Image encoding and Decoding using Base64 in android application

Question

In my application I have faced a small issue in encoding and decoding images to String and pass it to web service. After getting the bitmap image, I convert it into byte[] and encode to String value but in Some cases it shows error I don't know why it comes. And one more doubt is Base64 class only supports to convert Bitmap image to String or any other tools available to do the same.

Thanks in advance...

It shows like Out of Memory Exception i thought the String will not hold that much big String value is that true... — Srinivasan, Jul 24 '12 at 08:56

score 12 · Accepted Answer · answered Jul 24 '12 at 09:02

In the case of OutOfMemoryError, below code helps me.

public String BitMapToString(Bitmap bitmap){
        ByteArrayOutputStream baos=new  ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG,100, baos);
        byte [] b=baos.toByteArray();
        String temp=null;
        try{
        System.gc();
        temp=Base64.encodeToString(b, Base64.DEFAULT);
        }catch(Exception e){
            e.printStackTrace();
        }catch(OutOfMemoryError e){
            baos=new  ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.JPEG,50, baos);
            b=baos.toByteArray();
            temp=Base64.encodeToString(b, Base64.DEFAULT);
            Log.e("EWN", "Out of memory error catched");
        }
        return temp;
  }

Basically what i did is : i catch OutofMemoryError and in that catch block i resize it by 50% and then i encode it to string.

@Sri right dude , it will resize the image because i have to encode large image(around 3-5 mb) and need to sent to server. — rajpara, Jul 24 '12 at 09:13

score 2 · Answer 2 · answered Jul 24 '12 at 08:52

2

Try My Below Sample Code Of Project

Bitmap bmp = (Bitmap) data.getExtras().get("data");

        img.setImageBitmap(bmp);
        btnadd.requestFocus();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] b = baos.toByteArray();
        encodedImageString = Base64.encodeToString(b, Base64.DEFAULT);

        byte[] bytarray = Base64.decode(encodedImageString, Base64.DEFAULT);
        Bitmap bmimage = BitmapFactory.decodeByteArray(bytarray, 0,
                bytarray.length);

answered Jul 24 '12 at 08:52

Yash

1,751
13
14

Thanks for your support...i have done the same is there any other tools available to do the same? – Srinivasan Jul 24 '12 at 08:58
1

Try above it's a code snippet from one of my completed project..it will work fine. – Yash Jul 24 '12 at 09:01

Image encoding and Decoding using Base64 in android application

2 Answers2

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