android保存bitmap到sdcard

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { //判断sdcard是否存在和是否具有读写权限
try{
String sdcard_path = Environment.getExternalStorageDirectory().getCanonicalPath();  //取得sdcard的路径
File dir=new File(sdcard_path+"/xinyuelantu");
if(!dir.exists()){  //创建目录
dir.mkdir();
}
dir=new File(sdcard_path+"/xinyuelantu/browser");
if(!dir.exists()){
dir.mkdir();
}
dir=new File(sdcard_path+"/xinyuelantu/browser/favicon");
if(!dir.exists()){
dir.mkdir();
}

Calendar calendar= Calendar.getInstance(); //获取当前时间作为图标名字
String year=calendar.get(Calendar.YEAR)+"";
String month=calendar.get(Calendar.MONTH)+1+"";
String day=calendar.get(Calendar.DAY_OF_MONTH)+"";
String hour=calendar.get(Calendar.HOUR)+"";
String minute=calendar.get(Calendar.MINUTE)+"";
String second=calendar.get(Calendar.SECOND)+"";
String time=year+month+day+hour+minute+second;

File file=new File(sdcard_path+"/xinyuelantu/browser/favicon/"+time+".jpg");
file.createNewFile();  //创建文件
FileOutputStream fileOutputStream=new FileOutputStream(file);  //获得文件句柄
Bitmap favicon=webview.getFavicon();   //得到当前网站的图标
favicon.compress(Bitmap.CompressFormat.JPEG,100,fileOutputStream);  //保存网站图标，第二个参数取值为0-100，100表示最高质量
fileOutputStream.flush();
fileOutputStream.close();
}
catch(IOException e){}
}