Structure

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Extract an Entire ZIP Archive While Preserving Directory Structure

This example demonstrates how to use the Unzip method to extract all files and directories from a ZIP archive.

The example shows how the stored ZIP directory structure is recreated beneath the target extraction directory.

Suppose the ZIP archive contains:

aaa/pigs.json bbb/base64Cert.txt bbb/sub1/brasil_cert.pem bbb/sub2/penguins.gif bbb/sub2/starfish.jpg hamlet.xml hello.pdf

After extraction to:

c:/temp/testDir

The following filesystem structure will be created:

c:/temp/testDir/aaa/pigs.json c:/temp/testDir/bbb/base64Cert.txt c:/temp/testDir/bbb/sub1/brasil_cert.pem c:/temp/testDir/bbb/sub2/penguins.gif c:/temp/testDir/bbb/sub2/starfish.jpg c:/temp/testDir/hamlet.xml c:/temp/testDir/hello.pdf

If the target extraction directory does not already exist, it is automatically created.

The Unzip method returns the number of files extracted, or -1 if the extraction fails.

Chilkat Android™ Downloads

Android™ Java Libraries

Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    CkZip zip = new CkZip();

    // Open an existing ZIP archive.
    success = zip.OpenZip("qa_data/zips/sample.zip");
    if (success == false) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    // ------------------------------------------------------------
    // Extract all files to:
    // 
    //     c:/temp/testDir
    // 
    // If the target directory does not already exist,
    // Chilkat will automatically create it.
    // 
    // The Unzip method recreates the stored ZIP directory
    // structure beneath the target directory.
    // 
    int numFilesUnzipped = zip.Unzip("c:/temp/testDir");

    if (numFilesUnzipped < 0) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    Log.i(TAG, "Number of files extracted = " + String.valueOf(numFilesUnzipped));
    Log.i(TAG, "");

    // ------------------------------------------------------------
    // Suppose the ZIP archive contains these entries:
    // 
    //     aaa/pigs.json
    //     bbb/base64Cert.txt
    //     bbb/sub1/brasil_cert.pem
    //     bbb/sub2/penguins.gif
    //     bbb/sub2/starfish.jpg
    //     hamlet.xml
    //     hello.pdf
    // 
    // After extraction, the following files will exist:
    // 
    //     c:/temp/testDir/aaa/pigs.json
    //     c:/temp/testDir/bbb/base64Cert.txt
    //     c:/temp/testDir/bbb/sub1/brasil_cert.pem
    //     c:/temp/testDir/bbb/sub2/penguins.gif
    //     c:/temp/testDir/bbb/sub2/starfish.jpg
    //     c:/temp/testDir/hamlet.xml
    //     c:/temp/testDir/hello.pdf
    // 
    // The ZIP directory structure is preserved during extraction.

    // Close the ZIP archive.
    zip.CloseZip();

    Log.i(TAG, "Unzip completed successfully.");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}