(Android™) Extract a Single ZIP Entry While Preserving Its Stored Path

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This example demonstrates how to use the ZipEntry.Extract method to extract a single entry from a ZIP archive.

The example first creates a ZIP archive containing a text file. It then re-opens the ZIP, finds the entry, and extracts it to a base directory.

The Extract method uses the relative path stored within the ZIP entry. Any required subdirectories are created automatically beneath the specified base directory.

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.
    success = zip.AddString("myApp/docs/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;
        }

    // Find the entry by its stored ZIP path.
    CkZipEntry entry = new CkZipEntry();

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

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

    // Extract this single entry to the base directory:
    // 
    //     c:/temp/extracted
    // 
    // Because the entry's stored path is:
    // 
    //     myApp/docs/hello.txt
    // 
    // the file will be extracted to:
    // 
    //     qa_output/extracted/myApp/docs/hello.txt
    // 
    // The required subdirectories are created automatically.
    success = entry.Extract("c:/temp/extracted");
    if (success == false) {
        Log.i(TAG, entry.lastErrorText());
        return;
        }

    zip2.CloseZip();

    Log.i(TAG, "Entry extracted 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."
  }
}