How to hide bottom bar via adb shell command programmatically with Android 4.2+

To hide the bottom panel from the tablet, I am trying to run this command with the code

 try
    {

       Process proc = Runtime.getRuntime().exec(new String[]{"su","-c","service call activity 42 s16 com.android.systemui"});
       proc.waitFor();
    }
catch(Exception ex)
    {
        Toast.makeText(getApplicationContext(), ex.getMessage(), Toast.LENGTH_LONG).show();
    }

      

        
        
        
      

    

Then it throws an exception

java.io.IOException: An error occurred while executing exec (). Command: [su, -c, service call 42 s16 com.android.systemui] Working directory: null Environment: null

But when I execute a command via adb like "adb shell call service action 42 s16 com.android.systemui" works fine. I mean, he quickly hid the bottom plan. Can anyone help with this issue?