Question

I created a bitmap and now i want to save that bitmap to a directory somewhere. Can anyone show me how this is done. Thanks

FileInputStream in;
          BufferedInputStream buf;
           try {
                  in = new FileInputStream("/mnt/sdcard/dcim/Camera/2010-11-16_18-57-18_989.jpg");
                  buf = new BufferedInputStream(in);
                  Bitmap _bitmapPreScale = BitmapFactory.decodeStream(buf);
                  int oldWidth = _bitmapPreScale.getWidth();
                  int oldHeight = _bitmapPreScale.getHeight();
                  int newWidth = 2592; 
                  int newHeight = 1936;

                  float scaleWidth = ((float) newWidth) / oldWidth;
                  float scaleHeight = ((float) newHeight) / oldHeight;

                  Matrix matrix = new Matrix();
               // resize the bit map
                  matrix.postScale(scaleWidth, scaleHeight);
                  Bitmap _bitmapScaled = Bitmap.createBitmap(_bitmapPreScale, 0, 0,  oldWidth, oldHeight, matrix, true);

(I want to save _bitmapScaled to a folder on my SD card)

Answer 1

Hi You can write data to bytes and then create a file in sdcard folder with whatever name and extension you want and then write the bytes to that file.
This will save bitmap to sdcard.

ByteArrayOutputStream bytes = new ByteArrayOutputStream();
_bitmapScaled.compress(Bitmap.CompressFormat.JPEG, 40, bytes);

//you can create a new file name "test.jpg" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory()
                        + File.separator + "test.jpg");
f.createNewFile();
//write the bytes in file
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());

// remember close de FileOutput
fo.close();