Android™

Extract data:image/png;base64 from HTML

See more Base64 Examples

Demonstrates how to extract base64 image data from HTMl and save to files. 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;

    CkStringBuilder sb = new CkStringBuilder();
    CkBinData bd = new CkBinData();
    CkStringBuilder sbFilename = new CkStringBuilder();
    int index = 1;

    success = sb.LoadFile("qa_data/html/oresp body.txt","utf-8");
    // Assume success.
    Log.i(TAG, "length = " + String.valueOf(sb.get_Length()));

    boolean mayHaveMore = true;
    while (mayHaveMore == true) {

        // Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
        String sBase64 = sb.getBetween("data:image/png;base64,","'");

        // If nothing is found, then we'll exit the loop because there are no more.
        mayHaveMore = sb.get_LastMethodSuccess();

        if (sb.get_LastMethodSuccess() == true) {
            // Found something.
            // Load into bd and save.
            success = bd.LoadEncoded(sBase64,"base64");

            sbFilename.SetString("qa_output/png_");
            sbFilename.AppendInt(index);
            sbFilename.Append(".png");

            bd.WriteFile(sbFilename.getAsString());

            // Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
            sb.ReplaceFirst("data:image/png;base64","data:image-png;base64");
            }

        index = index + 1;
        }

    // Restore our replacements..
    int count = sb.Replace("data:image-png;base64","data:image/png;base64");

    Log.i(TAG, "All done.");

  }

  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."
  }
}