executing su command from android activity
<p>i am trying to execute the following method:</p>

<pre><code>public void runAsRoot(String[] cmds) throws Exception {
        Process p = Runtime.getRuntime().exec("su");
        DataOutputStream os = new DataOutputStream(p.getOutputStream());
        InputStream is = p.getInputStream();
        for (String tmpCmd : cmds) {
            os.writeBytes(tmpCmd+"\n");
            int readed = 0;
            byte[] buff = new byte[4096];

            // if cmd requires an output
            // due to the blocking behaviour of read(...)
            boolean cmdRequiresAnOutput = true;
            if (cmdRequiresAnOutput) {
                while( is.available() &lt;= 0) {
                    try { Thread.sleep(200); } catch(Exception ex) {}
                }

                while( is.available() &gt; 0) {
                    readed = is.read(buff);
                    if ( readed &lt;= 0 ) break;
                    String seg = new String(buff,0,readed);
                    Log.i("#&gt;", seg);
                }
            }
        }        
        os.writeBytes("exit\n");
        os.flush();
    }
</code></pre>

<p>i invoked this method using the following input:</p>

<pre><code>String[] cmds = {"/system/bin/sendevent /dev/input/event0 1 107 0 \n", "sleep 1", "/system/bin/sendevent /dev/input/event0 1 107 1 \n"};
                try {
                    runAsRoot(cmds);
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
</code></pre>

<p>but in logcat i receiving following errors:</p>

<pre><code>07-06 15:19:27.007: E/su(6547): sudb - Opening database
07-06 15:19:27.007: E/(6547): Couldn't open database: unable to open database file
07-06 15:19:27.017: E/su(6547): sudb - Could not open database, prompt user
07-06 15:19:47.082: E/su(6547): select failed with 2: No such file or directory
07-06 15:19:47.082: W/su(6547): request rejected (10060-&gt;0 /system/bin/sh)
</code></pre>

<p>Any idea whats the issue?</p>
