java - ANDROID: How to gain root access in an Android application? -

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i'm developing first android application, , i'm curious if there "standard" ways executing privileged shell commands. i've been able find 1 way it, executing su, , appending commands stdin of su process.

dataoutputstream pout = new dataoutputstream(p.getoutputstream()); datainputstream pin = new datainputstream(p.getinputstream());  string rv = "";  // su must exit before output can read pout.writebytes(cmd + "\nexit\n"); pout.flush();  p.waitfor();  while (pin.available() > 0)     rv += pin.readline() + "\n";

i've read wrapping privileged (superuser) calls in jni: possible? if so, how 1 go accomplishing it? other that, there other ways of calling privileged instructions java?

as far know, can run command-line commands using root privileges. can use generic class made wraps root access in code: http://muzikant-android.blogspot.com/2011/02/how-to-get-root-access-and-execute.html

all need extend class , override getcommandstoexecute method return commands want execute root.

public abstract class executeasrootbase {    public static boolean canrunrootcommands()    {       boolean retval = false;       process suprocess;        try       {          suprocess = runtime.getruntime().exec("su");           dataoutputstream os = new dataoutputstream(suprocess.getoutputstream());          datainputstream osres = new datainputstream(suprocess.getinputstream());           if (null != os && null != osres)          {             // getting id of current user check if root             os.writebytes("id\n");             os.flush();              string curruid = osres.readline();             boolean exitsu = false;             if (null == curruid)             {                retval = false;                exitsu = false;                log.d("root", "can't root access or denied user");             }             else if (true == curruid.contains("uid=0"))             {                retval = true;                exitsu = true;                log.d("root", "root access granted");             }             else             {                retval = false;                exitsu = true;                log.d("root", "root access rejected: " + curruid);             }              if (exitsu)             {                os.writebytes("exit\n");                os.flush();             }          }       }       catch (exception e)       {          // can't root !          // broken pipe exception on trying write output stream (os) after su failed, meaning device not rooted           retval = false;          log.d("root", "root access rejected [" + e.getclass().getname() + "] : " + e.getmessage());       }        return retval;    }     public final boolean execute()    {       boolean retval = false;        try       {          arraylist<string> commands = getcommandstoexecute();          if (null != commands && commands.size() > 0)          {             process suprocess = runtime.getruntime().exec("su");              dataoutputstream os = new dataoutputstream(suprocess.getoutputstream());              // execute commands require root access             (string currcommand : commands)             {                os.writebytes(currcommand + "\n");                os.flush();             }              os.writebytes("exit\n");             os.flush();              try             {                int suprocessretval = suprocess.waitfor();                if (255 != suprocessretval)                {                   // root access granted                   retval = true;                }                else                {                   // root access denied                   retval = false;                }             }             catch (exception ex)             {                log.e("root", "error executing root action", ex);             }          }       }       catch (ioexception ex)       {          log.w("root", "can't root access", ex);       }       catch (securityexception ex)       {          log.w("root", "can't root access", ex);       }       catch (exception ex)       {          log.w("root", "error executing internal operation", ex);       }        return retval;    }    protected abstract arraylist<string> getcommandstoexecute(); }

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