/** 保存方法 */    public void saveBitmap(Bitmap bm, String picName) {        //获取SD卡的目录，不建议直接写sdcard        File f = new File(Environment.getExternalStorageDirectory().getPath(),picName);        //若存在，则删除        if (f.exists()) {            f.delete();        }        try {            FileOutputStream out = new FileOutputStream(f);            bm.compress(Bitmap.CompressFormat.PNG, 90, out);            out.flush();            out.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }