Android Form EditText Show Keyboard onResume

Question

When my Activity is loaded, I wish the txtEdit EditText widget to get focus and show the keyboard.

I tried this in the onResume() but it does not automatically show.

@Override
protected void onResume() {
    InputMethodManager mgr = (InputMethodManager)
         getSystemService(Context.INPUT_METHOD_SERVICE);
    mgr.showSoftInput(txtSearch, InputMethodManager.SHOW_IMPLICIT);