Bitmap bmp = Bitmap.createBitmap(480, 800, Config.ARGB_8888);
Canvas canvas = new Canvas(bmp);
canvas.drawBitmap(this.bmp, matrix, paint);
canvas.save(Canvas.ALL_SAVE_FLAG);
canvas.restore();

File file = new File("/sdcard/akai/");
if(!file.exists())
file.mkdirs();
try {
FileOutputStream fos = new FileOutputStream(file.getPath() + "/2.png");
bmp.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
System.out.println("saveBmp is here");
} catch (Exception e) {
e.printStackTrace();
}