Run sh command in Android

MyCommandRunner.java

package com.sylvia.gist; 

import android.util.Log; 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class MyCommandRunner {

    private static final String TAG = "MyCommandRunner";

    Boolean logging = true;

    public MyCommandRunner() {
    }

    public MyCommandRunner(Boolean logging) {
        this.logging = logging;
    }

    public String executeCmd(String runtimeCmd, String cmd) {
        Runtime runtime = Runtime.getRuntime();
        Process proc = null;
        OutputStreamWriter osw = null;

        try {
            proc = runtime.exec(runtimeCmd);
            osw = new OutputStreamWriter(proc.getOutputStream());
            osw.write(cmd);
            osw.flush();
            osw.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            if (osw != null) {
                try {
                    osw.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }

        try {
            if(proc != null) {
                proc.waitFor();
            }
        } catch(InterruptedException ex) {
            ex.printStackTrace();
        }

        try {
            String stdOut = readBufRdr(new InputStreamReader(proc.getInputStream()));
            String stdErr = readBufRdr(new InputStreamReader(proc.getErrorStream()));

            if(logging) {
                Log.i(TAG, "sbStdOut = " + stdOut);
                Log.e(TAG, "sbStdErr = " + stdErr);
            }

            return stdOut + stdErr;
        } catch(NullPointerException npe) {
            npe.printStackTrace();
        }

        return "";
    }


    public String runCmd(String cmd) {
        return executeCmd("/system/bin/sh", cmd); // or /bin/sh
    }

    public String runSuCmd(String cmd) {
        return executeCmd("su", cmd);
    }

    private String readBufRdr(InputStreamReader isr) {
        BufferedReader reader = new BufferedReader(isr);
        StringBuilder found = new StringBuilder();
        String curLine = null;
        String sep = System.getProperty("line.separator");
        try {
            while((curLine = reader.readLine()) != null) {
                found.append(curLine);
                found.append(sep);
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            try {
                reader.close();
            } catch(IOException ex) {
                ex.printStackTrace();
            }
        }
        return String.valueOf(found);
    }
}