(Android™) Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

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This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

Note: This example requires Chilkat v11.0.0 or greater.

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// 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;

    // ------------------------------------------------------------
    // First create a sample ZIP archive containing a small text file.

    CkZip zip = new CkZip();

    success = zip.NewZip("c:/temp/sampleText.zip");
    if (success == false) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    // Add a small text file from memory.
    // The text is stored in the ZIP as "hello.txt".
    success = zip.AddString("hello.txt","Hello from a ZIP entry!","utf-8");
    if (success == false) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    // Write the ZIP archive to disk and close it.
    success = zip.WriteZipAndClose();
    if (success == false) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    // ------------------------------------------------------------
    // Now open the ZIP archive we just created.

    CkZip zip2 = new CkZip();

    success = zip2.OpenZip("c:/temp/sampleText.zip");
    if (success == false) {
        Log.i(TAG, zip2.lastErrorText());
        return;
        }

    // Get the text file entry.
    CkZipEntry entry = new CkZipEntry();

    success = zip2.EntryOf("hello.txt",entry);

    if (success == false) {
        Log.i(TAG, "Entry not found.");
        return;
        }

    // Get the compressed ZIP entry data as Base64.
    // 
    // This is the compressed data stored inside the ZIP file,
    // not the uncompressed text "Hello from a ZIP entry!".
    String b64 = entry.copyToBase64();

    Log.i(TAG, "Base64 compressed ZIP entry data:");
    Log.i(TAG, b64);

    zip2.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."
  }
}