Unable to find optional library: org.apache.http.legacy 错误

在目录adt-bundle-windows-x86_64-20140702\sdk\platforms\android-20或者

C:\Users\Administrator\AppData\Local\Android\Sdk\platforms\android-20下

1，创建optional文件夹

2，optional文件夹下创建optional.json

[
{
"name": "org.apache.http.legacy",
"jar": "org.apache.http.legacy.jar",
"manifest": false
}
]

3，网上下载org.apache.http.legacy.jar，http://download.csdn.net/download/u013912642/10148525

放到optional下