title: R cannot be resolved to a variable?
body: <p>I cleaned my project and now I get a "R cannot be resolved to a variable." It was fine before I cleaned it.</p>
  
  <p>I have tried cleaning it again, building the project again, creating a new project and copying all my files over, and I've gone to the Android SDK Manager and installed all the "Android SDK  Build-tools" to Install all the options like the other stackoverflow posts have mentioned: <img src="https://i.stack.imgur.com/h4EB4.png" alt="enter image description here"></p>
  
  <p>Can anyone suggest anything?</p>
  
  <p><img src="https://i.stack.imgur.com/kPjWW.png" alt="enter image description here"></p>
  
  <p>The above picture shows my generated files and lack of an R.java file.</p>
  
  <p><img src="https://i.stack.imgur.com/qbU2M.png" alt="When I check the Problems"></p>
  
  <p>The above picture shows my problems log.</p>