Android™

Decode Base64 Image String (GIF, JPG, etc.) and Save to File

I have an XML response that includes a base 64 encoded image string (UPS label). It's a huge string and I need to save it as a gif file on my users pc.

This example shows how to do it..

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;

    CkBinData bd = new CkBinData();

    //  I created an extra-small GIF image for this example..
    success = bd.LoadFile("qa_data/gif/xsmall.gif");
    if (success != true) {
        Log.i(TAG, "Failed to load GIF image file.");
        return;
        }

    //  Show GIF bytes as base64:
    Log.i(TAG, bd.getEncoded("base64"));

    //  This particular GIF in base64 is this:
    //  R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7

    //  Let's begin with an XML string:
    String x = "<abc><def>R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7</def></abc>";

    CkXml xml = new CkXml();
    success = xml.LoadXml(x);

    //  Get the base64 string:
    String gifBase64 = xml.getChildContent("def");

    Log.i(TAG, gifBase64);

    //  Load bd with the base64 decoded bytes.  
    bd.Clear();
    bd.AppendEncoded(gifBase64,"base64");

    //  Save to a GIF file.
    success = bd.WriteFile("qa_output/xsmall.gif");

  }

  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."
  }
}