Why the Bitmap is always null, from image byte array?
<p>I have a problem and can not solve in my application. The application performs operations on images like PNG, <strong>the image is convert in a byte array</strong>, <strong>then a piece from this array of bytes is performed  on bitwise operations</strong>, the problem is the new series of new bitmap format byte is always null. I just do not understand why the new bitmap, from new array byte, is always null and not know how to fix it this bug.</p>

<pre><code>// GetByte method from Image

private byte[] getByteImageData(String filePath) {
        /*
        Bitmap bitmap = BitmapFactory.decodeFile(filePath);
        Bitmap mutable = bitmap.copy(Bitmap.Config.RGB_565, true);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        mutable.compress(Bitmap.CompressFormat.PNG, 100, baos);

    return baos.toByteArray();
        */


        byte[] _imagebytedata = new byte[1024];
        InputStream _input = null;

        try {
            if (filePath != null &amp;&amp; (filePath.length() &gt; 0)) {

                // Create a file for image
                File _fileimage = new File(filePath);

                if (_fileimage.exists()) {

                    // Get the byte from file image
                    _input = new BufferedInputStream(new FileInputStream(
                            _fileimage));
                    _imagebytedata = new byte[(int) _fileimage.length()];
                    _input.read(_imagebytedata, 0, (int) _fileimage.length());
                    _input.close();
                }
            }
        } catch (Exception e) {

        }

// Bitwise operations

private byte[] Text(byte[] imagedata, byte[] textmess, int offset) {


        for (int i = 0; i &lt; textmess.length; ++i) {
            int add = textmess[i];

            for (int bit = 7; bit &gt;= 0; --bit, ++offset) {
                int b = (add &gt;&gt;&gt; bit) &amp; 1;
                imagedata[offset] = (byte) ((imagedata[offset] &amp; 0xFE) |b);
            }
        }
        return imagedata;
    }

//Save image from new byte array

private boolean saveImage(String pathFile,byte[] encodedimage) {

        OutputStream _output = null;
        File _newFileImage = new File(pathFile);
        byte[] _encodedimage = encodedimage;
        //Bitmap _imagebitmap = BitmapFactory.decodeByteArray(encodedimage, 0, encodedimage.length);

        if (_newFileImage.exists()) {
            try {

                _output = new BufferedOutputStream(new FileOutputStream(
                        _newFileImage));
                _output.write(_encodedimage, 0, _encodedimage.length);
                _output.flush();
                _output.close();
                return true;

            } catch (Exception e) {
            }
            ;

        }// _newFileImage.exists()
        return false;
    }


public  boolean encodeTextInFile(String filepath, String text) {

        byte[] _newimagebytedata;
        byte[] _imagebytedata = getByteImageData(filepath);
        byte[] _textbytedata = text.getBytes();
        byte[] _lengthbytedata = byteConversion(text.length());

         Bitmap _bitmapunu = BitmapFactory.decodeByteArray(_imagebytedata, 0, _imagebytedata.length);            
        _newimagebytedata = Text(_imagebytedata, _lengthbytedata, 33);
        Bitmap _bitmapdoi = BitmapFactory.decodeByteArray(_newimagebytedata, 0, _newimagebytedata.length);
        // The value of variable _bitmapdoi is null
        _newimagebytedata = Text(_imagebytedata, _textbytedata, 65);

        return saveImage(filepath, _newimagebytedata);
    }
</code></pre>
