title: Strange error android studio 3.0 fix R.string
body: <p>There is here such a line of code:</p>
  
  <pre><code>this.intentReq.putExtra("android.app.extra.ADD_EXPLANATION",getResources().getString(R.string.mystring));
  </code></pre>
  
  <p>Here <code>(R.string.mystring)) mystring</code> is highlighted in red. How to fix?</p>