Android编译，Error: could not find jdk tools.jar

1. 下载jdk 7 https://download.csdn.net/download/kangweijian/10804091
2. 拷贝到usr/java
3. 解压 sudo tar -zxvf jdk-7u79-linux-x64.tar.gz
4. 修改环境变量 sudo vi /etc/profile

    export JAVA_HOME=/usr/java/jdk1.8.0_111
    export JRE_HOME=${JAVA_HOME}/jre
    export CLASSPATH=.:%{JAVA_HOME}/lib:%{JRE_HOME}/lib
    export PATH=${JAVA_HOME}/bin:$PATH 

5. 执行环境变量 source /etc/profile
6. 查看执行是否成功 java -version