Android™

Iterate Over ZIP Entries Using EntryAt

This example demonstrates how to use the EntryAt method to iterate over all entries contained within a ZIP archive.

The EntryAt method retrieves a ZipEntry object for a given zero-based index.

This is useful for:

• Enumerating all entries in a ZIP archive
• Inspecting filenames, sizes, and timestamps
• Searching or filtering ZIP contents

Suppose the ZIP archive contains:

docs/readme.txt
images/logo.png
data/config.json

The example loops through all ZIP entries and prints information about each entry.

Android™

// 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;

    //  Open an existing ZIP archive.
    CkZip zip = new CkZip();

    success = zip.OpenZip("example.zip");
    if (success == false) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    //  Get the total number of entries in the ZIP archive.
    int numEntries = zip.get_NumEntries();

    Log.i(TAG, "Number of ZIP entries = " + String.valueOf(numEntries));

    //  Create a ZipEntry object that will be reused
    //  for each entry retrieved by EntryAt.
    CkZipEntry entry = new CkZipEntry();

    //  Iterate over all ZIP entries.
    int i = 0;
    while (i < numEntries) {

        //  Retrieve the entry at index i.
        success = zip.EntryAt(i,entry);
        if (success == false) {
            Log.i(TAG, zip.lastErrorText());
            return;
            }

        Log.i(TAG, "Entry " + String.valueOf(i));
        Log.i(TAG, "  FileName: " + entry.fileName());
        Log.i(TAG, "  Uncompressed Length: " + String.valueOf(entry.get_UncompressedLength()));
        Log.i(TAG, "  Compressed Length: " + String.valueOf(entry.get_CompressedLength()));
        Log.i(TAG, "");

        i = i + 1;
        }

    //  Sample output:
    //  
    //  Entry 0
    //    FileName: docs/readme.txt
    //    Uncompressed Length: 1204
    //    Compressed Length: 512
    //  
    //  Entry 1
    //    FileName: images/logo.png
    //    Uncompressed Length: 84211
    //    Compressed Length: 84102
    //  

    zip.CloseZip();

    Log.i(TAG, "Done.");

  }

  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."
  }
}