public void runSSH(View v){

    String command = "python /home/pi/hello.py";
    String userName = "pi";
    String password = "raspberry";
    String connectionIP = "192.168.137.27";
    SSHManager instance = new SSHManager(userName, password, connectionIP, "");
    String errorMessage = instance.connect();

    if(errorMessage != null)
    {
        System.out.println(errorMessage);
        //fail();
    }

    //String expResult = "FILE_NAMEn";
    // call sendCommand for each command and the output
    //(without prompts) is returned
    String result = instance.sendCommand(command);

    TextView textfield = (TextView)findViewById(R.id.texttest);
    textfield.setText(result);

    // close only after all commands are sent
    instance.close();
    //assertEquals(expResult, result);

}

public class SSHManager {




private static final Logger LOGGER =
        Logger.getLogger(SSHManager.class.getName());
private JSch jschSSHChannel;
private String strUserName;
private String strConnectionIP;
private int intConnectionPort;
private String strPassword;
private Session sesConnection;
private int intTimeOut;

private void doCommonConstructorActions(String userName,
                                        String password, String connectionIP, String knownHostsFileName)
{
    jschSSHChannel = new JSch();

    try
    {
        jschSSHChannel.setKnownHosts(knownHostsFileName);
    }
    catch(JSchException jschX)
    {
        logError(jschX.getMessage());
    }

    strUserName = userName;
    strPassword = password;
    strConnectionIP = connectionIP;
}

public SSHManager(String userName, String password,
                  String connectionIP, String knownHostsFileName)
{
    doCommonConstructorActions(userName, password,
            connectionIP, knownHostsFileName);
    intConnectionPort = 22;
    intTimeOut = 60000;
}

public SSHManager(String userName, String password, String connectionIP,
                  String knownHostsFileName, int connectionPort)
{
    doCommonConstructorActions(userName, password, connectionIP,
            knownHostsFileName);
    intConnectionPort = connectionPort;
    intTimeOut = 60000;
}

public SSHManager(String userName, String password, String connectionIP,
                  String knownHostsFileName, int connectionPort, int timeOutMilliseconds)
{
    doCommonConstructorActions(userName, password, connectionIP,
            knownHostsFileName);
    intConnectionPort = connectionPort;
    intTimeOut = timeOutMilliseconds;
}

public String connect()
{
    String errorMessage = null;

    try
    {
        sesConnection = jschSSHChannel.getSession(strUserName,
                strConnectionIP, intConnectionPort);
        sesConnection.setPassword(strPassword);
        // UNCOMMENT THIS FOR TESTING PURPOSES, BUT DO NOT USE IN PRODUCTION
        //sesConnection.setConfig("StrictHostKeyChecking", "no");
        sesConnection.connect(intTimeOut);
    }
    catch(JSchException jschX)
    {
        errorMessage = jschX.getMessage();
    }

    return errorMessage;
}

private String logError(String errorMessage)
{
    if(errorMessage != null)
    {
        LOGGER.log(Level.SEVERE, "{0}:{1} - {2}",
                new Object[]{strConnectionIP, intConnectionPort, errorMessage});
    }

    return errorMessage;
}

private String logWarning(String warnMessage)
{
    if(warnMessage != null)
    {
        LOGGER.log(Level.WARNING, "{0}:{1} - {2}",
                new Object[]{strConnectionIP, intConnectionPort, warnMessage});
    }

    return warnMessage;
}

public String sendCommand(String command)
{
    StringBuilder outputBuffer = new StringBuilder();

    try
    {
        Channel channel = sesConnection.openChannel("exec");
        ((ChannelExec)channel).setCommand(command);
        InputStream commandOutput = channel.getInputStream();
        channel.connect();
        int readByte = commandOutput.read();

        while(readByte != 0xffffffff)
        {
            outputBuffer.append((char)readByte);
            readByte = commandOutput.read();
        }

        channel.disconnect();
    }
    catch(IOException ioX)
    {
        logWarning(ioX.getMessage());
        return null;
    }
    catch(JSchException jschX)
    {
        logWarning(jschX.getMessage());
        return null;
    }

    return outputBuffer.toString();
}

public void close()
{
    sesConnection.disconnect();
}
}