OutOfMemoryError while decoding and encoding Base64 String into Bitmap

When showing Bitmap in ImageView from a file first decode it with the help of BitmapHelper.decodeFile(picturePath, 200, 200, true) this will return compressed Bitmap so that while encoding this Bitmap you can handle high resolution images as well as heavy size images upto 100 MB of file.

After decoding file set it to your ImageView and to get Base64 String form above compressed image using BitmapHelper class; get Bitmap from your ImageView (i.e. already been compressed) and use ImageBase64.encodeTobase64(bitmap) this will again compress the file and make handle OutOfMemory exception while Encoding a Bitmap.

For decoding first write your Base64String to file in your device memory. Then read Bytes in chunks and decode that ByteArray by this you will have your bitmap in your memory. After this scale down this bitmap using decodeFile() method then you will have compressed Bitmap from Base64String

I have searched various blogs and post and from them I have taken best suitable code and combined them into one to make more reliable. Try below code to make encoding and decoding more faster with meory management.

To decode Base64String

Bitmap bitmap = ImageBase64.decodeBase64(base64ImageStr,MainActivity.this);imageView.setImageBitmap(bitmap);bitmap = null;System.gc();

To encode Bitmap Try this:

imageView.setImageBitmap(BitmapHelper.decodeFile(picturePath, 200, 200, true));Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();              base64ImageStr = ImageBase64.encodeTobase64(bitmap);

Try This code for ImageBase64

public class ImageBase64 {    private ImageBase64() {        super();    }    private static Context appContext;    public static String encodeTobase64(Bitmap image) {         ByteArrayOutputStream baos=new  ByteArrayOutputStream();         image.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();                image.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;    }    public static Bitmap decodeBase64(String input,Context context) {        byte[] decodedByte = Base64.decode(input, 0);        appContext = context;        Boolean isSDPresent = android.os.Environment                .getExternalStorageState().equals(                        android.os.Environment.MEDIA_MOUNTED);        File sdCardDirectory;        if (isSDPresent) {            // yes SD-card is present             sdCardDirectory = new File(                        Environment                                .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),                        "IMG");                if (!sdCardDirectory.exists()) {                    if (!sdCardDirectory.mkdirs()) {                        Log.d("MySnaps", "failed to create directory");                    }                }        } else {            // Sorry            sdCardDirectory = new File(context.getCacheDir(),"");        }        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")                .format(new Date());        Random rand = new Random();        // nextInt is normally exclusive of the top value,        // so add 1 to make it inclusive        int randomNum = rand.nextInt((1000 - 0) + 1) + 0;        String nw = "IMG_" + timeStamp + randomNum+".txt";        File image = new File(sdCardDirectory, nw);        // Encode the file as a PNG image.        FileOutputStream outStream;        try {            outStream = new FileOutputStream(image);            outStream.write(input.getBytes());            outStream.flush();            outStream.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        Log.i("Compress bitmap path", image.getPath());        Bitmap bitmap;        try{        bitmap = BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);        }catch(OutOfMemoryError e){            e.printStackTrace();            InputStream is = context.getResources().openRawResource(R.drawable.default_profile_pic);            bitmap  = BitmapFactory.decodeStream(is);          }catch (Exception e) {            // TODO: handle exception            e.printStackTrace();            bitmap=null;        }        return bitmap;//BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);        //return decodeFile(image);     }    private static Bitmap decodeFile(File f){        try {            //Decode image size            BitmapFactory.Options o = new BitmapFactory.Options();            o.inJustDecodeBounds = true;            BitmapFactory.decodeStream(new FileInputStream(f),null,o);            //The new size we want to scale to            final int REQUIRED_SIZE=70;            //Find the correct scale value. It should be the power of 2.            int scale=1;            while(o.outWidth/scale>=REQUIRED_SIZE && o.outHeight/scale>=REQUIRED_SIZE)                scale*=2;            //Decode with inSampleSize            BitmapFactory.Options o2 = new BitmapFactory.Options();            o2.inSampleSize=scale;            Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, o2);            Boolean isSDPresent = android.os.Environment                    .getExternalStorageState().equals(                            android.os.Environment.MEDIA_MOUNTED);            File sdCardDirectory;            if (isSDPresent) {                // yes SD-card is present                 sdCardDirectory = new File(                            Environment                                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),                            "IMG");                    if (!sdCardDirectory.exists()) {                        if (!sdCardDirectory.mkdirs()) {                            Log.d("MySnaps", "failed to create directory");                        }                    }            } else {                // Sorry                sdCardDirectory = new File(appContext.getCacheDir(),"");            }            String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")                    .format(new Date());            Random rand = new Random();            // nextInt is normally exclusive of the top value,            // so add 1 to make it inclusive            int randomNum = rand.nextInt((1000 - 0) + 1) + 0;            String nw = "IMG_" + timeStamp + randomNum+".png";            File image = new File(sdCardDirectory, nw);            FileOutputStream out = null;            try {                out = new FileOutputStream(image);                bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance                // PNG is a lossless format, the compression factor (100) is ignored            } catch (Exception e) {                e.printStackTrace();            } finally {                try {                    if (out != null) {                        out.close();                    }                } catch (IOException e) {                    e.printStackTrace();                }            }            String pathNew =compressImage(image.getAbsolutePath());            Uri uri = Uri.parse(pathNew);               Bitmap bitmap=null ;            try {                 bitmap     = MediaStore.Images.Media.getBitmap(appContext.getContentResolver(),uri);            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }            return bitmap;        } catch (FileNotFoundException e) {}        return null;    }    public static String compressImage(String imageUri) {        String filePath = imageUri;//getRealPathFromURI(imageUri);        Bitmap scaledBitmap = null;        BitmapFactory.Options options = new BitmapFactory.Options();//      by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If//      you try the use the bitmap here, you will get null.        options.inJustDecodeBounds = true;        Bitmap bmp = BitmapFactory.decodeFile(filePath, options);        int actualHeight = options.outHeight;        int actualWidth = options.outWidth;//      max Height and width values of the compressed image is taken as 816x612        float maxHeight = 816.0f;        float maxWidth = 612.0f;        float imgRatio = actualWidth / actualHeight;        float maxRatio = maxWidth / maxHeight;//      width and height values are set maintaining the aspect ratio of the image        if (actualHeight > maxHeight || actualWidth > maxWidth) {            if (imgRatio < maxRatio) {               imgRatio = maxHeight / actualHeight;                actualWidth = (int) (imgRatio * actualWidth);               actualHeight = (int) maxHeight;             } else if (imgRatio > maxRatio) {                imgRatio = maxWidth / actualWidth;                actualHeight = (int) (imgRatio * actualHeight);                actualWidth = (int) maxWidth;            } else {                actualHeight = (int) maxHeight;                actualWidth = (int) maxWidth;            }        }//      setting inSampleSize value allows to load a scaled down version of the original image        options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);//      inJustDecodeBounds set to false to load the actual bitmap        options.inJustDecodeBounds = false;//      this options allow android to claim the bitmap memory if it runs low on memory        options.inPurgeable = true;        options.inInputShareable = true;        options.inTempStorage = new byte[16 * 1024];        try {//          load the bitmap from its path            bmp = BitmapFactory.decodeFile(filePath, options);        } catch (OutOfMemoryError exception) {            exception.printStackTrace();        }        try {            scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight,Bitmap.Config.ARGB_8888);        } catch (OutOfMemoryError exception) {            exception.printStackTrace();        }        float ratioX = actualWidth / (float) options.outWidth;        float ratioY = actualHeight / (float) options.outHeight;        float middleX = actualWidth / 2.0f;        float middleY = actualHeight / 2.0f;        Matrix scaleMatrix = new Matrix();        scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);        Canvas canvas = new Canvas(scaledBitmap);        canvas.setMatrix(scaleMatrix);        canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));//      check the rotation of the image and display it properly        ExifInterface exif;        try {            exif = new ExifInterface(filePath);            int orientation = exif.getAttributeInt(                    ExifInterface.TAG_ORIENTATION, 0);            Log.d("EXIF", "Exif: " + orientation);            Matrix matrix = new Matrix();            if (orientation == 6) {                matrix.postRotate(90);                Log.d("EXIF", "Exif: " + orientation);            } else if (orientation == 3) {                matrix.postRotate(180);                Log.d("EXIF", "Exif: " + orientation);            } else if (orientation == 8) {                matrix.postRotate(270);                Log.d("EXIF", "Exif: " + orientation);            }            scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,                    scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix,                    true);        } catch (IOException e) {            e.printStackTrace();        }        FileOutputStream out = null;        String filename = getFilename();        try {            out = new FileOutputStream(filename);//          write the compressed bitmap at the destination specified by filename.            scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        return filename;    }    public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {        final int height = options.outHeight;        final int width = options.outWidth;        int inSampleSize = 1;        if (height > reqHeight || width > reqWidth) {            final int heightRatio = Math.round((float) height/ (float) reqHeight);            final int widthRatio = Math.round((float) width / (float) reqWidth);            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;      }       final float totalPixels = width * height;       final float totalReqPixelsCap = reqWidth * reqHeight * 2;       while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {            inSampleSize++;        }        return inSampleSize;    }    public static String getFilename() {        /*File file = new File(Environment.getExternalStorageDirectory().getPath(), "IMG/Images");        if (!file.exists()) {            file.mkdirs();        }        String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg");        */        Boolean isSDPresent = android.os.Environment                .getExternalStorageState().equals(                        android.os.Environment.MEDIA_MOUNTED);        File sdCardDirectory;        if (isSDPresent) {            // yes SD-card is present             sdCardDirectory = new File(                        Environment                                .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath(),                        "IMG/Images");                if (!sdCardDirectory.exists()) {                    if (!sdCardDirectory.mkdirs()) {                        Log.d("MySnaps", "failed to create directory");                    }                }        } else {            // Sorry            sdCardDirectory = new File(appContext.getCacheDir(),"");        }        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")        .format(new Date());        Random rand = new Random();// nextInt is normally exclusive of the top value,// so add 1 to make it inclusive        int randomNum = rand.nextInt((1000 - 0) + 1) + 0;        String nw = "img_" + timeStamp + randomNum+".jpg";        File image = new File(sdCardDirectory, nw);         String uriSting1 = (sdCardDirectory.getAbsolutePath() + "/" + nw);//System.currentTimeMillis() + ".jpg");        return uriSting1;    }}

Add this class to handle heavy images

public class BitmapHelper{    //decodes image and scales it to reduce memory consumption    public static Bitmap decodeFile(String bitmapFile, int requiredWidth, int requiredHeight, boolean quickAndDirty)    {        try        {            //Decode image size            BitmapFactory.Options bitmapSizeOptions = new BitmapFactory.Options();            bitmapSizeOptions.inJustDecodeBounds = true;            BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapSizeOptions);            // load image using inSampleSize adapted to required image size            BitmapFactory.Options bitmapDecodeOptions = new BitmapFactory.Options();            bitmapDecodeOptions.inTempStorage = new byte[16 * 1024];            bitmapDecodeOptions.inSampleSize = computeInSampleSize(bitmapSizeOptions, requiredWidth, requiredHeight, false);            bitmapDecodeOptions.inPurgeable = true;            bitmapDecodeOptions.inDither = !quickAndDirty;            bitmapDecodeOptions.inPreferredConfig = quickAndDirty ? Bitmap.Config.RGB_565 : Bitmap.Config.ARGB_8888;            Bitmap decodedBitmap = BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapDecodeOptions);            // scale bitmap to mathc required size (and keep aspect ratio)            float srcWidth = (float) bitmapDecodeOptions.outWidth;            float srcHeight = (float) bitmapDecodeOptions.outHeight;            float dstWidth = (float) requiredWidth;            float dstHeight = (float) requiredHeight;            float srcAspectRatio = srcWidth / srcHeight;            float dstAspectRatio = dstWidth / dstHeight;            // recycleDecodedBitmap is used to know if we must recycle intermediary 'decodedBitmap'            // (DO NOT recycle it right away: wait for end of bitmap manipulation process to avoid            // java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@416ee7d8            // I do not excatly understand why, but this way it's OK            boolean recycleDecodedBitmap = false;            Bitmap scaledBitmap = decodedBitmap;            if (srcAspectRatio < dstAspectRatio)            {                scaledBitmap = getScaledBitmap(decodedBitmap, (int) dstWidth, (int) (srcHeight * (dstWidth / srcWidth)));                // will recycle recycleDecodedBitmap                recycleDecodedBitmap = true;            }            else if (srcAspectRatio > dstAspectRatio)            {                scaledBitmap = getScaledBitmap(decodedBitmap, (int) (srcWidth * (dstHeight / srcHeight)), (int) dstHeight);                recycleDecodedBitmap = true;            }            // crop image to match required image size            int scaledBitmapWidth = scaledBitmap.getWidth();            int scaledBitmapHeight = scaledBitmap.getHeight();            Bitmap croppedBitmap = scaledBitmap;            if (scaledBitmapWidth > requiredWidth)            {                int xOffset = (scaledBitmapWidth - requiredWidth) / 2;                croppedBitmap = Bitmap.createBitmap(scaledBitmap, xOffset, 0, requiredWidth, requiredHeight);                scaledBitmap.recycle();            }            else if (scaledBitmapHeight > requiredHeight)            {                int yOffset = (scaledBitmapHeight - requiredHeight) / 2;                croppedBitmap = Bitmap.createBitmap(scaledBitmap, 0, yOffset, requiredWidth, requiredHeight);                scaledBitmap.recycle();            }            if (recycleDecodedBitmap)            {                decodedBitmap.recycle();            }            decodedBitmap = null;            scaledBitmap = null;            return croppedBitmap;        }        catch (Exception ex)        {            ex.printStackTrace();        }        return null;    }    /**     * compute powerOf2 or exact scale to be used as {@link BitmapFactory.Options#inSampleSize} value (for subSampling)     *      * @param requiredWidth     * @param requiredHeight     * @param powerOf2     *            weither we want a power of 2 sclae or not     * @return     */    public static int computeInSampleSize(BitmapFactory.Options options, int dstWidth, int dstHeight, boolean powerOf2)    {        int inSampleSize = 1;        // Raw height and width of image        final int srcHeight = options.outHeight;        final int srcWidth = options.outWidth;        if (powerOf2)        {            //Find the correct scale value. It should be the power of 2.            int tmpWidth = srcWidth, tmpHeight = srcHeight;            while (true)            {                if (tmpWidth / 2 < dstWidth || tmpHeight / 2 < dstHeight)                    break;                tmpWidth /= 2;                tmpHeight /= 2;                inSampleSize *= 2;            }        }        else        {            // Calculate ratios of height and width to requested height and width            final int heightRatio = Math.round((float) srcHeight / (float) dstHeight);            final int widthRatio = Math.round((float) srcWidth / (float) dstWidth);            // Choose the smallest ratio as inSampleSize value, this will guarantee            // a final image with both dimensions larger than or equal to the            // requested height and width.            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;        }        return inSampleSize;    }    public static Bitmap drawableToBitmap(Drawable drawable)    {        if (drawable instanceof BitmapDrawable)        {            return ((BitmapDrawable) drawable).getBitmap();        }        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);        Canvas canvas = new Canvas(bitmap);        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());        drawable.draw(canvas);        return bitmap;    }    public static Bitmap getScaledBitmap(Bitmap bitmap, int newWidth, int newHeight)    {        int width = bitmap.getWidth();        int height = bitmap.getHeight();        float scaleWidth = ((float) newWidth) / width;        float scaleHeight = ((float) newHeight) / height;        // CREATE A MATRIX FOR THE MANIPULATION        Matrix matrix = new Matrix();        // RESIZE THE BIT MAP        matrix.postScale(scaleWidth, scaleHeight);        // RECREATE THE NEW BITMAP        Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);        return resizedBitmap;    }}

I would suggest you to:

1. If you receive data from a server using xml-based protocol - use SAX parser instead of DOM.

2. Do not load the whole base64 string in to the memory. Use InputStream to load portion of data in to the byte[] array, decode Base64 from the array and append the result to a cache file via FileOutputStream.

3. Use options.inJustDecodeBounds option to prevent a full-scale bitmap file loading in to memory. You can evaluate the total amount of memory required and make a decision to scale it down, for example. UPD. I noticed you are using it already.

4. Keep in mind object references you are holding and passing trough your methods flow. Strong references prevents memory from to be reclaimed by GC.

Following your code: method decodeBase64 holds String input argument parameter in the stack, byte[] decodedBytereference and return BitmapFactory.decodeStream(new FileInputStream(f), null, o2) at the very end. Holding all these objects in the memory at the same time means big pressure on GC and memory allocation in general. As a simplest solution you can null references just after corresponding objects were used (string and byte array), so GC will be able to free up them.

Try With this pseudo code:Let me know if you have any questions

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);