win7下搭建android环境 几个需要注意的地方
1. 四个下载的工具，jdk+ecilpse+ADT+SDK下载与安装，需要注意的地方：
安装目录不要出现 空格
2. 更新SDK时，
首先 需要在操作系统hosts文件中添加下载ip，节点
# Copyright (c) 1993-2009 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a ‘#‘ symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
# localhost name resolution is handled within DNS itself.
127.0.0.1 localhost
# ::1 localhost
203.208.46.146 www.google.com
74.125.113.121 developer.android.com
203.208.46.146 dl.google.com
203.208.46.146 dl-ssl.google.com
#下面为http代理
110.4.12.178:80
然后 还要在SDK Manage的tools中添加http代理
110.4.12.178：80
3. 如果出现在api包中无system image的情况
那就多试验几个http代理，然后在重启sdk manage程序，并在程序packages中多次reload