bitmat_tof_file.java

   private File saveBitmap(Bitmap bmp, String fileName) {
        if (bmp == null) return null;
        String extStorageDirectory = Environment.getExternalStorageDirectory()
                .toString();
        OutputStream outStream = null;

        File file = new File(extStorageDirectory, fileName + ".png");
        if (file.exists()) {
            file.delete();
            file = new File(extStorageDirectory, fileName + ".png");
            log("file exist " + file + ",Bitmap= " + bmp);
        }
        try {
            outStream = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.PNG, 100, outStream);
            outStream.flush();
            outStream.close();
        } catch (Exception e) {
            e.printStackTrace();
            log("error save " + e.getMessage());
        }
        log("file = " + file);
        return file;

    }