안드로이드 자바소스를 이용한 adb shell이 안됩니다.

public class MainActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    button1 = (Button) findViewById(R.id.button1);
 
    button1.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                String cmd = "dmesg > /sdcard/ABC.txt";
                Process p = Runtime.getRuntime().exec(cmd);
                p.waitFor();
            } catch (IOException e) {
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }