(Android™) Open a Zip Archive

See more Zip Examples

Demonstrates how to open a zip, or an encrypted .zip, or a legacy password-protected .zip.

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);

    CkZip zip = new CkZip();

    // Open a non-encrypted .zip
    boolean success = zip.OpenZip("qa_data/zips/sample.zip");
    if (success != true) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    Log.i(TAG, "Num entries = " + String.valueOf(zip.get_NumEntries()));

    // ...
    // ...

    zip.CloseZip();

    // ----------------------------------------------------------------------------
    // Open an encrypted zip...

    // The two main types of encryption used in ZIP archives are Password-Protected and AES.
    // 

    // ---------------------------------------
    // 1. Legacy Password-Protected Zip
    // 
    // This is the older and less secure method of encrypting ZIP archives. 
    // It provides a basic level of security, but is considered weak by modern standards. 
    // It is vulnerable to various attacks, including known-plaintext attacks and brute force attacks.
    // Although Chilkat allows it, you shouldn't create new zip archives using legacy password-protection.

    // ---------------------------------------
    // 2. AES Encrypted Zip
    // 
    // AES encryption is a more modern and secure method for encrypting ZIP archives. 
    // It provides strong encryption based on the AES algorithm, which is widely regarded as secure. 
    // AES supports different key lengths, typically 128-bit, 192-bit, and 256-bit.

    // When opening an encrypted zip, your application only needs to provide the correct password.
    // The information about the type of encryption and the key length (if AES) is already embedded within the encrypted .zip.

    // Provide the decrypt password because we are opening an existing .zip (decrypting)
    zip.put_DecryptPassword("thePassword");

    success = zip.OpenZip("qa_data/zips/encryptedSamples/ziptest_256.zip");
    if (success != true) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    Log.i(TAG, "Num entries = " + String.valueOf(zip.get_NumEntries()));

    // ...
    // ...

    zip.CloseZip();

  }

  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."
  }
}