//直接撥號
                Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + "110"));
                mContext.startActivity(intent);

    //跳轉到撥號介面
                Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + "4000788400"));
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                mContext.startActivity(intent);