Android 将Bitmap对象保存为png图片文件

输入：Bitmap对象、保存的路径、保存的文件名

注意路径的最后要带上  '/' 符号

   private void saveBitmap(Bitmap bitmap,String path, String filename) throws IOException
    {
        File file = new File(path + filename);
        if(file.exists()){
            file.delete();
        }
        FileOutputStream out;
        try{
            out = new FileOutputStream(file);
            if(bitmap.compress(Bitmap.CompressFormat.PNG, 100, out))
            {
                out.flush();
                out.close();
            }
        }
        catch (FileNotFoundException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }