Android™

Transition from BeginCompressStringENC to FirstChunk/LastChunk

Provides instructions for replacing deprecated BeginCompressStringENC method calls with using FirstChunk/LastChunk properties. 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 sbCompressedBase64 = new CkStringBuilder();

    CkCompression compress = new CkCompression();
    compress.put_Algorithm("deflate");
    compress.put_Charset("utf-8");
    compress.put_EncodingMode("base64");

    CkStringBuilder sbIndex = new CkStringBuilder();

    //  ----------------------------------------------------------------------------------
    //  This is the deprecated way of compressing in chunks using Begin/More/End methods..
    //  ----------------------------------------------------------------------------------
    int i;
    for (i = 0; i <= 24; i++) {
        //  Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
        //  an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
        //  in a subsequent call.
        sbIndex.Clear();
        sbIndex.AppendInt(i);
        if (i == 0) {
            sbCompressedBase64.Append(compress.beginCompressStringENC(sbIndex.getAsString()));
            }
        else {
            sbCompressedBase64.Append(compress.moreCompressStringENC(sbIndex.getAsString()));
            }

        sbCompressedBase64.Append(compress.moreCompressStringENC(": This is a line of data to be compressed...\r\n"));
        }

    //  Flush any remaining output.
    sbCompressedBase64.Append(compress.endCompressStringENC());

    Log.i(TAG, "The base64 encoded compressed text:");
    Log.i(TAG, sbCompressedBase64.getAsString());

    //  Decompress in one call:
    String originalText = compress.decompressStringENC(sbCompressedBase64.getAsString());
    Log.i(TAG, originalText);

    //  ----------------------------------------------------------------------------------
    //  This is new way of compressing in chunks using FirstChunk and LastChunk properties
    //  ----------------------------------------------------------------------------------

    sbCompressedBase64.Clear();

    compress.put_FirstChunk(true);
    compress.put_LastChunk(false);

    CkBinData bdCompressed = new CkBinData();
    CkStringBuilder sbUncompressedChunk = new CkStringBuilder();

    for (i = 0; i <= 24; i++) {
        if (i == 24) {
            compress.put_LastChunk(true);
            }

        sbUncompressedChunk.Clear();
        sbUncompressedChunk.AppendInt(i);
        sbUncompressedChunk.Append(": This is a line of data to be compressed...\r\n");

        compress.CompressSb(sbUncompressedChunk,bdCompressed);

        compress.put_FirstChunk(false);
        }

    Log.i(TAG, "The base64 encoded compressed text:");
    Log.i(TAG, bdCompressed.getEncoded("base64"));

    //  Decompress in one call:
    originalText = compress.decompressStringENC(bdCompressed.getEncoded("base64"));
    Log.i(TAG, originalText);

  }

  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."
  }
}