(Android™) Append Files to Existing Zip w/out Rewriting Entire Zip

Demonstrates how to use the QuickAppend method to append files to an existing .zip archive. This method works by editing the existing .zip -- it does not rewrite or recompress the contents of the existing .zip. It is the fastest way to append additional files to a pre-existing large .zip archive. Note: The QuickAppend method is new and available in the pre-release downloads, or in official releases dated after 6-October-2007.

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);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkZip zip = new CkZip();

    // The NewZip method only initializes the Zip object -- it does
    // not create or write a .zip file.
    boolean success = zip.NewZip("notUsed.zip");
    if (success != true) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    // Add a reference to a file.  This is the file that will
    // be added to a pre-existing .zip archive.  
    // Note: this does not read or compress the file contents --
    // it simply adds a reference to the zip object.
    boolean saveExtraPath = false;
    success = zip.AppendOneFileOrDir("something.dat",saveExtraPath);
    if (success != true) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    // Appends the contents of the zip object to the preExisting.zip
    // zip archive.  preExisting.zip is opened, and the files
    // referenced by this zip object are streamed in, compressed,
    // and appended to the end of the archive.
    success = zip.QuickAppend("preExisting.zip");
    if (success != true) {
        Log.i(TAG, zip.lastErrorText());
        return;
        }

    Log.i(TAG, "Success!");

    // Note: Additional files, directory trees, or in-memory data
    // can be appended by calling AppendOneFileOrDir, AppendFiles,
    // AppendString, AppendData, etc. multiple times.
    // Whatever files and/or in-memory data that are referenced by
    // this zip object will be appended to preExisting.zip when
    // QuickAppend is called

  }

  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."
  }
}