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POWhy the Bitmap is always null, from image byte array?
 

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  1. POWhy the Bitmap is always null, from image byte array?
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    <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>
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    1. USgabyoana
    1. USgabyoana
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    1. COOk. You have a problem. But where is the code so we can help you ...
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      1. POWhy the Bitmap is always null, from image byte array?
      1. USAdel Boutros
    2. COI put the code,but i think the byte change the pixel information
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      1. POWhy the Bitmap is always null, from image byte array?
      1. USgabyoana
 

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