Android™

Compress and Decompress a String

See more Compression Examples

Demonstrates how to compress and decompress a string. 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;

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

    CkStringBuilder sb = new CkStringBuilder();

    int i;
    for (i = 1; i <= 20; i++) {
        sb.Append("This is the original uncompressed string.\r\n");
        }

    CkCompression compress = new CkCompression();
    compress.put_Algorithm("deflate");
    //  Indicate that the utf-8 byte representation of the string should be compressed.
    compress.put_Charset("utf-8");

    CkByteData compressedBytes = new CkByteData();
    success = compress.CompressString(sb.getAsString(),compressedBytes);

    //  If the compressed data is desired in string format, then get the base64 representation of the bytes.
    compress.put_EncodingMode("base64");
    String compressedBase64 = compress.compressStringENC(sb.getAsString());
    Log.i(TAG, "Compressed Bytes as Base64: " + compressedBase64);

    //  Now decompress...
    String decompressedString = compress.decompressString(compressedBytes);
    Log.i(TAG, "The original string after decompressing from binary compressed data:");
    Log.i(TAG, decompressedString);

    //  To decompress from Base64...
    compress.put_EncodingMode("base64");
    decompressedString = compress.decompressStringENC(compressedBase64);
    Log.i(TAG, "The original string after decompressing from Base64:");
    Log.i(TAG, decompressedString);

  }

  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."
  }
}