Android机器是否有Root权限判断

public class RunLinuxCommand {
public boolean isRooted() {
//检测是否ROOT过
DataInputStream stream;
boolean flag=false;
try {
stream = Terminal("ls /data/");
//目录哪都行，不一定要需要ROOT权限的
if(stream.readLine()!=null)flag=true;
//根据是否有返回来判断是否有root权限
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return flag;
}
public DataInputStream Terminal(String command) throws Exception
{
Process process = Runtime.getRuntime().exec("su");
//执行到这，Superuser会跳出来，选择是否允许获取最高权限
OutputStream outstream = process.getOutputStream();
DataOutputStream DOPS = new DataOutputStream(outstream);
InputStream instream = process.getInputStream();
DataInputStream DIPS = new DataInputStream(instream);
String temp = command + "\n";
//加回车
DOPS.writeBytes(temp);
//执行
DOPS.flush();
//刷新，确保都发送到outputstream
DOPS.writeBytes("exit\n");
//退出
DOPS.flush();
process.waitFor();
return DIPS;
}
}