Convert bitmap to base64 string in blackberry

Question

I have an image which needs to be sent to the server. Is there a way to convert a bitmap(jpg) to base64 string in blackberry?

Answer 1

What you request is a bit vague and odd, however I hope this can help:

With the following piece code it's possible to get a JPEG binary data for a Bitmap (note, it is a compressed one, so the size of the data is as small as possible if compare to raw bitmap):

Bitmap bmp = ...; // your bitmap
int quality = 85;
EncodedImage encodedImg = JPEGEncodedImage.encode(bmp, quality);
byte[] data = encodedImg.getData();

Then you can encode it with Base64OutputStream. See the API for sample code on how to encode.

Answer 2

package com.covidien.screens;

import java.io.OutputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.file.FileConnection;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.CDMAInfo;
import net.rim.device.api.system.GPRSInfo;
import net.rim.device.api.system.IDENInfo;
import net.rim.device.api.system.RadioInfo;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.BitmapField;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.container.HorizontalFieldManager;
import net.rim.device.api.ui.container.MainScreen;

import org.kobjects.base64.Base64;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransport;


public final class ImageScreen extends MainScreen
{
    /** The down-scaling ratio applied to the snapshot Bitmap */
    private static final int IMAGE_SCALING = 5;
    private static final String boundary = "31BF3856AD364E35";
    /** The base file name used to store pictures */
    private static String FILE_NAME = System.getProperty("fileconn.dir.photos") + "IMAGE";

    /** The extension of the pictures to be saved */
    private static String EXTENSION = ".png";

    /** A counter for the number of snapshots taken */
    private static int _counter;

    /** A reference to the current screen for listeners */
    private ImageScreen _imageScreen;

    static String imageName=null;
    /**
    * Constructor
    * @param raw A byte array representing an image
    */
    public ImageScreen( final byte[] raw )
    {
        // A reference to this object, to be used in listeners
        _imageScreen = this;

        setTitle("IMAGE");

        // Convert the byte array to a Bitmap image
        Bitmap image = Bitmap.createBitmapFromBytes( raw, 0, -1, IMAGE_SCALING );

        // Create two field managers to center the screen's contents
        HorizontalFieldManager hfm1 = new HorizontalFieldManager( Field.FIELD_HCENTER );
        HorizontalFieldManager hfm2 = new HorizontalFieldManager( Field.FIELD_HCENTER );

        // Create the field that contains the image
        BitmapField imageField = new BitmapField( image );
        hfm1.add( imageField );

        // Create the SAVE button which returns the user to the main camera
        // screen and saves the picture as a file.
        ButtonField photoButton = new ButtonField( "Use" );
        photoButton.setChangeListener( new SaveListener(raw) );
        hfm2.add(photoButton);

        // Create the CANCEL button which returns the user to the main camera
        // screen without saving the picture.
        ButtonField cancelButton = new ButtonField( "Retake" );
        cancelButton.setChangeListener( new CancelListener() );
        hfm2.add(cancelButton);

        // Add the field managers to the screen
        add( hfm1 );
        add( hfm2 );
    }

    /**
    * Handles trackball click events
    * @see net.rim.device.api.ui.Screen#invokeAction(int)
    */
    protected boolean invokeAction(int action)
    {
        boolean handled = super.invokeAction(action);

        if(!handled)
        {
            switch(action)
            {
                case ACTION_INVOKE: // Trackball click.
                {
                    return true;
                }
            }
        }
        return handled;
    }

    /**
    * A listener used for the "Save" button
    */
    private class SaveListener implements FieldChangeListener
    {


        /** A byte array representing an image */
        private byte[] _raw;

        /**
        * Constructor.
        * @param raw A byte array representing an image
        */
        SaveListener(byte[] raw)
        {
            _raw = raw;
        }

        /**
        * Saves the image as a file in the BlackBerry filesystem
        */
        public void fieldChanged(Field field, int context)
        {
            try
            {
                // Create the connection to a file that may or
                // may not exist.
                FileConnection file = (FileConnection)Connector.open( FILE_NAME + _counter + EXTENSION );

                // If the file exists, increment the counter until we find
                // one that hasn't been created yet.
                while( file.exists() )
                {
                    file.close();
                    ++_counter;
                    file = (FileConnection)Connector.open( FILE_NAME + _counter + EXTENSION );
                }

                // We know the file doesn't exist yet, so create it
                file.create();

                // Write the image to the file
                OutputStream out = file.openOutputStream();
                out.write(_raw);

                System.out.println("Boundary  :::::"+boundary);
                //*******************************************************************************************************
                String serviceUrl = "URL/Service.asmx";
                String serviceNamespace = "http://tempuri.org/";
                String soapAction="http://tempuri.org/Upload";
                SoapObject rpc = new SoapObject(serviceNamespace, "Upload");
                SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

                envelope.bodyOut = rpc;
                envelope.dotNet = true;
                envelope.encodingStyle = SoapSerializationEnvelope.XSD;
                rpc.addProperty("contents",Base64.encode(_raw));
                imageName="Image" + _counter + EXTENSION;
                rpc.addProperty("FileName", imageName );
                HttpTransport ht = new HttpTransport(serviceUrl);
                ht.debug = true;
                String result;

                //                String str = null;

                SoapObject soapObject;

                try
                {
                    ht.call(soapAction, envelope);
                    result = (envelope.getResponse()).toString();
                    //                      if((envelope.getResponse()).toString().trim().equals("OK"))
                    //                      {
                        //                         UiApplication.getUiApplication().pushScreen(new DoctorPopup());
                    //                     }
                    //                    if(result.length()==2 ||  result.equalsIgnoreCase("OK"))
                    //                     {
                        //                       UiApplication.getUiApplication().pushScreen(new DoctorPopup());
                    //                     }

                    if(result.length()==2)
                    {
                        UiApplication.getUiApplication().pushScreen(new DoctorPopup());
                    }

                    soapObject = (SoapObject) envelope.getResponse();
                    //                     Dialog.alert("soapObject" + soapObject);
                }
                catch(Exception ex)
                {
                    //if we get an exception we'll just write the msg to the screen.
                    System.out.println(ex.getMessage());
                    result = ex.toString();
                }



                // Close the connections
                out.close();
                file.close();
            }
            catch(Exception e)
            {
                WelcomeScreen.errorDialog("ERROR " + e.getClass() + ":  " +    e.getMessage());
                System.out.println(e.getMessage());
            }

            ++_counter;
        }   
    }

    /**
    * A listener used for the "Cancel" button
    */
    private class CancelListener implements FieldChangeListener
    {
        /**
        * Return to the main camera screen
        */
        public void fieldChanged(Field field, int context)
        {
            UiApplication.getUiApplication().popScreen( _imageScreen );
        }
    }

    public final static boolean isCDMA() {
        return RadioInfo.getNetworkType() == RadioInfo.NETWORK_CDMA;
    }

    public final static boolean isIDEN() {
        return RadioInfo.getNetworkType() == RadioInfo.NETWORK_IDEN;
    }

    public static final String getIMEI() {
        if (ImageScreen.isCDMA()) {
            return ""+CDMAInfo.getESN();
        } else if (ImageScreen.isIDEN()){
            return IDENInfo.imeiToString(IDENInfo.getIMEI());
        } else {
            return GPRSInfo.imeiToString(GPRSInfo.getIMEI());
        }
    }
}

Answer 3

Found this one, much faster conversion of Bitmap to byte[]. Exactly what I needed.

import java.io.*;
import javax.microedition.lcdui.Image;
import net.rim.device.api.compress.ZLibOutputStream;

public class MinimalPNGEncoder
{
  public static Image toImage(int width, int height, byte[] alpha, byte[] red, byte[] green, byte[] blue)
{
    try    
    {
    byte[] png = toPNG(width, height, alpha, red, green, blue);
    return Image.createImage(png, 0, png.length);
    }
    catch (IOException e)
    {
    return null;
    }
}

public static byte[] toPNG(int width, int height, byte[] alpha, byte[] red, byte[] green, byte[] blue) throws IOException
 {
    byte[] signature = new byte[] {(byte) 137, (byte) 80, (byte) 78, (byte) 71, (byte) 13, (byte) 10, (byte) 26, (byte) 10};
    byte[] header = createHeaderChunk(width, height);
    byte[] data = createDataChunk(width, height, alpha, red, green, blue);
    byte[] trailer = createTrailerChunk();

    ByteArrayOutputStream png = new ByteArrayOutputStream(signature.length + header.length + data.length + trailer.length);
    png.write(signature);
    png.write(header);
    png.write(data);
    png.write(trailer);
    return png.toByteArray();
 }

public static byte[] createHeaderChunk(int width, int height) throws IOException
{
    ByteArrayOutputStream baos = new ByteArrayOutputStream(13);
    DataOutputStream chunk = new DataOutputStream(baos);
    chunk.writeInt(width);
    chunk.writeInt(height);
    chunk.writeByte(8); // Bitdepth
    chunk.writeByte(6); // Colortype ARGB
    chunk.writeByte(0); // Compression
    chunk.writeByte(0); // Filter
    chunk.writeByte(0); // Interlace    
    return toChunk("IHDR", baos.toByteArray());
}

public static byte[] createDataChunk(int width, int height, byte[] alpha, byte[] red, byte[] green, byte[] blue) throws IOException
{    
    int source = 0;
    int dest = 0;
    byte[] raw = new byte[4*(width*height) + height];
    for (int y = 0; y < height; y++)
    {
      raw[dest++] = 0; // No filter
      for (int x = 0; x < width; x++)
      {
        raw[dest++] = red[source];
        raw[dest++] = green[source];
        raw[dest++] = blue[source];
        raw[dest++] = alpha[source++];
      }
    }
    return toChunk("IDAT", toZLIB(raw));
}

public static byte[] createTrailerChunk() throws IOException
{
    return toChunk("IEND", new byte[] {});
}

public static byte[] toChunk(String id, byte[] raw) throws IOException
{
    ByteArrayOutputStream baos = new ByteArrayOutputStream(raw.length + 12);
    DataOutputStream chunk = new DataOutputStream(baos);

    chunk.writeInt(raw.length);

    byte[] bid = new byte[4];
    for (int i = 0; i < 4; i++)
    {
        bid[i] = (byte) id.charAt(i);
    }

    chunk.write(bid);

    chunk.write(raw);

    int crc = 0xFFFFFFFF;
    crc = updateCRC(crc, bid);  
    crc = updateCRC(crc, raw);    
    chunk.writeInt(~crc);

    return baos.toByteArray();
}

static int[] crcTable = null;

public static void createCRCTable()
{
    crcTable = new int[256];

    for (int i = 0; i < 256; i++)
    {
      int c = i;
      for (int k = 0; k < 8; k++)
      {
        c = ((c & 1) > 0) ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
      }
      crcTable[i] = c;
    }
}

public static int updateCRC(int crc, byte[] raw)
{
    if (crcTable == null)
    {
      createCRCTable();
    }

    for (int i = 0; i < raw.length; i++)
    {
      crc = crcTable[(crc ^ raw[i]) & 0xFF] ^ (crc >>> 8);      
    }

    return crc;
}

/* This method is called to encode the image data as a zlib
 block as required by the PNG specification. This file comes
 with a minimal ZLIB encoder which uses uncompressed deflate
 blocks (fast, short, easy, but no compression). If you want
 compression, call another encoder (such as JZLib?) here. */
public static byte[] toZLIB(byte[] raw) throws IOException
{
      //used the BB ZLib ...
  ByteArrayOutputStream outBytes = new ByteArrayOutputStream(1024);
  ZLibOutputStream compBytes = new ZLibOutputStream(outBytes, false, 10, 9);
  compBytes.write(raw, 0, raw.length);
  compBytes.close();
  return outBytes.toByteArray();
 //return ZLIB.toZLIB(raw);
 }
}



class ZLIB
{
  static final int BLOCK_SIZE = 32000;

  public static byte[] toZLIB(byte[] raw) throws IOException
{    
    ByteArrayOutputStream baos = new ByteArrayOutputStream(raw.length + 6 + (raw.length / BLOCK_SIZE) * 5);
    DataOutputStream zlib = new DataOutputStream(baos);

    byte tmp = (byte) 8;       
    zlib.writeByte(tmp);                           // CM = 8, CMINFO = 0
    zlib.writeByte((31 - ((tmp << 8) % 31)) % 31); // FCHECK (FDICT/FLEVEL=0)

    int pos = 0;
    while (raw.length - pos > BLOCK_SIZE)
    {
      writeUncompressedDeflateBlock(zlib, false, raw, pos, (char) BLOCK_SIZE);
      pos += BLOCK_SIZE;
    }

    writeUncompressedDeflateBlock(zlib, true, raw, pos, (char) (raw.length - pos));

    // zlib check sum of uncompressed data
    zlib.writeInt(calcADLER32(raw));

    return baos.toByteArray();
 }

 private static void writeUncompressedDeflateBlock(DataOutputStream zlib, boolean last,
                    byte[] raw, int off, char len) throws IOException
 {
    zlib.writeByte((byte)(last ? 1 : 0));         // Final flag, Compression type 0
    zlib.writeByte((byte)(len & 0xFF));           // Length LSB
    zlib.writeByte((byte)((len & 0xFF00) >> 8));  // Length MSB
    zlib.writeByte((byte)(~len & 0xFF));          // Length 1st complement LSB
    zlib.writeByte((byte)((~len & 0xFF00) >> 8)); // Length 1st complement MSB 
    zlib.write(raw,off,len);                      // Data    
 }

 private static int calcADLER32(byte[] raw)
 {
    int s1 = 1;
    int s2 = 0;
    for (int i = 0; i < raw.length; i++)
    {
      int abs = raw[i] >=0 ? raw[i] : (raw[i] + 256);
      s1 = (s1 + abs) % 65521;
      s2 = (s2 + s1) % 65521;      
    }
    return (s2 << 16) + s1;
 }
}

And this is the method that you need to invoke.

public static byte[] toPNG(Bitmap image) throws IOException {

    int imageSize = image.getWidth() * image.getHeight();
    int[] rgbs = new int[imageSize];
    byte[] a, r, g, b;
    int colorToDecode;

    image.getARGB(rgbs, 0, image.getWidth() , 0, 0, image.getWidth(), image.getHeight());

    a = new byte[imageSize];
    r = new byte[imageSize];
    g = new byte[imageSize];
    b = new byte[imageSize];

    for (int i = 0; i < imageSize; i++) {
        colorToDecode = rgbs[i];

        a[i] = (byte) ((colorToDecode & 0xFF000000) >>> 24);
        r[i] = (byte) ((colorToDecode & 0x00FF0000) >>> 16);
        g[i] = (byte) ((colorToDecode & 0x0000FF00) >>> 8);
        b[i] = (byte) ((colorToDecode & 0x000000FF));
    }

    return MinimalPNGEncoder.toPNG(image.getWidth(), image.getHeight(), a, r, g, b);
} 

This is not mine. I am so grateful to Christian Fr�schlin for creating this and letting other developers to use this. This is the link for the terms.

Before i forgot, this one has a limitation. It can converts successfully a bitmap to byte[] which size is less than or equal to 63kb, but if the size exceeds the limit the converted image will be discolored.