(Android™) Convert any File to Base64 (and back)

Demonstrates how to get the contents of any file as a base64 string, and then write it back.

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);

    CkBinData bd = new CkBinData();

    // This example will load a PDF and return it as a base64 string.
    boolean success = bd.LoadFile("qa_data/pdf/helloWorld.pdf");
    if (success != true) {
        Log.i(TAG, "Failed to load file.");
        return;
        }

    String b64Str = bd.getEncoded("base64");
    Log.i(TAG, b64Str);

    // Now write the base64 string back to the binary PDF file:
    CkBinData bd2 = new CkBinData();
    success = bd2.AppendEncoded(b64Str,"base64");
    success = bd2.WriteFile("qa_output/helloWorld.pdf");

  }

  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."
  }
}