1.安装jdk

BUILD Failed /home/bilal/tmp/ant/build.xml:19: Unable to find a javac compiler; com.sun.tools.javac.Main is not on the classpath. Perhaps JAVA_HOME does not point to the JDK. It is currently set to "/usr/lib/jvm/java-6-openjdk/jre"

@H_403_10@增加一个JAVA_HOME的环境变量，指向jdk的路径C:\Program Files\Java\jdk1.8.0_05 （这里必须是jdk的路径，不能是jre的路径）

@H_403_10@

@H_403_10@2.安装ant

@H_403_10@http://ant.apache.org/bindownload.cgi

@H_403_10@在环境变量path里面指向ant的解压目录即可

@H_403_10@3.在ant release之前需要更新android工程的配置

@H_403_10@android update project -p . -t 1

-t：target id，可以如下获取：
./tools/android list target
Available Android targets:
id: 1 or "android-14"
Name: Android 4.0.1
Type: Platform
API level: 14
Revision: 2
Skins: HVGA,WQVGA432,WVGA800 (default),WXGA720,QVGA,WSVGA,WQVGA400,WXGA800,WVGA854

-n：工程名字
-p：工程路径

sdk.dir is missing.错误就是没有执行这句命令