Java android convert image to byte [] without compress and convert byte[] to img

Question

Hi I want to convert a Bitmap to byte[] i did this :

byte[] imageInByte;
Uri uri = data.getData();
bitmap = null;
try {
    bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
} catch (IOException e) {
    e.printStackTrace();
}    
int size = bitmap.getRowBytes() * bitmap.getHeight();
ByteBuffer byteBuffer = ByteBuffer.allocate(size);
bitmap.copyPixelsToBuffer(byteBuffer);
imageInByte = byteBuffer.array();

Next I want to convert this byte[] to Bitmap and I did this :

Bitmap bmp = BitmapFactory.decodeByteArray(imageInByte, 0, imageInByte.length);

And when I what check a bmp.getWidth(); and show in Toast:

Toast.makeText(this,bmp.getWidth()+"",Toast.LENGTH_SHORT).show();

I have nullpointer please help me

@Community Wrong marking. The question was how to prevent a null bitmap. Not what a NullPointerException was. Please undo. — greenapps, Nov 17 '16 at 17:08

score 2 · Accepted Answer · answered Nov 17 '16 at 12:04

2

The reverse of copyPixelsToBuffer() is not decodeByteArray() but copyPixelsFromBuffer().

answered Nov 17 '16 at 12:04

greenapps

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Java android convert image to byte [] without compress and convert byte[] to img

1 Answers1