(Android™) Compress Text Feed to Binary

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed binary data.

The purpose is to demonstrate the BeginCompressString, MoreCompressString, and EndCompressString methods.

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

    boolean success;
    CkBinData compressedData = new CkBinData();
    CkByteData compressedBytes = new CkByteData();

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

    CkStringBuilder sbIndex = new CkStringBuilder();

    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) {
            success = compress.BeginCompressString(sbIndex.getAsString(),compressedBytes);
            }
        else {
            success = compress.MoreCompressString(sbIndex.getAsString(),compressedBytes);
            }

        compressedData.AppendBinary(compressedBytes);
        success = compress.MoreCompressString(": This is a line of data to be compressed...\r\n",compressedBytes);
        compressedData.AppendBinary(compressedBytes);
        }

    // Flush any remaining output.
    success = compress.EndCompressString(compressedBytes);
    compressedData.AppendBinary(compressedBytes);

    // Show the compressed data in hex format:
    Log.i(TAG, "The hex encoded compressed text:");
    Log.i(TAG, compressedData.getEncoded("hex"));

    // Now decompress in one call:
    success = compressedData.GetBinary(compressedBytes);
    String originalText = compress.decompressString(compressedBytes);
    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."
  }
}